Abstract: A temperature sensing element mounted using a guide hole formed in the housing of a motor. The mounting of the temperature sensing element is carried out without additional processing to a coil mounted on a stator, enabling automated mounting of the temperature sensing element. Further, the mounting location of the temperature sensing element is fixed by the location of the guide hole, so that positioning of the temperature sensing element is made easier, and stable temperature sensing is made possible.

Abstract: A brushless commutated torque motor suitable for use with a rotary low frequency sound reproducing apparatus, includes a shaft having a longitudinal axis, a position sensor, a rotor having a plurality of permanently magnetized rotor pole sectors, the rotor being mounted for rotation upon the shaft, and a stator having a plurality of stator poles and stator winding slots disposed alternately therein, the stator slots having stator windings therein driven by individual power amplifiers in response to a control signal, the stator having commutation between stator windings controlled by sensing of rotor angular position by the position sensor, with each rotor pole sector being configured and disposed such that a plurality of stator poles are axially adjacent to each rotor pole sector and each rotor pole sector is angularly separated from adjacent rotor pole sectors by a selective number of stator poles.

Abstract: An arrangement for the determination of the temperature of a direct-current motor. The temperature is determined in an indirect manner from the temperature-dependent armature resistance, with the armature resistance being determined as the quotient of the voltage being applied to and measured at the motor terminals and of the blocking current of the armature, and being set in relation to the respective temperature. The current signal determined from the current flowing within the armature is averaged with adjustable, calculated integration times with the aid of an integrator that can be controlled by a microcontroller. The arrangement, can be used for the indirect determination of the rpm rate (N) and/or variations that are critical or of interest in the rpm rate of the motor. The rpm rate is proportional to the voltage (U.sub.ind) induced within the armature, taking into consideration a motor-typical proportionality constant (.kappa.) according to equation N=.kappa. U.sub.

Abstract: A compact, self contained brushless motor assembly which has a stator fixedly mounted onto a hub. Located about the stator is a rotor with a shaft being connected to the rotor which is conducted through a center through hole formed within the hub. A heat sink is attached to the hub. A controller is mounted onto the heat sink with heat generated by the controller to be dissipated by the heat sink. Rotation of the rotor causes rotation of a shaft which passes through the center through hole with this shaft to be optionally connectable to a planetary gear system. The planetary gear system is to be mounted within an alcove formed within the heat sink.

Abstract: The invention relates to a motor which comprises a drive system which has a stator (10) and a rotor (14), and a control system which controls the drive system and has circuit boards (21), (22), both being housed in a casing (2), wherein the casing (2) has a first conductive pin (25) for flowing a current to input power to the control system and a second conductive pin (26) for flowing a current to output from the control system to respective phases of a coil, and the circuit boards are supported by the first and second conductive pins. And, the invention relates to a method of manufacturing a motor which comprises the steps of using a first die (101) and a second die (102) which are mutually connected with a die split face (104) therebetween and a third die (103) which is inserted in the middle of the first and second dies, inserting and fixing a motor stator, a metallic cylinder and embedding members into a cavity formed by the first, second and third dies, and pouring a molten resin to effect resin molding.

Abstract: An object of the present invention is to provide a bearingless rotary machine which is capable of stably controlling the levitated position of a rotor of an induction motor even if the rotor comprises a squirrel-cage type rotor that is simple in structure and can easily be manufactured.A bearingless rotary machine has a rotor having secondary current paths and a stator spaced from the rotor by a gap. The stator has two kinds of windings for imparting a rotating and a levitating and supporting force to the rotor. The rotary machine has a magnetic field command calculator, magnetic flux distribution detecting means and correcting means for adjusting the detected control magnetic flux distribution to coincide with the magnetic field distribution command.

Abstract: A thermal protection mechanism for electric motors is disclosed. A brush is urged into electrical contact with a commutator by a primary brush spring. A thermally deformable fastener releasably secures the primary brush spring to a brush housing. A secondary brush spring urges the brush away from the commutator with a force less than that of the primary spring. A thermal overload condition within the motor causes the thermally deformable fastener to substantially deform so that the force exerted on the brush by the primary spring is substantially reduced. The force exerted by the secondary spring overcomes the primary spring so that the brush is forcefully disengaged from electrical contact with the commutator, thereby terminating operation of the motor.

Abstract: A commutator motor has at least two supply terminals; a metallic pole tube, and an interference suppressing device, the pole tube being formed as a part of the interference suppressing device.

Abstract: Between a relay terminal of a direct current motor and a contact terminal of an electromagnetic switch, there is provided a fuse which is melted to cut off an electric current upon reaching a predetermined temperature. By properly setting the predetermined temperature at which the fuse melts, it is possible to make the fuse heated to a high temperature and melted in a relatively short time to cut off the electric current in the event of, for example, a continuous operative condition caused due to such a failure as fusion adhesion of a movable contact point with a B-terminal and an M-terminal or fusion adhesion of a contact point mechanism outside a starter, or an overcurrent supply condition caused upon a rotor being locked.

Abstract: An arrangement for measuring the operating temperature of an electromechanical machine utilizes at least one elongate sensor device inserted into a winding slot of the stator core. The sensor device includes a lead attachment portion at which a plurality of relatively large gauge lead wires are attached. The lead wires preferably have a length sufficient to extend to a location outside of the motor housing. The sensor device includes an elongate sensing portion having temperature sensitive conductors. Preferably, the sensing portion is located entirely within the axial extent of the stator core. An elongate transition portion having temperature insensitive conductors provides electrical connection between the lead wires and the temperature sensitive conductors of the sensing portion.

Abstract: A dynamoelectric machine includes a stator having a stator core. A winding is provided on the stator core and the stator core has a stator bore. A rotor including a rotor core is received in the stator bore. A permanent magnet is mounted on the rotor core periphery and a rotor shaft is mounted on the rotor core. Bearing means are provided for supporting the rotor shaft for rotation relative to the stator. A first circuit board having electrical components thereon is used in operating the dynamoelectric machine, and a second circuit board having an electrical component in the form of a sensing device thereon is used in determining the position of the rotor. The first circuit board is constructed for mounting the second circuit board thereon so that the second circuit board projects axially inwardly from the first circuit board and the sensing device is disposed in an axial position overlapping the axial position of the permanent magnet.

Abstract: An electric motor includes a stator assembly having an annular stator core with an inner diameter and an outer diameter. The inner diameter is formed with a plurality of winding slots extending from a first end of the stator core to a second end of the stator core. A plurality of windings are disposed within the winding slots beginning with a first slots. The windings are coupled into at least one winding group associated with at least a first phase, and each winding has a first winding end and a second winding end extending from the first end and the second end, respectively, of the stator core. At least one thermal fuse is disposed in thermal contact with the first winding end and substantially adjacent to the first winding portion.

Abstract: Systems and apparatus for integrating an air switch and a power cord into an electric motor, and methods for assembling an electric motor including an integral air switch and an integral power cord, are described. In one embodiment, an air switch and a power cord are incorporated into an electric motor. No additional removable cover is required for the switch and cord. To eliminate the motor centrifugal switch, an air switch is provided to control energization and de-energization of the motor windings. The air switch includes a snap action switch to cut-out the start winding used for ensuring that the rotor has sufficient starting torque.

Abstract: A starter comprises a thermostat for detecting increases in the temperature of the starter and interrupting the energizing of the starter, the thermostat being disposed in the vicinity of brushes and secured to a rear bracket. A holder for restricting relative displacement between the rear bracket and the thermostat and a connector electrically connected to the thermostat having an O-ring on the outer circumference thereof may also be provided. The thermostat and the connector may be integrated or disposed independently and connected by lead wires. The thermostat may be disposed on the perimeter of the brushes with its longitudinal direction parallel to the axial direction of an armature or between the brushes and the rear bracket with its longitudinal direction perpendicular to the axial direction of the armature.

Abstract: An electromechanical machine includes a stator fixed with respect to a housing structure and a rotor fixed with respect to a driven shaft. The stator includes a magnetically permeable core having a plurality of parallel winding slots containing conductive windings. Coilheads are located at opposite axial ends of the magnetically permeable core where the windings turn to extend down a parallel winding slot. The motor is equipped with electrostatic shield arrangements in the winding slots and coilheads to reduce capacitive coupling between the stator and rotor during operation.

Abstract: A brushless motor which includes an arrangement to prevent dielectric breakdown of electronic parts mounted on a control board. The breakdown is caused by a heat sink which becomes electrostatically charged. The potential at the heat sink, which contacts switching devices (for instance, FETS) of the brushless motor, is equalized with the potential at one side of a source line for a drive circuit formed on the control board that includes the switching device. As a result, when the heat sink becomes electrostatically charged, the charge at the heat sink can be discharged to the source line, thereby eliminating the above problem.

Abstract: An integral brushless DC motor and drive package is disclosed that includes the brushless DC motor and drive circuitry supported by one of the motor end caps. The drive circuitry includes power electronic devices for converting input power to pulsed power for the motor. The power switching components extend from a circuit board and are received within recesses of the end cap. The switching components are electrically insulated from the end cap, but are thermally conductive to the end cap within the recesses to dissipate heat during operation. The switching components are preferably disposed in radially equally spaced positions on the circuit board to provide even heat loading to the end cap.

Abstract: To reduce the number of parts composing a control circuit and to reduce an area occupied by a printed circuit board on which the parts are to be mounted, in an axial flow fan motor in which a shaft is rotatably mounted by bearings and an impeller is mounted on the shaft, the control circuit is in the form of an arcuate shape having an area corresponding to 30% to 60% of an total area of the boss portion and is installed into a printed circuit board having a diameter smaller than that of the boss portion. Also, by utilizing the functions installed into the integrated circuit of the control circuit, the parts provided on the circuit board may be dispensed with. As a result, a space which corresponds to that of the printed circuit board is generated in an interior of a casing to thereby enhance the cooling performance and to reduce the number of the parts and the manufacture steps.

Abstract: A method and apparatus for real-time electric motor diagnostics and condition monitoring. While the motor is energized, dynamic operating parameters are determined and a notification signed is generated if predetermined criterion are satisfied. The diagnostic apparatus is integrated with the motor and includes a set of sensors, a processing unit, a memory and an output interface for communicating alarms, warnings and calculated operating parameter values or the like to a display device and to an external supervisor having wireless paging capability to alert a remote operator or maintenance personnel. In a normal operating mode, the processing unit calculates a general class of derived motor operating parameters such as over-temperature, over-voltage, over-current, excessive vibration, and phase imbalance.

Abstract: In a starter, a power supply terminal connected to a solenoid coil of a magnet switch and connectable to a starter external circuit is provided on an end cover. The power supply terminal includes a terminal metal member, a bimetal which interrupts electric conduction between the solenoid coil and the terminal metal member at the time of temperature rise above a predetermined temperature, and a casing contacting a foot part of the terminal metal member and encasing the bimetal therein. The bimetal responds to each of the excessive heating of the terminal metal member and excessive energization current to interrupt the conduction. In case of a single axis-type starter, the power supply terminal is provided on a recess so that the terminal metal member does not extend axially beyond the rear end face of the end cover.

Abstract: An electric motor input circuit including a leadless capacitor which reliably and efficiently provides the highest possible level of RFI suppression and the greatest reduction in conducted voltage transients. The assembly includes a capacitor having no solid lead wires and no epoxy coating which is snap-fit into the motor power circuit so that one of the capacitor plates is in pressing engagement with one of the input terminals and the other of the capacitor plates is in pressing engagement with a conducting tab. The conducting tab is formed on the other of the input terminals, and the capacitor is, therefore, connected between the terminals without the use of solid capacitor leads.

Abstract: A dynamoelectric machine constructed for speed and accuracy of manufacturing has a stator core constructed of 90.degree. symmetrical stator laminations and the windings have differing numbers of poles which overlap in slots of the stator core are wound of the core formed by the laminations in unique fashion. The rotor bars of the machine are skewed to optimize performance of the machine when in the form of a single phase induction motor. Magnet wire leads of the windings are connected directly to terminals on a plug and terminal assembly which is formed for positive location on an end frame of the machine without welding or other fastening to the end frame. The end frames of the machine and stator laminations forming the stator core are formed so as to increase the precision of the final position of the stator relative to the rotor assembly of the dynamoelectric machine. The end frames are constructed for grounding without the use of fasteners or wire.

Abstract: Methods of manufacturing an apparatus adapted to be connected to a power source, the apparatus for driving a rotatable component. A motor has a stationary assembly and a rotatable assembly in magnetic coupling relation to the stationary assembly, the rotatable assembly in driving relation to the rotatable component, the stationary assembly including windings adapted to be energized by the power source to produce an electromagnetic field for rotating the rotatable assembly, the windings having a maximum desired operating temperature and a predetermined minimum desired temperature rise. A heater is in heat exchange relationship to an outer surface of the windings, the heater adapted to be connected to the power source at least when the motor windings are not energized to generate heat transferred to the windings to increase the temperature of the windings. An optional thermostat may be connected in series between the heater and the power source.

Abstract: A brushless dc external-rotor motor having a hollow cylindrical heat sink fastened to the peripheral border region of a printed circuit board. Power semiconductors are arranged on an inner cylinder wall of the heat sink in a heat conducting manner, and the cylinder wall forms part of the peripheral border of the stator flange in the motor. A connector fastens Hall generator(s) on the circuit board and provides the electrical connection with the circuit board. The connector can be soldered along with all other electronic components in a joint soldering process, wherein a subassembly of a preassembled circuit board and a heat sink fastened to its periphery and carrying the power semiconductors passes through a solder bath to solder all components in a single soldering process. It is subsequently necessary only to plug the Hall generator or generators onto the connector or connectors soldered onto the circuit board.

Abstract: A starter motor has an armature, a commutator and brushes slidably supported by a brush holder, and a magnet switch controls motor operation. A switch supporting member supports the magnet switch and an energization control unit accommodating a bimetal switch having a contact therein. The energization control unit opens its inner contact to shut off the current carried to a magnet switch coil when the temperature of heat transferred via switch supporting member, i.e., the heat of the coil transferred via brushes and a switch yoke, reaches a predetermined temperature, thereby stopping motor operation.

Abstract: An overload holder for mounting a thermal overload protector to the compressor motor of a hermetically sealed compressor unit. The holder includes an insulative plastic circumferential wall with openings at the top and bottom thereof, an arm extending outwardly therefrom, and a lip extending inwardly therefrom. Electrical leads extend from the overload protector, through the overload holder, and connect to the motor. The lip engages the overload protector so that the overload protector is held in place in the holder. The holder attaches to the stator by engaging the lacing about the stator windings at the outwardly extending arm and the exposed electrical leads, which are generally opposite the outwardly extending arm.

Abstract: A method for providing thermal protection for forced air cooled power electronic semiconductors without direct measurement of semiconductor temperature, the semiconductors being mounted on a heat sink over which cooling air is blown includes the steps of computing the cooling air mass flow rate, creating an electronic model of the semiconductor/heat sink combination and estimating the semiconductor junction temperature from the mass flow rate and model. The cooling mass flow rate is determined by measuring the temperature of the cooling air prior to passage over the heat sink, measuring atmospheric pressure of the cooling air, determining the volumetric air flow rate of the cooling air and computing, from the cooling air temperature, pressure and volumetric flow rate, the cooling air mass flow rate. Power dissipation in the semiconductors is then computed and heat sink and semiconductor temperatures are estimated from power dissipation and cooling air mass flow rate.

Abstract: An insulating plate for a vehicle alternator has a semi-circular body with insulating bushes formed at both ends of the body and an extension formed at one end of the body to support the bottom of a terminal plate of the alternator. A pair of vertical walls are formed on both sides of the extension to tightly grasp the sides of terminal plate. The body of the insulated plate also has at least one protective guide hole to guide the phase leads which extend from the stator to the rectifier.

Abstract: In order to monitor the temperature of an electric generator, the temperatures of a plurality of rods of a stator winding of the generator being cooled by a coolant, preferably a water-cooled stator winding, are detected. In order to detect a temperature deviation in each winding rod, a measured actual or real temperature value of each winding rod is compared with a reference value for the winding rod. The reference value is derived from parameters previously determined for the winding rod by reference measurement and from presently or currently detected, operation-relevant parameters of the generator. The parameters for each winding rod are derived from a temperature of the winding rod detected during the reference measurement and from a number of functions that corresponds to the number of parameters. The functions are derived from operation-relevant parameters detected during the reference measurement in different states of operation of the generator.

Abstract: An electromagnetic clutch for a compressor in an air conditioning apparatus for an automobile. A temperature fuse unit 13 is arranged in an electric circuit for an electromagnetic coil of the clutch for opening the circuit when a temperature increase is generated due to an occurrence of seizing. The temperature fuse unit 13 is arranged in a coil housing 4 at a location adjacent a frictional surface 2a of a rotor of the clutch and an inner sleeve portion 4a of the coil housing 4. During normal operation of the clutch, heat around the electromagnetic coil is transmitted to the coil housing of an increased heat conductivity, made of a magnetizing metal materials, thereby preventing the temperature around the temperature fuse 13 from being increased.

Abstract: A mounting clip for securing a motor protector to the stator of an electric motor is described. In one embodiment, the mounting clip includes a protector holding region formed by a base portion, a back portion, arm portions, and a retaining member. The protector is positioned within the protector holding region. The base of the mounting clip seats upon the uppermost, or outermost, lamination of the lamination stack forming the motor stator and includes one or more fingers sized for insertion between adjacent stator winding gaps. The mounting clip is maintained in position by the friction fit between the clip fingers, the stator windings and insulation.

Abstract: A temperature monitoring circuit comprises a thermistor which is connected with a power supply rail by means of a transistor. The transistor is pulsed to connect the thermistor intermittently in circuit with the power supply. The mean power drawn by the thermistor from the power supply is reduced, causing less drain on the power supply.

Abstract: A method of operating a switched reluctance machine is disclosed, which provides electrical current overload protection. The stator winding motor drive employs a high-side semiconductor switch, along with a corresponding high-side gate driver (which incorporates a bootstrap-type drive circuit). A low-side semiconductor switch, and a corresponding gate driver is also used to thereby define a two-switch per phase topology. The high-side MOSFET switch gate driver must have rising, and falling edges from an associated controller in order for the bootstrap drive power supply portion to function. A drive controller is configured so that it will generate these rising, and falling edges only when the motor is moving, as indicated by a speed signal. Therefore, if the motor stops moving, due to an unexpected load, such as a seized pump connected to an output shaft thereof, the speed signal will so indicate the stall, wherein the controller will not generate a signal having rising and falling edges.

Abstract: A motor vehicle screen wiper drive unit in the form of a motorised reduction gear unit has a body which is provided with a removable brush carrier plate, together with at least one electrical component connected to the brush carrier plate through a flexible electrical conductor, this component, or these components, being part of the power supply circuit for the drive unit. The brush carrier plate includes means for retaining the said component or components temporarily during fitting of the carrier plate in the body of the unit. The electrical component is arranged for sliding movement with respect to the carrier plate, into cooperation with retaining means formed in the body of the unit for retaining the component. A method of assembly of a brush carrier plate with at least one associated electrical component, in the body of such a drive unit, is also described.

Abstract: A miniature motor comprising a case having a positive temperature coefficient resistor incorporated therein and a permanent magnet fixedly fitted thereto, a rotor comprising an armature and a commutator, and a case cap having a pair of power-feeding brushes and a pair of input terminals electrically connected to the brushes, in which a lanced and raised lug or lanced and raised projections are provided at the tip of a retaining member made of an electrically conductive material, a retaining part is formed by bending a part or the whole of the tip of the retaining member toward the side of the lanced and raised lug or lanced and raised projections, the size of a gap between a projection or a lanced and raised lug provided on any one surface of a pair of input terminals, and the retaining part in free state and the lanced and raised lug is made smaller than the thickness of the positive temperature coefficient resistor being inserted therebetween so that the positive temperature coefficient resistor can be inse

Abstract: An apparatus adapted to be connected to a power source, the apparatus for driving a rotatable component. A motor has a stationary assembly and a rotatable assembly in magnetic coupling relation to the stationary assembly, the rotatable assembly in driving relation to the rotatable component, the stationary assembly including windings adapted to be energized by the power source to produce an electromagnetic field for rotating the rotatable assembly, the windings having a maximum desired operating temperature and a predetermined minimum desired temperature rise. A heater is in heat exchange relationship to an outer surface of the windings, the heater adapted to be connected to the power source at least when the motor windings are not energized to generate heat transferred to the windings to increase the temperature of the windings. An optional thermostat may be connected in series between the heater and the power source.

Abstract: In a motor, there are provided, integral with a motor cover covering the opening of a motor case: arm holding parts for holding brush arms; a PTC holding part for holding a PTC such that the side thereof is in contact with the brush arm; a first hole into which a connecting wire body, which serves as an external circuit terminal, is inserted so as to come into contact with a connecting part of the brush arm, the connecting part of the brush arm touching a hypothetical curved surface extending from the inner wall of the first hole; and a second hole into which a connecting wire body, which serves as an external circuit terminal, is inserted so as to come into contact with the side of the PTC, the side of the PTC touching a hypothetical curved surface extending from the inner wall of the second hole.

Abstract: The present invention relates to a resistor device for controlling a rotational speed of a motor which has no directional property and provides a convenient setting. A resistance unit is positioned which includes at least four connecting points connected to connecting terminals at an upper predetermined position of a housing, and a heat sink having at least four supporting legs is provided to form passing paths open in all directions on the housing. Also, the resistance unit is adhered on the heat sink through an insulating layer, a second heat sink corresponding to the first heat sink is adhered on the resistance unit through the insulating layer, and short-circuit means having a soldered portion to be fused at a predetermined temperature upon an overloading of the motor is provided between the resistance unit and any one terminal.

Abstract: A resistor device for controlling a rotational speed of a resistance unit and an open-circuit means. A receiving recess is provided to any one side surface of a heat sink vertically affixed to a top surface plate of a housing. A resistance unit, which is protected by a film and made of metal material forming a resistor circuit for gradually controlling the rotational speed of a motor, is received within the recess in the heat sink and connected to a terminal. An open-circuit means, having a soldered portion which is fused at a predetermined temperature upon an overload of the motor, is provided at a predetermined distance between the resistance unit and a terminal.

Abstract: A detection and alarm circuit for protection of electronic components includes a fan motor current sensing resistor for producing a pulse that is amplified and introduced to a frequency-to-voltage converter for generating a filtered and processed voltage level for application to a voltage comparator. A reference voltage circuit supplies a voltage level to the comparator for matching with the filtered and processed voltage level and depending on the mismatch, an output signal is introduced to a transistor switch for operating an alert alarm device.

Abstract: A miniature motor including a case formed into a bottomed hollow tubular shape and having a permanent magnet fixedly fitted to the inner circumferential surface thereof, a rotor formed of an armature and a commutator, and a case cover engaged with an open end of the case and having brushes making sliding contact with the commutator and input terminals electrically connected to the brushes, in which each of brush arms is formed into an essentially U shape, with one free end thereof having a brush, and the other free end thereof being fitted to the case cover in the vicinity of internal terminals. Each of the internal terminals has an essentially V-shaped connecting part for making contact with the brush arm and is fitted to the case cover in elastically deformed state.

Abstract: A grommet 40 is coupled to one side of a brush holder stay 20. When the brush holder stay 20 is housed in an end bracket 11, a projection 42 projecting from the grommet 40 is engaged with a groove 14 which is provided in the end bracket 11. A screw insertion hole 25 opened at a position opposite to the grommet 40 of the brush holder stay 20 is adjusted with a threaded hole 16 of a boss portion formed in the end bracket 11, whereby a screw 34 is inserted therethrough and screwed in the threaded hole 16. The brush holder stay 20 is fixed to the end bracket 11 by one piece of screw 34 and the grommet 40.

Abstract: A magnetic motor is shown having magnetic members situated in relatively close proximity to each other; relative movement between the magnetic members is brought about by bringing the temperature of at least one of the magnetic members to the curie temperature thereof, and subsequent relative movement between the magnetic members is brought about by having the temperatures of all of the magnet members less than the curie temperatures thereof.

Abstract: A bearing assembly incorporating a speed and/or temperature sensor particularly adapted for motor vehicle wheel applications. The sensor incorporates a magnetized tone ring defining a radial or cylindrical face which interacts with an annular transducer. The transducer has a plurality of teeth facing the magnetized tone ring with separate first and second rows of teeth extending from the transducer frame. The first set of teeth engage one area of the tone ring defining one magnetic pole whereas the second series of teeth interact with regions of the tone ring defining the opposite magnetic pole. Relative rotation between the transducer and tone ring induces an alternating magnetic field through the transducer case which induces an alternating voltage in the winding coil. The transducer is efficiently packaged within the enclosed cavity of a bearing assembly. This invention further contemplates a means to allow transducer temperature to be evaluated by monitoring the DC resistance of the transducer winding.

Abstract: A thermal protection system for a scroll compressor has a temperature sensor which is positioned directly within the discharge passage of the scroll compressor by being directed through an access passageway between the discharge zone and the suction zone of the compressor. The lead wires from the temperature sensor are wired in series with the normal motor temperature sensor circuit to provide the scroll discharge temperature control function as an integral part of the motor temperature control system located within the hermetic shell of the compressor. An additional embodiment of the present invention not only detects discharge gas temperatures but it also has the ability to detect the actual temperature of other selected compressor components.

Abstract: A protection circuit for a permanent split capacitor motor includes a positive temperature coefficient (PTC) resistor in series with the auxiliary winding of the motor for protecting the auxiliary winding during normal operation. At a predetermined temperature anomaly due to over-current conditions in the windings, the PTC resistor will sharply increase its resistance to a point wherein no current will pass, effectively open circuiting the auxiliary winding from the power source, thereby protecting the windings from damage. A thermally responsive protector may also be used in conjunction with the PTC resistor for providing further over-current protection to both the main and auxiliary windings.

Abstract: Plastic deformation and nicking of the conductors (30) of the end turns (20) in the stator (10,12,14) of a dynamoelectric machine during the installation of a temperature sensor (26) is avoided by locating the temperature sensor (26) in a gap (22) between the coils defining adjacent end turns (20), thereby providing a machine capable of rapidly responding to excess heat even in a locked rotor situation before detectable levels of smoke, gas, and odors are generated.

Abstract: A motor has a shell formed to include an edge defining an opening that is either U-shaped or rectangular. A reversible apparatus has segments for mounting an overload protector having first and second body portions within the opening in the motor shell. The apparatus has a first profile for mounting the overload protector within a U-shaped opening in a motor shell so as to restrict movement of the mounting apparatus and overload protector assembly relative to the motor shell, and a second profile for mounting the overload protector within a rectangular opening in a motor shell so as to restrict movement of the mounting apparatus and overload protector assembly relative to the motor shell.

Abstract: A laminated, metal-polymer-metal PTC resistor (8) is held in the end cap (2) of an electric motor. Substantially parallel opposed surfaces (9 and 10) of the PTC resistor (8) are engaged by electrically conductive members (11 and 12) which are respectively connected to one of the brushes (5) and one of the motor terminals (6) so that the supply of electricity is interrupted when the PTC resistor (8) is heated above a predetermined temperature as a result of excessive current flow. The PTC resistor (8) is supported against movement perpendicular to the substantially parallel opposed surfaces (9 and 10), at least in one direction, and therefore independently of at least one of the contact members (11 and 12) so that, at most, only one of the contact members (11 and 12) is needed for supporting the PTC resistor (8). Both contact members (11 and 12) can therefore make point contact with the PTC resistor (8) and this improves operation by inhibiting the conduction of heat to or from the PTC resistor (8).

Abstract: A small D.C. motor (1) provided with a flat circular or square PTC thermistor (8) between an input terminal (7) and phosphor bronze plate (6) connected to the motor brush (5). The thermistor has electrodes on both faces and an opening provided substantially in its central portion, and it is fitted on the inside or outside of the motor casing (2). The motor shaft (9) or an extension thereof is passed through the opening in the thermistor in such a manner that the plate surface of the PTC thermistor (8) is nearly perpendicular to the shaft (9).