Abstract: An induction-type AC electric motor system has a variable frequency motor (VFD) drive having at least two outputs, the VFD drive coupled to be powered by a solar input and to power the motor with a switching device in a first setting. With the switching device in a second setting, a run winding of the AC electric motor couples to an AC input and a start winding of the AC motor couples through a capacitor and start switch to the AC input. The system is configured to, upon determining motor start, put the contactor in first setting and use the VFD drive to continue running the motor, and, when the AC motor is not rotating, the system is configured to periodically measure available solar power and to start the AC motor if the available solar power exceeds a first threshold power determined sufficient to run the AC motor.

Abstract: An electric power generator for marine vessels includes a containment enclosure, an internal combustion engine housed in the containment enclosure and including a drive shaft, rotating at a variable rotation speed, an alternator housed in the containment enclosure and configured to receive mechanical power from the internal combustion engine and to convert it into electric power, a second cooling circuit configured to cause sea water to circulate, and an electrical power converter connected to the alternator to receive an input current, having an input frequency, and to convert it into an output current, having an output frequency. The second cooling circuit includes a first heat exchanger configured to allow heat exchange between the sea water and the electrical power converter.

Abstract: An automated cooling system and method for energy efficient use with a building structure by adjusting operational parameters is provided. The automated cooling system can adjust operational parameters in response to conditions (e.g., temperature, humidity) detected by sensors located at one or more strategically selected locations inside or outside the building structure. The automated cooling system can ramp speeds of a motor that rotates fan blades in response to changes in the air temperature in the building structure so as to maintain a desired temperature without switching on and off the motor to preserve fan blade inertia.

Abstract: A method for executing an operation by a circuit, may include executing a first operation to process an input data, the circuit generating during the execution of the first operation a first signal, and executing in the circuit a second operation receiving the input data and configured to add to the first signal, between first and second instants during the execution of the first operation, a continuous second signal. A combination of the first and second signal forming a resultant signal in which the second signal may be indistinctly measurable with the first signal from outside of the circuit. The second signal and the resultant signal varying as a function of the input data.

Abstract: A motor vehicle drive train assembly includes an axial flux induction motor including a stator, a first rotor and a second rotor. The stator, the first rotor and the second rotor are concentric with a motor center axis. The first rotor is axially spaced from a first axial side of the stator by a first air gap and the second rotor is axially spaced from a second axial side of the stator by a second air gap. The axial flux induction motor is configured such that the first rotor is rotatable about the motor center axis by the stator at a first rotational speed to drive a first drive shaft non-rotatably connected to the first rotor while the second rotor is rotatable about the motor center axis by the stator at a second rotational speed that is greater than the first rotational speed to drive a second drive shaft non-rotatably connected to the second rotor.

Abstract: A control method for controlling a synchronous motor includes calculating d-axis and q-axis current commands according to a frequency command and frequency of the synchronous motor by a MTPA control unit; when a feedback output voltage of the synchronous motor is larger than a control level, outputting a flux-weakening current command by a voltage control unit; calculating a flux-weakening current feed-forward value according to the frequency, a target level and the q-axis current command by a feed-forward control unit; when the sum of the flux-weakening current command and the flux-weakening current feed-forward value is smaller than the d-axis current command, adjusting the d-axis current command by the sum of the flux-weakening current command and the flux-weakening current feed-forward value; and outputting d-axis and q-axis voltage commands according to the adjusted d-axis current command and the q-axis current command to control the synchronous motor.

Abstract: This disclosure relates to a control system for driving a motor. The motor may include a cut-out circuit. The control system may include a buck-boost circuit to limit the rate of change of an output voltage before the output voltage is applied to operate the motor.

Abstract: The present invention relates to a starting device for a single-phase induction motor, comprising a stator (M) with an running winding (B1) and a starting winding (B2), a starting device (28) connecting the starting winding (B2) to a source (F) of alternate voltage supply, when in a closed state, the start switch (S1) being carried to an open position when the start of the motor is ended, the starting device (28) comprising: a start switch (S1), an electronic signal-processing device (30) receiving current signals originating from a current sensor (RS) flowing through the start switch (S1) and receiving voltage signals from a current zero-crossing sensor SV, wherein the control unit (30) instructs the closing and opening of the start switch (S1) in accordance with the interpretation of the signals by voltage and current zero-crossing sensors, and time sensors.

Abstract: Start capacitor assemblies and methods for operating electric motors are described. In one example, a start capacitor assembly for connection to an electric motor includes a film capacitor and a resistor. The film capacitor has a first terminal and a second terminal.

Abstract: The present invention relates to a method, a system and an electronic device (15), especially designed for start and control of the functioning of a single-phase induction motor (12). Said motor (12) comprises a run winding (10) and a start winding (11), the start winding (11) is electrically associated to an electronic start device (15), the run winding (10) and the electronic start device (15) are electrically associated to an alternating voltage source (F) configured to supply feed energy to the motor (12), the start winding (11) is kept de-energized at a first operation instant (Top1) of the motor (12).

Abstract: Various embodiments of a motor controller are disclosed. In exemplary embodiments, the motor controller can be instructed to select an operational profile based on the duration of power loss. In an exemplary embodiment, the system comprises a battery or capacitor to provide power to a microcontroller in the motor controller while power is disconnected.

Abstract: A single-phase AC motor control circuit for a dryer, including a starting control unit, a first drive circuit, a bidirectional triode thyristor BCR1, a second drive circuit, and a bidirectional triode thyristor BCR2. The bidirectional triode thyristor BCR1 is serially connected to a motor starting winding, and a starting capacitor, and then to a utility power AC input. The starting control unit is connected to a control end of the bidirectional triode thyristor BCR1 via the first drive circuit. The bidirectional triode thyristor BCR2 is serially connected to an electrically heated strip, and then to the utility power AC input. The starting control unit is connected to a control end of the bidirectional triode thyristor BCR2 via the second drive circuit. The first drive circuit is interlocked with the second drive circuit.

Abstract: A starting circuit for a single-phase AC motor, the single-phase AC motor comprising a main winding and a starting winding, and the starting circuit comprising a detecting circuit, a rectifying circuit, a triggering circuit, and a switch, wherein the detecting circuit is connected in series with the main winding, the switch is connected in series with the starting winding, the detecting circuit transfers current parameters of the main winding into detecting signals, the rectifying circuit processes the detecting signals and transmits the detecting signals to the triggering circuit, the triggering circuit controls the switch according to the detecting signals whereby controlling power-on and power-off of the starting winding, and the triggering circuit is a hysteresis comparing circuit.

Abstract: An electronic relay for single phase induction motor, the electronic relay including a triac located between a start winding and a start capacitor of the single phase induction motor to control current flow of the start winding and an induced voltage detection circuit to detect an induced voltage of the start winding proportional to an angular velocity of the motor. The electronic relay is adapted to detect a zero-point voltage of a motor line voltage before start of the motor and to calculate an acceleration torque during start of the motor. The electronic relay is programmed to turn on the triac when the zero-point voltage of the motor line is detected and to turn off the triac when the acceleration torque begins decreasing.

Abstract: An apparatus and method for controlling starting of a motor are disclosed. An exciting coil of a motor is excited by using a controller of an electronic refrigerator without having an extra excitation control circuit, to thereby simplify a component construction for controlling exciting of the motor and thus reduce complexity. The present invention includes: a main coil and an auxiliary coil (sub-coil); an exciting coil that generates an excitation current; a refrigerator control unit that outputs a control signal for controlling an application time of the excitation current when started; and a switch unit electrically connected with the exciting coil and supplying power to the exciting coil according to the control signal outputted from the refrigerator control unit.

Abstract: A control circuit for a washing machine that avoids contact bounce short circuit failures is provided. A washing machine that utilizes an induction motor including a starting winding used to start rotation of the motor at the beginning of a cycle. Such washing machines require that the motor be operated in both directions during different cycles. To enable such operation, a mechanical timer uses a pair of single pole, double throw switches in a switching assembly to reverse the L1 and neutral connections to the starter winding. To avoid the contact shorting problem, the control wiring runs either the L1 or neutral side of the voltage source, or both, through the centrifugal switch to open the input contact(s) once the motor has reached its operating speed. Then, if the switching assembly has L1 and N contacts touching at the same time, it will not result in a dead short.

Abstract: A motor start circuit for an induction motor includes a start switch device serving the purpose of interrupting the current or voltage flow through the start winding after the start of the motor. The motor includes a main winding and a start winding, which are supplied with alternating current or voltage from a mains power supply.

Abstract: Motor start circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding (4) and an auxiliary winding (5), which are supplied with current, particularly alternating current, via current supply connections (24, 25), and with a start switching device (15) serving the purpose of interrupting the current flow through the auxiliary winding (5) after the start of the motor, the start switching device (15) being connected to a control device (20) via a connector (18), the control device (20) being connected between the current supply connections (24, 25), and with a winding protection switch (28), which is normally closed and which opens on the occurrence of a fault. The invention is characterized in that the control device (20) is connected to the winding protection switch (28) via at least one further connector (22, 17), preferably via at least one further connector (22, 17) and the auxiliary winding (5).

Abstract: A motor starting apparatus (10) includes a motor starting relay (112) to switch a motor starting capacitor (110) into a motor circuit across a run capacitor (111). The system control (116) includes an electronic voltage measurement circuit to measure a winding voltage (113, 114) of the motor winding (102, 103). The system control (116) also includes a microprocessor to run an algorithm that causes the system control to switch the starting capacitor (110) out of the motor circuit when a measured winding voltage (113, 114) exceeds a winding voltage threshold.

Abstract: The invention concerns a motor starter circuit for an induction motor, particularly a single-phase AC induction motor, with a main winding (4) and an auxiliary winding (5) supplied with current, particularly AC, via current supply connections (24, 25), and with a starter switch arrangement (15), which serves the purpose of interrupting the current flow through the auxiliary winding (5) after the start of the motor, the starter switch arrangement (15) interacting with a measuring arrangement serving the purpose of measuring the voltage across the auxiliary winding (5).

Abstract: A system and method for starting and regulating a wound rotor motor (320) including a phase-controlled SCR converter (350) and a drive circuit (330, 340) having a voltage source inverter (340) and a voltage source converter (330). The SCR converter (350) regulates power transmitted to the drive circuit from the rotor of the motor so that the ratings of the drive circuit are not exceeded. A shorting contactor (390) is employed in various embodiments to increase the efficiency of the circuit.

Abstract: Apparatus for driving a three-phase compressor assembly from a single-phase electrical power supply having first and second power lines, said three-phase compressor assembly comprising a compressor having a rotatable shaft, an electrical motor having a rotatable shaft coupled to the rotatable shaft of the compressor, the electrical motor having at least first, second and third motor windings and having at least first, second and third terminals connected to the first, second and third windings, means adapted to connect the first and second power lines of the single-phase power supply to the first and second terminals and a torque augmentation circuit for injecting current into the third terminal and including a capacitor and an electrical component in series with the capacitor, said electrical component having resistive characteristics and having means for essentially interrupting the current being injected into the third terminal.

Abstract: An apparatus for controlling an operation of a compressor includes a controller for generating a control signal for selecting an operation mode of a compressor according to an operation load of the compressor; a first switching unit connected to a motor consisting of a main coil and a sub-coil and selecting the main coil or both the main coil and the sub-coil according to the control signal; first and second capacitors electrically connected with the first switching unit; and a second switching unit connected to the first capacitor and selectively connecting the first capacitor in parallel to the second capacitor according to the control signal.

Abstract: A circuit and method measures the voltage at the main motor winding (1) and detects the points in the electromagnetic wave cycle at which this voltage “crosses” zero. The method and circuit also measures the voltage at the auxiliary motor winding (2). The voltages measured in the main winding (1) and in the auxiliary winding (2) are compared by the circuit (13) as a means for starting and restarting the auxiliary winding (2). The circuit and method also detects the points in the electromagnetic wave cycle where the current in the auxiliary winding “crosses” zero and compares the phase of these current zero crossing points with a window pulse (11) that is generated when the main voltage crosses zero. When the zero current crossing points fall within the window pulse, the auxiliary winding (2) is up to proper operating speed and the auxiliary winding (2) is disconnected by the starting circuit.

Abstract: A synchronous induction motor has a stator having a main winding and an auxiliary winding; a rotor having a yoke, a permanent magnet embedded in the yoke and a secondary conductor provided in the vicinity of periphery of the yoke; and a starter. The starter has a starting capacitor connected in series with the auxiliary winding of the synchronous induction motor, and a switching unit to open/close a circuit from the starting capacitor to the auxiliary winding. The switching unit closes the circuit from the starting capacitor to the auxiliary winding when the synchronous induction motor is at rest, and opens the circuit after the synchronous induction motor is started. The synchronous induction motor is highly efficient and easy to re-start with low power consumption. The electric hermetic compressor equipped with the synchronous induction motor can perform with the similar effects.

Abstract: This invention relates to an alternating current electric motor, single phase or multiphase or synchronous generator, with primary windings (main windings) and de-saturation additional windings. Each additional winding is fed through one or more multiple capacitors in opposite phase angle and opposite field directions from each respective main windings. The total cross sections of the wire used on each main and additional winding are of predetermined sizes and preferably follows the approximate ratio of approximately 2/3 for the main winding and approximately 1/3 for the additional winding, and this capacitor value is of a predetermined size. The method of construction is characterized by the two windings being built at one time in a single operation as a single step.

Abstract: A starting circuit for an induction motor is provided whereby a stationary rotor flux is established then a stored charge supplied to a motor winding in order to provide a starting torque. Before applying a mains power supply to the motor after the starting torque has been applied, a back EMF is sensed, directly or indirectly, to provide an indication that the rotor is turning before the mains supply is connected to the motor. This provides a reliable and simple method for ensuring that a mains supply may be safely connected to the motor.

Abstract: A method for controlling voltages in an integrated starter alternator electric machine is provided where the armature windings are manipulated in a ?/Y/? fashion. In particular, the armature windings are arranged in a ? connection during engine cranking operation, when the electric machine acts as a starter motor. After the engine is cranked, the windings are changed into a Y connection when the ISAD machine changes from motoring to generating and operates a low speeds, such as idle speed. Next, when the engine speed increases above a predetermined winding reconfiguration speed, the windings are switched from Y to ? connection. If the engine speed falls below the winding reconfiguration speed, the machine again switches the armature windings to a Y connection to take advantage of the efficiencies of the Y connection at that low speed range in the generating state.

Abstract: A starter circuit for motors, particularly for refrigerator compressors, comprising a starter device which is adapted to be connected to a starter winding and to a steady-state winding of an asynchronous motor, the windings being in turn connected to a power supply line, a capacitor being connected in parallel to the starter device; the starter circuit further comprises a resistive element which is adapted to be connected between the starter device and the capacitor, in order to limit a discharge current of the capacitor on the starter device.

Abstract: An AC induction motor has separate start and run windings radially separated in slots in the stator laminations. The start windings are arranged in the radially outer portions of the slots to aid heat dissipation and to increase the flux linkage so as to reduce inrush current during starting. The motor is started by switching on the start windings initially, and switching on the run windings in phase with the start windings when the motor reaches its running speed, but before switching off the start windings. In this way, the surge current during switching between the start and run windings is reduced.

Abstract: A three phase motor starting system is provided to reduce the in-rush current to the motor in order to obtain a soft start of the motor. The soft start of the motor equates to reduced impact forces on motor parts and device components connected to the motor during startup of the motor, especially a startup resulting from a reversal of the direction of rotation of the motor. The system uses an impedance load in series with the motor windings of the motor to reduce the in-rush current to the motor windings, which results in a reduced acceleration of the motor shaft and a soft start to the motor. The impedance loads used by the system can be a resistive load, a capacitive load or an inductive load, depending on the type of impedance load that is desired for the soft start of the motor.

Abstract: In an AC motor having a main winding connectable to an AC power source for supplying running torque, and having a start winding connectable to the AC power source for supplying starting torque, a start switch is provided for connecting and disconnecting the start winding from the AC power source in starting and running modes, respectively. A main winding voltage phase detector detects the phase of voltage across the main winding. A start winding current phase detector detects the phase of current through the start winding during the starting mode. A cut-out circuit responds to the main winding voltage phase detector and to the start winding current phase detector.

Abstract: A starting system for an electric motor having a main coil and an auxiliary coil which are supplied current by an electric current source in which a switch is connected between the electric current source and the auxiliary coil that has an open condition, in which the auxiliary coil remains de-energized by the electric current, and a closed condition for energization of the auxiliary coil with the electric current. An actuating system is positioned relative to the electric motor to receive the magnetic field produced by the motor main coil upon its energization by the electric current for operation of the electric motor that operates to close the switch in response to the magnetic field produced by the current passing through the motor main coil with an intensity above a determined minimum value, and opens the switch when the current through the main coil produces a magnetic field having an intensity of the determined minimum value.

Abstract: A device and method for controlling a supply of a current and a static capacitance to a compressor are disclosed. The device includes a control signal generating part for controlling a current and a static capacitance provided to the compressor, such that the current and static capacitance differ in a starting period of the compressor versus an operative period of the compressor, after the starting period.

Abstract: A start circuit for a single-phase AC motor controls the current through the start or auxiliary winding based on time rate of change of voltage or current, or based on the current or voltage dropping or rising some fraction from inrush value, i.e., to 50% of initial start current or to 150% of initial start voltage. The circuit can also include a default timer to time out the start current after some preset period between 300 and 1000 milliseconds.

Abstract: A driving control circuit of a hood motor, including: a hood motor section rotatably driven for ventilating the inner portion of a system; a rectifier circuit section for supplying direct current power to the hood motor by rectifying alternating current power, a controlling section for generating a control signal for controlling the operation of the hood motor; and a driving circuit section for controlling the operation of the hood motor according to the control signal from the controlling section.

Abstract: A food processor with a motor control that disables speed regulation during motor start operation and high torque operation. Whenever motor speed is less than a set speed, both a motor starter winding and a main winding are energized without speed regulation. When the motor speed is equal to or greater than the set speed, the starter winding is disconnected and a voltage controller is enabled to control motor speed. During high torque conditions, the motor speed oscillates between set speed and a lower speed as the starter winding and the voltage controller are alternately switched in and out of the motor control circuit.

Abstract: Electrical power apparatus is disclosed for selectively powering either a three-phase ac motor or a single-phase ac motor. A dc/ac inverter is configured to provide appropriately phased input signals to the three input terminals of whichever motor is being driven, with no substantial hardware reconfiguration being required. In addition, a special clamp circuit prevents an excessively high voltage from being applied to the inverter by a variable-voltage power source such as a photovoltaic array, whereby the inverter need not be sized to accommodate voltage levels substantially greater than its design voltage.

Abstract: A motor start circuit for A-C electric motors. A microprocessor-based circuit is used to detect the phase shift that occurs in the motor current as the motor goes from the initial locked-rotor state to the running state. This circuit applies current to a motor `start` winding when the motor is first switched on, but turns off the start winding when the motor achieves sufficient running speed, as indicated by the shift in phase of the current in the motor's `run` winding. For bi-directional motors with two start windings, the microprocessor can apply current to either start winding.

Abstract: A single-phase variable-frequency power supply with two output voltages drives a single-phase AC motor that has a start circuit and main winding. For permanent split-capacitor motors, the power supply maintains a constant voltage to the start winding while it reduces the voltage to the main winding at lower frequencies. The power supply can similarly control the speed of capacitor-start and split-phase motors. For fans and pumps and other variable-torque applications, the power supply maintains approximately a constant ratio of main-winding voltage to the square of frequency. The power supply is preferably an electronic pulse-width modulated inverter.

Abstract: A motor starting device (1) has a thermostatic element (14) of a first switch circuit (11), a first resistive heater (13) serially connected to the first switch circuit, a thermostatic element (22) of a second switch circuit (21) and a second resistive heater (23) serially connected to the second switch circuit. The thermostatic element (22) of the second switch circuit is heated by both the first and second resistive heaters and, after actuation, is closer to the first resistive heater (13), thereby bringing the second switch circuit (23) into a de-energized state. When the second switch circuit (21) and the second resistive heater (23) are employed in the motor starting device, it becomes possible to provide a large electric current to the start winding during the start-up phase and to make the electric current that flows to the start winding zero after the start-up phase.

Abstract: A three phase AC motor which rotates at the synchronous speed determined by the number of poles of its main stator winding and the frequency of the AC input to it, which does not need any exciter machine or brushes to provide its DC field current, but has an internal, but independently adjustable excitation system to supply its field current. The internal excitation system consists of an auxiliary winding on the stator which is additional to the main power winding, another auxiliary winding on the rotor besides the main DC field winding, a diode rectifier circuit on the rotor from which the DC field current is supplied by rectification of the induced currents in the rotor auxiliary field. The field current adjustment can be made by adjustment of the input to the stator auxiliary winding. This can be done independently by eliminating any magnetic coupling between the main and auxiliary circuits.

Abstract: A method of reinstating a start winding is disclosed wherein the start winding is disconnected when the main winding motor current reaches a predetermined value, but is only reinstated when the start winding voltage has a predetermined relationship to the main winding motor current. The method uses a solid state induction motor starter circuit which requires little or no adjustment during the life of the motor.

Abstract: A control circuit that activates and deactivates a motor start winding at different motor rpm trip points provides improved accuracy in the trip points by automatically compensating for changes in motor current caused by variations in line voltage and motor winding temperature.

Abstract: The invention relates to a single-phase induction motor comprising a main winding, an auxiliary winding which is arranged so that an electrical angle of the auxiliary winding is different from that of the main winding, a plurality of driving capacitors which are connected to the auxiliary winding, a relay for controlling on/off of the driving capacitor in response to the driving load, and a rotor having apertures on the gap side of the slots. The invention further relates to a rotor assembling apparatus comprising a bush to which a rotor core assembly is inserted for die-casting, wherein a clearance between said bush and said rotor core assembly is narrower to the extent that said rotor core assembly can be taken out after die casting; and a core band having a clearance between the core band and the bush in the circumferential direction of said bush, said core band is engaged into said bush so that movement in the axis direction is restricted.

Abstract: Device for driving a body by means of an electric motor, comprising mechanical means for measuring the displacement of said body which are kinematically linked to the body and are equipped with switches (ID, IM) actuated by the mechanical measurement means at certain points on the trajectory of the body. The device comprises means for initializing a phase for specific powering of the motor such as power supply at reduced torque for a timed duration (TP, x, C4) or power supply at reduced voltage or cut-off of the power supply, switched in by actuation of at least one of said switches.

Abstract: The single-phase induction motor has a starting device which is activated during the start-up phase of the motor and exposes at least a part of the motor coil to a voltage which changes temporarily, the average value of the voltage formed during one period of oscillation not being equal to zero.

Abstract: A start circuit for a single phase AC induction motor employs a triac or similar device in series with the motor start or auxiliary winding. The triac device has associated circuitry so that it turns on in response to an increase in the time rate of change of applied voltage. In one version a PNP transistor and a capacitive timing circuit are employed to cut in the start winding. In another version a second, pilot triac is employed.

Abstract: An auxiliary capacitance starting device is connected by only two wires to a capacitor start-induction run (CSIR) or permanent split capacitor (PSC) motor. The device includes an auxiliary start capacitor and an electro-mechanical switching relay that has a current sensing coil wound over a voltage sensing coil and a set of normally closed contacts. The relay is energized first by a current level (amperage) and then latches into an energized mode by voltage, necessarily in that order. The auxiliary start capacitor is electrically connected to the motor circuit in parallel to the start and run winding by two non-polarized leads and in series with the current sensing coil. The voltage sensing coil is connected across the normally closed contacts and senses no voltage as long as the contacts are closed.

Abstract: A starting device for single phase induction motors having a start capacitor is effective to disconnect the start capacitor at a desired motor speed in response to a specific phase relationship between the voltage across the main winding and the voltage across the start winding. The specific phase relationship is a condition wherein a phase angle defined by the phase relationship reverses from a decreasing value to an increasing value.