Abstract: A stator includes four split cores arranged in the circumferential direction. Each split core includes a yoke including a pair of joint parts, and a tooth. The shape of an end of the tooth is asymmetrical. An angle ?1 (degrees) formed by a side surface of the tooth and a side surface of the yoke on the inner side in the radial direction of the stator satisfies 90 degrees<?1<180 degrees.

Abstract: An axial flux motor having reduced spatial harmonics including a rotor with a plurality of magnets. A rotor shaft is coupled to the rotor. A stator faces the rotor and an air gap defined between the rotor and the stator. The stator includes a plurality of electromagnetic components defining a plurality of magnetic poles. The electromagnetic components include a plurality of posts, a plurality of slots, and a plurality of distributed electrically conductive windings disposed in and spanning across nonadjacent slots of the plurality of slots. At least one electrically conductive winding has a winding pitch span of greater than or equal to about 3 to less than or equal to about 20. The axial flux motor may include two rotors and one stator or alternatively two stators and one rotor. Such axial flux motors have short pitch provide desirable reduced spatial harmonics to enhance motor performance.

Abstract: An example motor includes: a rotor with a plurality of alternate polarity permanent magnets; and a stator forming a like number of poles. The stator forms one or more biasing features concentrating magnetic flux at at least one location. In some examples, the stator has an interior surface unbroken by locating features, and the stator has one or more openings that form the one or more biasing features.

Abstract: A polyphase electric motor has a rotor, a stator with a plurality of slots, a plurality of main windings and a plurality of auxiliary windings installed in slots of the stator, and a main winding and an auxiliary winding that correspond to a selected phase of an alternating current power source. The auxiliary windings are connected to the motor terminals through a plurality of capacitors, and the auxiliary windings and corresponding capacitors are connected in parallel to the main windings. The main winding and the auxiliary winding of the selected phase are offset by about 60 to about 120 electrical degrees. A power of the plurality of main windings is at least 75% of a power of the polyphase electric motor at full load rating and the power of the plurality of main windings is motoring at 25% of the full load rating.

Abstract: In various embodiments, the present disclosure provides a speed control system for a motor that includes a fixed speed control portion and a variable speed control portion. The fixed speed control portion is operable to control a speed of a motor in a fixed speed mode wherein the motor is operated at a preselected fixed speed below a predetermined fixed speed mode threshold speed. The variable speed control portion is operable to control the motor in a variable speed mode wherein the motor is operated such that a speed of the motor can be selectively varied within a range between the fixed speed mode threshold speed and a maximum motor speed. The system additionally includes a switching device structured and operable to selectively switch the speed control system between the fixed speed mode and the variable speed mode.

Abstract: A PSC motor includes a stator core, a rotor arranged in a rotation relationship with respect to the stator core, a first to eighth winding coil sets wound around the stator core and a capacitor. The motor has two kinds of configurations for 4-pole and 6-pole operation modes, respectively. Both configurations comprise a primary winding and a secondary winding which is connected in series with the capacitor, and have two reversible operation directions. The configurations operate different sets of winding coils when operating in different directions.

Abstract: A six lead, two speed, consequent wound, single phase induction motor with a tapped auxiliary winding having a 2-pole high speed mode and 4-pole low speed mode. A portion of the auxiliary winding is connected in series with the four pole main winding. The 4-pole low speed mode has an efficiency of over 80%.

Abstract: A PSC motor includes a stator core, a rotor arranged in a rotation relationship with respect to the stator core, a first to eighth winding coil sets wound around the stator core and a capacitor. The motor has two kinds of configurations for 4-pole and 6-pole operation modes, respectively. The configuration for the 4-pole mode comprises a primary winding and a secondary winding which is connected in series with the capacitor, and has two reversible operation directions. When operating at one direction, the primary winding includes the first to fourth winding coil sets, and the secondary winding includes the fifth to the eighth winding coil sets; and when operating at another direction, the primary winding includes the fifth to the eighth winding coil sets, and the secondary winding includes the first to fourth winding coil sets.

Abstract: A six lead, two speed, consequent wound, single phase induction motor with a tapped auxiliary winding having a 2-pole high speed mode and 4-pole low speed mode. A portion of the auxiliary winding is connected in series with the four pole main winding. The 4-pole low speed mode has an efficiency of over 80%.

Abstract: An alternating current, multiphase, squirrel cage induction electric motor in a unique inverted design, including a method of applying the motor with controls, operator interface, batteries, and peripheral devices to propel a non-polluting electric vehicle.

Abstract: An electronic circuit for starting a single phase induction motor, of the type containing a rotor and a stator with at least one running coil (B1) and one starting coil (B2), for operating jointly with an alternating current source (F), comprising: a trigger electronic switch; a trigger circuit (TR) of said trigger electronic switch; and a blocking circuit (BL) for controlling the trigger pulses of the trigger electronic switch, said blocking circuit (BL) sustaining its blocking state while there is voltage being induced to the coils of the motor (M) by rotation of the rotor, maintaining said blocking state for a certain time after said induced voltage has been substantially reduced.

Abstract: A 4/6 pole PSC motor having main and auxiliary winding configurations. Common windings are energized in both a 4-pole configuration and energized in a 6-pole configuration for both the main and the auxiliary winding configurations. An additional winding is energized in the 4-pole configuration only. As a result, the air-gap flux level of the 4-pole configuration can be varied substantially independent of the air-gap flux level of the 6-pole configuration by varying the configuration of the additional winding.

Abstract: A single phase, three-speed Pole-changing electric motor has a stator and a rotor rotatably mounted within the stator. The stator includes a core having a plurality of slots, and a plurality of windings in the slots for operating at least three speeds. The windings are configured and arranged so that a substantial portion of the windings used in operating at one speed are used in operating at another speed. The reconnection of windings for different speeds is simple and easy to implement, for example with an external timer, switch, or relay.

Abstract: A motor comprising a 2/4-pole permanent-split capacitor motor having a shared main winding and a shared auxiliary winding. The shared auxiliary winding comprises a 4-pole auxiliary winding phase shifted one slot less than a phase shift of 90 degrees with respect to the 4-pole main winding. A switching circuit selectively simultaneously energizes the shared main winding and the shared auxiliary winding in the 2-pole and 4-pole configurations.

Abstract: Problems associated with maintaining a large inventory of multiple types of motor controllers designed to accommodate a single motor type are eliminated in a motor controller that automatically senses if it connected to a delta motor or a wye motor and configures itself for operation in a compatible mode.

Abstract: A speed reduction switch for a multiple speed induction motor includes a speed selector switch and a delay element. As the motor is switched from a high speed to a lower speed, the delay element temporarily prevents electrical connection of a motor auxiliary winding for low speed operation. The motor is therefore de-energized and slows down. After a preselected delay, the delay element connects the motor auxiliary winding when the motor is at a lower speed so that little magnetic braking of the motor occurs, and the motor smoothly transitions from a higher speed to a lower speed.

Abstract: A winding circuit for use with different input signals includes a first main winding, a second main winding, and an auxiliary branch having an auxiliary winding permanently and serially connected to a capacitor. The windings and auxiliary branch are alternatively configurable in one of a first configuration or a second configuration for use with respective first and second input voltages. When in the first configuration, the first main winding, the second main winding, and the auxiliary branch are connected in parallel. The input voltage signal then may be applied across the first main winding. When in the second configuration, the first and second main windings are serially connected, and the auxiliary branch is connected in parallel with one of the first and second main windings. The input voltage signal then may be applied across the first main winding and the second main winding.

Abstract: A single phase alternating current four pole/six pole capacitor run induction motor is provided having a stator assembly including three coil groups, each of the coil groups having four coil sets. Each of the winding sets can change the direction of current flow in its half of the coil sets by reconnecting the coil sets either in parallel or in series. For high speed operation, the coil sets of group one are connected parallel with one another, and in series with the similarly parallel connected coil sets of group two. This arrangement defines a four pole main winding for the motor. A pair of the coil sets of group three are connected in parallel with one another, and defines the four pole auxiliary winding for the motor. In six pole operation, the coil sets of group one 1 are connected in series to parallelly connected coil sets of group three to define the six pole auxiliary winding.

Abstract: A controller is provided for use with electric motors which will achieve a two mode motor operation. In this operation, a first mode is utilized having a torque configuration thus more efficiently providing high torque outputs from the motor. However, a second configuration is also used which more efficiently accommodates high speed operations albeit at the expense of some output torque. The system accomplishes this two mode operation in a low cost manner so as to minimize the overall cost of products or devices utilizing this power control system.

Abstract: An alternating current induction motor having a multitapped RUN winding and including a controller which automatically determines an instant tap selection in response to changes in applied a.c. electric power voltage level appearing immediately at the motor terminals. A measure of instant level of the motor terminal voltage is utilized to automatically reselect the RUN winding tap selection in order to maintain a near constant level of magnetic excitation in the stator field irrespective of immediate changes or variations in the available motor terminal voltage. Electric lawn mowers, power tool motors and other heavily loaded motors which may normally be operated at the end of various lengths of especially long and lossy extension cords or the like may advantageously utilize my control technique to maintain operation with an about normal and constant level of power, independent from usual performance degrading voltage drop losses commonly encountered in the extension cord.

Abstract: A brushless direct current motor includes a permanent magnet mounted to a rotor and a set of commutated stator windings. The motor further includes a circuit for changeably connecting the set of stator windings to operate in a first electrical configuration or a second electrical configuration and a circuit for commutating the set of stator windings when connected in the first electrical configuration or the second electrical configuration.

Abstract: An energy efficient electric motor is provided with a supplementary run winding arrangement which operates in conjunction with the motor's main run winding to produce a combined magnetic field with sufficient strength to operate the motor under full load. Less than full load operation obtains increased efficiency through a reduction of power flow to the supplementary run winding arrangement, which brings about a significant reduction in stator core structure (eddy current) losses and winding (resistance) losses. A controller may predetermine the normal amount of magnetic field strength necessary during each portion of the motor's usual operating cycle and variously modulate the instant level of power coupled with the supplementary run winding arrangment.

Abstract: An electrical machine driven by a pulse-controlled a.c. converter contains multiple phases subdivided into a number of n.gtoreq.2 equivalent phases sections that are extensively magnetically decoupled relative to each other. Each phase section is fed by a separate frequency converter. The clocking of the frequency converters for the n phase sections ensues out of phase by an angle of 2.pi./n relative to each other phase section.

Abstract: A pole amplitude modulated electric machine is operated at continuously variable speeds between fixed limits by a control circuit which rapidly switches the stator winding between the upper and lower pole number configurations. The switching is controlled such that the stator winding remains in each configuration for a time which exceeds the cycle time of an external power source but is less than the combined magnetization-rotor loop time constant of the machine. Phase control of the switching can be used to control speed in the vicinity of the fixed limits. In all cases, the input power frequency remains constant.

Abstract: A single phase alternating current electric motor is provided with a main stator winding having two coil groups each including the series connection of three coils. These coil groups can be connected in series for six pole operation and in parallel for four pole operation. The coils are approximately equally spaced around the periphery of the machine but are not of equal numbers of turns. The two coil groups are identically wound and spaced 180 mechanical degrees apart. One coil of each group has more turns and a greater span than the other two coils.

Abstract: A single phase alternating current two pole/six pole motor is provided with a main stator winding having six coils disposed unequally around the periphery of the machine. These coils are divided into two groups. When these groups are connected such that their magnetomotive forces are additive, two pole motor operation results. When the polarity of one of the groups is then reversed, six pole motor operation results. An auxiliary stator winding which is similar to the main stator winding is displaced from the main stator winding by 90 electrical degrees on a two pole basis.

Abstract: A single phase alternating current electric motor is provided with a main stator winding having two coil groups which are connected to form eight poles for eight-pole operation and to form six poles for six-pole operation. Each group contains four series connected coil elements with each element spanning approximately one-seventh of the periphery of the machine. The coil groups are spaced 180 mechanical degrees apart such that each end coil of one group overlaps one of the end coils of the other group. An auxiliary stator winding having two coil groups with the same relative angular displacement as the main stator winding coil groups is included.