Abstract: An electric motor for a vehicle includes a stator, a rotor and a plurality of independent bridge drivers. Each bridge driver supplies a portion of current to the electric motor. There may be a phase shift between each independent bridge driver. Optionally, each bridge driver delivers current at a slew rate that is different from each other independent bridge driver.

Abstract: In a rotary machine control device for controlling a rotary machine having a multi-group multiphase configuration, a phase difference ?coil of 150° to 210° (excluding 180°) is electrically provided between a winding for an odd-number group and a winding for an even-number group in the rotary machine, wherein, when the effective value of a voltage command is smaller than a voltage threshold, the phase difference between the voltage commands for the respective groups is set to 180°, and when a torque command is greater than a torque threshold, the phase difference between the voltage commands for the respective groups is set to ?coil.

Abstract: A power converter includes a first inverter, a second inverter, and a switching circuit including first and second switching elements. In a state in which, in the first inverter, potentials at a first node in a high side and a second node in a low side are equal to each other, and potentials at first ends of two-phase windings of n-phase windings with n being an integer of 2 or more are equal to each other, two-phase windings are energized using two legs connected to second ends of the two-phase windings of n legs of the second inverter while performing switching operations on the first and second switching elements of the switching circuit at a predetermined duty ratio.

Abstract: A motor drive control device causes a single phase motor including a coil of a first system and a coil of a second system to be driven. The motor drive control device has a first driving circuit configured to perform control to energize the coil of the first system, a second driving circuit configured to perform control to energize the coil of the second system, and a driving control unit configured to control an operation of the first driving circuit and an operation of the second driving circuit. The driving control unit has a driving voltage detecting unit configured to detect a driving voltage applied to the first driving circuit and a driving voltage applied to the second driving circuit, and a compensation control unit configured to cause one driving circuit between the first driving circuit and the second driving circuit to execute a maintenance operation for maintaining rotation of the single phase motor, based on a detection result of the driving voltage detecting unit.

Abstract: A power supply device includes an output semiconductor element and a clamp circuit. The output semiconductor element is provided between a power supply line and an output terminal. The output semiconductor element is driven and switched so as to supply electric power to an inductive load connected to the output terminal. The clamp circuit clamps a voltage applied between the power supply line and the output terminal due to a counter electromotive force generated in the inductive load when the output semiconductor element turns OFF, with reference to an operation reference voltage of the output semiconductor element. Thus, it is possible to provide a power supply device including a clamp circuit which can effectively clamp a negative voltage surge derived from a counter electromotive force generated in an inductive load, at a low clamp voltage.

Abstract: An electric motor system including: a rotor (9); a stator (8); the rotor and the stator being mounted for movement relative to one another; the rotor having multiple magnetic poles (11); the stator having multiple salient poles (12) facing the magnetic poles; a first coil set (1A) and a second coil set (1B); the first coil set having three phases, each of the phases comprising a first coil (u1, v1, w1) and a second coil (u1 v1?, w1?) connected in series and wrapped around different of the salient poles in different directions relative to the rotor; the second coil set having three phases, each of the phases comprising a first coil (u2, v2, w2) and a second coil (u2?, v2?, w2?) connected in series and wrapped around different of the salient poles in different directions relative to the rotor; a driver (2) configured to drive the first coil set with a first three-phase voltage (U1, V1, W1) and to drive the second coil set with a second three-phase voltage (U2, V2, W2); the driver configured to drive the first p

Abstract: The invention relates to a control method implemented in a variable speed drive for determining the inductances (Ld, Lq) of a permanent magnet synchronous machine comprising three phases (a, b, c), each oriented along a direction, a stator, and a rotor. For each phase, one after the other, said method includes steps of: applying, along the direction of the phase (a, b, c), a voltage vector (V1, V3, V5) in the positive direction and a voltage vector (V2, V4, V6) in the negative direction for a predetermined duration; measuring the current obtained in the phase after applying the voltage vectors in both directions; determining an angle (?r) for the position of the rotor in relation to the stator based on the measured current; and determining the flow (Ld) and torque (Lq) inductances of the machine based on the predetermined angle (?r).

Abstract: An induction motor system comprising an induction motor, equipped with a heat recovery and water pumping apparatus and an apparatus for controlling the electrical efficiency and resulting heat generation of the induction motor. The motor is adapted to be coupled to an AC source for supplying an AC signal. The controlling apparatus includes a switching device, user controls and optional inputs. The switching device is connected in series with the motor and is operative in either a high impedance state wherein significant current flow through the motor is prevented or a low impedance state wherein current flow through the motor is substantially undisturbed. The user controls provide motor operational input signals. The optional inputs provide setpoint and sensed water temperature input signals.

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: The present invention provides an improved model and methodology for simulating motor performance which allow increased control accuracy at the higher currents, higher speeds, and/or higher current change rates required in modem mass storage devices. In addition, the invention provides methods for simulating motor performance, and for testing a motor commutation scheme. The model includes a plurality of phases extending between first ends joined at a center tap and second ends extending outward from the center tap to a corresponding plurality of phase taps, and a mutual inductance component disposed between two of the phases, wherein the mutual inductance and/or the phase inductance components may be a function of rotor position and/or current.

Abstract: A method and system for the sensorless estimation of the states of the mechanical subsystem of a motor are disclosed. In particular, the method and system split the estimation problem into two sub-problems: the estimation of motor parameters as a function of position, and the determination of the states of the mechanical subsystem of the motor using the estimated parameters via a state observer. Motor current and PWM voltage in a polyphase system is measured or otherwise determined and converted into current and voltage in ?-? coordinates. A least square estimator is constructed that uses the voltage and current in ?-? coordinates and provides an estimate of the motor parameters, and in particular, the inductances of the motor, which are a function of the rotor position.

Abstract: A power controller for applying power to an induction motor or similar AC load has a variable drive circuit for staring and switching a portion of the AC input line power. In one mode, the input line power is fed straight through to the load. In another mode, the AC waveform is reshaped to improve the power factor or to boost its RMS value, e.g., for brownout protection. In a further mode the output power can be provided at a different frequency from the input line power. Vector control increases efficiency through power optimization, with sensing of load requirements. Sensing of regeneration pulses at the commencement of a half cycle can be employed for direct sensing of motor speed or load.

Abstract: An insulation insert (40) is provided for preventing electrical shorts and/or arcing between adjacent strands in a stator coil. The insulation insert includes a thin base (42) of substantially uniform cross section and a lead-in nose (43) formed in the thin base (42) for guiding the insulation insert (40) into a position between adjacent strands. The insulation insert (40) includes two substantially vertical cuts (45) in the thin base (42) above the lead-in nose (43), which delineate a center section (44) flanked by two ear portions (46). A head (54) and two wings (52) are formed in the insulation insert by folding the ear portions (46) along substantially horizontal creases (47).

Abstract: A system includes a motor mounted within a housing and a compressor pump unit. A single-phase PSC motor includes a switch assembly which selectively connects primary or alternate windings. During normal load operation, when maximum efficiency is desired, the switch is placed in one position, then during high load operation, when maximum torque output is needed at maximum a load point, the switch is placed in the closed position. In effect, the number of main winding turns is decreased and the motor is strengthened. As the auxiliary capacitors are also now connected in parallel, the net effect is an increase in the total auxiliary capacitance, which also serves to strengthen the motor. Another embodiment provides a switch for a three-phase WYE connected motor. In yet another embodiment, a three phase delta connected motor switch is provided.

Abstract: Method for controlling the speed of a single-phase asynchronous induction motor, the stator of which is equipped with a main winding (BP) and an auxiliary winding which consist of half-windings (B1, B2) which are magnetically coupled and wound in opposite directions, in which method the main winding is powered directly using an AC source and the auxiliary winding is powered using a current delivered by a full-wave rectifier and using two switching devices (T1, T2), so as to generate in the auxiliary winding a current which is phase-shifted by 90.degree.. The method consists in varying the motor torque by altering the time that at least one of the switches spends closed/open.

Abstract: A driving circuit for a stepping motor comprises bridge circuits being composed of switching elements connected between a DC power source and the coils of a stepping motor, rectifier diodes connected in antiparallel to the switching elements, capacitors connected in parallel to the bridge circuits, and constant voltage diodes connected between the DC power source and junction points of the bridge circuits and the capacitors. The switching elements are constituted to be ON/OFF controlled by a predetermined exciting system, and the constant voltage diodes are set to turn conductive to form a feedback circuit even if they are in a biased state in the reverse direction when the capacitors are charged up to a voltage which is higher than the source voltage and lower than the breakdown voltage of the switching elements by the counter electromotive force induced in the coils.

Abstract: A single phase induction motor having a main field winding and an auxiliary field winding provided with a phase advancing capacitor is controlled by a control unit having a timer unit and a by-pass switch for by passing the phase advancing capacitor. The main field winding is provided with a main switch operable by a relay controlled by the timer. The control unit also has a clutch detecting unit which detects the engagement and disengagement of the clutch adapted to couple the motor with a load such as a sewing machine. The timer is so set to activate the relay after a predetermined time period when the clutch is disengaged to relieve the motor of its load, whereby the relay causes the main switch to open, and the by-pass switch to close, such that the motor is operated solely on the auxiliary field winding when no load is applied, so as to save the power consumption at an idling operation.

Abstract: A motor drive system for driving a single-phase PSC motor, in which the two motor windings are conductively isolated from each other, from a two phase power source. In one embodiment, the PSC motor is supplied from a two phase inverter circuit. The PSC motor is also connectable through a four-pole double-throw switch to either a single phase source including a run capacitor or the two phase inverter circuit.

Abstract: A substantial reduction in required startup current is obtained in a drive arrangement with a three phase motor in that the stator winding of the motor comprises more than two winding legs per phase, all the winding legs of one phase being arranged in identical slots. During running up to speed of the motor, the more than two winding legs of each phase are wired symmetrically and are connected to the network in such a way that the magnetic fields produced by at least two winding legs per phase cancel each other out and only the remaining winding legs produce a rotating field.

Abstract: A circuit for starting three-phase motors having a pole pair number p=2 and an uneven slot number q (slots per pole and phase) which is larger than 1 has a motor winding which is divided into two sections which can be switched on successively. To avoid a unilateral magnetic pull on the rotor during start up, the winding section to be switched on first includes more than one-half of the coils employed in each phase. These coils are tied together to form at least two identical parallel branches which are spatially shifted 360.degree. per pole. The balance of the coils, which form the winding section to be switched on later, are tied together to form at least one further parallel branch, and this branch (or branches) has the same number of turns as each of the parallel branches of the winding section which is to be switched on first.

Abstract: A first static commutator including a first controllable thyristor rectifier and a first thyristor inverter and a second static commutator including a second controllable thyristor rectifier and a second thyristor inverter are provided. First three-phase AC voltage is supplied to the first controllable rectifier, and second three-phase AC voltage 30 degrees out of phase with said first three-phase AC voltage is supplied to the second controllable rectifier. A brushless motor includes first star-connected three-phase windings receiving the output of the first inverter and second star-connected three-phase windings and 30 degrees out of phase with said first three phase windings. During the starting period of the brushless motor the conduction of the first and second satic commutators is switched for every 30-degree rotation of the brushless motor.

Abstract: A single phase alternating current induction type motor is operative at more than one voltage level using the same winding circuitry. The motor has a main winding comprising two serially connected sections similarly formed and physically disposed in slots of a slotted stator core to define a number of primary magnetic poles. A second phase winding, such as a start winding, displaced in phase from the main winding sections, is connected in series with one of the main winding sections and in parallel with the other of the main winding sections. A thermistor is permanently connected in series with the start winding, the thermistor increasing in temperature in response to current flow therethrough to a preselected point where the effectiveness of the second phase winding becomes substantially less than during starting conditions regardless of the operating voltage.

Abstract: A single phase motor is disclosed which comprises a stator assembly having a main winding, a start winding and an auxiliary winding wherein the start and auxiliary windings are connected in two alternative configurations during start and run conditions, respectively. During the start condition, the start and auxiliary windings are interconnected by a series connection which causes current to flow through the auxiliary winding in a reverse direction to the flow through the start winding so that there exists a bucking magnetic relationship between the fields in the start and auxiliary windings. During the run condition of the motor, however, the start and auxiliary windings are interconnected by a second series electrical connection which causes the current to flow through the auxiliary winding in a direction opposite the first direction so as to cause the magnetic fields in the start and auxiliary windings to be in an aiding relationship thereby improving motor operating efficiency.

Abstract: A dynamoelectric machine having a low A ratio during its starting mode and a high A ratio during its running mode. During the starting mode of the dynamoelectric machine, an auxiliary winding serially connected in bucking relation with a phase winding is excited therewith across a main winding. Generally as the dynamoelectric machine is energized to a predetermined speed indicative of the occurrence of its running mode, the phase winding and the bucking auxiliary winding are electrically disassociated, and another auxiliary winding serially connected and arranged in additive relation with the phase winding is excited therewith across the main winding.A method of operating a dynamoelectric machine and a circuit are also disclosed.