Abstract: A method is provided of calibrating a position sensor of an electric motor of a vehicle.

Abstract: An apparatus includes an inverter including a high-side switch coupled to a low-side switch, the inverter generating a time-varying drive current from a plurality of drive control signals, a positive rail voltage, and a negative rail voltage wherein controlling the switches to generate the time-varying drive current produces a potential transitory overshoot condition for one of the switches of the inverter; a drive control, coupled to the inverter, to generate the drive control signals and to set a level of each of the rail voltages responsive to a plurality of controller signals; and a controller monitoring one or more parameters indicative of the potential transitory voltage overshoot condition, the controller dynamically adjusting, responsive to the monitored parameters, the controller signals to reduce a risk of occurrence of the potential transitory voltage overshoot condition.

Abstract: A vehicle generator motor has a generator motor that is connected to an internal combustion engine and plural sets of three-phase windings, plural sets of inverter portions connected to the respective sets of the three-phase windings, and a control circuit portion for controlling the inverter portions in accordance with the operation state of the generator motor. When the generator motor operates as a motor and a variation value of an output torque or power generation amount thereof exceeds a predetermined value, the control circuit portion controls the inverter portions so as to stop armature current flowing in at least one set in plural sets of three-phase windings.

Abstract: A machine (FIG. 3B) includes inner and outer stator (5 and 6) and a rotor (2) located therebetween. The rotor includes a wall with a constant thickness and an elongates S-ribbon (172) overlapping the gaps in the wall of the rotor.

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 sinusoidal acceleration trajectory controller is used in positioning a transducer at high speed to minimize vibration and acoustic noise. The controller reduces vibration and acoustic noise without sacrifice of seeking time by using a sinusoidal waveform as the actuator input. This sinusoidal waveform is a function of target track position and the seeking terminal time. When the velocity of the read/write head on the transducer reaches a maximum velocity, the sinusoidal waveform becomes a segment sinusoidal waveform, including a zero value waveform between two half sinusoidal waveforms. The amplitude of the sinusoidal waveforms and the coast period are minimized to obtain the minimum harmonic content in the segment sinusoidal waveform.

Abstract: An induction synchronous motor comprises: a unitary rotor having a first and a second rotor core; a first and a second stator mounted surroundingly facing the first and the second rotor core; a voltage phase shifting means for producing a first and a second phase differences; a static magnetic field around each of the first and second rotor cores; and a rotor magnetizing means having diodes for rectifying alternating voltages and for having the resultant direct current produce magnetic poles in the first and second rotor cores. The motor is caused to initiate its operation as an induction motor based on the first phase difference produced by the voltage phase shifting means, to have the first phase difference shifted to the second phase difference produced by the phase shifting means operated, and to have the first and second rotor cores produce the magnetic poles attracted by the rotating magnetic field produced by the first and second stators, resulting in the synchronous operation of the motor.

Abstract: A variable speed rotary electric machine comprises a stator composed of a stator core and first and second stator windings wound on the stator core, and a cage rotor mounted rotatably within the stator and composed of a rotor core and rotor conductor disposed in a squirrel-cage configuration. The first stator winding is connected to an AC power supply of a fixed frequency. The second stator winding is connected to a power supply of a variable frequency. The first and second stator windings are so wound as to form, respectively, numbers of poles differing from each other. The rotor conductors of the cage rotor are electromagnetically coupled with the magnetic flux generated by the first and second stator windings, respectively, and so disposed as to form a number of poles which is intermediate between the number of the poles formed by the first stator winding and the number of poles formed by said second stator winding.

Abstract: A variable speed induction motor drive system operating at a leading power factor. A prescribed reactive power is coupled to the motor's rotor, to permit line commutation of an inverter supplying the motor's stator, and to permit the inverter to be supplied by a substantially constant dc link voltage.

Abstract: A variable-speed, leading power factor AC machine which may be supplied through a line-commutated inverter.