H - Electricity – 02 – K
Patent
H - Electricity
02
K
H02K 16/04 (2006.01) H02K 1/08 (2006.01) H02K 16/00 (2006.01) H02K 17/26 (2006.01) H02K 19/14 (2006.01)
Patent
CA 2075791
Rotor windings are wound on the poles of each of two salient pole-type rotor cores, and the rotor windings on the salient poles axially-aligned on the two rotor cores are connected in series. A diode is connected across each respective pair of lines connecting each respective axially- aligned pair of poles of the rotor cores. A plurality of rotor conductors are provided on the periphery of, and extending through, the two rotor cores. Two stators and two DC magnetic excitation windings surround and face the two rotor cores. The number of poles of the stator is the same as that of the rotor core, and the number of poles of the DC excitation windings is different from that of the rotor core. A voltage phase shifter is provided to one of the two stators to selectively produce a phase difference of 0° or 180° between the two rotating magnetic fields produced around the two salient pole-type rotor cores. The motor starts and accelerates according to the principles of an induction motor with a phase difference of 0°. When the rotational speed of the motor approaches the synchronous speed, the motor is pulled into synchronous operation by having the phase difference switched to 180° and having the DC magnetic excitation windings become operational. Alternating voltages induced in the rotor windings by the static magnetic fields of the DC excitation windings are rectified by the diodes, and magnetic poles are formed on the two salient pole-type rotor cores. The motor produces a large starting torque since it starts on the same principle as that of the conventional induction motor and, therefore, does not require any special starting means. Since the rotor windings function as field windings during the synchronous operation, the motor produces a large torque without requiring maintenance of, for example, brushes.
Onogi Yukio
Satake Toshihiko
G. Ronald Bell & Associates
Satake Corporation
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