Electricity: motive power systems – With flywheel or massive rotary member
Patent
1976-04-26
1978-04-18
Rubinson, Gene Z.
Electricity: motive power systems
With flywheel or massive rotary member
318171, H02P 318
Patent
active
040853551
ABSTRACT:
A synchronous polyphase motor is driven and regeneratively braked by relatively high-frequency power switching circuits that cause stator currents to vary sinusoidally with rotor position so the resultant magnetic field of the stator rotates with the rotor field at a constant optimum torque angle (leading for forward torque and lagging for reverse torque). The system includes a rotor position transducer that provides signals for each motor phase which vary sinusoidally with rotor angle for synchronous control of current in the associated stator winding, circuits to extract speed and direction, polarity, and relative amplitude from said signals, means to multiply said amplitudes by a variable which commands stator current levels, servo loops (each comprised of an operational amplifier, a pulse duration modulator, switching logic, and a current sensor) that control current in each stator winding in synchronism with rotor position and in response to forward drive, brake, and reverse drive commands and the commanded current levels; plus a circuit to adapt rotor excitation to stator current and motor speed, and an interlock including means to interpose regenerative braking whenever a motor drive command is received opposite to the motor rotation.
REFERENCES:
patent: 3584276 (1971-06-01), Ringland et al.
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