Speed control apparatus for a synchronous motor

Details Speed control apparatus for a synchronous motor Speed control apparatus for a synchronous motor

1985-06-05

1988-03-29

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318722, H02P 540

Patent

active

047346337

ABSTRACT:
A speed control apparatus for a synchronous motor is provided with a resolver fixedly connected to a rotor of the motor, which produces a phase modulated signal corresponding to an angular position of revolving magnetic field in the motor, a circuit for converting the phase modulated signal into a rotational speed signal of the motor, a phase compensation circuit for advancing in phase a reference signal in accordance with the rotational speed signal, a multiplier for multiplying the phase modulated signal and a rotational speed instruction signal, a synchronous rectifier for synchronously rectifying the output of the multiplier by an output of the phase compensation circuit, and a current control loop circuit for receiving an output of the synchronous rectifier and for producing a signal having a phase angle delayed as much as the phase angle is advanced in the phase compensation circuit.

REFERENCES:
patent: 4125796 (1978-11-01), Nagase et al.
patent: 4246528 (1981-01-01), Nakajima
patent: 4262241 (1981-04-01), Azusawa
patent: 4276504 (1981-06-01), Nagase et al.
patent: 4357569 (1982-11-01), Iwakane et al.
patent: 4358722 (1982-11-01), Iwakane et al.
patent: 4384242 (1983-05-01), Ono
patent: 4489266 (1984-12-01), Frazolini
patent: 4547719 (1985-10-01), Sakamoto et al.
patent: 4629958 (1986-12-01), Kurakake et al.

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