Current and torque feedback system and circuitry for sine-wave c

Details Current and torque feedback system and circuitry for sine-wave c Current and torque feedback system and circuitry for sine-wave c

1988-04-01

1989-06-20

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318605, G05B 106

Patent

active

048412139

ABSTRACT:
A current and torque feedback system for use with sine-wave controlled brushless servo motors each having a plurality of stator windings, a permanent magnet rotor and a rotor position sensor. Current sensors detect instantaneous values of electrical currents in each of the stator windings; and circuitry computes peak current values and electrical polarity of each current. Circuitry uses sensor signals from the rotor position sensor to divide the electrical revolution of the brushless motor into a number of regions equal to the number of phases of the brushless motor with each of the regions centered about the peak values of the sensed currents. The peak values of the currents and the current polarities are coupled to circuitry which generates an output signal having a value proportional to the peak values of the currents and having a polarity indicative of the direction of the torque generated by the brushless motor.

REFERENCES:
patent: 4151452 (1979-04-01), Yonescu
patent: 4358722 (1982-11-01), Iwakane et al.
patent: 4447771 (1984-05-01), Whited
patent: 4547719 (1985-10-01), Sakamoto et al.
D. S. Evans et al; "Digital-to-Synchro Conversion", Automation (G.B.) vol. 5, No. 8, pp. 23-26.

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