Control circuit for an electric motor

Details Control circuit for an electric motor Control circuit for an electric motor

1989-12-04

1991-07-23

Ro, Bentsu

Electricity: motive power systems

Switched reluctance motor commutation control

318138, 318723, 318721, H02P 602

Patent

active

050346687

ABSTRACT:
A low noise, high bandwidth, sensorless vector control for a brushless DC motor includes a phase locked loop control having a digital counter and ROM look-up table which is responsive to a VCO to generate digital signals representing the sine and cosine of the instantaneous phase angle of the VCO. These signals are modulated by a current command and applied to a two-phase to three-phase converter. A flux sensor senses the air gap flux in the three motor coils and converts this signal to quadrature components which are compared with the output of the look-up table to derive a phase error signal that drives the VCO. Another feature of the invention is a timed self-starting network that cause the VCO frequency to ramp upwards then automatically switch to loop control without any abrupt change in the frequency of the VCO.

REFERENCES:
patent: 4275343 (1981-06-01), Fulton et al.
patent: 4361791 (1982-11-01), Plunkett
patent: 4469997 (1984-09-01), Curtiss et al.
patent: 4608527 (1986-08-01), Glennon et al.
patent: 4912378 (1990-03-01), Vukosavic
patent: 4967122 (1990-10-01), Rees
patent: 4970445 (1990-11-01), Kimura et al.

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