Model reference following commutation circuit and adjusting meth

Details Model reference following commutation circuit and adjusting meth Model reference following commutation circuit and adjusting meth

1996-05-22

1997-04-01

Wysocki, Jonathan

Electricity: motive power systems

Limitation of motor load, current, torque or force

318254, H02P 700

Patent

active

056169965

ABSTRACT:
A circuit and method for controlling commutation of an electric motor includes first and second n-bit counters. The counters alternately serve as model reference and model following counters during alternate zero-cross intervals of a detected back-emf signal which is generated during rotation of the electric motor. The model following counter counts clock cycles occurring since a detected zero cross and continues counting until an optimal commutation switching point is detected, which is ideally located halfway through a commutation interval. A masking circuit is provided to mask spurious zero cross detections during a desired masking interval. A soft switching circuit determines commutation starting and ending points which are symmetrically located with respect to a center point of a commutation interval. Overflow protection circuits protect the counters from overflow during long commutation intervals and the like, and the internal clock is modulated to prevent overflow during certain operating conditions.

REFERENCES:
patent: 4752724 (1988-06-01), Radziwill et al.
patent: 4874993 (1989-10-01), Tanaka et al.
patent: 5177416 (1993-01-01), Inaji et al.
patent: 5221881 (1993-06-01), Cameron
patent: 5233275 (1993-08-01), Danio
patent: 5317243 (1994-05-01), Cameron

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