Rotor position encoder having features in decodable angular posi

Details Rotor position encoder having features in decodable angular posi Rotor position encoder having features in decodable angular posi

1994-06-07

1996-07-23

Wysocki, Jonathan

Electricity: motive power systems

Positional servo systems

With stabilizing features

318439, H02P 700

Patent

active

055392938

ABSTRACT:
A rotor position encoder for an electric motor includes a discate member mounted to rotate with the rotor shaft. The encoder has a set of radially extending features formed with angularly evenly spaced leading edges and unevenly spaced trailing edges. The leading edges induce a signal in a sensor that corresponds to the relative timing of power switches for each motor phase. The trailing edges define a cyclical code by which motor controlling circuitry is able to determine the phase of rotation of the rotor and thus establish the correct power switch actuation sequence. An electric motor control system and methods of starting electric motors are also shown.

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