Motor control system
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United States of America Patent
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-
Oct 16, 2001
Grant Date -
N/A
app pub date -
Jun 8, 2000
filing date -
Oct 2, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric motor is described in which a position sensor is provided which generates a plurality of output signals each dependent upon the relative position of the rotor and the stator. These signals are processed to generate a set of commutation control signals for controlling the commutation of the drive current to the stator coils. In one embodiment, a phase shift can be electronically applied to each of the position sensor coils to adjust the timing of the switching in accordance with the motor's current speed and load demands. In another embodiment, these signals are also used in a servo-control loop, in order to control, for example, the speed and/or output torque of the motor.
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