Method and circuit arrangement for sensorless engine load detection and for controlling the motor current in accordance with the load value in stepper motors
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United States of America Patent
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Oct 22, 2013
Grant Date -
Jun 21, 2012
app pub date -
Sep 6, 2010
filing date -
Sep 5, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A method and a circuit arrangement are provided which enable a mechanical load applied to the motor shaft of a stepper motor (M) or a load angle of the stepper motor to be detected in a sensorless manner. A method and circuit arrangement are also provided which enable the motor current(s) of a stepper motor to be controlled in accordance with the load value such that the load angle is as high as possible without risking step losses, in order to maintain the current consumption of the motor as low as possible. This is achieved according by evaluating the temporal duration of the ON- and the FD-phases during the chopper control of the motor.
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