Method for ascertaining a commutation angle
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United States of America Patent
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Jul 11, 2017
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N/A
app pub date -
Dec 1, 2015
filing date -
Dec 5, 2014
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Abstract
In a method for ascertaining a commutation angle in a permanently excited synchronous motor, the commutation angle indicates the position of a rotor within a magnetic period of the synchronous motor and is used for the field-oriented energization of the synchronous motor. The method includes the steps of specifying a random commutation angle as starting point of the method, impressing a current vector into the motor using the initially randomly specified commutation angle, ascertaining a positional deviation of the rotor, varying the commutation angle used for the energization with the aid of a controller structure in order to counteract the ascertained positional deviation, so that the commutation angle that comes about after a stabilizing period corresponds to the actual commutation angle of the rotor, an initial speed of the rotor being taken into account when ascertaining the positional deviation of the rotor.
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