Initial angle detection in stand still
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United States of America Patent
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Apr 24, 2018
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app pub date -
Aug 18, 2016
filing date -
Sep 22, 2015
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Abstract
An apparatus and method for determining initial rotor position in a stationary state of an electric machine. The apparatus and method for determining initial rotor position in a stationary state of an electric machine include: a power supply module being used for supplying power at least to a motor; a switch circuit being used for switching motor power supply modes, wherein each power supply mode corresponds to a different electrical angle; a feedback circuit detecting a motor winding current and generating a corresponding feedback signal to feed back to a controller; and the controller determining a rotor angle on the basis of currents passing through the motor in different power supply modes, wherein the controller performs the following operations: (a) weighting and then comparing fed-back current values of currents passing through the motor in different power supply modes; (b) based on a maximum current value and current values for two power supply modes before and after the power supply mode corresponding to the maximum current value, calculating a position angle PA corresponding to the position of the maximum current value by using a similar triangle approximation method.
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