CN-115694267-B - Control method and device of brushless direct current motor, brushless direct current motor and storage medium

CN115694267BCN 115694267 BCN115694267 BCN 115694267BCN-115694267-B

Abstract

The application relates to a control method and a device of a brushless direct current motor and the brushless direct current motor, which are used for automatically judging the winding direction of a stator winding, determining a power pin signal of a position sensor according to the winding direction, and then detecting whether a phase difference between a phase current signal of the brushless direct current motor and an output waveform signal of the position sensor is matched or not so as to eliminate misjudgment. The stator winding of the brushless direct current motor is applicable to the same position sensor in the forward and backward winding directions, has higher universality, saves material management cost, reduces installation failure rate and improves assembly efficiency.

Inventors

Zhao Panyao
WU ZEBIN
CAO JIAORONG
DENG ZHAO
LUO PENG
QI LINGJUN

Assignees

珠海格力电器股份有限公司
珠海凯邦电机制造有限公司

Dates

Publication Date: 20260508
Application Date: 20221102

Claims (8)

1. A control method of a brushless dc motor, comprising: Acquiring a phase current signal of a brushless direct current motor and an output waveform signal of a position sensor, wherein the position sensor is used for detecting the position of a rotor of the brushless direct current motor; Judging the winding direction of a stator winding according to the phase difference between the phase current signal and the output waveform signal of the position sensor; If the phase difference between the phase current signal and the output waveform signal of the position sensor is judged to be a preset value T, the power pin signal of the position sensor is kept unchanged; if the phase difference between the phase current signal and the output waveform signal of the position sensor is judged to be T+/-180 degrees, the switching of the power pin signal of the position sensor is controlled; detecting whether the phase difference between the phase current signal of the brushless direct current motor and the output waveform signal of the position sensor is matched or not, and if the phase difference is matched and is the preset value, determining that the brushless direct current motor is normal in operation.
2. The control method according to claim 1, wherein the determining the winding direction of the stator winding based on the phase difference between the phase current signal and the output waveform signal of the position sensor includes: assuming that the phase difference between the corresponding phase current signal and the output waveform signal of the position sensor is T when the stator winding is forward wound, the phase difference between the corresponding phase current signal and the output waveform signal of the position sensor is t±180° when the stator winding is reverse wound.
3. The control method according to claim 1, wherein if a phase difference between a phase current signal of the brushless dc motor and an output waveform signal of the position sensor is detected to be not matched, winding direction information of a stator winding of the brushless dc motor is judged again.
4. A control apparatus of a brushless dc motor employing the control method of a brushless dc motor as claimed in any one of claims 1 to 3, characterized in that the control apparatus comprises: the judging unit is configured to acquire a phase current signal of the brushless direct current motor and an output waveform signal of the position sensor, judge the winding direction of the stator winding according to a phase difference between the phase current signal and the output waveform signal of the position sensor, and the position sensor is used for detecting the rotor position of the brushless direct current motor; A control unit configured to keep a power pin signal of the position sensor unchanged if it is determined that a phase difference between the phase current signal and an output waveform signal of the position sensor is a preset value T, and to control switching of the power pin signal of the position sensor if it is determined that the phase difference between the phase current signal and the output waveform signal of the position sensor is t±180°; And the detection unit is configured to detect whether the phase difference between the phase current signal of the brushless direct current motor and the output waveform signal of the position sensor is matched or not, and if the phase difference is matched and is the preset value, the brushless direct current motor is determined to normally operate.
5. The control device according to claim 4, wherein the judging unit is further configured to, assuming that the phase difference between the corresponding phase current signal and the output waveform signal of the position sensor is T when the stator winding is forward wound, the phase difference between the corresponding phase current signal and the output waveform signal of the position sensor is t±180° when the stator winding is reverse wound.
6. The control device according to claim 4, wherein the detection unit is further configured to send a signal to the judgment unit to judge the winding direction information of the stator winding of the brushless dc motor again if the phase difference between the phase current signal of the brushless dc motor and the output waveform signal of the position sensor is detected not to match.
7. A brushless direct current motor is provided, which comprises a motor, characterized by comprising the following steps: a memory storing computer program instructions; A processor, which when executed by the processor, implements a method of controlling a brushless dc motor as claimed in any one of claims 1 to 3.
8. A computer readable storage medium, characterized in that the computer readable storage medium comprises instructions which, when run on a computer, cause the computer to perform the control method of the brushless dc motor according to any one of claims 1 to 3.

Description

Control method and device of brushless direct current motor, brushless direct current motor and storage medium Technical Field The present application relates to the field of motors, and in particular, to a method and an apparatus for controlling a brushless dc motor, and a storage medium. Background With the implementation of new energy efficiency, the demand of various electric appliances for brushless DC motors is greatly increased. In order to make the brushless dc motor more efficient and less costly, it tends to be more integrated, smaller and multi-polarized. At present, a multipolar brushless direct current motor with a position sensor is provided with a stator winding, which is normally provided with a positive winding scheme and a negative winding scheme, but the same positive winding scheme and the negative winding scheme of the stator winding can lead to 180 degrees of current phase difference of the stator winding, and a motor controller with different position sensor layouts is required to be matched, so that the universalization degree is low, and the material management cost is increased. Disclosure of Invention The application aims to provide a control method and device of a brushless direct current motor and the brushless direct current motor, wherein the forward and backward winding directions of a stator winding of the brushless direct current motor are applicable to the same position sensor, so that the universality is high, the material management cost is saved, the installation failure rate is reduced, and the assembly efficiency is improved. In a first aspect, an embodiment of the application provides a control method of a brushless direct current motor, which comprises the steps of judging winding direction information of a stator winding of the brushless direct current motor, determining a power pin signal of a position sensor according to the winding direction information of the stator winding, detecting a rotor position of the brushless direct current motor by the position sensor, detecting whether a phase difference between a phase current signal of the brushless direct current motor and an output waveform signal of the position sensor is matched, and if the phase difference is matched, determining that the brushless direct current motor operates normally. In one possible implementation manner, judging the winding direction information of the stator winding of the brushless direct current motor comprises obtaining a phase current signal of the brushless direct current motor and an output waveform signal of the position sensor, and judging the winding direction of the stator winding according to a phase difference between the phase current signal and the output waveform signal of the position sensor, wherein when the stator winding is in forward winding, the phase difference between the corresponding phase current signal and the output waveform signal of the position sensor is T, and when the stator winding is in backward winding, the phase difference between the corresponding phase current signal and the output waveform signal of the position sensor is T+/-180 degrees. In one possible implementation, determining the power pin signal of the position sensor based on the winding direction information of the stator winding includes maintaining the power pin signal of the position sensor unchanged if it is determined that the winding direction of the stator winding coincides with the assumed winding direction, and controlling the power pin signal exchange of the position sensor if it is determined that the winding direction of the stator winding is opposite to the assumed winding direction. In one possible implementation, if a phase difference mismatch between the phase current signal of the brushless direct current motor and the output waveform signal of the position sensor is detected, the winding direction information of the stator winding of the brushless direct current motor is again judged. In a second aspect, an embodiment of the present application provides a control device for a brushless dc motor, where the control device includes a determining unit configured to determine winding direction information of a stator winding of the brushless dc motor, a control unit configured to control a power pin signal of a position sensor according to the winding direction information of the stator winding, the position sensor being configured to detect a rotor position of the brushless dc motor, and a detecting unit configured to detect whether a phase difference between a phase current signal of the brushless dc motor and an output waveform signal of the position sensor is matched, and if so, determine that the brushless dc motor is operating normally. In one possible implementation manner, the determining unit is further configured to obtain a phase current signal of the brushless dc motor and an output waveform signal of the position sensor, and determine a winding direction of the st