CN-122017512-A - MOS tube damage detection method and related device of brushless motor

CN122017512ACN 122017512 ACN122017512 ACN 122017512ACN-122017512-A

Abstract

The application relates to the technical field of anomaly detection, and provides a method and a related device for detecting damage of a Metal Oxide Semiconductor (MOS) tube of a brushless motor, wherein the method is applied to a three-phase brushless direct current motor system, the three-phase brushless direct current motor system does not comprise a rotor position sensor, the method comprises the steps of obtaining a zero point of the three-phase brushless direct current motor system, obtaining current preset position information of a rotor of the three-phase brushless direct current motor system, determining the current position information of the rotor in the three-phase brushless direct current motor system according to the zero point and a current three-phase state value of the three-phase brushless direct current motor system, determining an abnormal MOS tube in the three-phase brushless direct current motor system according to the current position information and the current preset position information, and determining the abnormal MOS tube by directly judging the abnormality according to the three-phase state value under the condition of limited cost so as to improve the safety of the three-phase brushless direct current motor system.

Inventors

FENG JIANWU
LI YUBIN

Assignees

深圳市其利天下技术开发有限公司

Dates

Publication Date: 20260512
Application Date: 20260227

Claims (10)

1. A method for detecting damage to a MOS transistor of a brushless motor, the method being applied to a three-phase brushless dc motor system that does not include a rotor position sensor, the method comprising: Acquiring a zero point of the three-phase brushless direct current motor system and acquiring current preset position information of a rotor of the three-phase brushless direct current motor system; Determining current position information of a rotor in the three-phase brushless direct current motor system according to the zero point and the current three-phase state value of the three-phase brushless direct current motor system; And determining an abnormal MOS tube in the three-phase brushless direct current motor system according to the current position information and the current preset position information.
2. The method for detecting damage to a MOS transistor of a brushless motor according to claim 1, wherein determining current position information of a rotor in the three-phase brushless dc motor system according to the zero point and a current three-phase state value of the three-phase brushless dc motor system includes: Extracting a high-end phase state value, a low-end phase state value and a suspended phase state value from the current three-phase state value; determining a first position parameter according to the high-end phase state value; determining a second position parameter according to the low-end phase state value; Acquiring back electromotive force of a three-phase brushless direct current motor system; determining a third position parameter according to the suspended phase state value, the zero point and the counter electromotive force; and determining the current position information according to the first position parameter, the second position parameter and the third position parameter.
3. The method for detecting damage to a MOS transistor of a brushless motor according to claim 2, wherein determining a third position parameter according to the suspended phase state value, the zero point, and the back electromotive force comprises: Superposing the suspended phase state value and the counter electromotive force to obtain a first superposition value; And determining a third position parameter according to the first superposition value and the zero point.
4. A method for detecting damage to a MOS transistor of a brushless motor according to claim 2 or 3, wherein determining the first position parameter according to the high-end phase state value includes: If the high-end phase is in a suspended state according to the high-end phase state value, performing superposition processing on the high-end phase state value and the counter electromotive force to obtain a second superposition value; And determining a first position parameter according to the second superposition value and the zero point.
5. The method for detecting damage to a MOS transistor of a brushless motor according to claim 4, wherein determining the first position parameter according to the second added value and the zero point comprises: if the second superposition value is smaller than the voltage value corresponding to the zero point, determining the first position parameter as a first preset parameter, wherein the first preset parameter is used for indicating that the MOS tube is abnormal.
6. A device for detecting damage to a MOS transistor of a brushless motor, the device being applied to a three-phase brushless dc motor system, the three-phase brushless dc motor system not including a rotor position sensor, the device comprising: The acquisition unit is used for acquiring the zero point of the three-phase brushless direct current motor system and acquiring the current preset position information of the rotor of the three-phase brushless direct current motor system; the first determining unit is used for determining current position information of a rotor in the three-phase brushless direct current motor system according to the zero point and the current three-phase state value of the three-phase brushless direct current motor system; and the second determining unit is used for determining an abnormal MOS tube in the three-phase brushless direct current motor system according to the current position information and the current preset position information.
7. The device for detecting damage to MOS transistors of a brushless motor according to claim 6, wherein the first determining unit is specifically configured to: Extracting a high-end phase state value, a low-end phase state value and a suspended phase state value from the current three-phase state value; determining a first position parameter according to the high-end phase state value; determining a second position parameter according to the low-end phase state value; Acquiring back electromotive force of a three-phase brushless direct current motor system; determining a third position parameter according to the suspended phase state value, the zero point and the counter electromotive force; and determining the current position information according to the first position parameter, the second position parameter and the third position parameter.
8. The MOS transistor damage detection device of claim 7, wherein, in the aspect of determining the third position parameter according to the suspended phase state value, the zero point and the back electromotive force, the first determining unit is specifically configured to: Superposing the suspended phase state value and the counter electromotive force to obtain a first superposition value; And determining a third position parameter according to the first superposition value and the zero point.
9. A terminal comprising a processor, an input device, an output device and a memory, the processor, the input device, the output device and the memory being interconnected, wherein the memory is adapted to store a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any of claims 1-5.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program comprising program instructions which, when executed by a processor, cause the processor to perform the method of any of claims 1-5.

Description

MOS tube damage detection method and related device of brushless motor Technical Field The application relates to the technical field of abnormality detection, in particular to a method and a related device for detecting damage of a Metal Oxide Semiconductor (MOS) tube of a brushless motor. Background The motor drive is important as a high power module for protection. The protection is not done, the mos tube burns out when the protection is light, the mos tube is conducted up and down when the protection is heavy, and the board fires. The Mos tube protection generally has over-temperature protection, hardware over-current protection and software over-current protection. Due to cost limitation, the main control of many schemes has no comparator and operational amplifier, and has no way to make hardware overcurrent protection and software overcurrent protection. Even some schemes directly cancel current sampling and do not do overcurrent protection because of cost and board size limitations. Once the MOS tube is damaged, chain reaction is caused, the second and third MOS tubes are damaged, and finally the MOS tube is conducted up and down to cause fire, so that serious loss is caused. Disclosure of Invention The embodiment of the application provides a method and a related device for detecting damage of a Metal Oxide Semiconductor (MOS) tube of a brushless motor, which can directly judge the abnormality of the MOS tube according to a three-phase state value under the condition of limited cost and determine the abnormal MOS tube, so that the abnormal MOS tube can be determined in time in subsequent processing, and corresponding safety measures are adopted to improve the safety of a three-phase brushless direct current motor system. A first aspect of an embodiment of the present application provides a method for detecting damage to a MOS transistor of a brushless motor, the method being applied to a three-phase brushless dc motor system, the three-phase brushless dc motor system not including a rotor position sensor, the method including: Acquiring a zero point of the three-phase brushless direct current motor system and acquiring current preset position information of a rotor of the three-phase brushless direct current motor system; Determining current position information of a rotor in the three-phase brushless direct current motor system according to the zero point and the current three-phase state value of the three-phase brushless direct current motor system; And determining an abnormal MOS tube in the three-phase brushless direct current motor system according to the current position information and the current preset position information. In one possible implementation manner, the determining the current position information of the rotor in the three-phase brushless dc motor system according to the zero point and the current three-phase state value of the three-phase brushless dc motor system includes: Extracting a high-end phase state value, a low-end phase state value and a suspended phase state value from the current three-phase state value; determining a first position parameter according to the high-end phase state value; determining a second position parameter according to the low-end phase state value; Acquiring back electromotive force of a three-phase brushless direct current motor system; determining a third position parameter according to the suspended phase state value, the zero point and the counter electromotive force; and determining the current position information according to the first position parameter, the second position parameter and the third position parameter. In one possible implementation manner, the determining a third location parameter according to the suspended phase state value, the zero point, and the back electromotive force includes: Superposing the suspended phase state value and the counter electromotive force to obtain a first superposition value; And determining a third position parameter according to the first superposition value and the zero point. In one possible implementation manner, the determining the first location parameter according to the high-end phase state value includes: If the high-end phase is in a suspended state according to the high-end phase state value, performing superposition processing on the high-end phase state value and the counter electromotive force to obtain a second superposition value; And determining a first position parameter according to the second superposition value and the zero point. In one possible implementation manner, the determining the first location parameter according to the second stacking value and the zero point includes: if the second superposition value is smaller than the voltage value corresponding to the zero point, determining the first position parameter as a first preset parameter, wherein the first preset parameter is used for indicating that the MOS tube is abnormal. A second aspect of the embodiments of