Method, device and motor controller for detecting phase loss of motor stator winding
A motor stator and lack of phase detection technology, applied in the field of detection, can solve the problems of easy misjudgment, zero or close to zero time, inaccurate detection results, etc., and achieve the effect of improving accuracy
Active Publication Date: 2022-07-15
北京动力源新能源科技有限责任公司
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Problems solved by technology
However, when the motor is working normally, the voltage applied to the motor winding is a sine wave, and the sine wave itself has many times when the current value is zero or close to zero. In this way, it is easy to misjudgment when detecting the lack of phase of the motor. , making the test results inaccurate
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[0033] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0034] It should be clear that the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0035] figure 1 It is a simplified schematic diagram of the connection between the motor controller and the three-phase windings of the motor. In the drag system, in order to meet the load requirements of the motor when the motor is working, a specific voltage needs to be applied to the stator windings of the motor, so that the stator air gap can be adjusted. A rotating magnetic field is formed inside, which then drives the rotor to rotate at a specific speed. However, with the change of the loa...
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The embodiments of the present application disclose a method, a device and a motor controller for detecting phase loss of a stator winding of a motor, which relate to the technical field of detection, and are invented to improve the accuracy of phase loss detection of a stator winding of a motor. The method includes: acquiring a sequence of instantaneous current values flowing through a first corresponding winding of the motor stator in a current control period; acquiring a comparison value of the first corresponding PWM wave inversion in a current control period and the PWM wave The period value of ; determine whether the ratio of the comparison value and the period value is between the first threshold and the second threshold; if the ratio is not between the first threshold and the second threshold, then calculate the current instantaneous value sequence, the continuous occurrence of current The number of instantaneous values between the third threshold and the fourth threshold; determine whether the number is greater than the predetermined number; if the number is greater than the predetermined number, it is determined that the first phase has a phase loss fault. This application is suitable for phase loss detection of motor stator windings.
Description
technical field [0001] The present application relates to the field of detection technology, and in particular, to a method and device for detecting phase loss of a stator winding of a motor, and a motor controller. Background technique [0002] As an important part of the traction system, the motor has been widely used in all walks of life. During the operation of the motor, once the motor phase loss fault occurs, problems such as serious jitter, power drop and noise increase may occur. In more serious cases, it may even lead to a short circuit of the motor, and then the motor will be burned due to excessive current and excessive heat generated by the motor, which will have a serious impact on the entire drag system. In order to avoid the occurrence of serious consequences caused by the lack of motor phases, in the prior art, the current in the motor windings is detected by setting a current sensor. Phase failure. However, when the motor is working normally, the voltage a...
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IPC IPC(8): G01R31/34G01R29/16H02P27/12H02P27/08
CPCG01R31/346G01R29/16H02P27/12H02P27/085
Inventor 李岷舣金会明康爱红
Owner 北京动力源新能源科技有限责任公司