Three-phase current null drift fault detection method, motor controller and driving system
A technology of motor controller and three-phase current, which is applied in the field of motor controller and drive system and three-phase current zero-drift fault detection, which can solve the problems that the fault detection method cannot be used to detect faults, and achieve the effect of ensuring accuracy
Pending Publication Date: 2022-06-28
BEIJING ELECTRIC VEHICLE
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[0005] The technical purpose to be achieved by the embodiments of the present application is to provide a three-phase current zero-drift fault detection method, a motor controller and a drive system to solve the problem that the current traditional fault detection method cannot be used to detect faults in the normal driving state of the vehicle. detection problem
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[0061] In order to make the technical problems, technical solutions and advantages to be solved by the present application more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided merely to assist in a comprehensive understanding of embodiments of the present application. Accordingly, it should be apparent to those skilled in the art that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
[0062] It is to be understood that reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic associated with the embodiment is included i...
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The invention provides a three-phase current zero drift fault detection method and a motor control and driving system, and the method comprises the steps: obtaining a target fluctuation coefficient of a motor in a current control period and a three-phase current value detected by a phase current sampling circuit; when it is determined that the target fluctuation coefficient does not exceed the preset fluctuation range, filtering the three-phase current value according to a preset second-order low-pass filter to obtain a target three-phase current value; comparing the absolute value of the current of each phase in the target three-phase current value with a preset fault threshold value; and when the comparison result shows that the current absolute value of the target phase is greater than the preset fault threshold and the duration is greater than the preset duration, determining that the target phase has a null drift fault. According to the method, the fluctuation state of the output torque of the motor is judged to avoid fault false alarm, the target three-phase current value subjected to second-order low-pass filtering is subjected to judgment of the preset fault threshold value and the duration, and it is guaranteed that three-phase current value fault detection can be conducted in the normal running mode of the vehicle.
Description
technical field [0001] The present application relates to the technical field of motor control, and in particular, to a method, a motor controller, and a drive system for three-phase current zero-drift fault detection. Background technique [0002] Pure electric vehicle, its power comes from the drive motor, the drive motor controls it through the motor controller, and converts the electrical energy of the power motor into mechanical energy to realize the movement of the vehicle. For the drive system of the vehicle, in order to ensure that the motor outputs power according to the needs of the whole vehicle, the motor controller needs to realize the closed-loop control of the drive motor through a certain logic, and to achieve this purpose, it is necessary to be able to collect the three-phase current of the motor in real time. On the other hand, since the three-phase current of the motor is of great significance to the motor control, taking the permanent magnet synchronous m...
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IPC IPC(8): B60L3/00
CPCB60L3/0084
Inventor 李玮
Owner BEIJING ELECTRIC VEHICLE