Error troubleshooting system and method for current sensors
By utilizing the current control and sensing method of three current sensors and a controller while the motor is running continuously, the fault of the current sensor can be accurately identified, solving the problem of misjudgment in the prior art and realizing accurate identification of the fault sensor and continuous operation of the motor.
CN115986685BActive Publication Date: 2026-05-26DELTA ELECTRONICS INC(CN)
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DELTA ELECTRONICS INC(CN)
- Filing Date
- 2022-04-19
- Publication Date
- 2026-05-26
AI Technical Summary
Technical Problem
Existing technology cannot accurately determine the fault type of the current sensor when the motor is running continuously, which is prone to misjudgment, and the detection during shutdown will cause the motor to stop running.
Method used
Using three current sensors and a controller, the offset of the current sensors is determined by the phase current and the sensing value. The phase current is controlled to be zero and the difference is compared to identify the first and second offset sensors. An alarm signal is output or the motor is stopped to determine the faulty sensor.
Benefits of technology
Accurately identify faulty current sensors without stopping the motor, avoid misjudgments, and ensure the normal operation of the motor.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN115986685B_ABST
Abstract
This case relates to a fault-detection system and method for current sensors, including a motor, three current sensors, and a controller. The three current sensors sense the three phase currents of the motor to obtain three current sensing values. The controller controls the three phase currents of the motor. When the sum of the three current sensing values is greater than a threshold, the controller controls the three phase currents to zero and designates the current sensor with the largest difference from zero as the first offset sensor, which has a current offset. When the sum of the three current sensing values equals the current offset, the controller designates the current sensor with the current sensing value closest to zero as the second offset sensor. If the first offset sensor and the second offset sensor are the same current sensor, the controller outputs a warning signal.
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