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How to judge whether the motor is good or not without turning on the motor?

How to judge whether the motor is good or not without turning on the motor? Sima motor summarizes the following experiences and shares them together: 1. Ecpu (or controller) disconnects all battery access lines and phase lines. 2. When the multimeter is pulled to the diode gear, it is usually in the switch gear, while the automatic meter is in the resistance gear (switch with the function key). This gear has a diode triangle and a bar symbol. 3. There is a diode in any metal oxide semiconductor tube. If the metal oxide semiconductor tube burns, the diode will surely burn. Therefore, the quality of MOS transistor depends on the quality of diode. Use the following procedure to measure the diodes. The stable voltage of the multimeter is about 0.35 ~ 0.5V, which indicates that the metal oxide semiconductor tube has good performance. If 0V voltage is displayed, the metal oxide semiconductor tube is broken down. If the displayed voltage is higher than 0.7V, the metal oxide semiconductor tube breaks. 4. For the three-phase metal oxide semiconductor tube on the upper arm of the controller part, the black contact pin is connected to the positive access wire of the secondary battery (the pure controller is connected to the positive wire), and the red contact pin measures the three-phase wire respectively. 5. For the three-phase metal oxide semiconductor tube on the lower arm of the controller, the red contact pin is connected to the negative access wire of the main battery (only the controller is connected to the negative wire), and the black hair measures the three-phase wire respectively. 6. The main battery of ecpu is connected in parallel with the metal oxide semiconductor tube. The black probe is connected to the positive access line of the secondary battery, and the red probe is connected to the positive access line of the main battery. 7. The ecpu secondary battery is connected in parallel with the metal oxide semiconductor tube, the black probe is connected to the negative access line of the secondary battery, and the red probe is connected to the negative access line of the main battery. 8. The ecpu is connected in series with the metal oxide semiconductor tube, and the black probe is connected with the positive pole of the main battery.

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