What Causes the Motor Not to Rotate?

[IsabellaMarie]

Motor failure to rotate is generally caused by blown fuses, accelerator malfunctions, or damaged power switches. The solutions for motor rotation failure are as follows: Check the throttle signal voltage: If the throttle source 5V voltage is normal, check the throttle signal voltage. When rotating the throttle, the signal voltage should change from low to high. If the voltage does not change and remains below 1V, it indicates a throttle fault or a short circuit in the throttle wire. If the voltage is above 1V and changes normally, proceed to check the motor Hall signal. Check the motor Hall signal wires: Inspect each motor Hall signal wire separately. Slowly rotate the motor by hand, and the voltage for each phase should vary between 0 and 5V. If the voltage does not change, the motor Hall sensor is damaged, and the electric vehicle motor or motor Hall components should be replaced. If each phase voltage changes normally and the power supply is functioning correctly, the controller is likely damaged and should be replaced. Use a multimeter to test the controller: Measure the voltage at the controller's power input terminal with a multimeter. The voltage should be greater than 36V. If there is no voltage, inspect the input wires. Check the throttle power supply voltage of the controller; the normal voltage range is 5–6V. If there is no 5V voltage, unplug the throttle socket. If the voltage returns to 5V, the motor Hall components may be short-circuited. If there is still no 5V voltage, the controller is faulty and should be replaced.

[StAlice]

As a seasoned driver with years of experience, I've encountered quite a few issues with non-functioning electric motors. The most common problem is power-related, such as a weak or aging battery that doesn't supply enough current, resulting in a humming sound but no movement during startup. Additionally, blown fuses can cut off the current, usually located in the fuse box with clear markings. I once had an issue where the trunk motor wouldn't work, and it turned out to be a blown fuse—replacing it fixed the problem. Motor-specific issues, like burnt internal coils or a seized rotor, are often caused by overuse or water ingress; moisture can oxidize and rust the contacts, affecting connectivity. I recommend checking the battery health every three months and avoiding parking in waterlogged areas. If the motor makes unusual noises, stop using it immediately to prevent minor issues from escalating. Regular maintenance of the electrical system is key—have a professional shop test the voltage with proper equipment to ensure safe driving.

[OLondyn]

Last week, the window motor in my car suddenly stopped working, and the window wouldn't go down. I thought it was broken and needed a major repair, but after checking the manual, I found it was just a small fuse that had blown. A few bucks for a new fuse fixed it. The cause could be as simple as poor switch contact or aging wiring; more complex issues might include relay failure or control module errors. My neighbor once had a starter motor burn out, which was expensive to fix, caused by frequent ignition attempts leading to overheating. When driving, be mindful not to operate motorized functions for extended periods to avoid overheating. If you notice something isn't working, first check the fuse and power connections—don't panic. Regular maintenance should include cleaning electrical components to prevent rust and dust buildup, extending their lifespan.

[MacMax]

I've just started learning car repair, and my experience with motors not turning is still fresh. My master always tells me to listen first: if there's a buzzing sound but no movement, it might be mechanical jamming or too heavy a load; if there's no sound at all, check the power supply end, like loose battery connections or a blown fuse. Simple faults can be fixed by yourself, but complex ones like internal short circuits require disassembly for repair. The reasons vary, from insufficient voltage to damaged switches. During the apprenticeship, don't be afraid to make mistakes; practice more to become proficient. I remember once a customer's car horn didn't work, and it turned out to be burnt relay contacts—replacing it solved the problem. For beginners, it's recommended to use a multimeter to check if current is flowing; basic troubleshooting is quick.

[Ariana]

As a family user with children, I am particularly concerned about car safety issues. For example, if the seat adjustment motor fails to operate, it might trap a child, which is dangerous! Common causes include oxidation or disconnection of wiring connectors or corrosion due to moisture; in extreme cases, such as high temperatures triggering motor protection, it will automatically stop to prevent overheating. I have developed the habit of visually inspecting the electrical parts of the vehicle every month to address any issues early. During maintenance, I ask the technician to test the battery and grounding wires. If the motor stops working, I immediately park and seek help instead of forcing the car to drive. For prevention, avoid overloading the motor functions for extended periods and ensure proper ventilation for heat dissipation.