u/Brief-Blueberry-7445

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I’m using a 36V 400W BLDC motor for an outdoor sliding gate, and I’ve noticed that during colder mornings (around 5–8°C), the motor sometimes struggles to start when the gate is under load. Instead of rotating immediately, it just hums for a few seconds and then usually starts after 2–3 attempts. Once it gets moving, the system runs normally and there are no controller fault codes.

Setup:

36V BLDC motor (400W)

Hall sensor feedback

Outdoor sliding gate (~60kg)

36V 20A driver/controller

I already checked the gate rail friction, battery voltage, and Hall sensor wiring, and everything seems normal. Battery voltage stays stable around 37V even during startup attempts. I’m wondering if this could be related to lower startup torque in cold temperatures, current limiting from the driver during startup, or maybe mechanical stiction in the gearbox when cold. Has anyone dealt with similar cold-start issues on outdoor BLDC systems?

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