Re: !956 Power window electric motor

Posted by HH56 On 2016/3/8 10:22:38

Quote:

No idea what the normal current is without measuring but I'd guess 10-15amps. If the motor is stalled as when a window is max up or down and switch is held it can be a fair amount higher. A dirty or unlubed mechanism can also increase current over the clean and lubed unit. The circuit breaker is rated at 40 amps which is probably worst case if more than one motor was operating or stalled at a time. To my mind, even though it should never be close to carrying that amount the relays should be rated preferably 40amps in case of a short. 30amp relays are common with a rated surge of 40 so should be adequate.

I don't know of any readily available mechanical relays with a "neutral" position where no output is connected. Ordinary relay contacts are either N.O. or N.C in their relaxed state so in order to use a single DPDT relay there would have to be a state where there is a neutral so the motor could be off. There may be some kind of dual coil spring centered special purpose relays where this is done but I have no idea what they would be called or where to find one. Price would probably be considerable.