I have a window motor (open/close) single polarity. I’d like to use two magnetic reed switches to open and close motor. When magnet is applied to one reed switch, it would open. When applied to the second reed switch, it would close. Obviously when no magnet is applied it would do nothing

can somebody assist with a wiring diagram?

 

Motor voltage and current ratings - ? Reed switches cannot handle much current, so you probably will need two relays.

ak

 

Motor voltage and current ratings - ? Reed switches cannot handle much current, so you probably will need two relays.

ak

12v- current unk(used in car)

 

Three approaches:

1. Two reed switches, each SPDT, rated for a low current that is enough to run the motor.

2. Two reed switches, each SPST, each controlling a SPDT relay rated for a higher current.

3. Two reed switches, each SPDT, each controlling two power MOSFETs.

Note: Digi-Key has SPDT reed switches rated as high as 3 A.

ak

 

OK, current still unknown, it might be up to ten amps. The very confusing statement: " I have a window motor (open/close) single polarity. " is what that means. At one time there were 3-wire window motors that used a separate feed for each direction. So reversing polarity did not reverse directions. That made the switching function much simpler. BUT now we knowthat it is a 12 volts DC motor, most probably 2-wires . So two relays are required, each relay coil operated by one reed switch. The two motor connections would go to the two relay "common" (wiper) terminals, both of the 2 relays N.O. contacts to +12 volts, and both the 2 relays N.C. contacts to the negative 12 volts supply. The benefit of this scheme is that operation of both relays at the same time will not cause any problems.