Relays

Jan 30, 2005 3 Replies

If you have a positive and a negative voltage source and a DC motor, yes. One side of motor to common, other side to relay common contact. One relay contact to positive supply and one to negative supply.

There are also AC capacitor run motors that can be reversed by connecting the capacitor to one winding and the line directly to the other that can be configured to reverse with a SPDT contact. You connect each end of the cap to each winding, and connect the common contact to the line. Then connect each of the other contacts to one side of the capacitor. The motor common winding terminal goes to the other line.

John Popelish

Dear All, I am currently completing some electronics to go into a project and would like to know whether it is possible to control a motor (reverse/ forward only) with a Single Pole Double Toggle/Throw (SPDT) relay. Thanks for any advice.



Simon Griffiths.


Only by splitting the power supply.

You could make a DPDT with 2 SPDT relays.

Do you want 'stop' as well as 'forward' and 'reverse'? If so, you must use

2 * SPDT.

I've got a diagram of a simple DC motor setup at the below link.

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