@bdsargent The transformer is mounted to an weatherproof 2-gang junction box, with holes drilled in the cover for the wires and mounting screws. Inside the box are a couple terminal strips and four high-current diodes soldered together to create the bridge rectifier.
The switches are in a single-gang weatherproof box. The two cables between transformer box and switch box are 3-conductor 14-gauge SO cable; one for mains power and one for the +/- 12V switch.
Under the red cover is a SPST switch that switches the mains voltage to the transformer primary.
The transformer is 24V center-tapped. A bride rectifier sits across the secondary, yielding +/- 12V with respect to the center tap (CT). The CT is wired directly to one side of the motor. The other switch is a momentary SPDT that connects the other side of the motor to the + or - side of the bridge.
I believe I got it from mpja.com. They deal in surplus stock, and it doesn't look like they have it any more. Any high-torque worm-drive reversible motor will do. Be aware that some worm drives can be driven by the output shaft, so you may need to rig some sort of locking mechanism.
@bdsargent The transformer is mounted to an weatherproof 2-gang junction box, with holes drilled in the cover for the wires and mounting screws. Inside the box are a couple terminal strips and four high-current diodes soldered together to create the bridge rectifier.
The switches are in a single-gang weatherproof box. The two cables between transformer box and switch box are 3-conductor 14-gauge SO cable; one for mains power and one for the +/- 12V switch.
Lotharyx 5 months ago
@bdsargent Here's a basic description:
Under the red cover is a SPST switch that switches the mains voltage to the transformer primary.
The transformer is 24V center-tapped. A bride rectifier sits across the secondary, yielding +/- 12V with respect to the center tap (CT). The CT is wired directly to one side of the motor. The other switch is a momentary SPDT that connects the other side of the motor to the + or - side of the bridge.
Lotharyx 5 months ago
I'm inspired. How did you construct the switch and controller?
bdsargent 5 months ago
@rakishi18
I believe I got it from mpja.com. They deal in surplus stock, and it doesn't look like they have it any more. Any high-torque worm-drive reversible motor will do. Be aware that some worm drives can be driven by the output shaft, so you may need to rig some sort of locking mechanism.
Lotharyx 1 year ago
I just bought that hoist... where did you buy the motor?
rakishi18 1 year ago