How to lock a d.c motor at its position when power is turned off to the motor?

I have an application where a d.c motor drives a spring connected load. When power is given to the motor, it actuates the load. When power is put off, the rotor must be locked. What type of motor to be used?

Answer:
clutch, brake, not really a lot of difference there, both use a friction surface, springs and an electromagnet, but it your case you probably want a brake, specifically a spring operated, electrically released brake. However, it is possible a simple ratchet might work, do you literally need the motor "locked" or just prevent back driving? I'm not clear on what "spring connected load" means, or what kind of power levels you are using.

Look for a DC motor with a clutch mechanism

Check the following websites to see if they have the information you are looking for:

http://www.ems-limited.co.uk/products.ph...
http://www.epanorama.net/links/motorcont...

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How to lock a d.c motor at its position when power is turned off to the motor?

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