I'm not an electrical engineer . I would like to know whether a normal DC motor will hold the load when the power is turned off?? Or should I need to install a controller to hold the load at that position if so what kind of controller I need to install . Please help me out??
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\$\begingroup\$ for what application and how strong the DC motor must hold its position? there are several solutions, depend on the application. Alternatively, you can use servo/stepper DC motor that has 'built in' holding function \$\endgroup\$– OkaCommented Aug 24, 2015 at 7:21
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\$\begingroup\$ I'm planning for a Push load application and the payload of my system is 50Kg. We are not going for a servo or a stepper motor as it would cost high . planning for proto model with a simple DC motor \$\endgroup\$– KarthikCommented Aug 24, 2015 at 7:31
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1\$\begingroup\$ OK, for 50kg load, if the radius is 10 cm, the torque is 500 kgcm or 434 lb-in. Maybe this motor suitable: dumoremotors.com/dp500-inline-gear-motors.html There is option for an electro mechanical brake. \$\endgroup\$– OkaCommented Aug 24, 2015 at 8:01
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2 Answers
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The motor itself will not hold the load. You may need to transfer shaft power to a worm gearbox, or you may install a electromechanical brake/clutch. It depends on your application, maybe a better description would help.
answered Aug 24, 2015 at 7:12
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When power is disconnected entirely from a brushed DC motor the shaft will spin freely. If you want to lock the shaft in place then you should tie the two connections together. This will cause any motion to generate EMF in the wires that will cause the motor to oppose said motion.
answered Aug 24, 2015 at 7:00
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3\$\begingroup\$ That won't lock it in place, it'll just make it harder to turn. \$\endgroup\$ Commented Aug 24, 2015 at 8:16
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\$\begingroup\$ It also will only have an effect on a permanent magnet DC motor. For a shunt wound motor, no field = no CEMF. And anyway, it won't hold a load, you will still need a brake. \$\endgroup\$– R DrastCommented Aug 24, 2015 at 10:29