braking single and 3 phase motors
braking single and 3 phase motors
(OP)
Need help with circuits/methods for braking single and three phase AC motors.
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braking single and 3 phase motors
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braking single and 3 phase motorsbraking single and 3 phase motors(OP)
Need help with circuits/methods for braking single and three phase AC motors.
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RE: braking single and 3 phase motors
http://www.designrouge.com/demo/qds/regen.htm
http://www.ipcresistors.com/db.htm
http://www.cressall.com/PAGES/DYNBR.HTM
http://www.cressall.com/PAGES/DBRLFLT.HTM
http://www.railpage.org.au/ausrail/98april/0138.html
http://www.filnor.com/resistors.htm
http://www.gridcom-mining.com/
etc. for more info.
RE: braking single and 3 phase motors
- Dynamic braking by application of DC to one phase of the motor after disconnecting from the AC supply
- Plugging, by reversing the motor connections to reverse the direction of rotation - needs auxiliary equipment such as zero-speed switches
Additional info is available from the manufacturers websites - check Cutler Hammer, ABB, GE etc.
RE: braking single and 3 phase motors
is it to investigate the characteristics of that motor, or maybe to decrease it's power e.t.c. ?
RE: braking single and 3 phase motors
RE: braking single and 3 phase motors
Not only that but braking may be required in an emergency in certain situations!
Regards,
Lyledunn
RE: braking single and 3 phase motors
Torque, if you need the motor to be locked solid while stationary, this might be the best way to do it.
RE: braking single and 3 phase motors
RE: braking single and 3 phase motors
These are common on machine tools where a person caught up in the rotating parts contacts a micro switch with a rod attached. My own workshop milling machine is equipped and if a sleeve is caught the vertical rod is touched and the milling head stops in less than 30 degrees, the motor may be doing 5 to 10 revs.
The hardware is a changeover switch in the line from the motor starter to the motor. When this changes over it short circuits two of the motor terminals say U & V, and connects a DC capacitor to the terminals V & W. The charge in the capacitor is adjustable and this alters the stopping time. The manufacturers recommend that a machine is not stopped too fast to avoid damage to the gears if the braking is too fierce. The changeover switch is a magnetic switch or contactor tripped by the microswitch. The circuit is on the inside of the cover, it's not too complex. One manufacturer in the UK I think is called Instastop.
James