Short circuiting motor leads for emergency stop braking
Short circuiting motor leads for emergency stop braking
(OP)
Hello,
I'm working on an application where a permanent magnet DC motor is used to power an electrical vehicle.
For safety purpose I want to short circuit the motor leads when an emergency stop is activated.
Can someone tell me whether I can do this (just short cicuiting the motor) or do I have to provide a braking resistor to dissipate the power during short circuit.
If I have to use a resistor how can I determine/calculate the exact resistorvalue?
Thanks for any help,
Andy
I'm working on an application where a permanent magnet DC motor is used to power an electrical vehicle.
For safety purpose I want to short circuit the motor leads when an emergency stop is activated.
Can someone tell me whether I can do this (just short cicuiting the motor) or do I have to provide a braking resistor to dissipate the power during short circuit.
If I have to use a resistor how can I determine/calculate the exact resistorvalue?
Thanks for any help,
Andy





RE: Short circuiting motor leads for emergency stop braking
RE: Short circuiting motor leads for emergency stop braking
RE: Short circuiting motor leads for emergency stop braking
have you thought of using a clutch/brake system?.. by re-designing some circuitry you can activate brake system to work as an E-stop. i don't know how you want the system to work..i hope you can tell us more details
dydt
RE: Short circuiting motor leads for emergency stop braking
Regards
John
RE: Short circuiting motor leads for emergency stop braking
-Nathaniel
RE: Short circuiting motor leads for emergency stop braking
The dynamic brake resistor value should be sized to provide a current less than the peak rated current of the motor when the motor back EMF voltage at full speed is applied to it. Since we are dealing with a temporary load, the resistor should be pulse rated. This will allow a lower wattage rating than would normally be implied by the current through the resistor. The relative frequency of braking would be limited by the wattage rating of the resistor.