Monday, November 23, 2009

Servo Motor Brake


Users tend to electromagnetic braking, regenerative braking, dynamic braking of the role of the confusion, chose the wrong accessories.

Dynamic brake resistor formed by the dynamic braking, in failure, emergency stop, power outages by reducing energy consumption, servo motor brake mechanical feed distance.

Regenerative braking refers to the servo motor is slowing down or stop the energy generated when braking through the inverter circuit back to the DC bus, through the resistance-capacitance circuit to absorb.

Electromagnetic brake is a mechanical device to lock the motor shaft


Differences among the three parties

(1) regenerative braking must work properly when the server works, failure, emergency stop, power outages and other circumstances can not brake motor. Dynamic brakes and electromagnetic brakes work without power supply . Differences among the three parties

(2) The regenerative braking system to automatically carry out the work, while the dynamic brake and the electromagnetic brake work takes an external relay control.

(3) The electromagnetic brake is usually in the SV OFF start, otherwise, may result in amplifier overload. Dynamic brakes in general SV OFF or main power circuit after the start, otherwise the dynamic braking resistor may cause overheating

Select accessories Note
(1) Some systems such as transfer devices, lifting devices, etc. require servo motor stop as soon as possible. While in failure, emergency stop, power regenerative braking power when the server does not slow down the motor. At the same time the mechanical system inertia also larger then required to use dynamic brakes to select based on dynamic brake light and heavy load, the motor speed of work.

(2) Some systems to maintain a static position of mechanical devices required to provide a greater motor output torque and a longer time to stop, if you use self-locking function of servo motors tend to cause overheating or amplifier overload. This situation should choose with electromagnetic brake motor.

(3) Mitsubishi servers have built-in regenerative braking unit, but regenerative braking may give rise to more frequent DC bus voltage is too high, then need to reprovision regenerative braking resistor. Regenerative braking resistor is need for a separate distribution, with much of the regenerative braking resistor instructions refer to the use of samples. should be noted that the number of samples of braking on the list is the motor no-load data. the actual selection of the first according to system load inertia and the sample the motor inertia and inertia than calculated. longer brake on the list the number of samples divided by the (usual than 1). The data thus obtained is the number of allowed braking

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