Servo amplifiers and BEMF

[RP Designs]

So I am doing my research as I get going on my project and I am trying to figure out if I need to protect the servo amps from back emf. The drives have shunt regulators which shunt the BEMF to the power supply, but since amplifiers don't have a power supply do they have a dissipative element or should I somehow protect the amp from the back emf? How is this typically done in practice?

[Al_The_Man]

Originally Posted by RP Designs The drives have shunt regulators which shunt the BEMF to the power supply, but since amplifiers don't have a power supply do they have a dissipative element or should I somehow protect the amp from the back emf?

"but since amplifiers don't have a power supply"

Generally all modern drive have a P.S. either external or internal, unless it is a SCR drive, which is not all that common, at least for new installations.
As a general design rule, most have switching devices that have reverse EMF protection built in, as well as reverse diodes fitted across the devices.
If you google simple H bridge designs you can get the idea of what is used.
Al.

[RP Designs]

Originally Posted by Al_The_Man "but since amplifiers don't have a power supply" Generally all modern drive have a P.S. either external or internal, unless it is a SCR drive, which is not all that common, at least for new installations. As a general design rule, most have switching devices that have reverse EMF protection built in, as well as reverse diodes fitted across the devices. If you google simple H bridge designs you can get the idea of what is used. Al.

Thanks Al, as always!