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What does it mean by " Brake " in VFDs ?

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munzir

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What does it mean by " Brake " in VFDs ?

Why do we need to utilize " Braking " in VFDs ?

Can it be utilized both in AC Drives & in DC Drives ?

thanks
 

What does it mean by " Brake " in VFDs ?
Why do we need to utilize " Braking " in VFDs ?
Click to expand...


This lesson covers the parts that make up the
Variable Frequency Drive (VFD) and describes
the basic operation of each part.

**broken link removed**

Can it be utilized both in AC Drives & in DC Drives
Click to expand...

Principle is same braking motor act as generator and produce energy
to the Intermediate Circuit (DC Link)
this energy must be controlled either by the brake resistor or fed into the power grid.
 
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    munzir

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kak111 said:
This lesson covers the parts that make up the
Variable Frequency Drive (VFD) and describes
the basic operation of each part.

**broken link removed**



Principle is same braking motor act as generator and produce energy
to the Intermediate Circuit (DC Link)
this energy must be controlled either by the brake resistor or fed into the power grid.
Click to expand...


how many types of Brakes are used in VFDs ?
which types correspond to what application and/or what needs ?

thanks
 

there are mechanical brakes, like in your car with pads, and there are electronic brakes like kak111 mentioned and is commonly found in hybrid vehicles.

the electronc break means to drive the motor in reverse while the motor is actually spinning in original direction .. (like throwing a car in reverse on the highway and hitting the gas). there is a tremendous amount of energy that has to be transfered from the motor back towards your power electronics.. i.e. motor starts acting like a generator. and if you can find a way to re-direct this energy (like recharging a battery) and/or burn it off in a resistor, then your electronic brakes can work. this is called "dynamic braking" which should help your google searches.

Mr.Cool
 

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