Our company has two 3.7KW motors with gearbox while dragging the product in high-speed rotation, include four big wheels in drive system, with large inertia in stop status, the original design of the two electric motors have no brake function, just add cooling fan in the motor end. Now while the control output disconnect but the ac motor still has high-speed rotation and need some time before it stopped, it will impact the next product scheduled in work.

Now our company want to introduce a frequency inverter to control it, is it output can brake quickly?

is it better to install two inverters for braking, or install an inverter to drive the two electric motors? I think the frequency inverter can make the ac motor stopped in 2s with no external brake connected, right?

If the load is heavy and large inertia, you need to add a braking resistor to make it stopped in a short time, of course, you have to set the DC brake.

Usually the inverter below 15KW is built-in brake unit, but many manufacturers are not equipped with braking resistor, only if customer asked or install by themselves.

You can try two ways, one is to use the the inverter relay output function, set the relay to brake or actions in a certain frequency range to control the brake; Another is DC braking (add brake resistor), you should pay attention to the acceleration / deceleration setting time, otherwise it will cause an over current fault.

It simple to find a braking resistor connect to the inverter, parking mode set to deceleration brake. The specific resistance power, it's different between every inverter manufacturer, you can check frequency inverter user manual.

The best solution is add brake in the mechanical part, if it's not easy you should install brake resistor on the inverter drive, in this case, your inertia force is so big, it maybe not safe enough.