What are the best and possible ways of controlling a DC motor speed in High-Power Applications?

[DaveElectronics6XT]

In internet it is easy to find circuits made with PMW and a transistor, but in high power application the transistor would have problems of heat dissipation/power loss, so not the best/efficient way to control the motor.

 

[rjenkinsgb]

Any properly designed PWM system, even a single ended one-transistor type, can be very efficient power-wise, but the speed is likely to vary with changes in load to some extent, without feedback control.

The efficiency depends largely on the switching speed of the power device(s).

The stages of improvement are firstly speed feedback, then in high power applications where speed accuracy is important, a full-bridge PWM control with current and speed feedback is commonly used.

The current feedback loop compensates for the torque demand and the speed feedback loop adjusts the current to maintain accurate speed.

 

[MaxHeadRoom78]

You would be better off using a Power Mosfet, with low Rds(on).

 

[schmitt trigger]

Or for even higher power, an IGBT.

 

[Tony Stewart]

It's hard these days to DIY an electronic motor control cheaper or better than mass-produced solutions.

Since motor demand is 10x on start compared to rated power, choose ESC board wisely with one that has a decent heatsink.

Avoid the bipolar types (L298N) and get a quad FET type. full bridge.

bldc motor control pcb servo -stepper - Google Shopping

 

[ZipZapOuch]

Define "high power".
What is the supply voltage and
what is the current draw for motor at full load?

 

[ramblin]

It's hard these days to DIY an electronic motor control cheaper or better than mass-produced solutions.

Can I hijack this thread ? I just built a PWM and it needs to handle a load like we are talking here. I posted about it yesterday but it never made it up or got deleted. I have lots of questions.