Looking for help with sourcing speed controller with variable braking

Electric Motors and Controllers
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allezgrand
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Joined: Feb 12, 2018 2:59 pm

Looking for help with sourcing speed controller with variable braking

Post by allezgrand » Feb 12, 2018 3:05 pm

Hi all,

I’m looking for guidance in selecting an electronic speed controller for a BLDC motor. This isn’t for an electric vehicle, but this seems like the best group to ask since you all tend to have the most experience with and knowledge of BLDC motors.

I’m looking for an ESC with forward, reverse, and variable braking which I can control using a microcontroller (virtually any hardwired input signal (PWM, PPM, 0-5V, etc.)).

For braking, I’m looking for one of two options, or ideally, both:

A) If you imagine a heavy car going downhill, I’d like to apply the brakes so that it moves at 5 mph, 10 mph, or 20 mph, depending on the signal the ESC receives.

B) I’d like to be able to resist a fixed amount which I can vary. If you imagine a car going into a turn, you want to be able to brake a different amount depending on the track conditions and the point in the turn. For example, I want to be able to vary the resist from 10 Nm to 100 Nm. I’m guessing this would be common in the electric car world, but I don’t know.

For forward or reverse, I’d like to be able to set the RPM based on the PWM signal such that as the load varies, the motor speed does not. Is this commonly the way they are setup, or does the PWM signal from a receiver typically control power from 0-100% instead of RPM?

The motor I’m controlling will be using a 24V power supply with a maximum load of 10A. It is 4 pole and equipped with a hall effect sensor. The range will be 120 to 480 RPM. Any help or direction you can offer is greatly appreciated!

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