ESC recommendations for variable braking

Hi all,

I’m looking for guidance in selecting an ESC.

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 RC racing 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 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!

Hi allezgrand,

What kind of motor are you looking to control exactly ? (Brushed / Brushless)
A brushless motor will not allow you for much braking effect or control.

Most of our ESC’s are brushless for UAV type motors. We do have some bi-directional versions like the RoboteQ’s:
SBL1360 60V 1x20A Brushless DC Motor Controller

:slight_smile:

Hi DiaLFonZo,

It’s a brushless motor. Shouldn’t there be relatively easy ways to make it continuously brake at different levels? For example, with a 3 phase AC motor, it is possible to apply a small DC voltage across any 2 phases and it will cause resistance. Increase the voltage (amperage increases with it, of course) and the motor will experience more resistance. Why can’t this be done in a DC motor as well? Or, if you don’t want to reduce the efficiency of the MOSFETs, advance the phase angle of the drive to the point where you get just slightly passed the current position of the motor so that it drives it backwards - more advance, to a point, would drive it backwards even harder. Does nothing like this exist in an off the shelf speed control?

How does the braking work on ESC’s that do have braking?

Thanks for your help!

What i mean is the brake will be weak (not really powerful). The RoboteQ feature a regenerative braking system.
sbl13xx_datasheet v1.1 2018.pdf (1.11 MB)