I’ve used the DRV8834 for a number of projects, never had troubles. But now when I’m driving some steppers from NMB (PG15S and PG25), both gearbox motors have trouble going above a very embarrassing low pulse rate.
I always assume my work is the problem first, so I’ve checked a lot of things. First is a picture of my setup. I’m confident the wiring is right because low speed settings make the motor function.
For low speeds, like if commanded 250pps, the motor performs nicely, it rotates the correct angle and everything is great. But then when I do the 1k pps setting, or even 500 pps, the motor hiccups as the pulse period is decreasing to its shortest (i.e. when getting to the high speeds). This happens with both of these motors.
I’m pretty sure it can’t be a current limit issue, the motors are unloaded, and I can monitor the current from the motor controller.
What should I test next to try and figure out how to handle the hiccups?