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CCS/DRV8303: DRV8303

Part Number: DRV8303
Other Parts Discussed in Thread: INA181,

Tool/software: Code Composer Studio

I'm having an issue with a motor controller solution.

We started with TIDA design 00285 and replaced the internal current sense from the DRV8303 with two INA181 devices.

The motor runs rough at low speeds and when increasing the DC-Link Voltage instaspin incorrectly increases the motor speed. Seems like some sort of feedback issue when measuring the phase current.

So at 6V the motor tries to spin, roughly and as I increase past 7V it syncs to some random frequency that it is reported on gMotorVars.Speed_krpm.

Naturally the motor is halted.

Any ideas for what may be causing this behavior? I tried to change the PWM frequency and increase the value of the smoothing capacitors for the phase voltage reading without success.