Other Parts Discussed in Thread: DRV10963,
Can you please explain the ramifications of choosing a value of resistor in the resistor net that simulates a common lead for a 3-wire BLDC as explained in section 8.1 of the datasheet?
There it says "To find the proper resistor value, start with a value of 10 kΩ and continue to decrease by 1 kΩ until the motor runs properly." I don't understand the reasoning, and "properly" is too fuzzy.
For example, I have a motor that starts jerkily with 10k ohm resistors, but seems to start more smoothly with a 5k ohm resistor wye.
And I have another motor that sometimes starts smoothly, at other times it comes to rest at a dead spot, and won't start again (at least with the brief, low voltage pulses I give it.) Before I change other parameters, I would like to understand this parameter. For example, is 1k ohm the recommended minimum?
I also have considered using a DRV10963 but I think it requires more parts (say an MSP430) to provide a PWM signal (it won't start my motors with PWM tied high like the DRV10866 will.)
Maybe you could refer me to a book that explains 3-wire vs 4-wire and this simulation business. Also called a pseudo center-tap?
This question might be related. They seemed to have better luck with a 1k. "startup sequence intermittent..." e2e.ti.com/.../3012516