Part Number: DRV8353RH-EVM
Me and my team think about DRV8353 chip, because he have option 1x PWM (save MCU and development time).
After test TI DRV8353rh demo and compare it to DRV8353RH with 1x PWM option - We found that the motor in 1x PWM mode make a lot of noise.
DRV8353RH TI demo setup: include DRV8353RH-EVM board + ISO-F28027F (as controller in 3x PWM mode) + "DRV8353Rx 1.0.1" software - the motor run very well and very quiet.
DRV8353RH with 1x PWM setup: include DRV8353RH-EVM only (R48 R50 R52 with 0 ohm, remove R31, remove R23), PWM 40Khz 20% duty cycle 3.3V, INCH and INLC connect to 3.3V - a lot of noise and isn't possible to build project with DRV8353 1x PWM option.
Thanks for posting on the MD forum!
Is it possible that you have the hall sensors and motor phase wires misaligned? Can you send a scope waveform of the hall sensor output and SHx node together?
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In reply to Adam Sidelsky:
First of all, thank for your quick answer.
4 files attached
1. PWM in INHA pin - pwm.PNG
2. SHA vs hall A - a.PNG
3. SHB vs hall B - b.PNG
4. SHC vs hall C - c.PNG
In reply to Niv Calif2:
Did you get this motor with Halls included? If so what is the model number of the motor?
Here is the type of waveform we usually see:
As shown above, there is a period of High-Z before and after the phase is driven. The hall sensor goes active (active low) and the phase is driven at the same time.
In your plots we only see the High-Z period before the hall sensor goes active and the phase is driven. After the phase is driven we do not see another High-Z period for some reason.
Some debug steps:
Another user on the forum had a very similar issue to yours where only one side of the BEMF was showing when we expect to see BEMF both before and after the phase is driven.
They found that their hall sensors were misaligned and correcting this fixed the issue. Please see their post here:
Yes Adam, I saw it yesterday, its help me and now the motor run very wall.
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