Recent content by q747

  1. Q

    How to find motor poles on motor with incremental encoder?

    I have a surface magnet PMSM motor with an incremental quadrature encoder. I'm implementing a motor controller using field oriented control, and I need to establish the initial position of the rotor magnets. What's the best way to do this? The hardware consists of three half-bridges, each...
  2. Q

    Need Help with Space Vector PWM

    Thanks, oneye14. I think I have the DC offset under control now. There's another thing I don't quite understand, but I'll create a separate post for that.
  3. Q

    Need Help with Space Vector PWM

    This scope shot shows what the waveforms look like when I generate them using lookup tables rather than using SVPWM. They extend nearly all the way down to 0V.
  4. Q

    Need Help with Space Vector PWM

    This is for a motor control application of low-voltage (12-24v) PMSM motors. The hardware consists of six MOSFETs in three half-bridges with each half-bridge connected to one of the motor phases. Below is the schematic of the Infineon board I'm using to test this. The DC rail voltage on this...
  5. Q

    Need Help with Space Vector PWM

    I forgot to mention how I'm measuring the SVPWM waveforms with a scope in my original post. I've disconnected the motor from the control board and substituted the simple test fixture shown in the diagram below and have the scope probes connected to the test points indicated.
  6. Q

    Need Help with Space Vector PWM

    I'm building a board to control a three-phase PMSM motor. I believe I have most of the control code implemented and working, except that my SVPWM algorithm generates a DC offset of 8v. I'm not sure what causes this and would like to eliminate it. As a comparison, I also implemented a straight...
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