Some issue about make a PMSM driver base on ODrive

1

Hi guys

I want to control a PMSM with the ODrive.

The spec of the PMSM is below
Rated input voltage: 60V (I guess this value is phase voltage not VDC)
Rated rev.: 3000RPM
Rated output: 200W

However, I am facing three problems.

  1. Could I just series two 48V power supplies to get higher voltage?
    Like the first fig in this link.
    Because when Vbus = 40 V, the speed is only 20 RPS.
    And I want to use 100V Vbus to reach 50 RPS.
    (I know I need to replace the gate and gate driver first)

  2. How much the max phase voltage ODrive can output?
    I saw this post said ODrive could output 16.6V line voltage with 24V Vbus.
    Base on line voltage = sqrt(3) * phase voltage. The phase voltage = 9.6V.
    But I also find some papers said the phase voltage = 1/2 * 1.15 * Vbus.
    Consider about leave 20% duty cycle for measuring the current.
    the phase voltage = 1/2 * 1.15 * Vbus * 0.8 = 1/2 * 1.15 * 24 * 0.8 = 11V.
    which value is correct? 9.6V or 11V?

  3. Could I buy a STM32F405 MCU and flash it with v0.5.4 firmware?
    because I want to make a custom board but I heard the newest firmware can’t compatible with it.

2

Newest firmware compiles and works with custom boards.
Which mosfers and gate drivers do you want to install for 100v operation?

3

Thanks for your reply.

I am very happy that newest firmware work with custom boards.
Because the communication interface in ODrive is really convenient.

I haven’t yet decided. But following other evaluation board is easier to me.
Ex. The IGBT STGIB15CH60TS-L (STEVAL-IPM15B power board).