Control of 3-phase stepper motor using Power Brick LV

[GustavoGS]

Hello all,

 

I would like to know if it is possible to control 3-phase stepper motors using Power Brick LV.

 

The Power Brick LV User Manual shows motor wiring for 2-phase stepper motors and 3-phase brushless servo motors only. Can 3-phase stepper be wired the same as 3-phase brushless servo?

 

Also according to the Power Brick LV User Manual:

 

"BrickLV.Chan[j].TwoPhaseMode selects the operational output mode of the amplifier channel. If set to its default value of 0, the amplifier is set to 3-phase operational mode, using the U, V, and W output lines.

This operational mode is mainly used with Y-wound or delta-wound brushless servo motors (but 3-phase stepper motors do exist)."

 

At first, my idea was to set TwoPhaseMode = 0 and try driving the motor using the brushless motor setup.

[Omron Forums Support]

Are you intending to use the encoder or not? If not it would be best to start with the "Stepper Motors – Direct Microstepping without Encoder" example, but will the following changes:

BrickLV.Chan[].TwoPhaseMode=0

Motor[].PhaseOffset = 683

Motor[].PhaseMode = 0

I2T Protection would already be correct for a 3 phase motor in that section, but once it's updated to be correct for 2 phase you'll want to keep the cos(30) like below:

Motor[].MaxDac/I2tSet = PeakCurrentrms * 32768 * √2 * cos(30°) / MaxAdc