Hi all

To complete my 24GHz EME project

Has anyone got details of the drive signal required for this WR42 switch? I only have the switch, not the controller box

I already have the pin out of it's 15 way connector and have worked out it's a stepper motor drive with 5 phases so the hardware needed is just five N channel power FETs  driven from an Arduino or similar.

What I need to know to be able to pick the right driver FETs for the job and get the pulse timing correct is as follows.

1. What pulse length, voltage and peak current is required for each phase to drive the motor round?

2. How many pulses do I need to throw at it to move it between positions?

3. Is it possible to reverse the motor by reversing the drive pulse polarity or does it just go one way round?

Jac PA3DZL kindly sent me all his available Flann data and the attached hardware driver schematic but I want to integrate the switch in to my existing Arduino TWT controller.

All help much appreciated. I will of course publish my driver and code once I've done it.  

73

John

 

  

I can tell you that "vexta"  make some 5 phase stepper motor controllers ... ideally you want PWM down each "leg" of the stepper rather than DC,  all modern stepper drives are constant current PWM ..

the sequence is usually "half step", so current down phase 1, then 1+2, then 2, then 2+3, then 3 etc in that order.  to got the other way, you reverse the order.   There are other schemes, but for a 5 phase, that will work.    You can just clock the phases at a constant speed, you need acceleration and deceleration ideally

On Tue, 4 Oct 2022 at 14:54, g4bao <john@...> wrote:

Hi all

To complete my 24GHz EME project

Has anyone got details of the drive signal required for this WR42 switch? I only have the switch, not the controller box

I already have the pin out of it's 15 way connector and have worked out it's a stepper motor drive with 5 phases so the hardware needed is just five N channel power FETs  driven from an Arduino or similar.

What I need to know to be able to pick the right driver FETs for the job and get the pulse timing correct is as follows.

1. What pulse length, voltage and peak current is required for each phase to drive the motor round?

2. How many pulses do I need to throw at it to move it between positions?

3. Is it possible to reverse the motor by reversing the drive pulse polarity or does it just go one way round?

Jac PA3DZL kindly sent me all his available Flann data and the attached hardware driver schematic but I want to integrate the switch in to my existing Arduino TWT controller.

All help much appreciated. I will of course publish my driver and code once I've done it.  

73

John