Running a stepper motor and induction motor is braking

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Barlioh
Posts: 4
Joined: Sun Sep 11, 2016 10:59 pm

Running a stepper motor and induction motor is braking

Postby Barlioh » Tue Nov 29, 2016 2:25 am

I am running an induction motor and a stepper motor simultaneously through a driver board I designed. The board has a dual H-bridge for driving a bipolar stepper motor, and an inverter for driving the induction motor. The DC voltage supplied to the dual H-bridge and the inverter comes from a bench supply, which is 25 Vdc. The bench supply supplies another 11 Vdc to the gate driving ICs (IR 2112S).
IR2112S datasheet for your reference:http://www.kynix.com/uploadfiles/pdf9675/IR2112S.pdf
The gate driving signals come from a micro-controller board, which also has the run-profile for the two motors including other logic.

Both motors run almost perfectly individually, and when running simultaneously, they work fine during acceleration and steady state phases of the program/recipe.

However there comes a time during the program/recipe when the stepper motor is running at full speed (max rated) and the induction motor starts to decelerate/brake. At a very specific point during the deceleration (almost precisely) the stepper motor (which was running fine at full speed stalls.

I can't find anything wrong with the program logic, so I am thinking of an electrical problem. I initially thought it could be crosstalk in the two sets of motor driving signals. But the stall comes at too specific a time to be just crosstalk.

My current theory is the current generated due to braking by the induction motor, becomes too large and interferes with the stepper motor. But I am not sure how to test and rectify this.

Any ideas would be welcome.

om_tech_support_JS
Posts: 148
Joined: Tue May 10, 2016 4:48 pm

Re: Running a stepper motor and induction motor is braking

Postby om_tech_support_JS » Fri Dec 02, 2016 3:08 pm

Hi Barlioh,

It sounds like the braking of the induction motor is pulling more current to the induction motor and the stepper drive lost current control. This is one of the key factors to consider when a stepper driver is designed. Please refer to the circuit diagram on page H-38 (electronically page 5) of our general catalog linked below:
http://orientalmotor.com/products/pdfs/ ... ations.pdf

We cannot advice more detail than this regarding how to make the constant current circuit. For your reference, we do offer our CVD driver. The CVD driver offers the lowest vibration and noise and is offered either as the driver only or as a package which includes a stepper motor. Please review the link below for some key points on the CVD 2-phase bipolar driver:
http://www.orientalmotor.com/video/step ... s-cvd.html


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