Possibility of driving 8 wire stepper motor with two TB6560 drivers ?

Hi All,

I have an 8 wire stepper (57HZ84-20) rated as 16kgcm, 3A/phase(I guess per winding) and is working with a TB6560 driver in series 2 phase mode. Is there a possibility of driving the motor with two TB6560 drivers in parallel to get more torque? i.e. each pair of windings is driven by each driver (not paralleling the outputs of drivers directly). TB6560 is a 3A/phase chopper driver.

Thanks in advance.

I haven't tried such a thing, but I have serious doubts about the feasibility of that approach. The two drivers will not be synchronized to each other. I would expect strong mutual coupling between the windings to cause all sorts of problems in the driver circuitry, and they would likely end up fighting each other rather than reinforcing each other.

Have you considered trying wiring it for bipolar parallel operation? The motor specs are a bit ambiguous because unlike some motor datasheets they do not specify rated current for different wiring configurations, so the 3A spec is somewhat questionable.

Thanks doorknob. I tried it last night. There was an unusul little noice from the motor. One driver got bit hotter, but the motor did rotate. I did not measure the torque actually. better not going that way.

Motor can be run in bipolar parallel mode, but the driver only put 3A max. i.e. 1.5A per winding. Thats what I am worrying about. But that way I was able to get more speed than bipolar series mode.

3 amp per phase does not necessarily per coil. Did they specify which mode the rating is for? (ie: bipolar series, bipolar parallel, etc)

Nameplate says 3A 1.8'. The manual says 3A/phase. I have already applied 3A per coil and there is no heating at all, motor works properly.