Need help on 8 wire stepper motor wiring

Hi,

I am trying to interface with a stepper motor, but I am having trouble with this particular stepper motor, it has 8 wires, from what I've read, it can be wired as a unipolar or bipolar (series, parallel).

The motor is a Tamagawa TS3166N913. In the nameplate it says 4.3 ohm/0.9 deg/step 400s/r

Their website no longer has the datasheet for this particular motor.

I was already able to identify which wires are paired:

gray and purple - 2.2 ohms white and red - 5.2 ohms blue and yellow - 5.2 ohms orange and black - 2.2 ohms

I tried wiring it as a bipolar parallel by connecting the following wires:

gray with white = A red with purple = A'

black with blue = B yellow with orange = B'

But when I connected it with my driver board, the motor would just jerk around.

Any suggestions?

Best wishes -Don

This bit sounds wrong:-

gray and purple - 2.2 ohms
white and red - 5.2 ohms
blue and yellow - 5.2 ohms
orange and black - 2.2 ohms

The coils should be the same resistance, it looks like you have misidentified the pairs and there are common connections to some of the coils or some of the coils have a split tapping.

Do a measurement matrix showing the resistance of all wires to all wires.

But when I connected it with my driver board, the motor would just jerk around

I assume you tried different combinations of coil connections to your driver.

Thanks for the reply, I already tried several coil connections to the driver. I will definitely look again into your suggestion of measuring again the coil resistance.

It also struck me as odd, since the resistance should have been the same all through out.

Well after googling, I found a Japanese site that uses the same motor, and has suggested that the inner 4 wires should be used:

http://members.at.infoseek.co.jp/m_vega/telescope/qcamft/control/control.htm

I've wired it as such and it seems to be doing okay, however the motor doesn't like to be driven fast, might be the limits. It would be great if a datasheet is available, but alas, this motor might just be a rarity. :(