four-wire motor - bipolar stepper?

Thread Starter

BarryBozeman

Joined Apr 1, 2016
41
hi there -

i am attempting to repurpose an 8-track tape machine for variable speed. in other machines, i sever the main connection to a motor and install a voltage regulator. in this case, the motor in the machine is a matushita 164n034, and has two pairs of wire routed into it.

can anyone help me make sense of what these extra wires might be for and how i might control the speed of the motor?
 

AlbertHall

Joined Jun 4, 2014
8,303
It may be a stepper motor or it may be a simple motor with a speed sensor.
Some resistance readings between the wires should help.
 

Thread Starter

BarryBozeman

Joined Apr 1, 2016
41
I should add that one of the four wires is definitely connected to ground - which makes me think it's not a bipolar stepper, since there is usually a fifth connection for that, right?

What might I be looking for in my resistance readings?
 

Thread Starter

BarryBozeman

Joined Apr 1, 2016
41
Alright - having looked closer, I noticed an extra wire. Let me include a photograph and share my readings, maybe that will help with a diagnosis.

There are two pairs of wire. A red/white pair (passed through grey insulation) that seems to be hinged to the Fast Forward Switch on the chassis (which has an additional grounding wire that I missed, initially)...and a larger red/blue pairing.

The grounding wire and the blue wire are both connected and grounded.

There is a 22 ohm resistance between the red and white wires and 200 ohm resistance between the red and blue wires.

Does this indicate anything to anyone? I know nothing about this stuff.
 

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Thread Starter

BarryBozeman

Joined Apr 1, 2016
41
I should add that this is a Matushita 164N034 motor... and it is spec'd at 13.2v DC. I don't know if phase-based motors are all AC based or not.
 

MaxHeadRoom

Joined Jul 18, 2013
18,995
Does the motor turn freely or does it 'cog' when spun?
Fractional voltages, 13.2v for e.g. usually appear in stepper motors.
If it was a bipolar motor there would be identical readings between each winding.
Max.
 
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