Brushless dc motor with 5 power wires

Electric Motors and Controllers
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Lordcx   1 µW

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Brushless dc motor with 5 power wires

Post by Lordcx » Sep 23 2018 1:00am

Hi guys
I have a used brushless dc motor which has 5 power wires and 9 controll wires. I want ti use it on a mini bike but the power wires confused me as supposed the bldc motor shoud has 3 power wires not 5!. The photo of the motor and wires are attached. I also test the resistance of power wires with multimeter and 4 wires (except the white wire) have about 19 ohms with each other, while the white one has about 9 ohms with other 4 wires. Any suggestion how I can drive this motor?
Regards.
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IMAG0233-600x862.jpg
IMAG0234-600x862.jpg

Punx0r   100 GW

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Re: Brushless dc motor with 5 power wires

Post by Punx0r » Sep 23 2018 4:14am

Maybe it's a stepper motor?

If your resistance measurements are right they indicate it's very low power at 24V.

Lordcx   1 µW

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Re: Brushless dc motor with 5 power wires

Post by Lordcx » Sep 23 2018 4:40am

Punx0r wrote:
Sep 23 2018 4:14am
Maybe it's a stepper motor?

If your resistance measurements are right they indicate it's very low power at 24V.
No idea! But I think measurments were correct.
Thank you

crazymanc   100 mW

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Re: Brushless dc motor with 5 power wires

Post by crazymanc » Sep 23 2018 11:12am

My guess is it's wound like this with the white wire as the common that connects all coils to ground.

Image

Possibly at least.

Try applying a small current down two of the wires and see how it cogs.

Lordcx   1 µW

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Re: Brushless dc motor with 5 power wires

Post by Lordcx » Sep 23 2018 2:24pm

crazymanc wrote:
Sep 23 2018 11:12am
My guess is it's wound like this with the white wire as the common that connects all coils to ground.

Image

Possibly at least.

Try applying a small current down two of the wires and see how it cogs.
Thank you for the reply.
Is the figure you posted related to a conventional bldc motor or a stepper motor. Seems its wiring is similar to my motor!
Btw, when I apply low voltage (3.7v lipo high power battery) to each winding pairs, the motor start to about 10 degree of rotation or something like that and then stop.

crazymanc   100 mW

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Re: Brushless dc motor with 5 power wires

Post by crazymanc » Nov 11 2018 11:50am

Hmm, that was just for a bldc. There a couple of different configurations that these can take. Most computer fans are 2 phase, or 4 pole bldcs. That's what your motor could possibly be. 10 degrees doesn't sound particularly high for a motor with a low pole count though.

I'm wondering if the wires could be for a bldc where you have the option to wire for WYE or delta but I'd have thought that would require another lead.

Some three phase bldcs come with with 4 wires in a WYE configured stator. The extra wire being the mid point of all windings.

I'd start by measuring the resistances between the various wire combinations. Or try and open it up.

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amberwolf   100 GW

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Re: Brushless dc motor with 5 power wires

Post by amberwolf » Nov 12 2018 1:25am

Lordcx wrote:
Sep 23 2018 1:00am
The photo of the motor and wires are attached.
this search

https://www.google.com/search?num=100&n ... 5e40ywRCzc

finds this link
http://www.sciencedirect.com/science/ar ... 1-main.pdf

that has this info in the search result, probably has more info in the page itself but I can't access it.
pumped with a Model DHCR80HP dual-piston pump (Japan Servo, Tokyo, Japan) at a flow-rate of 0.6 ml/min.

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