# BLDC 3 Phases Motor wiring

I have a BLDC 3 phase 8 pole motor, with hall effect sensors, most other three phases motors have 1 wire for each phase U , V , W however this motor has two for each phase(these do not include the separate hall effect sensors, of which there are 5 as expected). Does any one know the reason for this, I have attached the motor specification sheet.

Best Regards

JW

• This way it's easy to connect them to isolated inputs: completely separate plus and minus. Personally i like it very much. Although you definitely have a datasheet of something else. – Gregory Kornblum Feb 12 '16 at 18:16
• Thank you for your response, however your reply is very vague, and I am unsure what you mean about the datasheet this was provided by the manufacturer with the motor. why would you need isolated inputs plus/minus for each phase??? – James Weston Feb 12 '16 at 18:25
• You know, it happens sometimes :) either the motor is not what is described in DS, or you didn't describe correctly the situation. – Gregory Kornblum Feb 12 '16 at 18:28
• As the datasheet suggests, it allows you to connect them as either star or delta, depending on which your application requires. – Tom Carpenter Feb 12 '16 at 18:37
• Well its most likely I have not described the situation correctly, as this is definitely the data sheet which describes the motor. I am a mechanical engineering student, therefore my electronics knowledge is more limited its possible there is something simple I am missing. – James Weston Feb 12 '16 at 18:41

If you have a 3-phase $\Delta$ connected BLDC, you would expect three wires - one for each joined pair of phases (e.g. one for $U_1 V_2$, one for $V_1 W_2$ and the third for $W_1 U_2$).

If you have a 3-phase Y connected BLDC, you would expect again three - one for each phase (e.g. one for $U_1$, one for $V_1$ and the third for $W_1$, where $U_2$, $V_2$, and $W_2$ are connected internally).

In your case you have six wires. This means there are no internal connections. You are presented with all of $U_1$, $V_1$, $W_1$, $U_2$, $V_2$, and $W_2$ individually. This means you get the option of what topology you want. You make the connections to form either a Y or $\Delta$ externally.

Now, if we assume that the solid colour cables are the first side of the coil (e.g. $U_1$), and the striped cables are the second side of each coil (e.g. $U_2$), then you should be able to work out the connections based on my description above.

For Y simply connect all of the striped cables together, and each of the solid cables go to your motor driver.

For $\Delta$ connection, connect the cables in sequence so that each port of your motor driver is connected to both a striped and a solid colour cable (though not the same colour!). For example you could connect Yellow with Red Stripe, Red with Black stripe, and Black with Yellow stripe.

yes. I agree whit above answer. the motor manufacturer provide you to use the motor as stare or delta. it depend on your deriver strategy to witch one of them.