0
\$\begingroup\$

For a project I'm using 4 12V, 35AH lead acid batteries in series which powers a 400W, 48V bldc motor. The maximum current the motor would draw from the battery set is 12A. enter image description here

enter image description here

How should I choose the type and rating of wires that connects the 4 batteries in series?

How should I choose the type and rating of wires that connect the battery to the motor unit?( I haven't arrived at the length of these wires yet)

I also have to provide a kill switch for the circuit. How do I choose that?

This is how the motor control unit is : enter image description here

\$\endgroup\$

1 Answer 1

Reset to default
0
\$\begingroup\$

1st find out the DCR of the motor coil and plan on support these currents at max voltage. Then choose switches with much lower resistance than this for low heat loss. Normally starting current max is 8x rated max current! +/- 25% depending on motor and controller design.

Brushless DC motor problems at high velocities

\$\endgroup\$
3
  • \$\begingroup\$ Thanks. Any idea on the connecting wires? \$\endgroup\$
    – asr
    Commented Sep 19, 2017 at 4:56
  • \$\begingroup\$ yes of course , use Ohm's Law for voltage drop and wire heating based on 100A surges during acceleration from start and consider welding cables.. Look at golf cart design. \$\endgroup\$
    – D.A.S.
    Commented Sep 19, 2017 at 14:16
  • \$\begingroup\$ for short distances smaller AWG is ok, like here ebay.ca/itm/… \$\endgroup\$
    – D.A.S.
    Commented Sep 19, 2017 at 14:26

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.