Electrical – How to test a2212/13t 1000kv


I have got a a2212/13t 1000kv brush less motor in a quadcopter which is running the propeller. I have to use that then how can I know that those motors are working?

Best Answer

There are several ways of finding out if a BLDC motor works.

  • Try to rotate the shaft of the motor. If it's stuck, then it's a good chance there's something inside the motor that shouldn't be there.
  • Measure the inductance from wire A to B, wire B to C, wire A to C. Their values should be roughly the same. The reason for why it's pointless to measure the resistance is because it's usually around 0.1 Ω which is something you can't really differentiate with a cheap multimeter.
    "Oh, all wirings are 0.1 Ω, this tells me nothing".
    "Oh, 0.1 mH there, 0.1 mH here, 1 µH here, okay there's a short here, this motor is broken".
  • Use your ESC (Electronic Speed Control) that you are going to use with the motor. If you are having problems with generating the pulses that the ESC needs. Then generate them with a MCU (Microcontroller Unit). Use no load first, so take off the propeller. Start slow and go up until you see it spin. If it never spins then there is a big chance that it's broken. Or the ESC is bad. Or that wherever you are getting your power from, is not delivering enough.

With just those three tests you will find out if it's working or not.

If you want to test it more thoroughly then you can always make a 3 phase motor driver from 6 transistors.

enter image description here

Source: http://www.irf.com/electronics/topology-fundamentals

These are IGBT's, you don't have to use them, you can also use MOSFET's. If you are going to use BJT's then you will want to add diodes in parallel with the BJT's. Efficiency wise, IGBT (If you will use large currents, say above 100 A) > MOSFET > BJT. But for a test setup then it doesn't really matter.

For a test, you will most likely just want to use a duty-cycle in the 1-10% regions, otherwise you will probably fry your transistors, because for a test-setup you won't use high end MOSFET's I assume. And yet again, the signals required to drive the MOSFET's should originate from a MCU, or a ring oscillator + buck converter.

If you want to actually build one then either ask another question regarding that (show where you're stuck, we won't help you if you haven't done any effort)), or google it.