Hi All,

Please pretend for now that I know nothing about brushless motors, except that they do not have any brushes.

If I had a 24VDC version exactly the same as the diagram attached .... how would I bench test it?
On a budget of less than £500 would there be a benchtop unit that would monitor the sensors and make it run?

I would not be trying to stress the motor or testing its torque, just rotating in both directions would do it.

 

Welcome to AAC!
A bit of googling for "BLDC motor driver module" should find you something at a modest price. You would need to check that current and voltage ratings meet your needs; also source a suitable power supply.

 

Welcome to AAC!
A bit of googling for "BLDC motor driver module" should find you something

I did see a lot of modules that are going to need external components to make them work. I had my fingers crossed that some company was building an all in one solution.
Maybe not (maybe not an all in one solution is available), but cheers for getting back to me.

 

Maybe investigate one version of a cycle motor!

 

If I had a 24VDC version exactly the same as the diagram attached .... how would I bench test it?

To bench test this sort of motor measure the resistance between A & B. Between B & C. Between C & A. The resistance between each should be basically the same.

 

You also would need a drive that can use the phase sensors for correct commutation in order to run.,

 

You also would need a drive that can use the phase sensors for correct commutation in order to run.,

Or use a sensorless controller that relies on back EMF or uses HFI (High Frequency Injection). The former is fairly common while the latter is somewhat exotic.

 

Sorry, thought I was posting to a different thread. If you've looked at this comment and am now wondering where it went - it went to a different thread.
https://forum.allaboutcircuits.com/threads/3-phase-brushless-motor-back-emf.205506/

 

I find it is strange that the motor appears to only have 2 power conductors/windings?
The 3 light grey conductors I assume are the sensors?

 

I find it is strange that the motor appears to only have 2 power conductors/windings?
The 3 light grey conductors I assume are the sensors?

My comment has been deleted from this thread and moved to the thread I started. I don't want to hijack this thread.

 

The other SIMPLE bench test, or "field test" for an AC motor is a resistance check between the motor terminals and the motor frame. Very often a burned out motor will show some level of continuity between the windings and the frame. Lightning strikes will also lead to this condition.

 

To bench test this sort of motor measure the resistance between A & B. Between B & C. Between C & A. The resistance between each should be basically the same.

Very often a burned out motor will show some level of continuity between the windings and the frame.

Very true.