This morning I overloaded my bench grinder and it just stopped working. It is a variable speed benchtop grinder. I took it apart and discovered a circuit board, a lage capacitor, and a motor I am unfamiliar with. The circuit board had a small fuse that looked none the worse for wear. I checked it with my ohm meter and it appeared to give a reading on the 200 scale of 0.4 ohms. I don't know what it is supposed to read if the fuse is good. I thought that if it gave me a reading in ohms that it was intact. Next, I isolated the capacitor. It is a Dianz CB660 300V 18uF capacitor. I do not have a device that allows me to check capacitors so I went on to the motor. The motor has an unusual rotor. It is just a closed cylinder. I have no idea what is inside. The stator, on the other hand, looks like something I am familiar with. It has an iron core with copper coils. There are 4 wires that are part of the stator. There are 2 black wires that go to the circuit board and 2 white wires that form a closed loop with the capacitor. I checked the resistance between the two black wires and the resistance between the 2 white wires. I got a reading of 4.5 ohms and 11.5 ohms, respectively. I also checked the resistance between the black and white wires and got 4 different values for the 4 possible combinations. The first black wire and white wire A produced 4.5 ohms. The first black wire and white wire B produced 7.5 ohms. The second black wire and white wire A produced 0.4 ohms. And, the second black wire and white wire B produced 4.5 ohms. I dont really know what is going on here, so any help would be greatly appreciated.
thanks,
sean
thanks,
sean