We have an automated saw system that uses an OMGA single phase 230 volt motor. It ran for 2 years without any problems. A few months back it burned up. I took the motor off and took it to a local company to get rewound. We ended up buying a new motor direct from OMGA as the lead time to get it was 6 weeks. Within a day the new motor burned up. I hired the motor repair company to come out and put the rewound motor on to make sure everything was alright. A few hours after they left this motor burned up as well. To make a long story short, we got a hold of OMGA and they had us ship the saw and all the motors back to the factory. They rebuilt the saw and the motors. My son was getting ready to install everything and decided to check the voltage output at the plug. He measured 246 volts. The specs for the OMGA saw say it draws 9.4 amps at 230 VAC, tolerance is +/- 5%. with this variance the voltage needs to be 218 - 241 VAC. Could this slight overage be the cause of the motors burning up? If so, how did the original saw run for 2 years. Any help/advice would be greatly appreciated

 

Welcome to AAC!

I am going to hazard a guess that it is not the high voltage that is burning out your saw, it is the over-spec current.
When a motor is loaded beyond specifications the current drawn will increase. The worst case scenario is a stalled motor. That will burn the motor in no time.

Over the years the friction on the motor may have increased and hence the base current drawn has also increased. Add the load on top of that, the overall current has increased. The temperature rises. Pushed over the top and the motor burns out.

My radial arm saw and table saw are plugged into circuit breakers with current limiting. When the saw is overloaded the breaker trips and the power to the motor is interrupted instead of ended up with a burnt motor.

 

Is this a 1ph AC induction motor?
If/when installing a new motor I would obtain a clamp on ammeter and monitor the current & motor frame temperature regularly and see where the over loading occurs.

 

We have an automated saw system that uses an OMGA single phase 230 volt motor. It ran for 2 years without any problems. A few months back it burned up. I took the motor off and took it to a local company to get rewound. We ended up buying a new motor direct from OMGA as the lead time to get it was 6 weeks. Within a day the new motor burned up. I hired the motor repair company to come out and put the rewound motor on to make sure everything was alright. A few hours after they left this motor burned up as well. To make a long story short, we got a hold of OMGA and they had us ship the saw and all the motors back to the factory. They rebuilt the saw and the motors. My son was getting ready to install everything and decided to check the voltage output at the plug. He measured 246 volts. The specs for the OMGA saw say it draws 9.4 amps at 230 VAC, tolerance is +/- 5%. with this variance the voltage needs to be 218 - 241 VAC. Could this slight overage be the cause of the motors burning up? If so, how did the original saw run for 2 years. Any help/advice would be greatly appreciated

The voltage is not responsible. You likely had an arbor bearing failure, along with no, or malfunctioning overload protection. Were you resetting and restarting this motor before it went up in smoke? I can’t count the times I’ve addressed similar circumstances.

 

A dull Blade, or wet/sappy wood, or unusually thick cuts,
no cool-off time between repeated cuts,
lack of Motor-Cooling-Air from dust, or a missing Fan or Fan-Shroud,
any or all of these can push the Current / Temperature up really fast.
.
.
.