There are synchronous and asynchronous motors. A synchronous motor's speed will be affected by the frequency. An asynchrous one won't care too much. And most tools have asynchronous motors. The 10V difference won't do much harm I think. After all some stuff works on a low 220V system as well as on a British 240V...
Re: 110 volt supply, U.S. Power tools#141939 11/14/0409:27 AM11/14/0409:27 AM
It shouldn't be a huge problem 110V 60Hz is well within the tollerance of any US product. The old official rating was 110V and I'm sure that there are plenty of outlets in the US and Canada that supply closer to 110V than 120V.
If the frequency isn't an issue it work just fine.
The only thing to note is that the transformers used in the UK and Ireland provide 2 X 55V lives out of phase. So, you've 110V between the two lives and 55V between either terminal and ground. This reduces the potential for electric shock.
It's really not a problem, however just be aware that your powertool could be live with 55V even when the switch is in the off position.
Re: 110 volt supply, U.S. Power tools#141941 11/14/0401:15 PM11/14/0401:15 PM
I've also run U.S. power tools from the 110V site transformers as well, and never experienced any problems.
The "universal" motor is the one you will find in just about all hand-held power tools, and the frequency difference on these is of no great significance. In fact some universal motors are designed to be run on DC as well as AC (many older domestic vacuum cleaners had such a motor, for example).
These universal motors are all of the asynchronous type, meaning that the rotor speed is not locked to the supply frequency. Synchronous motors are found in such items as electric clocks (mechanical type), small fans, and older style record players and tape recorders.
I'm confused about the tool being live with 55 volts with the switch even in the off position. I didn't get a shock, burn, or tingling sensation yet
Don't worry, you won't be zapped!
The 120V you get from a wall outlet in the United States has a "hot" line and a neutral, just as a 240V British socket provides a live and a neutral. In both cases, the neutral is grounded (earthed) at source, so there is no voltage between it and the earth. The live/hot line is then at 120 or 240V with respect to earth.
The British 110V site transformer has a transformer winding with the center-tap earthed. That means that the two supply lines are both "hot" -- There is 110V between the two wires, but only 55V between either wire and earth. The idea is that the reduced voltage to earth improves safety (and we've had debates about that in the past!).
In practice, as far as your portable power tools are concerned, that's of no consequence so long as you don't go poking around inside them with the power connected.
Re: 110 volt supply, U.S. Power tools#141944 11/16/0404:13 PM11/16/0404:13 PM
Thank you for writing. The motor we use is neither synchronous nor asynchronous. It is a Universal Series motor. Since you have actually reached Skil USA customer service, if you have additional questions, please contact Skil UK through the following link"
I'm still a little confused though as there seems to be three types of motor - synchronous, asynchronous and universal.
[This message has been edited by davelloyd (edited 11-19-2004).]
Re: 110 volt supply, U.S. Power tools#141946 11/20/0404:39 PM11/20/0404:39 PM
It sounds as though Skil customer service is confused, for the universal series motor is a type of asynchronous motors.
All motors must fall into the overall synchronous or asynchronous categories. Either the design of the motor synchronizes its speed to the supply frequency or it doesn't. The universal series type doesn't, therefore it is, by definition, an asynchronous motor.