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Electric Motors/Variable speed switch and motor

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Question
I have an electric saw with a motor that is 230v, 50Hz and 1Ph. The variable speed switch has an intermittent fault in that the motor speeds up without control from the switch. The saw is old and the manufactures switch is unavailable. What type / rating switch would you recommend?

Answer
I am not familiar with the type of motor you have, but I assume its a capacitor run single motor i.e. it does not have have an internal centrifugal switch to cut off the start winding.

A speed switch such as one designed for a fan application could work so long as the ampere rating is within the motor full load amps.
This would be similar to a light dimmer switch.

Electric Motors

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Harcharan Singh Diocee

Expertise

Electric motor winding redesign, AC and DC. Troubleshooting, motors controls generators. Vibration analysis, dynamic balancing, root cause analysis: electrical and mechanical.

Experience

thirty five years electro-mechanical and Senior Management

Organizations
EASA, CSA, ASTTBC, FSR

Education/Credentials
Journeyman Motor Rewinder, Millwright, Industrial Electrician, Vibration Analyst level II. Certified Electrical Technician ASTTBC, FSR Class B, in BC. Laser alignment specialist. Marine machinery repairs. Business Management Certificate. Last 19 yrs as Plant Manager

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