Although this is not strictly an engineering problem, I hope there i
someone who can point me in the right direction to solve a strang problem I have with an electric motor.
For about 25 years I have had an Elektra Beckum table mounted 12 inc circular saw which for several years has been used rarely, maybe onl one job in a year. The motor is a 2.2 kw, 2,800 rpm capacitor star single phase induction motor, which is rated at 11.5A.
Recently I needed to use the saw, but when I pressed the start butto the motor started in reverse ? not what you want with a circular saw!
It has never done this before and there is no reverse option on th no-volt switch.
The next time I attempted to start the saw it was obvious that i didn?t ?know? which way to rotate and blew the 13amp fuse ? it ha blown fuses ever since I?ve had the saw but not often enough to warran any serious investigation.
At the next start up I spun the saw blade in right direction and the pressed the start button, whereupon the saw ran perfectly.
I have used the saw frequently over the last ten days and have foun that I have to spin the blade to ensure the motor starts in the righ direction. It has been cutting long lengths of timber with no signs o distress. If I don?t spin the blade the motor will mostly start in th wrong direction, very occasionally in the right direction, and has als blown another fuse.
Before I pull the motor to pieces does anyone have any ideas why thi is happening and what to look for when I get inside the motor?
Thanks.
Joh
-- jlh4
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