Capacitors on induction motor tools
I've had two tools die on me in the last fortnight. The first was a
cement mixer and the second a table saw. Both had induction motors and in both cases it was the capacitor that supplies the starting torque that failed... an acrid smell followed by a humming and a failure to rotate, cured by a shove to the blade or barrel. Both tools were under guarantee and the manufacturers were happy to put spare capacitors in the post but since I generally take care of tools and don't recall overloading either of them, I was wondering what put the kibosh on the capacitors in the first place? The mixer manufacturer said that the capacitor should cope with a full load from a standing start even though they recommend starting the drum empty. Is capacitor failure a general problem with induction motors? Mike |
Capacitors on induction motor tools
mike wrote:
I've had two tools die on me in the last fortnight. The first was a cement mixer and the second a table saw. Both had induction motors and in both cases it was the capacitor that supplies the starting torque that failed... an acrid smell followed by a humming and a failure to rotate, cured by a shove to the blade or barrel. Were you at the time starting them frequently? The capacitor is not rated for the continuous starting current, just intermittent. They can also dry out over time. |
Capacitors on induction motor tools
"mike" wrote in message om... I've had two tools die on me in the last fortnight. The first was a cement mixer and the second a table saw. Both had induction motors and in both cases it was the capacitor that supplies the starting torque that failed... an acrid smell followed by a humming and a failure to rotate, cured by a shove to the blade or barrel. Both tools were under guarantee and the manufacturers were happy to put spare capacitors in the post but since I generally take care of tools and don't recall overloading either of them, I was wondering what put the kibosh on the capacitors in the first place? The mixer manufacturer said that the capacitor should cope with a full load from a standing start even though they recommend starting the drum empty. Is capacitor failure a general problem with induction motors? No. Are you running them from mains or a generator. If the latter suspect this isn't performing to spec. |
Capacitors on induction motor tools
In message , mike
writes I've had two tools die on me in the last fortnight. The first was a cement mixer and the second a table saw. Both had induction motors and in both cases it was the capacitor that supplies the starting torque that failed... an acrid smell followed by a humming and a failure to rotate, cured by a shove to the blade or barrel. Both tools were under guarantee and the manufacturers were happy to put spare capacitors in the post but since I generally take care of tools and don't recall overloading either of them, I was wondering what put the kibosh on the capacitors in the first place? The mixer manufacturer said that the capacitor should cope with a full load from a standing start even though they recommend starting the drum empty. Is capacitor failure a general problem with induction motors? Yes -- geoff |
Capacitors on induction motor tools
Ian Stirling wrote in message ...
mike wrote: I've had two tools die on me in the last fortnight. The first was a cement mixer and the second a table saw. Both had induction motors and in both cases it was the capacitor that supplies the starting torque that failed... an acrid smell followed by a humming and a failure to rotate, cured by a shove to the blade or barrel. Were you at the time starting them frequently? The capacitor is not rated for the continuous starting current, just intermittent. They can also dry out over time. Thanks for the reply. Yes, they'd been started fairly frequently at the time. The table saw is a cheapie but I'd have expected the mixer to be made of sterner stuff. |
Capacitors on induction motor tools
"G&M" wrote in message ...
Is capacitor failure a general problem with induction motors? No. Are you running them from mains or a generator. If the latter suspect this isn't performing to spec. Thanks for the reply. They're both being run from the mains. |
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