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How does my washing machine detect out of balance loads? I would assume there is some sort of detector attached to the outer drum, but I can’t see anything. (it is working fine; I am just curious)
(it is a Blomberg 1501)
Most systems constantly monitor the speed of the drive motor and see OOB as a cyclic change in it’s speed…
Re: Out of Balance load detection
There is usually a tacho coil, and a magnet which is attached to the motor shaft. The electronics monitor the number of pulses per second, according to speed, and compare it to pre-programmed sets of values. Any deviation will cause the spin profile to be reduced, or aborted altogether.
Some older machines also had a weighted microswitch attached to the tub itself. Strong vibrations would cause the microswitch to open and close, thus keeping the machine at a safe, but still efficient speed. Computer machines could slightly increase the speed until the vibrations became excessive, then reduce the speed again. Hoover tended to use such systems.
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