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controlling an HVAC motor with mains pulses ?

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kripton2035:
Hi folks,


I made some module to control the speed of an HVAC motor (which must be an induction asynchronous one ?)
I tried to speed control it using a variable phase triac method and this doesn't work (very little 10° where you can change speed from zero to max)


so I tried to control it's speed using a pulse train of 50Hz 230V.
I detect the zero cross of the mains, then send 1 to 10 pulses of 230v 50hz with a triac
it's been made with an esp8266 using arduino IDE.
it's working as the speed of the motor can be controlled from 0 to 100% in a 10% increment.
but I have some concerns.
1/ the motor is making some inhabitual noises, is there a way to reduce them ?
2/ isn't it dangerous for the motor life span ?


thanks for any hint(s) on the subject.

kripton2035:
this kind oh hvac motor


kripton2035:
nobody ? :(

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