shaded-pole motor (Ac single phase) speed reduction

[fences]

Hello,
I use a diode to reduce the speed of the AC "shaded-pole motor". but there are some issues:
"noise" and "vibration" of the motor has been increased. ( there is hum voice )
is this vibration and noise damage the motor?
thanks.

 

[KlausST]

Hi

We don't know how you used the diode. Nor do we know the type of motor or voltages or currents.

A simple hand drawn schematic should show all this.

Klaus

 

[fences]

Hi

We don't know how you used the diode. Nor do we know the type of motor or voltages or currents.

A simple hand drawn schematic should show all this.

Klaus

Thanks. this is my schematic:

 

[KlausST]

Hi,

Please give a link to the datasheet of "Universal diode". ;-)

Generally it is no good idea to run an inductive device (motor, valve, transformer...) that is designed for pure AC on DC (or AC + DC). Otherwise the magnets (inductor core) gets saturated and causes high current, and high dissipated power (heat).

A better solution could be to use two anti series connected Zeners to reduce both half waves symmetrically. Mind the dissipated heat. For sure a resistor in series could work, too, but with less motor torque...

Often used: Triac phase control. (Dimmer).

Klaus

 

[fences]

Hi,

Please give a link to the datasheet of "Universal diode". ;-)

Generally it is no good idea to run an inductive device (motor, valve, transformer...) that is designed for pure AC on DC (or AC + DC). Otherwise the magnets (inductor core) gets saturated and causes high current, and high dissipated power (heat).

A better solution could be to use two anti series connected Zeners to reduce both half waves symmetrically. Mind the dissipated heat. For sure a resistor in series could work, too, but with less motor torque...

Often used: Triac phase control. (Dimmer).

Klaus

I meant that any type of 4000 series like 1n40002
thanks a lot for the reply.

 

[ZASto]

Your image shows universal motor, not shaded pole motor.
Shaded pole motors do not have brushes

 

[FvM]

Your image shows universal motor, not shaded pole motor.
Shaded pole motors do not have brushes

No brushes in the photo! It looks very much like a standard shaded pole induction motor.