Ac Fan Motor Speed Control

If we just lower the voltage the power goes down but the line frequency stays the same and thus we start to see slip where the motor can no longer follow the frequency.

Ac fan motor speed control.

The common method of ac fan speed control. Control resources is a leading manufacturer of ac motor speed control products that control motors fans or pumps for a variety of industry applications with current rating up to 18 amps. Ac fan motor speed controls. On the flip side this is basically how ceiling fan speed controllers work however their motors are usually only rated to 150va making a 400va device perfect.

Ac induction motor speed control. Reducing the voltage is a common practice used to control the speed of induction motors that drive fans. Our ac motor speed controls regulate motor speed based on inputs that include temperature analog 0 20ma 0 10vdc signal or. If your speed selector for your ac or heat only works on high or low or if its missing any particular speed this video will show you how to fix it once an.

For this we must need to detect the zero point from which the signal is to be controlled chopped. So what can we do to control the speed of an ac induction motor. Kb electronics variable speed ac motor control 10 0 max amp k177 2010 this is a brand new original equipment manufacturer oem kb electronics wall mount solid state variable speed ac motor control 230 volt 10 0 max amps part k177 1015. Hi motors used for ac fans are set up to follow the frequency of the line voltage and they need a certain amount of power to do that and they get this power from the 120vac or whatever line voltage.

Change the number of poles in discrete increments inefficient rarely done change the frequency of the ac signal change the slip. 3 triacs to chop up the wave form to reduce the on time the motor receives. It doesn t work well for ordinary mechanical losds but because fan torque is proportional to speed squared or some higher power reducing voltage to allow the motor to slip more doesn t cause an overheat because current also decreases. If the load is a motor the dimmer will only be good for between 80 to maybe 90 of that meaning it could be as low as 1 33amps effect called power factor.

For controlling the speed of ac fan the peak voltage of both the half cycles needs to be chopped or controlled. For example if you are using 230vac fan you can supply 110v to the fan for low speed or supply 160v for medium speed. 1 ac fan speed control by using toroidal transformer.