how to reduce single phase AC motor speed?
The only way is reducing the supply frequency .....disregard all the rest !!!!! or u'll burn r motor out !!!
Note that this kind of speed control is relative regulated. If it is a small fan etc, put a AC capacitor in series. ~motor running capacitor.
One way is that copping a reducer gear box with ratio 1:2 or 1:4 and up . one way is to use dimmer speed control ,but will make change to power of the motor.
There is no method to do this. This is an induction motor. A VFD (Variable Frequency stress) is not going to work as introduced up by way of lunchtime_browser. You're going to have received to use a gearbox with nearly any motor to do that. When you use an induction motor (squirrel cage or AC motor), it's feasible to control a 3 part motor to reduce speeds with the help of utilising a VFD, that reduces the voltage and modifications the frequency, however most effective inside limits. These can also be programmed to a constant velocity, nevertheless no longer so gradual as 100 and twenty RPM. The cooling could additionally have received to be addressed (fan too sluggish). Single phase (reduce up phase) motors are further restricted, whether or not or no longer making use of a centrifugal switch or no longer. You most often desire a DC motor in case you occur to insist on no gearbox. The variable percent controller to swimsuit this motor is just set to the speed you wish to have. If you want a designated speed it desires a velocity controller with p.C. Sensor and feedback. Be aware that the mechanical energy is the constructed from RPM and torque. The torque is variety of the equal, as it's decided through the present ranking. Nonetheless with a hundred and twenty RPM from a 1440 RPM motor the pace is just one/12 so the power is only 1/12. Utilizing a gearbox increases the torque and reduces the percent so the energy is more or less the identical. There are gearmotors for a large variety of output RPM. A bicycle hub motor could suit if the power is to your form. One more proposal is a stepper motor, which can run at these low speeds, however it does want a controller (driver) and vigor provide..
One way - the crudest - is to install a Resistance in between the origin and the end (series). Other more intelligent ways include transforming the cycle of the AC (120 Volts, 60 cycles) via Capacitors (this will chage the relationship between the Current (I in Amperes) and E (Voltage, in volts). For instance: if they use a big Capacitor in series with the feed of the motor, the Current will increment instantaneously, making the E (voltage to drop considerable). This will change the relationship (the more Amperes) the Less voltage. This will be fed to a circuit that will trigger (let go the charge of the Capacitor, discharging it rapidly and stopping the process in the way), generating a blow, a hit to the motor, that will last a mere fraction of the time interval, but creating enough torque for the motor to continue strong. Then the next pulse, and so forth, hundreds of times a minute. second or whatever. They were originally (they modified them again and again, many times, creating new things all the time!) called pulse motors, then, micro motors, etc Some may suggest to add more poles, but that would debilitate the motor output: more poles, less torque. You need more current, less voltage. This is called the Cosine Phi in this relation. When you change it, you generate torque (strength). All IS a relationship. The latest is brushless AC motors used in the industry to move heavy elements very rapidly and accurately.
