I have a AC motor of 230V/50HzI have a circuit that senses a light signal.I want to operate the motor (say, for closing a door) whenever the circuit senses the light on, and reopen the door whenever the light goes off, what motor controller or other circuit can be used?
Your question poses several other questions. Does the AC motor operate on 1 phase or 3 phase supply? How do you envisage the motor mechanically connecting to the door? The reason for the questions is that 1 phase AC motors are difficult to reverse (opening and closing the door) The single phase AC motor runs at a fixed speed (typically 1500 or 3000 rpm in UK). Starting the simple AC motor and stoping it in a precise position is not possible.. There are available, in the market place, door opener mechanisms that come complete with motor,gearbox and actuator that can operate on a contact closure. Your light sensor can provide that contact closure so I would suggest that you investigate the automatic door opener closure market
photoelectric cell, and a latch circuit
the cost of the AC motor is set basically via the frequency of the AC grant and the form of poles interior the stator winding, in accordance to the relation: Ns = 120F / p the place Ns = Synchronous speed, in revolutions in line with minute F = AC power frequency p = form of poles in line with section winding quite RPM for an induction motor would be decrease than this calculated synchronous speed via an volume properly-referred to as slip, that will develop with the torque produced. with out load, the cost would be very close to to synchronous. whilst loaded, prevalent autos have between 2-3% slip, particular autos could have as much as 7% slip, and a class of autos properly-referred to as torque autos are rated to function at a hundred% slip (0 RPM/finished stall). The slip of the AC motor is calculated via: S = (Ns ? Nr) / Ns percentageslip = (Ns ? Nr) / Ns * a hundred the place Nr = Rotational speed, in revolutions in line with minute. S = Normalised Slip, 0 to a million. as an occasion, a common 4-pole motor working on 60 Hz ought to have a nameplate score of 1725 RPM at finished load, mutually as its calculated speed is 1800 RPM. the cost in this form of motor has traditionally been altered via having extra instruments of coils or poles interior the motor which may be switched on and rancid to alter the cost of magnetic container rotation. in spite of the undeniable fact that, advancements in power electronics recommend that the frequency of the ability grant could additionally now be numerous to offer a smoother administration of the motor speed.
