Search This Supplers Products:Single Phase Electric MotorReduce Gear MotorWorm Reducer MotorDC GearThree Phase Electric MotorChain Hoist
Single phase electric motor works briefly
time2012/01/05
Single phase electric motor is only one winding, the rotor is the squirrel-cage type. When the single-phase sinusoidal current through the stator windings, the motor will produce an alternating magnetic field, the magnetic field strength and direction of change at any time intercropping sine law, but in spatial orientation is fixed, so called the alternating magnetic field is pulsating magnetic field. The alternating magnetic field pulse can be decomposed into two with the same speed, direction of rotation of the rotating magnetic field opposite each other, when the rotor is stationary, the two rotating magnetic field in the rotor produce two equal and opposite torque, making the synthesis torque is zero, so the motor can not rotate. When we use force to make the motor to rotate in one direction (eg clockwise rotation), then a clockwise rotation of the rotor and the rotating magnetic field, magnetic field lines between the cutting movement is small; counterclockwise rotation of the rotor and the rotating magnetic field between the larger magnetic field lines cutting exercise. This would break the balance, the total generated by the rotor of the electromagnetic torque will no longer be zero, the rotor will spin up along the drive direction.
For single phase electric motor can automatically rotate up, we can start with a stator winding, starting winding and main winding 90 degrees difference in space, starting winding connected in series to a suitable capacitor, with the main winding current on the approximation of the phase difference of 90 degrees, the so-called split-phase theory. This difference in time, two 90-degree power flow into the two 90-degree difference in the space of winding will produce in space (two phase) rotating magnetic field, in the rotating magnetic field, the rotor will automatically start, start and after the rise to a certain worm reducer motor speed when installed on the rotor by means of a centrifugal switch or other automatic control device to disconnect the start winding during normal operation only the primary winding work. Therefore, the starting winding can be made short work. However, many times, starting winding does not disconnect, we call this motor is a single-phase motor, to change the direction of rotation, can change the location of the capacitor in series to achieve.
In the single phase electric motor, the rotating magnetic field produced another method known as shaded pole method, also known as single-phase shaded pole motor. Salient-pole motor stator made of this type, there are two poles and four poles two. Each pole in the all-pole surface of the open 1/3--1/4 a small groove, the pole is divided into two parts, in a small part of the package on a short-circuit copper ring, as if this part of the pole cover up the same, chain hoist so called shaded pole motor. Single-phase winding sets in the entire pole, each pole of the coil is in series connection to produce the polarity must be followed by N, S, N, S arrangement. When the stator windings are energized, the main magnetic flux generated in the magnetic poles, according to Lenz's law, which the main magnetic flux through the short circuit copper ring in the copper ring to generate a phase lag of 90 degrees on the induced current, the current generated by the magnetic through the phase lag is also the main flux, its role and the motor start winding capacitance equivalent to the motor rotating the rotating magnetic field generated up.
For single phase electric motor can automatically rotate up, we can start with a stator winding, starting winding and main winding 90 degrees difference in space, starting winding connected in series to a suitable capacitor, with the main winding current on the approximation of the phase difference of 90 degrees, the so-called split-phase theory. This difference in time, two 90-degree power flow into the two 90-degree difference in the space of winding will produce in space (two phase) rotating magnetic field, in the rotating magnetic field, the rotor will automatically start, start and after the rise to a certain worm reducer motor speed when installed on the rotor by means of a centrifugal switch or other automatic control device to disconnect the start winding during normal operation only the primary winding work. Therefore, the starting winding can be made short work. However, many times, starting winding does not disconnect, we call this motor is a single-phase motor, to change the direction of rotation, can change the location of the capacitor in series to achieve.
In the single phase electric motor, the rotating magnetic field produced another method known as shaded pole method, also known as single-phase shaded pole motor. Salient-pole motor stator made of this type, there are two poles and four poles two. Each pole in the all-pole surface of the open 1/3--1/4 a small groove, the pole is divided into two parts, in a small part of the package on a short-circuit copper ring, as if this part of the pole cover up the same, chain hoist so called shaded pole motor. Single-phase winding sets in the entire pole, each pole of the coil is in series connection to produce the polarity must be followed by N, S, N, S arrangement. When the stator windings are energized, the main magnetic flux generated in the magnetic poles, according to Lenz's law, which the main magnetic flux through the short circuit copper ring in the copper ring to generate a phase lag of 90 degrees on the induced current, the current generated by the magnetic through the phase lag is also the main flux, its role and the motor start winding capacitance equivalent to the motor rotating the rotating magnetic field generated up.