The distribution of two-phase windings on the stator of small power single-phase asynchronous motors and the difference in power supply can produce different starting characteristics and operating characteristics. The following is the content of the working principle of single-phase asynchronous motors organized by Senli Motor. Let's understand it together!

       When the single-phase sinusoidal current passes through the stator winding, the single-phase generator generates an alternating magnetic field, the direction of which changes sinusoidal at any time, also known as alternating pulsating magnetic field.

When there are two rotating magnetic fields with the same speed and opposite rotation directions, when the rotor of the single-phase motor is stationary, the two rotating magnetic fields produce two equal and opposite torques in the rotor, so that the resultant torque is zero, and the motor cannot rotate;

       However, if we rotate the motor in a certain direction by external force (such as clockwise rotation), then the motion of the cutting magnetic field line between the rotor and the rotating magnetic field in the clockwise rotation direction becomes smaller; The motion of the cutting magnetic field line between the rotor and the rotating magnetic field in the counterclockwise rotation direction becomes larger.

       This balance is broken, the total electromagnetic torque generated by the rotor will no longer be zero, and the rotor will rotate in the direction of the push.

       In a single-phase motor, another method of generating a rotating magnetic field is called the shield pole method, also known as the single-phase shield pole motor.

       This approach is going toSingle-phase machineThe stator is made of convex pole type, with two poles and four poles. Each magnetic pole is1/3～1/4There is a small slot at the full pole surface, the magnetic pole is divided into two parts, and a short circuit copper ring is set on the small part, as if this part of the magnetic pole is covered, so it is called a covered pole motor.

       The single-phase winding is set on the entire magnetic pole, and the coils of each pole are in series, and the polarity generated by them must be sequentially pressed when connectedN,S,N,SLine up. When the stator winding is energized, the main magnetic flux is generated in the magnetic pole, and according to Lenz's law, the main magnetic flux passing through the short-circuited copper ring produces a phase lag in the copper ring90The magnetic flux generated by this current also lags behind the main magnetic flux in phase, and its role is comparable to that of the starting winding of a capacitive motor, thus generating a rotating magnetic field to make the motor rotate.

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