A shaded pole motor is a simple self-starting AC single-phase induction motor. It is a small squirrel-cage motor, one of which is surrounded by a copper ring. The copper ring is also called a shaded pole ring or a shaded pole ring. This The copper ring serves as the secondary winding of the motor. The salient feature of the shaded pole motor is that the structure is very simple, there is no centrifugal switch, the power loss of the shaded pole motor is large, the power factor of the motor is low, and the starting torque is also very low. They are designed to remain small and have low power ratings. The speed of the motor is as precise as the frequency of the power applied to the motors, which are often used to drive timepieces. The shaded pole motor only rotates in one specific direction, the motor cannot rotate in reverse, the loss caused by the shaded pole coil, the efficiency of the motor is low, and its structure is simple. These motors are widely used in household fans and other small-capacity electrical appliances.
Working principle of shaded pole motor
A shaded pole motor is an AC single-phase induction motor. The auxiliary winding is composed of a copper ring, called a shaded pole coil. The current in the coil delays the phase of the magnetic flux at the pole to provide a rotating magnetic field. The direction of rotation is from the non-shaded pole to the shade pole ring.
The shaded pole coil (ring) is designed so that the axis of the magnetic pole deviates from the axis of the main pole magnetic pole, and the field coil and the additional shaded pole coil generate a weak rotating magnetic field. When the stator is energized, the magnetic flux of the pole body generates a voltage in the shaded pole coil. The shaded pole coil acts as the secondary winding of the transformer. The current in the secondary winding of the transformer is not synchronized with the current in the primary winding, and the magnetic flux of the shaded pole is not synchronized with the magnetic flux of the main pole. See the coil winding wire that used in the motor.
In a shaded pole motor, the rotor is placed in a simple C-shaped core, and half of each pole is covered by a shaded pole coil, which produces pulsating magnetic flux when AC current is passed through the supply coils. When the magnetic flux passing through the shading coil changes, voltage and current are induced in the shaded pole coil, corresponding to the change in magnetic flux from the power supply coil. Therefore, the magnetic flux under the shaded pole coil lags behind the magnetic flux in the rest of the coil. The rotor is rotated by creating a small rotation in the magnetic flux through the rotor.
Shaded pole motor structure
The rotor and its associated reduction gear train are encased in an aluminum, copper or plastic housing through which the enclosed rotor is magnetically driven. Such geared motors typically have a final output shaft or gear that rotates from 600 rpm to 1 per hour. /168 revolutions (1 revolution per week). Since there is usually no clear starting mechanism, the rotor of a motor powered by a constant frequency power supply must be very light in order to be able to reach operating speed within one cycle of the power frequency, the rotor can be equipped with a squirrel cage so that the motor starts like an induction motor, once the rotor is Pulled in sync with its magnet, there is no induced current in the squirrel cage, so it no longer plays a role in operation, and the use of variable frequency control enables the shaded pole motor to start slowly and deliver more torque.
Working principle of shaded pole motor
A shaded pole motor is an AC single-phase induction motor. The auxiliary winding is composed of a copper ring, called a shaded pole coil. The current in the coil delays the phase of the magnetic flux at the pole to provide a rotating magnetic field. The direction of rotation is from the non-shaded pole to the shade pole ring.
The shaded pole coil (ring) is designed so that the axis of the magnetic pole deviates from the axis of the main pole magnetic pole, and the field coil and the additional shaded pole coil generate a weak rotating magnetic field. When the stator is energized, the magnetic flux of the pole body generates a voltage in the shaded pole coil. The shaded pole coil acts as the secondary winding of the transformer. The current in the secondary winding of the transformer is not synchronized with the current in the primary winding, and the magnetic flux of the shaded pole is not synchronized with the magnetic flux of the main pole. See the coil winding wire that used in the motor.
In a shaded pole motor, the rotor is placed in a simple C-shaped core, and half of each pole is covered by a shaded pole coil, which produces pulsating magnetic flux when AC current is passed through the supply coils. When the magnetic flux passing through the shading coil changes, voltage and current are induced in the shaded pole coil, corresponding to the change in magnetic flux from the power supply coil. Therefore, the magnetic flux under the shaded pole coil lags behind the magnetic flux in the rest of the coil. The rotor is rotated by creating a small rotation in the magnetic flux through the rotor.
Shaded pole motor structure
The rotor and its associated reduction gear train are encased in an aluminum, copper or plastic housing through which the enclosed rotor is magnetically driven. Such geared motors typically have a final output shaft or gear that rotates from 600 rpm to 1 per hour. /168 revolutions (1 revolution per week). Since there is usually no clear starting mechanism, the rotor of a motor powered by a constant frequency power supply must be very light in order to be able to reach operating speed within one cycle of the power frequency, the rotor can be equipped with a squirrel cage so that the motor starts like an induction motor, once the rotor is Pulled in sync with its magnet, there is no induced current in the squirrel cage, so it no longer plays a role in operation, and the use of variable frequency control enables the shaded pole motor to start slowly and deliver more torque.
