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1. What is a shaded pole motor?
Shaded Pole Motors, also known as Shaded Pole Motors, are one of the single-phase AC motors that typically use cage-chutes cast aluminum rotors.
Second, the structure of the shaded pole motor
1. Between the rotor groups: It is mainly composed of thrust washers to prevent the main aluminum rotor, shaft and rotor from moving back and forth and gaskets to adjust the amount of movement.
2. Between stator groups: mainly composed of short circuit and main stator core.
3. Wire packaging components: mainly composed of coils, skeletons, leads or thermal protectors and related insulating bandage materials.
4. Bracket components: separate the front and rear bracket components according to the axial tension end and the non-axial tension installation position.
3. The working principle of the shaded pole motor
Basic Principle of Shaded Pole Motor The stator coil generates magnetic force after the main winding is energized. The magnetic force enters the air gap through the stator core. Most of the magnetic force enters the air gap through the unblocked portion of the pole. The small magnetic force enters the air gap through the short-circuit ring, the pair of windings, through reactance (or the principle of Faraday's electromagnetic induction) to generate a lagging magnetic force. Therefore, the air gap magnetic field has two distinct consciousnesses. The resultant magnetic potential is a rotating magnetic potential in a certain direction. The direction of rotation of the magnetic force is always from the unshielded part of the magnetic pole to the shaded pole, and here it is necessary to master the method of judging the direction of rotation of the motor. The rotating magnetic force is that the runner generated by the magnetic circuit enters the rotor, rotates around the rotor squirrel, induces an electric potential in the short-circuited rotor winding, and generates a rotor current. The rotor current interacts with the rotating magnetic field in the air gap. According to the left-hand law, the rotor conductor is stressed. Make the rotor turn. This is the most basic electromagnetic process that occurs in shaded-pole motors.
4. Classification of shaded pole motors
According to the shape and structure of the stator, cover motors are divided into convex cover motors and invisible cover motors.
Convex hood motor: The stator core is a square, rectangular or circular magnetic field frame, with protruding magnetic poles, and each magnetic pole has one or more short-circuit copper rings with auxiliary functions, that is, hooded poles. The concentrated winding of the salient pole is used as the main winding.
Invisible cover motor: The magnetic core of the stator is the same as that of an ordinary single-phase motor. The stator windings use scattered windings, the main windings are distributed in the stator slots, and the short-circuit copper rings are not used for the covering windings. Instead, the distributed windings are wrapped with thick enameled wires (self-shorting after connection), embedded in stator slots (about 1/3 of the total number of slots) to act as auxiliary groups. The main winding and the cover pole winding are spaced apart by a certain angle.
5. Advantages and disadvantages of shaded pole motors
1. The structure is simple, the manufacture is convenient, no windings and capacitors are added separately, it is suitable for mass production, and the cost is low.
2, low noise, no walkie-talkie will not disturb
3. The efficiency and power factor are low, and the slip is large.
4. Low operating performance and boot performance.
Sixth, the scope of application of the shaded pole motor
Shaded pole motors are typically used in small capacity situations starting with no or light loads, such as fans, electrical models, etc.