The motor of ceiling fan is different from ordinary motor, it is an external rotor motor, that is, its middle part is stator winding, and the part connecting external blades is rotor.
The fixed part of the motor is the stator, which is equipped with pairs of static main poles excited by DC; The rotating part (rotor) is called armature core, and the armature winding is installed on the armature core.
After electrifying, induced electromotive force is generated, which is used as a rotating magnetic field to generate electromagnetic torque for energy conversion. Stator winding can be divided into centralized type and distributed type according to the shape and embedding mode of coil winding.
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Difference and function between stator and rotor of motor;
Stator and rotor are necessary parts of motor. The stator is fixedly installed on the shell, and usually, the coil is wound on the stator. The rotor is installed and fixed on the machine base through bearings or shaft sleeves. There are silicon steel sheets and coils on the rotor. Under the action of the coil, the current will generate a magnetic field on the silicon steel sheets of the stator and rotor, thus driving the rotor to rotate.
The stator of asynchronous motor consists of stator core, stator winding and frame;
1, stator core
The stator core is used as a part of the magnetic circuit of the motor and embedded in the stator winding. The stator core is formed by laminating silicon steel sheets with a thickness of 0.5 mm, and both sides of the brick-shaped steel sheets are coated with insulating paint to insulate the steel sheets from each other, so as to reduce the core loss caused by the rotating magnetic field in the stator core. The inner circle of the stator core is stamped with several identical slots for embedding the stator winding.
2. Stator winding
Stator winding is the circuit part of the motor, and its main function is to generate induced potential through current and realize the conversion of electromechanical energy. The distribution of winding coils in stator slots can be divided into single layer and double layer. In order to obtain better electromagnetic performance, medium and large asynchronous motors adopt double-layer short-distance windings.
3. Stator frame
The main function of the frame is to fix and support the stator core, so it is required to have sufficient mechanical strength and rigidity to withstand various forces during motor operation or transportation. Small and medium-sized AC motors-generally use cast iron base, for large-capacity AC motors, generally use steel plate welder base.
The rotor of asynchronous motor consists of rotor core, rotor winding and rotating shaft;
1, rotor core
Rotor core is a part of motor magnetic circuit. Together with the stator core and air gap, it forms the whole magnetic circuit of the motor. Generally, 0.5mm thick silicon steel sheets are stacked in the rotor core. Most of the rotor cores of small and medium-sized AC motors are directly mounted on the motor shaft. The rotor core of a large AC motor is installed on a rotating bracket which is sleeved on the rotating shaft.
2. Rotor winding is used to induce potential, flow current and generate electromagnetic torque, and its structural forms are squirrel cage type and winding type.
1) squirrel cage rotor
Squirrel cage rotor winding is a self-closing winding. A guide rod is inserted into each slot, and two end rings are respectively connected with the two ends of all the guide rods at the notches extending out of the two ends of the iron core. If the iron core is removed, the whole winding looks like a "round cage", so it is called a squirrel-cage rotor.