First, the stator windings form magnetic poles to distinguish:
Stator windings can be divided into explicit pole type and ordinary pole type according to the relationship between the number of motor poles and winding distribution.
Explicit magnetic pole winding
In salient pole winding, each coil (group) forms a magnetic pole, and the number of coils (groups) of the winding is equal to the number of magnetic poles. In salient pole winding, in order to keep the polarities n and s of magnetic poles away from each other, the current directions in two adjacent coils (groups) must be opposite, that is, the injection mode of two adjacent coils (groups) must be tail-to-tail and head-to-head (electrician's terminology is "tail-to-tail, head-to-head"), that is, the reverse series connection mode.
Ordinary magnetic pole winding
In the common pole winding group, each coil (group) forms two magnetic poles, and the number of coils (groups) of the winding is half of the number of magnetic poles, because the other half of the magnetic poles are formed by the magnetic lines of the magnetic poles generated by the coils (groups). In common-pole winding, the polarity of magnetic poles formed by each coil (group) is the same, so the current direction in all coils (groups) is the same, that is, the injection mode of two adjacent coils (groups) should be tail-to-tail (called "tail connection" in electrician's terminology), that is, the sequential series connection mode.
Second, according to the stator winding shape and embedded connection mode.
Stator windings can be divided into centralized and distributed types according to different winding shapes and embedded connection modes.
Concentrated winding
Usually, the concentrated winding consists of only one or several rectangular frame coils. After winding, it is wound and shaped with yarn tape, then dipped in paint and dried, and then embedded in salient pole core. This kind of winding is used for DC motors, excitation coils of general motors and mainboard windings of unidirectional shaded pole motors.
Distributed winding
The distributed winding motor stator has no salient pole palm, and each magnetic plate is composed of one or several coils embedded and connected according to certain rules to form a coil group. According to the different embedded wiring forms, distributed windings can be divided into concentric and overlapping types.
(1) concentric winding concentric winding is a pattern in which several rectangular coils with different sizes in the same coil group are embedded one by one at the same central position and arranged in a zigzag pattern. Concentric winding is divided into single layer and multi-layer. This kind of stator winding is used in general single motor and some low-power three-phase asynchronous motors.
(2) Overlapping winding is a type in which all coils have the same shape and size (except double coils). Each slot is embedded with a coil edge, and the ends outside the slot are stacked one by one and evenly distributed. Overlapping windings are divided into single-layer overlapping and double-layer overlapping. Only one side of the coil embedded in each slot is single-layer wound or single-layer wound; Each slot is embedded with two coil sides (upper and lower layers) belonging to different coil groups, which are double-layered winding or double-layered winding. Overlapping windings can be divided into single double-ring cross wiring arrangement and single double-layer mixed wiring arrangement because of different embedded wiring modes. In addition, the shapes embedded from the winding ends are called chain windings and basket windings, but they are actually overlapping windings. The stator windings of three-phase asynchronous motors generally adopt overlapping windings.
Note: each phase has only a head and a tail, and there is no joint in the middle. When assembling the production line, always remember to pull out the handle and reverse it. Finally, there are only six heads, head and tail, and there are no joints between them. The winding is cross-shaped, and the motor windings are chain-shaped, concentric and cross-shaped. Above 15 kW, it is a double-layer buried mode, and the wiring is a multi-channel connection mode. Repairing the motor requires technology, practice makes perfect, and repairing the submersible pump requires higher technology, with light, fast and steady hands.
Extended answer:
Motor: It is a kind of equipment that converts electric energy into mechanical energy. It uses the electrified coil (stator winding) to generate a rotating magnetic field, which acts on the rotor (such as squirrel-cage closed aluminum frame) to form a magnetoelectric rotating torque. According to different power sources, motors are divided into DC motors and AC motors. The motors in the power system are mostly AC motors, which can be synchronous motors or asynchronous motors (the stator magnetic field speed of the motor is not synchronized with the rotor speed). The motor is mainly composed of stator and rotor, and the direction of electrified conductor in magnetic field is related to the direction of current and magnetic induction line (magnetic field direction). The working principle of the motor is that the magnetic field acts on the current to make the motor rotate.
References:
Baidu encyclopedia? electric motor