The structure of three-phase asynchronous motor consists of stator, rotor and other accessories.
Wiring in the motor terminal box:The motor terminal box has a wiring board, six ends of three-phase windings arranged on the two row, and the provisions of the top three wiring pile from left to right are numbered 1 (U1), 2 (V1), 3 (W1), while three binding posts arranged from left to right the number 6 (W2), 4 (U2), 5 (V2), the three-phase windings are connected to star connection or delta connection. All manufacturing and maintenance shall be arranged in this order.3, standFunction: fix stator core and front and rear end cover to support rotor, and protect, heat and so on.Structure: frame is usually cast iron parts, large induction motors, machine frame is generally welded with steel plate, micro motor base adopts cast aluminum parts. A radiating rib is arranged outside the frame of the closed motor to increase the radiating area, and the end cover of both ends of the protective motor is provided with a ventilating hole, so that the air inside and outside the motor can be directly convection, so as to be beneficial to heat dissipation.
2 stator windingFunction: it is the circuit part of the motor, through the three-phase alternating current, produces the revolving magnetic field.Structure: it consists of three windings which are separated from each other by 120 degrees of electric angle in space, and are arranged by the same structure. Each coil of the winding is embedded in each slot of the stator according to certain rules.The main insulation items of the stator winding are as follows: (to ensure the reliable insulation between the conductive part of the winding and the core and the reliable insulation of the winding itself); three.1) insulation to the ground: insulation between the stator windings and the stator core.2) interphase insulation: insulation between stator windings of each phase.3) turn to turn insulation: insulation between the turns of each stator winding.
(1) stator (stationary part)1 stator coreAction: a part of a magnetic circuit of a motor, with stator windings placed on it.Structure: the stator core is generally made of 0.35~0.5 mm thick surface silicon steel sheet with insulating layer and is superposed and pressed, and the inner circle of the iron core is uniformly distributed with slots for inserting stator windings.There are several kinds of stator core groove:Semi closed slot: the efficiency and power factor of the motor are higher, but the winding and insulation are difficult. Generally used in small low-voltage motors. Semi open slot: can be inserted into the forming winding, generally used for large and medium-sized low-voltage motors. The so-called winding, winding that can be pre insulated treatment, and then into the groove.Open slot: used for inserting and forming winding, the insulation method is convenient, mainly used in high voltage motor.
