Part of the three-phase asynchronous motor stator part is introduced

The stator is used to produce a rotating magnetic field. Three-phase motor stator generally consists of shell, stator core, stator winding and other parts. ( 1) Shell three-phase motor enclosure including frame, end cover, bearing cover, junction box and rings etc. Frame: cast iron or cast steel casting molding, its function is to protect and secure the three-phase motor stator winding. Medium and small three-phase motor frame and two end cover bearing rotor, it is an important part of three-phase motor mechanical structure. Usually, stand appearance for the cooling performance is good, so are generally cast with heat sink. End cover: cast iron or cast steel casting forming, its role is fixed in the center of the inner cavity of the stator, rotor makes the rotor rotate equably in the stator. Bearing cover: also cast iron or cast steel casting molding, the effect is a fixed rotor, the rotor can't axial movement, in addition to store oil and bearing protection. Junction box: general is cast iron casting, its function is to protect and secure winding wire terminals. Rings: are generally made of cast steel, installed in the upper frame, used for lifting, lifting three-phase motor. ( 2) The stator iron core is part of the magnetic circuit of the motor, asynchronous motor stator core by 0. 35毫米~ 0。 5 mm thick surface coated with varnish thin silicon steel sheet of the overlying and become, as shown in figure 2. Because of the silicon steel sheet is thinner and is insulation between the piece and piece, so reduced due to alternating magnetic flux through the core of the eddy current loss. Core circle has uniform distribution in the slot, which is used to embedded stator winding circles. ( 一) The stator core ( b） The stator laminations and plate diagram (figure 2 stator core 3) Stator winding of the stator winding is part circuit of three-phase motor, a three-phase winding three-phase motor, to the three-phase symmetrical current, can produce a rotating magnetic field. Three-phase winding is composed of three separate windings, and each winding are connected by a number of coil. Each winding is a phase, each winding in the spatial difference of 120 ° Angle. Insulated copper wire or insulated aluminum conductor coil winding. Use round more medium and small three-phase motor enameled wire, medium and large three-phase motor stator coil with a large section of the insulation of the flat copper wire or flat aluminum wire winding, embedded in the stator iron core slot according to certain rule again. Six of the stator three phase winding wire end have led to the junction box, head end respectively labeled U1, V1, W1, end respectively labeled U2, V2, W2. The six outlet end in the arrangement of the junction box as shown in figure 3, can connect into a star or triangle. ( 一) Star connection ( b） Triangle connection diagram 3 stator winding connection