What is the structure of a Siemens electric motor

Date:2022-01-22 13:58:39

 1. Stator core

Function: A part of the motor magnetic circuit, on which the stator winding is placed.

Structure: The stator core is typically made of 0.35~0.5mm thick silicon steel sheets with an insulating layer on the outer surface, which are punched and laminated together. The inner circumference of the core is punched with evenly distributed slots for embedding the stator windings.

There are several types of stator dead slot profiles:

Half-closed slot: The efficiency and power factor of the motor are relatively high, but the winding embedding and insulation are more difficult. It is commonly used in small low-voltage motors.

Semi-open slot: It can accommodate formed windings, commonly used in large and medium-sized low-voltage motors. The so-called formed windings are windings that can be pre-insulated before being placed in the slot.

Open slot: used to embed the formed winding, with convenient insulation method, mainly used in high-voltage motors.

2. Stator winding

Function: It is a part of the motor circuit that, when three-phase alternating current is applied, generates a rotating magnetic field.

Structure: It consists of three structurally identical windings arranged symmetrically at 120° electrical angle intervals in space, with each coil of these windings embedded in the stator slots according to a certain pattern. The main insulation items of the stator winding include the following three types: (ensuring reliable insulation between each conductive part of the winding and the core, as well as reliable insulation between the windings themselves).

(1) Ground insulation: The insulation between the entire stator winding and the stator core.

(2) Interphase insulation: The insulation between the stator windings of each phase.

(3) Inter-turn insulation: The insulation between the wire turns of each phase of the stator winding.

Wiring inside the motor junction box:

Inside the motor junction box, there is a terminal block where the six wire ends of the three-phase winding are arranged in two rows. The three terminal studs in the upper row are numbered 1(U1), 2(V1), and 3(W1) from left to right, while the three terminal studs in the lower row are numbered 6(W2), 4(U2), and 5(V2) from left to right. The three-phase winding is connected in either a star connection or a delta connection. During manufacturing and maintenance, this sequence should be followed.

3. Machine base

Function: Fix the stator core and the front and rear end covers to support the rotor, and serve the purposes of protection and heat dissipation.

Structure: The frame is typically made of cast iron. For large asynchronous motors, the frame is commonly welded from steel plates, while for micro motors, it is made of cast aluminum. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling ribs on the outside to increase the heat dissipation area. The frame of enclosed motors has cooling.