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Here is a detailed description of the 120kW to 180kW motor stator core assembly for new - energy vehicles:
Overall Structure
The stator core assembly is a crucial part of the motor, mainly composed of the stator core, winding, and various fastening components. It is fixed in the motor casing and cooperates with the rotor to achieve the energy conversion of the motor.
Stator Core
- Material: Usually made of 0.2 - 0.25mm - thick non - oriented silicon - steel sheets, such as B20AV1300. These silicon - steel sheets have excellent magnetic conductivity and low - loss characteristics, which can reduce eddy - current loss and hysteresis loss when the motor is running.
- Structure: Composed of multiple silicon - steel sheets laminated together. There are 48 slots on the silicon - steel sheets of the 150 - kW motor stator, which are used to place windings2. The lamination process can limit eddy currents within a narrow gap, increase the resistance of the loop, and improve the efficiency and performance of the motor4. The outer diameter of the stator core is generally within the range of φ150 - φ250mm, and the inner diameter is within the range of φ90 - φ190mm.
Winding
- Material: Usually uses circular copper wire with a diameter of 0.83mm2. Copper has good electrical conductivity and thermal conductivity, which can meet the requirements of high - power motor applications.
- Winding Mode: Each slot has 9 turns, and it is wound into a three - phase winding2. The winding is placed in the slot of the stator core, and the two - phase winding resistance at 23°C is 16.5mΩ±3%2. The insulation resistance to the ground is greater than 100 megohms (at 1000V for 5s)2.
Fastening Components
- Function: Used to press the stator core and winding into a whole to ensure the stability and reliability of the stator core assembly. Common fastening methods include external pressure mounting for integral circular punching sheets and internal pressure mounting for sector - shaped punching sheets1.
Technical Requirements
- Good Magnetic Conductivity and Low Loss1: The stator core should have excellent magnetic conductivity to ensure the smooth passage of the magnetic flux in the motor, and at the same time, have low - loss characteristics to improve the efficiency of the motor.
- High Rigidity and Vibration Resistance: It can withstand the electromagnetic force and mechanical vibration generated during the operation of the motor to ensure the stable operation of the motor.
- Good Ventilation Effect: There should be a reasonable ventilation structure to facilitate the heat generated during the operation of the motor to be dissipated in a timely manner to avoid overheating of the motor.
- High Dimensional Accuracy: The inner diameter and slot size of the core after lamination should meet the design accuracy requirements1.
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