Square copper wire motor stator structure

Abstract

The present invention discloses a square copper wire motor stator structure. The motor stator includes a stator core and a stator winding. The stator winding is disposed on the stator core, and the stator winding is a four-layer structure on the stator core. The stator winding is composed of square copper wires having square cross sections, and the stator winding comprises a first layer conductor,a second layer conductor, a third layer conductor and a fourth layer conductor from the outer circle to the inner circle of the stator in order. The stator winding is two sets of winding structures,the first layer and the second layer of conductors form a first set of windings, the third layer conductor and the fourth layer conductor form a second set of windings, the first set of windings is electrically isolated from the second set of windings, a dual-winding motor structure and different winding connection modes are utilized to achieve difference voltages and voltage distribution so as toimprove the redundancy and reliability of the system, and by using the square copper wires, the bare copper occupation rate in the tank and the motor power density are greatly increased.

Description

technical field [0001] The invention relates to a motor stator structure, in particular to a stator winding structure of a double-winding motor using square copper wires. Background technique [0002] The general motor stator structure is usually related to the winding structure, which can be divided into a distributed winding stator structure and a centralized winding stator structure. The distributed winding stator structure is generally an integrated parallel tooth stator punching structure, and the corresponding pitch windings are wound in advance. Finally, the wire can be embedded manually or by machine. The distributed winding stator structure has the characteristics of small torque fluctuation and low harmonic content, but the winding is generally made of multiple round copper wires wound in parallel. The low copper area ratio and high end length are not conducive to further improving efficiency and power density; the centralized winding stator structure includes an i...

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Problems solved by technology

[0002] The general motor stator structure is usually related to the winding structure, which can be divided into a distributed winding stator structure and a centralized winding stator structure. The distributed winding stator structure is generally an integrated parallel tooth stator punching structure, and the corresponding pitch windings are wound in advance. Finally, the wire can be embedded manually or by machine. The distributed winding stator structure has the characteristics of small torque fluctuation and low harmonic content, but the winding is generally made of multiple round copper wires wound in parallel. The low copper area ratio and high end length are not conducive to further improving efficiency and power density; the centralized winding stator structure includes an integral stator and a segmented block stator. The integral stator can be completed by manually inserting wires, but The end height is relatively large, and the production efficiency is low. The one-piece stator can also be completed by automatic machine winding, but the slot fill rate is low. The segmented block stator generally uses a single stator winding and then spliced ​​​​to form the entire stator. method, the end height is small, but the concentrated winding stator structure generally has large torque fluctuations and high harmonic content, and the bare copper occupation rate in the slot is not too high, which is not conducive to further improving the power density

[0003] With the continuous increase of motor power demand, for motor applications that require frequency conversion and speed regulation, the three-phase motor system is generally realized by two schemes of low voltage and high current or high voltage and low current. For the low voltage and high current scheme, it is subject to The limit of the maximum allowable current of the power device, the selection and cost of the inverter power device are not easy to control. For the high-voltage and low-current scheme, the du / dt will increase when the inverter supplies power, which will require the motor to have a higher The insulation level increases the cost of the motor and the difficulty of material selection. In the failure mode of the system phase loss, the winding current of the three-phase motor rises sharply, and the vibration and noise increase, which affects the operating performance and life of the system, and the reliability is poor. , for new energy vehicles and other occasions that require high motor reliability, the above shortcomings need to be improved urgently

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