Three-phase stator winding, motor stator assembly and motor

Abstract

The invention belongs to the field of motors, and discloses a three-phase stator winding, a motor stator assembly and a motor. The three-phase stator winding comprises N layers of hairpin windings which are stacked in sequence, hairpin coils in the first layer of hairpin winding and the N layer of hairpin winding are overlines on the same layer, the span of each hairpin coil in the first layer of hairpin winding is a first short pitch, and the span of each hairpin coil in the N layer of hairpin winding is an integral pitch; the hairpin coils from the second layer of hairpin winding to the (N-1) layer of hairpin winding are different-layer crossover lines; in the same-phase stator winding, the end parts of the adjacent hairpin coils are directly welded; and N is larger than or equal to 4. According to the invention, the purpose of optimizing the stator winding end part welding process and the height of the welded end part is achieved through short-distance arrangement.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a three-phase stator winding, a motor stator assembly and a motor. Background technique [0002] With the development of new energy vehicles, the requirements for permanent magnet synchronous motors for vehicles are getting higher and higher. While satisfying the power performance, they also pursue ride comfort. However, the noise generated when the motor is working has always been a difficult problem for engineers. In order to reduce the noise generated by electromagnetic excitation as much as possible, the back electromotive force of the motor is required to have good sinusoidal properties. Therefore, when designing the arrangement structure of the motor windings, electromagnetic engineers often use short-distance arrangements to reduce the back electromotive force. The 5th and 7th harmonics in [0003] like Figure 4 and Image 6 As shown, due to the high proportion of the...

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Problems solved by technology

[0003] like Figure 4 and Image 6 As shown, due to the relatively high proportion of the 5th and 7th harmonics, the sinusoidality of the waveform of the line back electromotive force of the three-phase stator windings arranged at full intervals is poor, resulting in high electromagnetic noise

[0004] like figure 1 As shown, there is a stator winding of a motor. The outer end of the winding arrangement is optimized by making the hairpin coil into a short-pitch span and a full-pitch span, but the winding method is only suitable for the full-pitch winding arrangement. If the short-distance winding arrangement is adopted, the winding method cannot complete all the adjacent (note: refers to the adjacent or electrically adjacent in the winding path, rather than the adjacent in space position) outer ends of the winding For direct soldering connection, it is necessary to use more bridge wires on the same layer for connection. figure 1 Taking the B-phase winding as an example, the 8-slot 1-layer coil is connected to the 14-slot 1-layer coil through the same-layer bridge wire, and the 13-slot 4-layer coil is connected to the 20-slot 4-layer coil through the same-layer bridge wire. Coil, the 14-slot 4-layer hairpin coil is connected to the 19-slot 4-layer hairpin coil through the same-layer bridge wire, which will also increase the number of special-shaped hairpin coils, which will not only bring great challenges to the welding process, but also because the bridge wire Superimposed arrangement at the end to be welded, which inevitably increases the height of the end after welding and reduces the torque density of the motor

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