Variable turn-number flat-wire motor stator winding

Abstract

The invention discloses a variable turn-number flat-wire motor stator winding. The variable turn-number flat-wire motor stator winding comprises a stator iron core and all phase coils which are wound around the stator iron core through the adoption of flat wires, the phase coils are all wound by no less than two flat wires, the variable turn-number flat-wire motor stator winding further comprises a winding wiring switch device for switching wiring modes of each flat wire of the phase coils, and the wiring modes of each flat wire of the phase coils comprises a one-path series connection mode and a multi-path parallel connection mode. According to the variable turn-number flat-wire motor stator winding, the wire outlet end of the stator winding is always kept as a 'star' connection, a reasonable stator winding structure and the switching device are arranged to achieve that the turn number of the winding is large when a more is at a low speed and the winding is switched to be in a state of small turn number when the motor is at a high speed, the greater low-speed output torque and higher high-speed output power of the motor are achieved, and therefore the motor efficiency is improved, the temperature rising performance of the motor is improved, when the winding is in the states of one-path series connection and two-path parallel connection, all winding coils are utilized, and the waste of materials and space is avoided.

Description

technical field [0001] The invention relates to a motor stator winding structure, more specifically a variable-turn flat wire motor stator winding applied to an electric vehicle drive motor. Background technique [0002] The winding structure of the flat wire motor is simple and the line shape is regular. However, when the voltage and current are limited, there is a certain contradiction in order to increase the low-speed torque and high-speed power at the same time. Switching the "star" connection to the "delta" connection can increase the torque when the motor starts, but the "delta" connection has the problem of three-phase voltage imbalance. [0003] In the prior art, the main way to increase the low-speed torque and high-speed power at the same time is to increase or decrease the number of turns of the winding at different speeds. For example, the utility model patent (CN 201629625 U) provides a stator winding outlet terminal terminal board for a rare earth permanent m...

AI Technical Summary

Problems solved by technology

However, the reduced number of turns in this scheme has not been utilized, which wastes both space and materials

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