Stator winding configuration of three-phase electric motor

Abstract

The invention discloses a stator winding configuration of a three-phase electric motor. The stator winding configuration comprises a three-phase coil and a plurality of coil slots, wherein the three-phase coil comprises a first phase coil body, a second phase coil body and a third phase coil body which are arranged inside the plurality of coil slots sequentially from outside to inside, the three-phase coil is composed of copper wires and aluminum wires, the copper wire and the aluminum wire in each phase coil body are in series connection, aluminum wires in two phase coil bodies are connected with the copper wire in the rest phase coil body, copper wires and aluminum wires in each phase coil body are provided with n units in coil slots respectively, n is a natural number lager than 1, copper wire units and aluminum wire units in each phase coil body are distributed inside the plurality of coil slots alternately, and only two phases of identical aluminum wires or copper wires are arranged in each of the coil slots for the three-phase coil. The stator winding configuration solves the problem that a winding of the electric motor is burnt due to the fact that heating is centralized at one position when the three-phase electric motor is connected with a large current.

Description

technical field [0001] The invention relates to a stator winding arrangement for a three-phase electric machine. Background technique [0002] The coils in some motor windings are only made of copper, but if the coils in the motor windings are only made of copper, the weight of the motor will become heavier due to the large specific gravity of the copper wire, so in order to reduce the weight of the motor, some motors at this stage will be A part of the copper wire coil of the motor winding is changed to an aluminum wire coil. Now the copper wire and the aluminum wire in the motor winding of the three-phase motor are deviated, such as figure 1 , figure 2 As shown, there are multiple aluminum wire units 9 and copper wire units 10 in each phase coil, and the aluminum wire units 9 and copper wire units 10 in each phase coil are alternately distributed in the coil slots 11, and the three-phase coil The aluminum wire units 9 in the three-phase coil are staggered and scattered,...

AI Technical Summary

Problems solved by technology

[0002] The coils in some motor windings are only made of copper, but if the coils in the motor windings are only made of copper, the weight of the motor will become heavier due to the large specific gravity of the copper wire, so in order to reduce the weight of the motor, some motors at this stage will be A part of the copper wire coil of the motor winding is changed to an aluminum wire coil. Now the copper wire and the aluminum wire in the motor winding of the three-phase motor are deviated, such as figure 1 , figure 2 As shown, there are multiple aluminum wire units 9 and copper wire units 10 in each phase coil, and the aluminum wire units 9 and copper wire units 10 in each phase coil are alternately distributed in the coil slots 11, and the three-phase coil The aluminum wire units 9 in the three-phase coil are staggered and scattered, causing multiple aluminum wire units 9 in the three-phase coil to overlap in part of the coil slots 11. Since the resistance of the aluminum wire in the three-phase coil is greater than that of the copper wire, the aluminum wire with a large resistance It is easier to generate heat than copper wire. The aluminum wire unit in the overlapping three-phase coil makes the temperature of the aluminum wire of the motor winding rise significantly. When the three-phase motor passes a large current, there is a defect that the motor winding is burned

Images