CN217607572U

CN217607572U - Improved stator core structure of brushless motor

Info

Publication number: CN217607572U
Application number: CN202221648984.0U
Authority: CN
Inventors: 张晓波; 陈善章; 刘代友
Original assignee: Shanghai Shenghuabo Automobile Electric Appliance Co ltd
Current assignee: Shanghai Shenghuabo Automobile Electric Appliance Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-10-18
Anticipated expiration: 2032-06-28

Abstract

The utility model discloses an improvement type brushless motor's stator core structure, including stator core circumference interval is crisscross to be provided with a plurality of wire casings and a plurality of tooth, a serial communication port, the groove perpendicular to the sectional area inequality of stator core axis. The utility model discloses make the full rate in groove in each groove be close, can maximize utilization groove space, possess great torque density and power density.

Description

Improved stator core structure of brushless motor

Technical Field

The utility model relates to a brushless motor technical field, in particular to brushless motor's stator core structure.

Background

The brushless direct current motor is composed of a motor main body and a driver, and is a typical mechatronic product. Because the brushless direct current motor runs in a self-control mode, a starting winding is not additionally arranged on a rotor like a synchronous motor which is started under the condition of heavy load under the condition of frequency conversion and speed regulation, and oscillation and step-out can not be generated when the load suddenly changes. The permanent magnet of the brushless DC motor with medium and small capacity is mostly made of rare earth neodymium iron boron (Nd-Fe-B) material with high magnetic energy level. Therefore, the volume of the rare earth permanent magnet brushless motor is reduced by one machine seat number compared with that of a same-capacity three-phase asynchronous motor.

Referring to fig. 1, a stator core of a brushless motor generally adopts a groove shape (a plurality of pear-shaped grooves and sloping shoulder circular bottom grooves) with equal tooth width, and all the tooth areas and the groove areas are equal. Referring to the 4-level 6 slots in fig. 2, for reasons of structure and batch manufacturing, the outgoing lines and passing lines of the winding are often on different surfaces, which causes a problem that the number of conductors in a part of slots is increased by 2, resulting in different slot filling ratios of the slots, fewer conductors and underutilized slot space.

To solve the problem of slot fullness, the chinese patent application publication No. CN112421816A discloses a novel unequal-area transposed flat-wire winding permanent magnet motor, which includes a large-area flat-wire winding and a split flat-wire winding placed inside a stator core slot.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the unable maximize that the cell type that tooth width generally adopted to brushless motor's stator core exists utilizes the groove space, can't possess great torque density and power density's problem and provide one kind can make full use of groove area, make each groove full rate be close the same improvement type brushless motor's stator core structure to improve torque density and power density.

In order to realize the above object of the present invention, the utility model discloses an improvement type brushless motor's stator core structure, including stator core circumference interval is crisscross to be provided with a plurality of wire casings and a plurality of tooth, its characterized in that, the groove perpendicular to the sectional area inequality of stator core axis.

In a preferred embodiment of the present invention, the cross-sectional area of the stator core axis perpendicular to the slots having the larger number of conductors passing therethrough is larger than the cross-sectional area of the stator core axis perpendicular to the slots having the smaller number of conductors passing therethrough, so that the slot fullness of each slot is close.

In a preferred embodiment of the present invention, the number of grooves and the number of teeth are both an even number.

In a preferred embodiment of the present invention, each tooth is a helical tooth, i.e. the extension line of the center of each tooth does not cross the center of the stator core.

Since the technical scheme as above is adopted, the utility model discloses make the groove fullness rate in each groove be close, can the maximize utilize groove space, possess great torque density and power density.

Drawings

Fig. 1 is a schematic view of a stator core of a conventional brushless motor.

Fig. 2 is a winding diagram of a 4-stage 6-slot stator core for the conventional brushless motor shown in fig. 1.

In the figure:

reference numerals

1, 2, 3, 4, 5, 6 denote the number of slots, 9, 10 denote the number of conductors, a, B, C and x, y, z denote three phases of the brushless motor.

Fig. 3 is a schematic diagram of a stator core structure of a brushless motor according to the present invention.

Fig. 4 is a winding diagram of a stator core of a 10-stage 12-slot brushless motor according to the present invention.

In the figure: 1. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 denote the number of slots, 9, 10 denote the number of conductors, a, B, C and x, y, z denote the three phases of the brushless motor.

Detailed Description

The following description of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 3, the stator core structure of the improved brushless motor shown in the figure includes a stator core 20, six

wire slots

21a, 21b, 21c, 21d, 21e, 21f and six

teeth

22a, 22b, 22c, 22d, 22e, 22f are alternately arranged in the circumferential direction of the stator core 20 (the number of the slots and the number of the teeth may be the rest even numbers), and the cross-sectional area of the

slots

21a, 21c, 21e perpendicular to the axis of the stator core 20 is not equal to the

slots

21b, 21d, 21 f. In particular, the cross-sectional area of the

slots

21a, 21c, 21e having the larger number of through-conductors perpendicular to the axis of the stator core 20 is larger than the cross-sectional area of the

slots

21b, 21d, 21f having the smaller number of through-conductors perpendicular to the axis of the stator core 20, so that the slot fill ratios of the

slots

21a, 21b, 21c, 21d, 21e, 21f are close to each other.

Each

tooth

22a, 22b, 22c, 22d, 22e, 22f is a helical tooth, i.e. the extension of the center of each

tooth

22a, 22b, 22c, 22d, 22e, 22f does not pass through the center of the stator core 20.

Referring to fig. 4, the above-described stator core is also suitable for a 10-stage 12-slot winding.

Claims

1. The utility model provides an improvement type brushless motor's stator core structure, includes stator core circumference interval is crisscross to be provided with a plurality of wire casings and a plurality of tooth, its characterized in that, the groove perpendicular to the sectional area inequality of stator core axis.

2. An improved brushless motor stator core structure as claimed in claim 1, wherein the cross-sectional area perpendicular to the stator core axis through the slots with the larger number of conductors is larger than the cross-sectional area perpendicular to the stator core axis through the slots with the smaller number of conductors, so that the slot fill ratios of the slots are close.

3. An improved brushless motor stator core structure as claimed in claim 1 or 2, wherein the number of slots and the number of teeth are even numbers.

4. An improved brushless motor stator core structure as claimed in claim 3, wherein each tooth is a skewed tooth, i.e. the extension line of the center of each tooth does not go through the center of the stator core.