CN-122003801-A - Motor and electric compressor provided with same

Abstract

The invention provides a motor capable of effectively realizing high-precision positioning of a bus unit and axial anti-drop. The motor is provided with a stator (21) and a bus bar unit (26), wherein the stator (21) is provided with an iron core (22) and an insulator (27) wound with magnetic wires (23), the bus bar unit (26) is formed by molding bus bars with resin (27), and the bus bars electrically connect the magnetic wires (23) extending from each slot (29) of the stator (21) with three-phase terminals (33). The iron core (22) has a key groove (31) formed on the outer periphery, and the bus bar unit (26) is formed with a claw (47) that engages with the key groove (31) to perform positioning in the circumferential direction with respect to the iron core (22), a press-in prevention portion (51) that defines the amount of press-in of the claw (47) into the key groove (31), and a drop-out prevention portion that engages with the insulator (27) to prevent drop-out from the iron core (22).

Inventors

• Honoto Ikuto
• MARK STEFAN

Assignees

• 三电株式会社

Dates

Publication Date

20260508

Application Date

20240913

Priority Date

20231013

Claims (7)

1. 1. A motor is provided with a stator and a bus bar unit, wherein the stator is provided with an iron core and an insulator which is arranged on the iron core and is wound with magnetic wires, the bus bar unit is formed by molding bus bars with resin, the bus bars electrically connect the magnetic wires extending from slots of the stator with three-phase terminals, The motor is characterized in that, The core has a key groove formed at an outer circumference, The busbar unit is provided with a claw portion that engages with the key groove to perform positioning in the circumferential direction with respect to the iron core, a press-in prevention portion that defines the press-in amount of the claw portion into the key groove, and a release prevention portion that engages with the insulator to prevent release from the iron core.
2. 2. The motor according to claim 1, wherein, The claw portion is formed with a slit cut from the tip toward the base portion.
3. 3. The motor according to claim 1, wherein, The busbar unit includes a circular ring portion in which the busbar and the three-phase terminals are molded and each of which protrudes from the resin, and a plurality of leg portions extending radially outward from the circular ring portion, the claw portion is formed at a tip end of each leg portion, the press-in prevention portion is formed at the leg portion at a base portion of the claw portion, and the drop-preventing portion is formed at an inner side surface of each leg portion.
4. 4. The motor according to claim 3, wherein, At least one of the leg portions is formed to extend outward from the annular portion at a position where the three-phase terminal is provided.
5. 5. The motor according to claim 4, wherein, The three-phase terminals are arranged on the circular ring part and The leg portions are formed at three portions of the annular portion, and two of the leg portions are formed to extend outward from the annular portion at positions where the three-phase terminals on both sides of the three-phase terminal are located.
6. 6. The motor according to claim 3, wherein, A plurality of welding connection parts protruding from the resin are arranged on the circular ring part, The magnetic wires protruding from the slots of the stator are welded to the welded connection portions to be electrically connected.
7. 7. An electric compressor, which is characterized in that, A motor and a compression element according to any one of claims 1 to 6 are housed in a container, and an inverter connected to the three-phase terminal is provided.

Description

Motor and electric compressor provided with same Technical Field The present invention relates to a motor formed by connecting magnet wires extending from slots of a stator to three-phase terminals of a bus bar unit obtained by resin molding a bus bar, and an electric compressor provided with the motor. Background Conventionally, a motor for driving a compression element of an electric compressor is configured by a stator and a rotor rotating inside the stator. The stator is composed of an iron core formed by laminating electromagnetic steel plates, a plurality of teeth protruding from the iron core in the inner radial direction, and magnet wires wound around the teeth, but since the iron core and the magnet wires need to be insulated, insulation between the iron core and the magnet wires is achieved by providing an insulator composed of insulating resin at the end of the iron core and winding the magnet wires around the insulator. A bus bar unit obtained by resin molding a bus bar made of metal and three-phase terminals (terminals connected to an inverter) is provided at an end portion (lead side) of the stator, and the magnetic wires extending from the slots of the stator are electrically connected to the three-phase terminals by the bus bar. In this case, the bus bar unit is conventionally fixed to the stator by a fixing force generated by welding the magnet wire and the bus bar, but this can hold only the magnet wire having a large diameter, and there is a problem that the holding force is lowered for the magnet wire having a small diameter. Accordingly, a structure has also been proposed in which a bus bar unit (a bus bar bracket in the following document) is engaged with and mounted on a core of a stator (for example, see patent document 1). According to this configuration, compared to the case where the bus bar unit (made of resin) is engaged with the resin insulator having a cumulative dimensional tolerance, the bus bar unit can be positioned in the circumferential direction with a high degree of accuracy by using the metal core which can be processed with a high degree of accuracy. WO2020/013078 However, in patent document 1, although positioning of the busbar unit (busbar holder) in the circumferential direction is possible, the axial detachment prevention of the busbar unit is only achieved by welding the magnetic wire to the busbar, and there is a risk that the busbar unit is detached in the axial direction for the small-diameter magnetic wire. Disclosure of Invention The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a motor capable of effectively realizing high-precision positioning of a bus bar unit and axial drop prevention, and an electric compressor including the motor. In order to solve the above problems, a motor according to the present invention includes a stator including a core and an insulator provided on the core and around which magnetic wires are wound, and a bus bar unit formed by molding a bus bar with resin, the bus bar electrically connecting the magnetic wires extending from each slot of the stator to a three-phase terminal, wherein the core has a key groove formed on an outer periphery, the bus bar unit includes a claw portion fitted into the key groove to perform positioning in a circumferential direction with respect to the core, a press-in prevention portion defining a press-in amount of the claw portion into the key groove, and a release prevention portion fitted into the insulator to prevent the release from the core. In the motor according to the invention of claim 2, the claw portion is formed with a slit cut from the tip end toward the base portion. The motor according to the invention of claim 3 is the motor according to the invention of claim 1, wherein the busbar unit has a circular ring portion in which the busbar and the three-phase terminals are molded and each of which protrudes from the resin, and a plurality of leg portions extending radially outward from the circular ring portion, claw portions are formed at tips of the leg portions, press-in prevention portions are formed at leg portions at base portions of the claw portions, and drop-preventing portions are formed at inner side surfaces of the leg portions. In the motor according to the invention of claim 4, at least one leg portion of the leg portions is formed to extend outward from the annular portion at the position where the three-phase terminal is provided. In the motor according to the invention of claim 5, the three-phase terminals are arranged in the annular portion, and the leg portions are formed at three portions of the annular portion, and two of the leg portions are formed to extend outward from the annular portion at positions where the three-phase terminals on both sides of the three-phase terminal are located. The motor according to the invention of claim 6 is the motor according to the invention of