JP2013094038A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening structure of a fastening cord such that the fastening cord never falls from an insulation cover even if the fastening cord slackens when a crossover led out of a terminal of a stator coil and connected to a power cable is fastened with the fastening cord and supported on the insulation cover.SOLUTION: A stator of a rotary electric machine comprises a stator core 1 having teeth formed at an inner periphery of a yoke, an insulation cover 2 which is put over the stator core to cover an inner peripheral surface of the yoke and peripheral surfaces of the teeth, and coils 3 wound around the teeth with the insulation cover 2 interposed. In a state where crossovers 4 led out of terminals of the coils 3 corresponding to respective phases are routed around in a peripheral direction and connected to a power cable 5, a fastening cord 7 is tied to the crossovers 4 and the power cable 5 to fasten and hold the insulation cover 2. A cord pass hole 2d for tying the fastening cord 7 to a peripheral wall part 2a of the insulation cover 2 is bored corresponding to the crossovers 4 of the coils and the power cable 5, and the fastening cord 7 is run through the cord pass hole 2d and tied.

Description

  The present invention relates to a stator of a rotating electrical machine intended for IPM motors, induction motors, and the like, and more specifically, a connecting wire drawn out from a terminal of a coil wound with an insulating cover on a stator core tooth, The present invention relates to a support structure in which a connection portion of a connected power cable is tied with a tie and tied with an insulating cover.

  As a stator of a head rotary electric machine, a stator core having a plurality of teeth extending along an inner periphery of an annular yoke is commonly referred to as an “insulator” that covers the inner peripheral surface of the yoke and the peripheral surface of the teeth. Cover the insulation cover, wind the coil around the circumference of each tooth in a concentrated manner through this insulation cover, and then route the crossover wire drawn from the end of the coil corresponding to each phase in the circumferential direction. 2. Description of the Related Art Conventionally, a wiring support structure has been adopted in which a cable is connected to a connecting portion of the connecting wire and the power cable, and a string is tied around an insulating cover.

  In addition, as a means for fixing the tie strap to the insulating cover, an engagement protrusion or a notch groove latching hook is formed on the bobbin portion of the insulating cover that covers the teeth of the stator core. There is known a structure in which a string is hooked to bind a connecting wire and a connecting portion between a coil and a power cable (for example, see Patent Documents 1 and 2).

JP-A-9-219959 JP 2010-213527 A

By the way, the tying method of the tying string disclosed in Patent Documents 1 and 2 has a problem that sufficient reliability cannot be secured for the supporting function.
That is, the binding string that ties the connecting wire pulled out from the end of the coil is bound and tied to the engagement protrusion or the notch groove formed on the insulating cover (bobbin member) that covers the teeth of the stator core. In the structure, if there is a slack in the tension of the binding string in the assembly process and it moves and the binding string comes off from the engagement hook of the insulating cover, the function of supporting the coil jumper wire and power cable is lost. As a result, there is a risk of causing an accident such as the hanging crossover wire touching the rotating rotor and breaking.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an improved stator coil crossover support structure that can solve the above-described problems and ensure a highly reliable binding function. is there.

To achieve the above object, according to the present invention, a stator core having a plurality of teeth formed along the inner periphery of the annular yoke, an inner peripheral surface of the yoke over the stator core, and a periphery of the teeth. An insulating cover that covers the surface and a coil wound around the teeth via the insulating cover, and a connecting wire drawn from the end of the coil corresponding to each phase is routed in the circumferential direction and connected to the power cable. In the stator of the rotating electrical machine that is bound and held by the insulating cover by tying the connecting wire and the connecting portion of the power cable,
Corresponding to the connecting wire of the coil and the power cable, a string passing hole for tying a string tied to the insulating cover is opened, and the connecting part of the connecting wire and the power cable is tied to the string passing hole through the string. Specifically, the insulating cover has an annular peripheral wall portion covering the inner peripheral surface of the yoke of the stator core, and protrudes from the peripheral wall portion toward the inner peripheral side of the stator core so that the teeth periphery of the stator core. A resin molded product having a bobbin portion covering the surface is formed, and a string passing hole for binding a string to the peripheral wall portion is opened (Claim 2).

  As described above, the coil connecting wire that is wound around the teeth of the stator core and routed in the circumferential direction, and the power cable connected to the connecting wire are tied with the tying cord, and then the tying cord is attached to the wall surface of the insulating cover Even if the tie string is loosened by tying it through the pierced hole that is opened in the cable, the tie string may come off from the engagement hook formed on the insulating cover as in the conventional structure, and the binding function may be lost. This ensures a stable binding function and high reliability.

FIG. 2 is an assembly structure diagram of a stator according to an embodiment of the present invention, where (a) is an end view and (b) is a side view of (a). It is an expanded sectional view along XX of FIG. It is a block diagram of the stator core in FIG. 1, Comprising: (a) Front view, (b) is a side view. It is a block diagram of the connection side insulation cover in FIG. 1, (a) is a front view, (b) is an external perspective view.

Embodiments of the present invention will be described below based on the examples shown in FIGS.
In each figure, 1 is a stator core (see FIGS. 3 (a) and 3 (b)) composed of a punched laminate of electromagnetic steel sheets in which a plurality of teeth (magnetic pole portions) 1b are formed along the inner periphery of the annular yoke 1a. Reference numeral 2 denotes an insulating cover having a two-part structure that covers the inner peripheral surface of the yoke 1 a and the peripheral surface of each tooth 1 b and is fitted to both ends of the stator core 1, and 3 denotes the stator core 1 through the insulating cover 2. Coil wound around each tooth 1b in a concentrated winding manner, 4 is a crossover wire drawn from the terminal of the coil 3 corresponding to each phase, and is routed in the circumferential direction of the core 1, 5 is a power cable connected to the crossover wire 5, 6 Is an insulating tube covering the connection portion of the power cable 5, and 7 is a binding string that is bound to the insulation cover 2 as will be described later, in the middle of the connecting wire 4 and to the connection portion of the power cable 5.

  Here, the insulating cover 2 on the cable connection side includes an annular peripheral wall portion 2a that covers the inner peripheral surface of the yoke 1a of the stator core 1 as shown in FIGS. 4A and 4B, and the peripheral wall portion 2a. It is a resin molded product having a bobbin portion 2b that protrudes to the inner peripheral side and covers the peripheral surface of the tooth 1b, and a peripheral bar 2c is left on the peripheral wall portion 2a corresponding to the binding portion of the tied string 7 described above. A rectangular window-shaped string passage hole 2d through which the string 7 is tied to the wall surface is formed.

  In the assembly process of the stator, the connecting wire 4 corresponding to each phase drawn from the terminal of the coil 3 wound around the core tooth 1b with the insulating cover 2 fitted to the stator core 1 in the circumferential direction. The power cable 5 is covered with an insulating tube 6. In this assembled state, the tie string 7 is tied to the middle part of the crossover 4 and the connection part of the power cable 5, and the tie string 7 is opened to the peripheral wall 2a of the insulating cover 2 as shown in FIG. Tie it through the string hole 2d.

  As a result, even if the tying string 7 is loosened in the assembled state of the stator, the tying string can be removed from the engagement hook formed on the insulating cover as in the conventional structure, and the binding function can be lost. Secure binding function and reliability.

  In the illustrated embodiment, the connecting wire 4 that is pulled out from the terminal of the coil 3 and connected to the power cable 5 and the binding string 7 that binds the power cable 5 are described. However, the coil terminals of each phase are connected to each other. It goes without saying that the same can be applied to the connecting wire on the neutral point side.

DESCRIPTION OF SYMBOLS 1 Stator core 1b Teeth 2 Insulation cover 2a Peripheral wall part 2b Bobbin part 2d String through hole 3 Coil 4 Crossover 5 Power cable 7 Tie string

Claims (2)

A stator core having a plurality of teeth formed along the inner periphery of the annular yoke, an insulating cover that covers the stator core and covers the inner peripheral surface of the yoke and the peripheral surface of the teeth, It consists of a coil wound around the teeth, and the connecting wire drawn from the coil terminal corresponding to each phase is routed in the circumferential direction and connected to the power cable, and then tied to the connecting wire and the connecting portion of the power cable. In the stator of a rotating electrical machine that is bound and held by an insulating cover,
Corresponding to the connecting wire of the coil and the power cable, a string passing hole for tying a string tied to the insulating cover is opened, and the connecting wire and the power cable are tied to the string passing hole through the string. The stator of a rotating electrical machine.   2. The stator according to claim 1, wherein the insulating cover covers the inner peripheral surface of the stator core yoke, and projects from the peripheral wall portion toward the inner peripheral side to cover the teeth peripheral surface of the stator core. A stator for a rotating electrical machine, wherein the stator is a resin molded product having a bobbin portion, and a string-through hole is opened in the wall surface of the peripheral wall portion.