JPH02131338A - Stator core for motor - Google Patents

Abstract

PURPOSE:To improve the strength of stator by fitting an inner circumferential structure having a plurality of pole pieces arranged with predetermined interval and jointed with non-magnetic reinforce boards projecting radially from one end face thereof to a tubular outer circumferential section composed of lamination of thin boards. CONSTITUTION:A plurality of thin annular electromagnetic steel boards are laminated to form a tubular outercircumferential structure 1. A plurality of I-shaped pole pieces 3 are arranged in the circumferential direction with gap S and laminated to form a slot 4. Non-magnetic reinforcing boards 5 having radially projecting overlapped section 7 are jointed in bridge-shape to at least one end face of the lamination block, then adjoining pole pieces 3 are coupled at the coupling section 6, thus forming an innercircumferential structure 2. Then the inner circumferential structure 2 is fitted to the outer circumferential section 1. By such arrangement, a stator core having excellent strength can be manufactured easily.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a stator core for an electric motor, which is composed of an outer peripheral structure and an inner peripheral structure, and the inner peripheral structure is divided in the circumferential direction. be.

[Prior Art] A stator core is composed of an outer circumferential structure and an inner circumferential structure, and has outward-opening slots formed in the inner circumferential structure so that windings can be mounted using a flyer winding method, for example. Kaisho 5
It is disclosed in the publication No. 8-33945. In the structure disclosed in the above-mentioned publication, each magnet tf1 of the inner peripheral structure is connected by a discontinuous portion of a slit. The slit is a structure to prevent the flow of leakage magnetic flux to the adjacent magnetic flux, which reduces the efficiency of the electric power machine. In this case, thin plates divided into magnetic poles are laminated, and a series of thin plates with magnetic poles are sandwiched in the circumferential direction with a predetermined gap between them, or the thin plates are arranged in layers on the end face side. ing.

[Problems to be Solved by the Invention] In the above-mentioned conventional stator core, each magnetic pole of the inner peripheral structure is still connected in a state where leakage magnetic flux can flow, which only causes problems in terms of efficiency. The solution is that if a stack of thin plates separated for each magnetic pole is connected by a series of single plates made of the same material, not only will magnetic flux leak, but the strength of the inner peripheral structure itself will tend to be low. Contains tasks to be done.

The present invention has been made to solve such conventional problems, and an object of the present invention is to obtain a stator core for an electric motor that can exclude leakage flux between magnetic poles and has excellent strength.

[Means for Solving the Problems] A stator core for an electric motor according to the present invention has ball pieces of a laminated structure formed completely independently in the circumferential direction by joining high-strength reinforcing plates made of non-magnetic material. The inner circumferential structure is connected to the outer circumferential structure and fits into the outer circumferential structure.

[Function] In this invention, the magnetic poles of the inner peripheral structure are magnetically discontinuous, and leakage magnetic flux no longer flows, and the reinforcing plate is stronger than the thin plate forming the ball piece. As a result, the strength of the inner peripheral structure to which the ball pieces are connected is excellent.

[Example] Figures 1 to 3 all show an example of the present invention. That is, the stator core of the electric motor of the illustrated example has a cylindrical outer circumferential elliptical structure 1 made of laminated thin plates such as electromagnetic steel sheets.
and an inner circumference structure 2 formed by laminating electromagnetic steel plates and the like which are fitted and fixed to the outer circumference H4Q1. The outer circumferential tank structure 1 is made by laminating a plurality of ring-shaped plates, and the inner circumferential structure 2 surrounds a plurality of square-shaped ball pieces 3 having a laminated structure constituting each magnetic pole. They are arranged with a predetermined gap S in each direction. Each ball piece 3 is arranged radially, and between two adjacent ball pieces 4, a slot 4 for installing a winding wire is formed between them in the axial direction, and a slot 4 is formed between them in the axial direction, and a slit is formed on the inner periphery side by the above-mentioned gap S. are formed one by one. Although the pole pieces 3 are independent from each other, they are connected by reinforcing plates 5 at their axial side end faces.

Is the reinforcing plate 5 a non-magnetic material and an oval material for the ball piece 3? Higher strength D: 1. Made of a stainless steel plate, for example, the inner circumferential side is connected by a bridge-like connecting part 6, and the outer circumferential side is an overlapping part that matches the shape of the ball piece 3 and overlaps with the end face of each ball piece 3. It has a configuration in which the number 7 protrudes radially. This reinforcing plate 5 is bonded and fixed to at least one side end surface of the ball piece 3, making each ball piece 3 a series. 1 shows an example in which the reinforcing plate 5 is bonded and fixed to both end surfaces of the ball piece 3, and FIG. 3 shows an example in which the reinforcing plate 5 is bonded and fixed to one side end surface of the ball piece 3. are shown respectively.

In the stator core of the embodiment having the above structure, the ball pieces 3 of the inner circumferential horizontal structure 2 are independent from each other with a slit formed by a gap S, and are interconnected only by the reinforcing plate 5. Each ball piece 3 constitutes a magnetic pole, but the flow of leakage magnetic flux to adjacent magnetic poles is controlled by each ball piece 3 being independent with a gap S between them, and the connecting reinforcing plate 5 Since it is a non-magnetic material, it is blocked. Therefore, there is almost no reduction in efficiency due to leakage magnetic flux, and the efficiency and the strength of the inner circumferential structure 2 are improved.

[Effects of the Invention] As is clear from the above description of the embodiments, the stator core of the electric motor of the present invention has a cylindrical outer peripheral structure made of laminated thin plates, and a structure that fits into the outer peripheral structure. It consists of an inner peripheral structure in which a plurality of fixed ball pieces having a laminated structure constituting magnetic poles are arranged at predetermined intervals in the circumferential direction, and the inner peripheral structure has at least one end surface that is
Because it is connected in a bridge shape on the inner periphery side and is reinforced on the outer periphery side by joining a high-strength reinforcing plate made of a non-magnetic book with a radially protruding overlapping part that overlaps the end face of each ball piece, There is magnetic discontinuity between each magnetic pole in the inner circumferential structure, and leakage magnetic flux no longer flows, and the reinforcing plate is stronger than the thin plate that makes up the ball piece, so this makes it easier to maintain the connection between the ball pieces. The strength of the surrounding structure is excellent.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the inner circumference structure of a stator core according to an embodiment of the present invention, FIG. 2 is a perspective view showing the outer circumferential side passage, and FIG. FIG. 3 is a perspective view showing an inner peripheral portion ellipse. In the figure, 1 is the outer peripheral structure, 2
3 is an inner peripheral structure, 3 is a ball piece, 4 is a slot, 5 is a reinforcing plate, 6 is a connecting portion, 7 is an overlapping portion, and S is a gap. Note that the same reference numerals in the figures indicate the same or equivalent parts. Representatives Masu Oiwa and Okuike (2 people) Figure 1

Claims (1)

[Claims] A cylindrical outer peripheral structure made of laminated thin plates, and a plurality of ball pieces of the laminated structure forming magnetic poles that are fitted and fixed to this outer peripheral structure and arranged at predetermined intervals in the circumferential direction. The inner circumferential structure is a non-magnetic material whose at least one end surface is connected in a bridge shape on the inner circumferential side, and has a radially protruding overlapping portion on the outer circumferential side that overlaps with the end surface of each ball piece. A stator core for an electric motor, characterized in that it is reinforced by joining high-strength reinforcing plates made of: