JPS6192134A - Motor - Google Patents

Abstract

PURPOSE:To maintain the securing strength of inner and outer stator cores constant irrespective of press-fitting direction by skewing the inner core. CONSTITUTION:A inner stator core 11 is formed by skewing inner stator core sheets 9 punched from electromagnetic steel plates with approx. 1-1.3 slot pitch, and laminating fixedly the sheets. Then, the inner periphery of outer core sheet 10 is engaged with the outer periphery of the core 11. Thus, the press-fitting strength of the inner and outer cores in the press-fitting direction less decreases to reduce a noise and a magnetic resistance between the both bores, and the magnetic cogging between a rotor and a stator can be reduced by the skew.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to electric motors used in industrial equipment, office equipment, home appliances, and the like.

Conventional configurations and their problems In recent years, with the spread of industrial equipment, office equipment, and home appliances, electric motors have been used more and more. Motors that have slot openings on their sides to facilitate the insertion and placement of stator windings have come into widespread use because they are easy to manufacture.

A conventional electric motor will be explained below. FIG. 1 is the 1υth 10th diagram of a conventional electric motor. 1 is a stator outer core, and 2 is a stator inner core whose inner periphery is connected and has a slot opening on its outer periphery, which is press-fitted into the inner periphery of the stator outer core to form the stator core. .

3 is a field magnet, and 4 is a rotor core. 5 is a conductor housed inside the slot, 6 is one tooth of the stator inner core 2, 7 it [iζ・1 is a slot opening of the stator inner core 2, and 8 is a connecting part of the inner circumference of the stator inner core. be. FIG. 2 is an external perspective view of the core sheet and the stator inner core. The stator inner iron 9 is punched from an electromagnetic steel plate, and the core sheet 9 is laminated and fixed with the slot openings 7 aligned, and the outer diameter is ψ.
D is the outer core sheet 10 by polishing, cutting, etc.
The inner periphery of the stator inner core 2 is fitted onto the outer periphery of the stator inner core 2, and the outer core core sheet 10 is finished in a size that can be fixed thereto.

After winding and attaching the glands to the stator inner core 2, the stator outer core core sheath 1-10 is press-fitted and fixed to the inner core 2.
.

However, in the above configuration, when the outer iron +l, 710 and the inner iron core 2 are press-fitted together, the inner surface of the outer iron core 10 is the inner iron core 2.
is press-fitted while being in pressure contact with the outer surface of the toothed portion 6. Since the slot openings 7 of the inner core 2 are aligned and stacked, the teeth 6 of the inner core 2 are press-fitted only to a specific portion of the outer core 10 during the press-fitting process.

Therefore, as press-fitting progresses, the portion of the outer core 1° that is in contact with the teeth 6 of the inner core 2 wears out.

In particular, since the press-fitting start end of the outer core 10 is pressed over the entire area of the second inner core, wear increases.

For this reason, the press-fit fixing strength is weakened in areas where wear is large, causing problems such as generation of noise and increased magnetic resistance.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide an electric motor with low noise and core magnetic resistance, and which can rotate stably and smoothly even at low speeds.

Structure of the Invention The present invention provides a stator inner core constructed by stacking core sheets with a skew and a shape in which the inner circumferential sides are connected and the outer circumferential sides have slot openings. This electric motor has a stator with a structure in which a ring-shaped outer stator core formed in a shape that fits with the outer part of the inner stator core is press-fitted. , the adhesion strength of the stator inner core and stator outer core becomes constant regardless of the press-fitting direction, reducing noise and magnetic resistance between the cores, and reducing magnetic cogging, which is induced in the stator windings. Since the electromotive force waveform generated approaches a sine wave, it is excellent in that stable and smooth operation can be achieved even at low speeds.Explanation of an embodiment Fig. 3 shows the fixation of the motor in an embodiment of the present invention. It is an external perspective view of a child core sheet and a stator inner core.In FIG. 3, a stator inner core sheet 9 and a stator outer core sheet 1o are the same as those in FIG. 2.Stator inner core 1
1 is a stator core core sheet 9 punched from an electromagnetic steel sheet.
are stacked and fixed with a skew of about 1 to 1.3 slot pitch. 12 is a slot opening of the stator inner core, and 13 is a stator inner core tooth portion.

A stator is formed by winding the stator/inner core 11 having the above configuration and then laminating and fixing the stator outer core sheet 10, or by press-fitting the stator outer core sheet 1o in pieces. do.

According to this embodiment, by skewing the stator inner core by 1.0 to 1.3 slot pitches, when the outer core 1o is press-fitted when the stator outer core 1o is press-fitted, the inner circumference of the outer core is adjusted accordingly. Since the part of the inner core that is in contact with the teeth 6 of the outer core moves in the circumferential direction, the part of the inner circumference of the outer core that is shaved covers almost the entire inner circumference, reducing the amount of scraping and preventing the stator outer core from being press-fitted. It is possible to prevent a decrease in strength and reduce noise and magnetic resistance between cores. In addition, magnetic cogging is reduced, and the waveform of the voltage induced in the windings when the rotor rotates approaches a sine wave, so the ripple of the torque generated by the motor is reduced, making it stable and smooth even at low speeds of several rpm. rotation is possible.

In this embodiment, the skew amount of the stator inner core 2 is set to 1.
The slot pitch was 0 to 1.3, but ideally it would be 1.
0 is optimal. However, in reality, when the stator outer core is press-fitted into the stator inner core, the outer core tends to move in the circumferential direction along the skew of the inner core. ``The amount of movement varies slightly depending on the material of the electromagnetic steel sheet and the press-fitting margin between the inner periphery of the outer core and the outer periphery of the inner core, but it is 0 to 0.3 slot pitch. Therefore, the optimal cue amount of the stator inner core is about 1.0 to 1.3 in slot pinch. .

Effects of the Invention As is clear from the above explanation, the present invention skews the stator core to reduce dimensional changes due to scraping of the inner periphery of the outer core when press-fitting the stator inner core and the stator outer core. , it is possible to reduce the decrease in the press-fitting strength of the inner core and outer core in the forward direction, reduce the noise γS° and the magnetic resistance between the inner cores, and furthermore, it is possible to reduce the magnetic cogging of the rotor and stator. In addition, the waveform of the electromotive force induced in the stator winding due to the rotation of the rotor approaches a sine wave, so the ripple in the torque generated by the motor is small, resulting in stable and smooth operation even at low speeds. The present invention is intended to realize an excellent electric motor that can achieve the effect of enabling.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional electric motor, FIG. 2 is an exploded perspective view of the main parts thereof, and FIG. 3 is an exploded perspective view of the main parts of the electric motor according to an embodiment of the present invention. 1... Stator outer core, 9... Stator inner core core silt, 10... Stator outer core sheet, 11... Stator inner core. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 [ ;213

Claims (1)

[Claims] It has a stator inner core made by stacking a plurality of skewed core sheets whose inner circumferential sides are connected and which have slot openings on their outer circumferences, and a ring-shaped stator outer core press-fitted into the outer circumference of this stator core. Electric motor.