WO1999008364A1

WO1999008364A1 - Capacitor motor

Info

Publication number: WO1999008364A1
Application number: PCT/JP1997/004262
Authority: WO
Inventors: Hiroaki Nishiyama; Haruo Nakatsuka; Etsuo Nakazawa
Original assignee: Shibaura Engineering Works Co., Ltd.
Priority date: 1997-08-11
Filing date: 1997-11-21
Publication date: 1999-02-18
Also published as: JP4026731B2; CN1173447C; CN1233357A; KR100485251B1; JPH11122849A; KR20000064273A

Abstract

Large slots (16) are provided at the four corner sections of a stator core (10) and small slots (16) are provided at the other positions, and then, the width of a core back (12) is made equal over the total periphery of the back (12). Therefore, the magnetic path design of the stator core can be rationalized and the stator core becomes economical.

Description

Light

TECHNICAL FIELD The present invention relates to an induction motor, particularly to a capacitor motor. BACKGROUND ART A capacitor motor is a single-phase induction motor having a main winding and an auxiliary winding, and using a capacitor connected in series to the auxiliary winding.

In this capacitor motor, it is known that the stator core 110 has a square shape, and the slots 116 are equally arranged as shown in FIG. In FIG. 5, the main winding 120 is indicated by a solid line, and the auxiliary winding 122 is indicated by a dotted line. The numbers in parentheses in (1) to (8) mean the slot numbers indicating the positions of the slots.

However, in the square stay core 110 having the configuration of the equally-distributed slots 116 shown in FIG. There was a problem that the magnetic path at the two corners was not used effectively and was uneconomical.

Further, when the square stay core 110 is used, there is a problem that the dimension L5 of the side of the outer peripheral portion becomes large.

Accordingly, the present invention has been made in view of the above problems, and provides a capacitor motor having a cost-effective core that can optimize the magnetic path design.

DISCLOSURE OF THE INVENTION The capacitor motor according to claim 1 of the present invention has a main winding and an auxiliary winding having a turn ratio of approximately 1 to 1, and has a stator core having a rounded outer peripheral shape. In a four-pole condenser summer where the number of slots of the stator core is 24, the slots located at the four corners of the core are replaced with other parts. The width of the core back of the above-mentioned core is made substantially uniform over the entire circumference by being formed larger than the slot located at o.

The capacitor motor according to claim 2 is the capacitor motor according to claim 1, wherein a bottom of the slot located at a position other than the four corners of the stay core is substantially parallel to an outer peripheral surface of the stay core. It was formed.

The capacitor motor according to claim 3 is the capacitor motor according to claim 1, wherein two windings of different phases are stored in slots located at four corners of the stay core, respectively. Cores located outside the four corners of the core A single winding is stored in a lot.

The capacitor motor according to claim 4 is the motor according to claim 1, wherein a spatial phase angle of the main winding and the auxiliary winding is 120. It is configured as follows.

According to the capacitor motor of claim 1, by making the width of the core knock of the stator core substantially uniform over the entire circumference, the magnetic resistance is made uniform, and the magnetic resistance and the core material are made uniform. Can be reduced. Also, by increasing the size of the slot (hereinafter referred to as the large slot) located at the corner of the stay core, it is possible to increase the winding resistance without increasing the magnetic resistance. The delivery space can be expanded.

According to the capacitor motor of claim 2, the bottom of a slot (hereinafter, referred to as a small slot) located outside the corner of the stay core is connected to the outer peripheral surface of the stay core. By forming them approximately parallel, the width of the core back can be made almost completely uniform over the entire circumference, so that the magnetic resistance can be made uniform and the magnetic resistance and the core material can be reduced. It can be.

According to the capacitor motor of the third aspect, coil winding is stored by storing two windings of different phases only in the large slot and storing only one winding in the small slot. This facilitates the spatial storage arrangement of the coils and, as a result, the size of the stay core can be reduced. Therefore, it is possible to reduce the winding resistance and the winding material. By arranging and equalizing the spatial arrangement of the main winding and the auxiliary winding with respect to the stay core in a symmetrical position, the characteristics during both forward and reverse rotation can be made substantially uniform. By performing such a winding arrangement, the spatial phase angle between the main winding and the auxiliary winding is set to 120 ° can be formed. As a result, the starting torque is improved.

In the capacitor motor according to claim 4, the spatial phase angle between the main winding and the auxiliary winding is 120. With this configuration, the startup torque can be improved. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view of a stay core in a capacitor motor showing one embodiment of the present invention.

FIG. 2 is a graph showing the characteristics of the capacitor motor of this embodiment.

FIG. 3 is a plan view of the teeth of the steel core of the second embodiment, and FIG. 4 is a plan view of the core back as well.

FIG. 5 is a plan view of a stator core of a conventional capacitor motor.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

This embodiment relates to a capacitor motor which is a type of induction motor. FIG. 1 is a plan view of a stay core 10 used in this capacitor motor. Although the rotor (rotor) used in this capacitor motor is not shown, a cage rotor is used as in the conventional case.

The structure of the stator core 10 in FIG. 1 will be described. The core 10 has a round and square shape and a substantially rectangular core back 1.

Twenty-four slots are formed by 24 teeth 14 projecting from the inner peripheral surface of 2 and the core knock 12. Teeth 14 stands for

T-shaped.

Next, the structures of the core back 12 and the slot 16 will be described in detail.

First, the core back 12 has a rounded square shape as described above, that is, the plane shape is a square, and the four outer corners are notched obliquely. It has an octagonal shape. The four corners are provided with bolt holes 18 for fixing the laminated plates of the stator core 10 to be laminated. The width M of the core 12 is substantially uniform over the entire circumference of the core 10 as shown in FIG. This uniformity is due to the following two reasons.

The first reason is that the size of the large slots 16 located at the four corners of the core 10 is greater than the size of the small slots 16 located elsewhere. This is because it is formed large. For example, the large slots 16 (1), (2), (7), and (8) in Fig. 1 are the small slots 16 (3), (4), (5), (6) It is formed larger than that. (1)-(8) The number in parentheses indicates the slot number indicating the position of the slot. The second reason is that the bottom of the small slot 16 is formed substantially parallel to the outer periphery of the core knock 12.

Next, a case where main winding 20 and auxiliary winding 22 are attached to stator core 10 will be described.

First, the outline of the installation will be described.

Only the large slot 16 accommodates two windings out of phase, and the small slot 16 accommodates only one winding. In FIG. 1, the main winding 20 is indicated by a solid line, and the auxiliary winding 22 is indicated by a dotted line.

Specifically, the main winding 20 is housed in the large slot 16 (1) and the small slot 16 (6), and the large slot 16 (2) and the small slot The main winding 20 is stored in 16 (5). The auxiliary winding 22 is accommodated in the small slot 16 (3) and the large slot 16 (8), and the small slot 16 (4) and the large slot Auxiliary winding 22 is housed between 16 and (7). Other slots without the slot numbers (1) to (8) also house the main winding 20 and the auxiliary winding 22 in the same manner.

The turns ratio between the main winding 20 and the auxiliary winding 22 is set to approximately 1: 1.

The capacitor motor formed by the stationary core 10 configured as described above has four poles, and has the following effects.

Since the outer shape of core 10 is rounded,

—Even The yield of core 10 material removal can be improved. Since the width M of the core back 12 is formed to be substantially equal over the entire circumference, the magnetic resistance can be made uniform, and the magnetic resistance and the stay core material can be reduced.

Since the large slots 16 located at the four corners of the stator core 10 are formed larger than the small slots located at other positions, the magnetic resistance does not increase. In addition, the storage space for the main winding 20 and the auxiliary winding 22 can be expanded.

By storing two windings of different phases only in the large slot 16 and only one winding in the small slot 16, the spatial arrangement of the coil end can be reduced. Easily, and as a result, the overall size of the core can be reduced. Therefore, it is possible to reduce the winding resistance and the winding material.

The spatial arrangement of the main winding 20 and the auxiliary winding 22 with respect to the stator core 10 is equalized, that is, by symmetrically arranging, the characteristics during both forward and reverse rotations can be equalized. it can. In particular, since the winding ratio between the main winding 20 and the auxiliary winding 22 is approximately 1: 1, the same characteristics can be obtained for both forward and reverse rotations.

By adopting the winding arrangement as described above, the spatial phase angle between the main winding 20 and the auxiliary winding can be made 120 °, and the starting torque can be improved. Can be done.

The outer shape of the stator core 10 is L5 as shown in FIG. 5 in the conventional stay core, but is L1 in the present embodiment. And 1 / S5 is about 85%. Also, stay overnight The amount of core material can be reduced by 73% compared to the conventional one, and the amount of winding can be reduced to 80%.

In the above embodiment, four holes 18 are provided for fixing bolts. However, if the holes 18 are not provided, the size of the large slot 16 must be further increased. As a result, the length of the core 10 can be reduced, and the main length of the coil can be shortened.

Fig. 2 is a graph comparing the characteristics of a capacitor motor using a stationary core 10 with the above configuration and a conventional capacitor motor.

In this graph, the horizontal axis indicates the rotation speed (rpm), the left vertical axis indicates the torque (Nm), and the right vertical axis indicates the loss (W) relative to the condenser heat. I have. Each line in the graph has the following meaning. Thick two-dot chain line: 50 Hz torque of the capacitor motor of the present application Thick dotted line: 60 Hz torque of the capacitor motor of the present application Thick solid line: 50 Hz of the capacitor motor of the present application Thick dashed line: 60 Hz loss of the capacitor motor of the present application Thin two-dot chain line: 50 Hz torque of the conventional capacitor motor Thin dotted line: 60 Hz of the conventional capacitor motor Torque thin solid line: 50 Hz loss of conventional capacitor motor Thin dashed line: 60 Hz loss of conventional capacitor motor In this graph, the Tonorek characteristics of 50 Hz are explained. Focusing on the start-up (rotation speed = 0 rpm), the capacitor motor of this embodiment has a capacity of 1.57 N * m, and the conventional capacitor motor has a capacity of 1.3 N * m. It is. This means that in the case of the condenser of the present embodiment, a larger torque can be obtained from startup than in the conventional condenser motor.

On the other hand, the characteristics of the loss at 50 Hz will be described.

At start-up, if the capacitor motor of the present embodiment has a loss of about 700 W, the conventional capacitor motor has a loss of about 840 W. That is, when the torque is considered, the loss of the capacitor motor of the present embodiment is smaller than that of the conventional capacitor motor.

As a method of using the capacitor motor of this embodiment, a motor of a home washing machine is preferable. Normally, a washing machine requires a large torque at the time of start-up, and the start-stop of the forward / reverse rotation is troublesomely repeated, and the same torque is required at the forward and reverse rotations. Energy saving can be achieved by using an asymmetric winding like a capacitor motor.

FIGS. 3 and 4 are plan views of the step core 10 of the second embodiment.

The difference between the stator core 10 of the present embodiment and the stator core 10 of the first embodiment is that the core 10 is divided into a core back 12 and a connected tooth 14. By integrating them, the status core 10 is completed.

In the case of this embodiment, the main winding 20 and the auxiliary winding 22 are Before attaching the tooth 14 to the core 12 and the lock 12, the slot 16 formed between the teeth 14 needs to be stored from the outside with a force <, according to the first embodiment. It is different.

Since the completed stay core has the same shape as the stay core 10 of the first embodiment, the same effects as those of the first embodiment can be obtained. INDUSTRIAL APPLICABILITY According to the capacitor motor of the present invention, by forming a large slot and a small slot for an asymmetric winding in the stator core of the capacitor motor, By making the resistance uniform, the magnetic resistance, the material of the stator core and the steel wire material can be reduced, and the space for storing the windings can be expanded without increasing the magnetic resistance.

Claims

The scope of the claims

It has a main winding and an auxiliary winding with a turn ratio of approximately 1 to 1,

A four-pole capacitor motor having a stator core having a round and square outer peripheral shape, wherein the stator core has 24 slots.

The slots located at the four corners of the stay core are formed larger than the slots located at other locations, and the width of the core back cover of the stay core is extended over the entire circumference. Almost uniform

This is a feature of Condensamo overnight. The bottom of the slot located outside the four corners of the stay core was formed substantially parallel to the outer peripheral surface of the stay core.

2. The capacitor motor according to claim 1, wherein: The two windings of different phases were stored in the slots located at the four corners of the station.

One winding was housed in a slot other than the four corners of the core.

3. The condensed mosquito as claimed in claim 1, characterized in that: The spatial phase angle between the main winding and the auxiliary winding is 120. The capacitor motor according to claim 1, wherein the capacitor motor is configured as follows.