JPS61128740A - Motor - Google Patents

Abstract

PURPOSE:To suppress the temperature rise of windings, by providing salient sections through one at least or more of the bottom or side sections of slots into the slots. CONSTITUTION:A core 2 is provided in the peripheral direction of the shaft of a rotor 1, and slots 4 contains windings 3 are provided inside the core 2. And the windings 3 are contained in the slots via insulating substance 5. And salient sections 8 are provided through slot bottom sections into the slots, and the windings 3 are pushed to the sides of slot opening sections 4a. In this manner, the surface area of the core 2 in the slots 4 for cooling air passage is enlarged, and the temperature rise of the core 2 can be suppressed. And leakage flux is reduced, and high rotating magnetic field is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to electric motors used as power sources for household, business, and industrial equipment.

2. Description of the Related Art Conventional electric motors of this type have structures as shown in FIGS. 3 and 4, for example.

That is, an iron core 2 is provided in the axial circumferential direction of the rotor 1, a slot 4 for storing the winding 3 is provided inside this iron core 2, the winding 3 is stored in this slot 4 via an insulator 6, and the above-mentioned iron core 2
A first bracket 6 and a second bracket 7 are arranged so as to face each other, and the rotation of the rotor 1 is received by the bracket 6 and the second bracket 7.

Problems to be Solved by the Invention However, with such a structure, the temperature of the winding 3 becomes significantly high under high loads.

Also, when performing ventilation cooling, since the space factor of the winding 3 is high, the cold air flows as shown by the arrow in Figure 4, but hardly flows inside the slot 4, which ultimately suppresses the temperature rise of the winding 3. There was a problem in that the electric motor could not be used under high load conditions.

Further, as shown in FIG. S, in the case where the space factor of the winding 3 is lowered, the air gap is large, so cold air passes through the slot, and the winding temperature does not rise. However, the magnetic field generated by the winding 3 is difficult to be transmitted to the iron core 3 due to the large air gap between the winding 3 and the iron core 2 or between the windings 3. Therefore, there is a problem in that the rotating magnetic field is lower than that of a motor with a high space factor, resulting in poor motor efficiency.

Therefore, the present invention provides that even when the motor is under high load, the winding 3
The temperature rise in the motor is suppressed as much as possible, and the motor can be driven without reducing the efficiency of the motor.

Means for Solving the Problems In order to solve the above problems, the present invention provides at least one protrusion from the bottom or side of the slot toward the inside of the slot, and the protrusion is inserted into the slot through an insulator. The bundled windings are pushed toward the slot opening side.

Effect of the Invention The present invention uses the above-mentioned means, since the space factor of the winding is low, there are many cavities, and the surface area inside the slot is wide, so that cold air can easily pass through the slot, and the core temperature inside the slot can be reduced. As a result, the temperature rise in the winding can be suppressed as much as possible. Further, since the protrusion pushes the winding toward the slot opening side, the air gap between the winding and the slot is comparable to that of a winding with a high space factor, and a high rotating magnetic field can be obtained. As a result, even under high load conditions, the temperature rise in the windings can be suppressed to a low level, and the motor can be driven without reducing motor efficiency.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. Components that are the same as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted here. In Fig. 1, 8 is a protrusion;
It is provided toward the inside of the slot from the bottom of the slot, and the winding 3 is pushed toward the slot opening 4a side.

In the above configuration, since the space factor of the winding 3 is low, when performing ventilation cooling, the cold air passes through the slot 4 and the winding 3
Keep the temperature rise low. In addition, by providing the protrusion 8 in the slot 4, the slot 4, which is a ventilation path for cold air, is
The surface area of the iron core 2 inside is also increased, and the temperature rise of the iron core 2 can also be suppressed. In addition, since the protrusion 8 pushes the winding @3 toward the slot opening 4a, the air gap between the winding 3 and the slot 4 is the same as that of a conventional electric motor with a high space factor. Magnetic flux is reduced and a high rotating magnetic field is obtained. However, since only an insulator is interposed between the protrusion 8 and the winding 3, the air gap is small and magnetic flux can easily pass through. However, the magnetic flux generated from the winding 3 comes out as shown by the arrow in the figure and tries to pass through the iron core 3, which has low magnetic resistance, and does not try to pass through the protrusion 8, so it has no effect on the characteristics. Not affected. Therefore, the motor efficiency can be increased to the same level as a motor with a high space factor.

Next, other embodiments of the present invention will be described.

FIG. 2 shows another embodiment, in which a protrusion 8' is provided from the side of the slot 4 into the slot 4. In this case, as in the above embodiment, the cold air passes through the slots 4, suppressing the temperature rise of the winding 3 and the iron core 2, and suppressing the magnetic flux generated from the winding 3. A magnetic flux similar to that of an electric motor can be obtained, and as a result, similar electric characteristics can be obtained.

Note that the protrusion 8 does not have to be integrated with the iron core 2. In short, it is sufficient as long as it pushes the winding 3 toward the slot opening 4a side, does not affect the rotating magnetic field due to the magnetic flux generated from the winding 3, and suppresses the rise in temperature of the winding 3 and the iron core 2.

Effects of the Invention As is clear from the embodiments described above, the electric motor of the present invention has at least one protrusion extending from the bottom or side of the slot into the slot, and the protrusion is bound together via an insulator. By pushing the windings toward the slot opening, cold air passes through the slots, suppressing the temperature rise of the windings and core, and also reducing the magnetic flux generated from the windings, which is lower than the conventional space factor. It is possible to obtain something similar to a motor with high efficiency, high efficiency, and low temperature rise in the winding and iron core even under high load conditions.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a cross-sectional view showing an iron core of an embodiment of the present invention;
The figure is a cross-sectional view showing a part of the iron core of another embodiment of the present invention.
Fig. 3 is a vertical cross-sectional view of a conventional electric motor, Fig. 4 is a cross-sectional view showing a part of the conventional iron core, and Fig. 5 is a cross-sectional view showing a part of the iron core of another conventional row. It is. 2--Iron core, 3...Winding, 4--Slot, 5
-...Insulator, 8...Protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 2---Ittetsu Ic:

Claims (1)

[Claims] A rotor, an iron core, and a winding are provided, a slot for storing the winding is provided inside the iron core, a protrusion is provided from at least one slot bottom or side toward the inside of the slot, and the protrusion is An electric motor in which windings bound together with an insulator are pushed toward the slot opening.