Motor and method for adjusting the performance of a motor

Abstract

This invention provides a motor and a motor adjustment method that can prevent increased iron loss and material damage during the stamping process of the rotor core. [Solution] The motor 1 comprises a stator core 2, which is a stator; a rotor core 3, which is a rotor; a shaft 4 that rotates together with the rotor core 3; a bearing 5 that holds the shaft 4; a bracket 6 that supports various components; and a cover 7 that houses the various components. The rotor core 3 has multiple slots arranged radially and for housing dielectrics such as permanent magnets, which are made by punching. Each slot is closed on the outer diameter side by a bridge portion, and an arc is provided in the center of the bridge portion that is recessed from the outer diameter side to the inner diameter side.

Description

Technical Field

[0001] The present invention relates to a motor and a method for adjusting performance of a motor. Background Art

[0002] Conventionally, there has been known a motor capable of adjusting the output of the motor, in which an outer diameter side of a slot that accommodates an inductive body such as a magnet provided on a rotor core of the motor is closed by a bridge portion, and a slit recessed from an outer diameter portion of the bridge portion toward an inner diameter is provided. Patent Document 1 describes a configuration in which the power factor of the motor is improved by providing a substantially rectangular slit. Prior Art Literature Patent Literature

[0003] Patent Document 1 Japanese Unexamined Patent Publication No. 9-224358 Summary of Invention Problem to be Solved by Invention

[0004] However, in the rotor core of the above-mentioned conventional motor, since the slit provided in the outer diameter portion of the bridge portion is substantially rectangular, there have been problems that stress concentrates at corner portions of the slit, and the entire punching perimeter becomes longer, which increases the pressure applied to the member. Therefore, when manufacturing the rotor core of the above-mentioned conventional motor, there has been a problem that an increase in iron loss and chipping are likely to occur.

[0005] Accordingly, an object of the present invention is to provide a motor and a method for adjusting performance of a motor that can prevent an increase in iron loss and chipping of a member when punching a rotor core. Means for Solving Problem

[0006] To achieve the above objective, the invention described in claim 1 is a motor having a rotor core in which a plurality of slots are arranged radially, wherein the rotor core is provided with a plurality of bridge portions that close the outer diameter side of each slot, and each bridge portion is provided with an arc that is recessed from the outer diameter side to the inner diameter side. Furthermore, the invention described in claim 2 is a method for adjusting the performance of a motor having a rotor core in which a plurality of slots are arranged radially, characterized in that a plurality of bridge portions are provided on the rotor core to close the outer diameter side of each slot, and an arc is provided on each bridge portion that is recessed from the outer diameter side to the inner diameter side, and the stall torque and maximum output are increased or decreased by changing the radius of the arc while keeping the radial distance between each slot and the center of the arc provided on each bridge portion constant. [Effects of the Invention]

[0007] According to the inventions described in claims 1 and 2, the rotor core is provided with a bridge portion that closes the outer diameter side of each slot, and the bridge portion is provided with an arc that is recessed from the outer diameter side to the inner diameter side. Therefore, the radial width of the bridge section is narrowed by the arc, improving the motor's power factor. In addition, since the total circumference required for punching is reduced compared to a rectangular shape, punching efficiency is improved when creating the arc by punching, preventing increased iron loss and material damage.

[0008] According to the invention described in claim 2, the stopping torque and maximum output of the motor are increased or decreased and adjusted by changing the radius of the arc of the bridge portion while keeping the radial width from the center of the arc of the bridge portion to the slot constant. Therefore, in addition to the above effects, it is possible to easily adjust the stall torque and maximum output by simply changing the radius of the arc, without requiring a separate control unit that adjusts the stall torque and maximum output by adjusting the current supplied to the motor. Furthermore, since the stall torque and maximum output can be easily adjusted to match the configuration of existing gears, there is no need to provide separate parts such as gears that match the stall torque. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view showing the motor of the present invention. [Figure 2] This is a diagram showing the rotor core. [Figure 3] This is an enlarged view of section A in Figure 2. [Figure 4] Figure 3 is an explanatory diagram showing the state when the radius of the arc is changed. [Figure 5] This graph shows the relationship between the radius of the arc and the stall torque of the motor. [Figure 6] This graph shows the relationship between the radius of the arc and the maximum output of the motor. [Modes for carrying out the invention]

[0010] Hereinafter, an example of a motor 1 according to an embodiment of the present invention and a method for adjusting the performance of motor 1 will be described with reference to the drawings. Figure 1 is a cross-sectional view showing the motor 1 of the present invention. Figure 2 is a diagram showing the rotor core 3. Figure 3 is an enlarged view of part A in Figure 2. Figure 4 is an explanatory diagram showing the state in Figure 3 where the radius R of the arc 23 is changed. Figure 5 is a graph showing the relationship between the radius R of the arc 23 and the stall torque of the motor 1. Figure 6 is a graph showing the relationship between the radius R of the arc 23 and the maximum output of the motor 1.

[0011] (Motor configuration) The configuration of motor 1 will now be described. Motor 1 is an induction motor, and as shown in Figure 1, it has a stator core 2 which is a stator, a rotor core 3 which is a rotor rotatably supported by the stator core 2, a shaft 4 which is held by the rotor core 3 and rotates together with the rotor core 3, a bearing 5 which holds the shaft 4, a bracket 6 which supports various components, and a cover 7 which houses the various components. The stator core 2 is composed of an inner core 8 and an outer core 9, and a coil 11 wound on a bobbin 10 is attached to it.

[0012] The rotor core 3 is a component used in the motor 1 as a rotor, and is formed by laminating electromagnetic steel sheets. As shown in Figure 2, the rotor core 3 has a plurality of slots 21, 21... arranged radially and housing dielectrics 20 such as permanent magnets, which are provided by punching.

[0013] As shown in Figure 3, each slot 21 in which the derivative 20 is housed is closed on its outer diameter side by a bridge portion 22. An arc 23 that is recessed from the outer diameter side to the inner diameter side is provided in the center of each bridge portion 22 by punching. The provision of the arc 23 in each bridge portion 22 narrows the width H, which is the radial distance from the center of the arc 23 to the slot 21. The width H is a predetermined distance, which in this embodiment is 0.3 mm.

[0014] According to the motor 1 described above, the rotor core 3 is provided with a bridge portion 22 that closes the outer diameter side of each slot 21, and a circular arc 23 that is recessed from the outer diameter side to the inner diameter side is provided at the center of the bridge portion 22. Therefore, the radial width H of the bridge portion 22 is narrowed by the circular arc 23, and the power factor of the motor 1 is improved. In addition, since the total circumference length for punching the circular arc 23 is reduced compared to a rectangular shape, punching efficiency is improved when creating the circular arc 23 by punching, and it is possible to prevent increased iron loss and material damage.

[0015] (Method for adjusting motor performance) This section explains how to adjust the performance of motor 1 by changing the radius R of arc 23. In each bridge portion 22, as shown in Figures 4(a) to 4(c), the performance of the motor 1 is adjusted by varying the radius R of the arc 13 of the bridge portion 22 while keeping the width H of the thinnest portion constant (0.3 mm in the present embodiment). In Figure 4, (a) shows the case where the radius R is 0.1 mm, (b) shows the case where the radius R is 0.5 mm, and (c) shows the case where the radius R is 1.0 mm. Specifically, as shown in the graphs of Figures 5 and 6, the radius R and the stall torque and maximum output of the motor 1 have a proportional relationship: reducing the radius R of the arc 23 decreases the stall torque and maximum output, while increasing the radius R of the arc 23 increases the stall torque and maximum output. In this manner, changing the radius R of the arc 23 increases or decreases the stall torque and maximum output of the motor 1.

[0016] According to the motor performance adjustment method described above, in the bridge portion 22 that closes the outer diameter side of each slot 21, the stall torque and maximum output of the motor 1 are adjusted by increasing or decreasing them through changing the radius R of the arc 23 provided in the bridge portion 22 while keeping constant the radial width H from the center of the arc 23 to the corresponding slot 21.

[0017] Therefore, the stall torque and maximum output can be easily adjusted only by processing of changing the radius R of the arc 23, without requiring a separate component such as a control unit that adjusts the stall torque and maximum output by adjusting the current value supplied to the motor 1. Furthermore, since the stall torque and maximum output can be easily adjusted in accordance with the configuration of existing gears and the like, there is no need to provide separate components such as gears adapted to the stall torque.

[0018] It should be noted that the motor and the motor performance adjustment method according to the present invention are not limited in any way to the aspects of the above embodiment, and appropriate changes can be made as necessary not only to the overall configuration of the motor and the motor performance adjustment method but also to various configurations and the like. Description of Reference Numerals

[0019] 1. Motor, 2. Stator core, 3. Rotor core, 4. Shaft, 5. Bearing, 6. Bracket, 7. Cover, 8. Inner core, 9. Outer core, 10. Bobbin, 11. Coil, 20. Inductor, 21. Slot, 22. Bridge section, 23. Arc.

Claims

1. It has a rotor core in which multiple slots are arranged along the radial direction, The rotor core is provided with a plurality of bridge portions that close the outer diameter side of each slot. A motor characterized in that each of the aforementioned bridge sections is provided with an arc that is recessed from the outer diameter side to the inner diameter side.

2. In a motor having a rotor core in which multiple slots are arranged radially, The rotor core is provided with a plurality of bridge portions that close the outer diameter side of each of the slots, Each of the aforementioned bridge sections is provided with an arc that is recessed from the outer diameter side to the inner diameter side, A method for adjusting the performance of a motor, which involves increasing or decreasing the stall torque and maximum output by changing the radius of the arc while keeping the radial distance between each slot and the center of the arc provided in each bridge section constant.

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