Rotor of rotating electrical machine

Abstract

To provide a rotor for a rotary electric machine that achieves both relaxation of stress concentration and weight reduction.SOLUTION: A rotor for a rotary electric machine is provided with: a first hole which is configured by a first side, a second side facing the first side, on a radially outside, and being shorter than the first side, and two third sides connecting the first side and the second side, and in which each of the first side and the second side crosses a d-axis; a bridge portion that connects the adjacent first holes together, and is located on a q-axis; a swaging portion located on a radially outer side of the bridge portion, on the q-axis; and a second hole which is configured by a fourth side located on a radially outer side of the swaging portion, an apex portion facing the fourth side, on a radially outside, and two fifth sides connecting the fourth side and the apex portion, and in which each of the fourth side and the apex portion crosses the q-axis.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rotor for a rotating electric machine. [Background technology]

[0002] As background art to the present invention, Patent Document 1 discloses a configuration in which, in order to alleviate stress concentration that occurs around holes (positioning holes) for determining position in the circumferential direction when stacking electromagnetic steel sheets, the positioning holes are arranged to fit within bridge portions formed by recessed holes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6165622 Summary of the Invention [Problem to be solved by the invention]

[0004] In light of Patent Document 1, in order to further improve the reliability of rotors in response to customer requests, the present invention aims to provide a rotor for a rotating electric machine that achieves both reduction in stress concentration and weight reduction. [Means for solving the problem]

[0005] The rotor of a rotating electric machine is composed of a first side, a second side that faces the first side radially outward and is shorter than the first side, and two third sides that connect the first side and the second side, and the first side and the second side each have a first hole that intersects the d axis, a bridge portion that connects adjacent first holes and is located on the q axis, a crimping portion that is located radially outward from the bridge portion on the q axis, a fourth side that is located radially outward from the crimping portion, an apex that faces the fourth side radially outward, and two fifth sides that connect the fourth side and the apex, and the fourth side and the apex each intersect the q axis. Effect of the Invention

[0006] According to the present invention, it is possible to provide a rotor for a rotating electrical machine which achieves both reduction in stress concentration and weight reduction. [Brief description of the drawings]

[0007] [Figure 1] Overall view of a hybrid electric vehicle [Diagram 2] Cross-sectional view of the rotating electric machine of FIG. [Diagram 3] 1 is a partial cross-sectional view of a rotor for a rotating electric machine according to an embodiment of the present invention; [Figure 4] Enlarged view of part of Fig. 3 [Diagram 5] Enlarged view of the second hole in Figure 3 [Figure 6] Magnet hole in Fig. 3

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The following description and drawings are examples for explaining the present invention, and appropriate omissions and simplifications have been made for clarity of explanation. The present invention can be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.

[0009] In order to facilitate understanding of the invention, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

[0010] (One embodiment) FIG. 1 is an overall view of a hybrid electric vehicle.

[0011] Vehicle 100 is equipped with engine 120, first rotating electric machine 200, second rotating electric machine 202, and battery 180. Battery 180 supplies DC power to rotating electric machines 200, 202 via power conversion device 600 when driving force from rotating electric machines 200, 202 is required, and receives DC power from rotating electric machines 200, 202 during regenerative running. DC power is exchanged between battery 180 and rotating electric machines 200, 202 via power conversion device 600.

[0012] Although not shown, the vehicle is equipped with a battery that supplies low-voltage power (for example, 14-volt power), and supplies DC power to a control circuit described below. Rotational torque from the engine 120 and the rotating electric machines 200, 202 is transmitted to the front wheels 110 via the transmission 130 and the differential gear 160. The transmission 130 is controlled by a transmission control device 134, and the engine 120 is controlled by an engine control device 124. The battery 180 is controlled by a battery control device 184. The transmission control device 134, the engine control device 124, the battery control device 184, the power conversion device 600, and the integrated control device 170 are connected by a communication line 174.

[0013] The integrated control device 170 is a higher-level control device than the transmission control device 134, the engine control device 124, the power conversion device 600, and the battery control device 184, and receives information indicating the respective states of the transmission control device 134, the engine control device 124, the power conversion device 600, and the battery control device 184 from them via a communication line 174. The integrated control device 170 calculates control commands for each control device based on the acquired information. The calculated control commands are transmitted to each control device via the communication line 174.

[0014] The high-voltage battery 180 is composed of a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery, and outputs high-voltage DC power of 250 to 600 volts or more. The battery control device 184 outputs the charge / discharge status of the battery 180 and the status of each unit cell battery that constitutes the battery 180 to the integrated control device 170 via the communication line 174.

[0015] When the integrated control device 170 determines that charging of the battery 180 is necessary based on information from the battery control device 184, it issues a power generation operation instruction to the power conversion device 600. Furthermore, the integrated control device 170 mainly manages the output torque of the engine 120 and the rotating electric machines 200, 202, and performs calculation processing of the total torque and the torque distribution ratio of the output torque of the engine 120 and the output torque of the rotating electric machines 200, 202, and transmits control commands based on the calculation processing results to the transmission control device 134, the engine control device 124, and the power conversion device 600.

[0016] The power conversion device 600 controls the rotating electric machines 200, 202 based on a torque command from the integrated control device 170 so as to generate a torque output or generated power as commanded. The power conversion device 600 is provided with power semiconductors that constitute an inverter for operating the rotating electric machines 200, 202. The power conversion device 600 controls the switching operation of the power semiconductors based on a command from the integrated control device 170. The switching operation of the power semiconductors causes the rotating electric machines 200, 202 to operate as electric motors or generators.

[0017] Fig. 2 is a cross-sectional view of the rotating electric machine of Fig. 1. In the following, the rotating electric machine 200 will be described as an example, but the rotating electric machine 202 also has a similar structure.

[0018] The rotating electric machine 200 includes a stator 3 and a rotor 4 inside a housing 1. The stator 3 has a stator core around which a coil 2 is wound, and the rotor 4 has a rotor core (rotor core) 10 formed by laminating a predetermined number of electromagnetic steel plates, a shaft 6, and a cover plate. The housing 1 fixes the shaft 6 via a bearing 7.

[0019] An air gap 5 is provided between the stator 3 and the rotor 4, and the rotor 4 is rotatably held. The rotor core 10 and the shaft 6 are press-fitted together.

[0020] Fig. 3 is a partial cross-sectional view of a rotor for a rotating electric machine according to an embodiment of the present invention, Fig. 4 is a partial enlarged view of Fig. 3, Fig. 5 is an enlarged view of a second hole of Fig. 3, and Fig. 6 is an enlarged view of a magnet hole of Fig. 3.

[0021] The rotor core 10 is formed with a magnet hole 10a, a first hole 11, a second hole 12, and a crimped portion 14. By inserting magnets (not shown) into the magnet holes 10a, the d-axis 15 is defined as an axis passing between the ends of the magnet holes 10a facing inward in the radial direction. The q-axis 16 is defined as an axis passing through a position facing the d-axis 15 in the radial direction with the magnet holes 10a in between. The magnet holes 10a are formed such that the end of the longitudinal end close to the d-axis 15 faces inward in the radial direction, and the end far from the d-axis 15 faces outward in the radial direction.

[0022] The first hole 11 has a substantially trapezoidal shape and is composed of a first side 11a, a second side 11b that faces the first side 11a on the radially outer side and is shorter than the first side 11a, and two third sides 11c that connect the first side 11a and the second side 11b. The first side 11a and the second side 11b each intersect with the d-axis 15. The first side 11a is curved toward the radially outer side.

[0023] The second hole 12 has a substantially triangular shape and is composed of a bridge portion 13 that connects adjacent first holes 11 and is located on the q axis 16, a crimped portion 14 that is located radially outward of the bridge portion 13 on the q axis 16, a fourth side 12a that is located radially outward of the crimped portion 14, an apex 12c that faces the fourth side 12a on the radially outer side, and two fifth sides 12b that connect the fourth side 12a and the apex 12c. The fourth side 12a and the apex 12c each intersect with the q axis 16. The fourth side 12a is curved radially inward.

[0024] The first holes 11 are recessed holes that prevent the rotor core 10 from being deformed by radially outward tensile stress that occurs when the rotor core 10 is press-fitted onto the shaft 6, and the gap portion relieves stress concentration. In this embodiment, the first holes 11 are trapezoidal in shape, but of the larger side (first side 11a) and smaller side (second side 11b) of the trapezoid, the smaller side is on the radially outer side.

[0025] The second holes 12 are positioning holes that position the rotor core layers that are stacked in the circumferential direction and also serve to relieve stress concentration. The first holes 11 and the second holes 12 each have a protruding shape that faces radially outward and a shape that curves radially inward.

[0026] Moreover, it is sufficient that the crimping portion 14 is formed on at least two of the outermost both surfaces where the electromagnetic hard plates of the rotor 4 are laminated, and it is not necessary to provide the crimping portion 14 on all of the electromagnetic hard plates. The crimping portion 14 is formed at a position on the outer diameter side of the first hole 11 (second side 11b) and on the q-axis 16, and on the inner diameter side of the second hole 12, thereby contributing to the alleviation of stress concentration.

[0027] In this way, on the premise that the rotor core 10 is not deformed or broken, the through holes each having a specific function are provided, and the positional relationship of each through hole is set to a position corresponding to the stress wave over 360°, thereby weakening the stress wave that reaches the magnet hole 10a when the shaft 6 is pressed into the rotor core 10, and alleviating the stress concentration that occurs in the magnet hole 10a of the rotor core 10. Furthermore, by setting the positional relationship of the through holes that alleviates the stress concentration on the rotor core 10 as shown in the embodiment of the present invention, the rigidity of the core of the rotor 10 is ensured, and each of the formed holes can be enlarged, thereby realizing a reduction in the weight of the rotor 4 including the rotor core 10. Furthermore, this weight reduction also enables the motor to rotate at a higher speed.

[0028] The above-described embodiment can also be applied to a pure electric vehicle that runs only on a rotating electric machine, and a hybrid electric vehicle that is driven by both an engine and a rotating electric machine.

[0029] According to the embodiment of the present invention described above, the following advantageous effects are obtained.

[0030] (1) The rotor 10 of the rotating electric machine is composed of a first side 11a, a second side 11b that faces the first side 11a on the radially outer side and is shorter than the first side 11a, and two third sides 11c that connect the first side 11a and the second side 11b. The rotor 10 is composed of a first hole 11a in which the first side 11a and the second side 11b each intersect with the d-axis 15, a bridge portion 13 that connects adjacent first holes 11 and is located on the q-axis 16, a crimped portion 14 that is located radially outward of the bridge portion 13 on the q-axis 16, a fourth side 12a that is located radially outward of the crimped portion 14, an apex 12c that faces the fourth side 12a on the radially outward side, and two fifth sides 12b that connect the fourth side 12a and the apex 12c, and a second hole 11b in which the fourth side 12a and the apex 12c each intersect with the q-axis 16. In this way, it is possible to provide a rotor 10 for a rotating electric machine that achieves both stress concentration relief and weight reduction.

[0031] (2) The first side 11a of the rotor 10 is curved radially outward, thereby making it possible to reduce stress concentration while ensuring rigidity.

[0032] (3) The crimped portion 14 of the rotor 10 is located radially outward of the second side 11b, thereby ensuring rigidity.

[0033] (4) The fourth side 12a of the rotor 10 is curved radially inward, thereby making it possible to reduce stress concentration while ensuring rigidity.

[0034] (5) Rotor 10 has magnet holes 10a into which magnets are inserted, and magnet holes 10a are formed such that the longitudinal ends closer to d-axis 15 face radially inward, and the longitudinal ends farther from d-axis 15 face radially outward. This makes it possible to reduce stress concentration while ensuring rigidity.

[0035] The present invention is not limited to the above-described embodiment, and various modifications and other configurations can be combined without departing from the spirit of the present invention. Furthermore, the present invention is not limited to those having all of the configurations described in the above-described embodiment, and includes those in which some of the configurations are omitted. [Explanation of symbols]

[0036] 10...Rotor (core) 10a…Magnet hole 11...1st hole 11a...First side 11b...Second side 11c…3rd side 12…Second hole 12a...4th side 12b...5th side 12c…top 13…Bridge section 14…Crimped part 15...d axis 16...q-axis

Claims

1. a first hole including a first side, a second side facing the first side on the radially outer side and shorter than the first side, and two third sides connecting the first side and the second side, the first side and the second side each intersecting with the d-axis; a bridge portion connecting adjacent first holes and located on the q-axis, a crimped portion located radially outward from the bridge portion on the q-axis, a fourth side located radially outward from the crimped portion, an apex facing the fourth side radially outward, and two fifth sides connecting the fourth side and the apex, and a second hole, wherein the fourth side and the apex each intersect with the q-axis. Rotor of a rotating electric machine.

2. 2. The rotor of the rotating electric machine according to claim 1, The first side is curved radially outward. Rotor of a rotating electric machine.

3. 2. The rotor of the rotating electric machine according to claim 1, The crimped portion is located radially outward from the second side. Rotor of a rotating electric machine.

4. 2. The rotor of the rotating electric machine according to claim 1, The fourth side is curved radially inward. Rotor of a rotating electric machine.

5. 2. The rotor of the rotating electric machine according to claim 1, A magnet hole into which a magnet is inserted is provided, The magnet hole is formed such that the end portion close to the d-axis among the longitudinal ends is directed radially inward, and the end portion farther from the d-axis is directed radially outward. Rotor of a rotating electric machine.

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