WO2009011462A1 - Rotary machine - Google Patents

Abstract

A rotary machine includes a shaft (58) rotatably arranged and having a coolant channel (45) where a coolant can flow; a container hole (24A) which can contain a permanent magnet (31A); and a permanent magnet (31A) arranged inside the container hole (24A). The rotary machine further includes: a rotor fixed to the shaft (58); and an end plate (29) arranged at a rotor axial direction end (10a); a coolant channel (43) formed in the end plate (29) and communicating with the coolant channel (45) via an axial direction end (31a) of the permanent magnet (31A) so that a coolant can flow; and resin (26) which closes the space between openings (25a, 25b) of the container hole (24A) positioned at the rotor axial direction ends (10a, 10b) and the permanent magnet (31A) so as to suppress intrusion of the coolant into the container hole (24A).

Description

 Technical specification

 The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine in which a permanent magnet is cooled. Background art

 Conventionally, various electric motors having a cooling function have been proposed. For example, an electric motor described in Japanese Patent Application Laid-Open No. 2003-169448 supplies the lubricating oil supplied to the bearing member to the coil end to cool the coil end.

 In addition, the electric motor described in Japanese Patent Laid-Open No. 2006-006091 is provided with a jet outlet that jets cooling oil toward the permanent magnet of the rotor, and removes magnetic impurities by adsorbing the magnet to the permanent magnet. Cooling oil from which magnetic impurities have been removed is sprayed onto the coil. In this way, the insulation performance of the coil is prevented from being deteriorated due to damage to the insulating film on the coil surface.

 In the rotating electrical machine described in the above Japanese Patent Laid-Open No. 2006-006091, the lubricating oil enters the housing hole that houses the permanent magnet. Then, the lubricating oil that has entered the accommodation hole oozes outward in the radial direction from the gap between the laminated steel plates constituting the rotor. Then, lubricating oil enters between the rotor and the stator, and the rotational resistance of the rotor increases.

 In the electric motor described in Japanese Patent Laid-Open No. 2003-169448, the permanent magnets provided in the stator are not cooled. Disclosure of the invention

 The present invention has been made in view of the above-described problems, and its object is to suppress the seepage of refrigerant between the rotor and the stator while cooling the permanent magnet. An object of the present invention is to provide a rotating electrical machine in which the rotational resistance of the rotor is reduced.

The rotating electrical machine according to the present invention is provided so as to be rotatable, and the first refrigerant passage through which the refrigerant can flow. A rotating shaft in which a path is formed, and a housing hole in which a permanent magnet can be housed are formed. The rotor has a permanent magnet provided in the housing hole, and a rotor fixed to the rotating shaft. The rotating electrical machine includes a stator facing the rotor and having a plurality of winding phases, an end plate provided at an axial end of the rotor, and a permanent magnet formed on the end plate. And a second refrigerant passage that is in communication with the first refrigerant passage and through which the refrigerant can flow. And at least an opening edge portion of the housing hole located at the axial end of the rotor and a closing member capable of blocking the refrigerant from entering the housing hole by closing the space between the permanent magnet and the permanent magnet. .

 Preferably, the closing member is filled in the accommodation hole and extends over both axial end faces located in the axial direction of the rotor. Preferably, at least a part of the axial end portion of the permanent magnet is exposed from the closing member. Preferably, the closing member is a resin.

 In addition, it is planned from the beginning of the application that the configurations shown above may be appropriately combined as necessary.

 According to the rotating electrical machine according to the present invention, the permanent magnet can be cooled, and further, the refrigerant can be prevented from entering between the rotor and the stator, and the rotational resistance of the rotor can be reduced. Can be planned. Brief Description of Drawings

 FIG. 1 is a cross-sectional view showing a rotating electrical machine according to an embodiment of the present invention.

 FIG. 2 is an enlarged cross-sectional view of a part of FIG.

 FIG. 3 is a cross-sectional view taken along the line I I I—I I I in FIG.

 FIG. 4 is a cross-sectional view showing a first modification of the rotating electrical machine according to the embodiment of the present invention. FIG. 5 is a cross-sectional view showing a second modification of the rotating electrical machine according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

A rotating electrical machine according to the present embodiment will be described with reference to FIGS. Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. Ma In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified.

 FIG. 1 is a cross-sectional view showing a rotating electrical machine according to an embodiment of the present invention. The rotating electrical machine shown in the figure is a motor installed in a hybrid vehicle that uses an internal combustion engine such as a gasoline engine or diesel engine and a motor powered by a rechargeable secondary battery (battery) as a power source. It is.

 Referring to FIG. 1, rotating electrical machine 100 includes a rotor 10 and a stator 50 that is disposed on the outer periphery of rotor 10 and is disposed to face rotor 10. The rotor 10 is provided on a shaft 58 extending along the central axis 10 1. The shaft 58 rotates around the central axis 10 0 1 together with the rotor 10.

 The rotor 10 has a rotor core 20 and a permanent magnet 3 1 embedded in the rotor core 20. That is, the rotating electrical machine 100 is an IPM (Interior Permanent Magnet) motor.

 The rotor core 20 has a cylindrical shape along the central axis 10 0 1. The rotor core 20 is composed of a plurality of electromagnetic steel sheets 21 stacked in the axial direction of the central axis 10 1. An end plate 29 is provided on the end surface of the rotor 10 located in the direction of the central axis 101.

 The stator 50 includes a stator core 55 and a coil 51 wound around the stator core 55. The stator core 55 is composed of a plurality of electromagnetic steel plates 52 laminated in the axial direction of the central shaft 101. Note that the rotor core 20 and the stator core 55 are not limited to magnetic steel sheets, and may be formed of, for example, a dust core.

 The coil 51 is electrically connected to the control device 70 by a three-phase cable 60. The three-phase cable 60 consists of a U-phase cable 61, a V-phase cable 62, and a W-phase cable 63. Coil 5 1 is composed of a U-phase coil, a V-phase coil, and a W-phase coil. U-phase cable 61, V-phase cable 6 2, and W-phase cable 6 3 are connected to the terminals of these three coils, respectively. It is connected.

A torque command value to be output by the rotating electrical machine 100 is sent to the control device 70 from an ECU (Electrical Control Unit) 80 mounted on the hybrid vehicle. The controller 70 is used to output the torque specified by the torque command value. A motor control current is generated, and the motor control current is supplied to the coin 51 via the three-phase cable 60.

 Fig. 2 is an enlarged cross-sectional view of a part of Fig. 1, and Fig. 3 is an I II diagram of Fig. 2.

1 is a sectional view taken along line I I. FIG. As shown in FIG. 3, the rotor 10 is provided with magnet groups 30A to 30H that define a plurality of magnetic poles. Each of the magnet groups 30A to 30H includes two permanent magnets. For example, the magnet group 30A includes two permanent magnets 31A and 31B. The permanent magnet 3 1 A and the permanent magnet 31 B are arranged in the circumferential direction of the rotor 10. The magnetic poles on the outer peripheral side of the rotor 10 of the magnet groups 30A to 30H adjacent in the circumferential direction of the rotor 10 are different from each other.

 The rotating electrical machine 100 includes a magnet cooling passage 40 that cools the permanent magnets 31 A and 31 B that constitute the magnet groups 30 A to 30 H. The magnet cooling passage 40 communicates with the refrigerant passage 45 formed in the shaft 58 and the refrigerant passage 45, and the end plate

29 and a refrigerant passage 43 defined by the axial end faces 10 a and 10 b of the rotor 10, and a discharge hole 44 communicating with the refrigerant passage 43. The refrigerant passage 45 includes an axial passage 41 that extends in the direction of the central shaft 101 and a radial passage 42 that is connected to the axial passage 41 and extends in the radial direction of the shaft 58. The radial passage 42 extends toward the magnet groups 30A to 30H. Then, the refrigerant passage 43 extends from the radially inner side of the rotor 10 to the outer side so that the circumferential length of the rotor 10 increases.

 The refrigerant passage 43 passes through the axial end surfaces 3 1 a and 3 1 b of the permanent magnets constituting the magnet groups 30A to 30H. For this reason, the permanent magnets 3 1 A and 3 1 B are cooled by the refrigerant A flowing in the refrigerant passage 43. The refrigerant A flowing through the axial passage 41 enters the radial passage 42, and then the refrigerant A enters the refrigerant passage 43.

Here, as shown in FIG. 2, the permanent magnet 31 A is accommodated in a magnet accommodation hole 24 A formed in the rotor core 20. The magnet accommodation hole 24 A extends in the direction of the central axis 101 and reaches the axial end faces 10 a and 10 b of the rotor 10. The magnet housing hole 24 A is filled with a resin (blocking member) 26. This resin 26 fills the gap between the inner peripheral surface of the rotor core 20 that defines the magnet housing hole 24 A and the permanent magnet 31 A that is housed inside. The axial end face of the permanent magnet 3 1 A

3 1 a and 3 l b are not covered with the resin 26 and are exposed from the resin 26. For this reason, even if the refrigerant A is supplied into the refrigerant passage 43, the refrigerant A can be prevented from penetrating into the magnet housing hole 24A. Thus, the magnet receiving hole 2

Since the refrigerant A can be prevented from entering 4 A, the refrigerant A can be prevented from seeping out from between the electromagnetic steel sheets of the rotor core 20 to the outer peripheral surface of the loader core 20. As a result, the refrigerant A can be prevented from entering between the rotor 10 and the stator 50, and an increase in the rotational resistance of the rotor 10 can be suppressed. In particular, since the resin 26 is formed over substantially the entire inner surface of the rotor core 20 that defines the magnet housing hole 24A, the inner surface of the rotor 10 that defines the magnet housing hole 24A. It is possible to prevent the refrigerant A from seeping out from the surface toward the outer surface of the rotor 10. Further, the permanent magnet 31 can be satisfactorily adhered to the rotor core 20 by the resin 26, and the permanent magnet 31 can be satisfactorily fixed to the rotor core 20. Since the axial end surfaces 3 1 a and 3 1 b of the permanent magnet 3 1 A are exposed from the resin 26, the permanent magnet 3 1 A is cooled well by the refrigerant A. Thus, by cooling the permanent magnet 3 1 A, the thermal demagnetization of the permanent magnet 3 1 A can be suppressed.

 In this way, the permanent magnets constituting each of the magnet groups 3 OA to 3 OH are cooled and then discharged from the discharge holes 44. As the resin 26, for example, a resin material such as epoxy, unsaturated polyester, polyamide, polypropylene, polybutylene terephthalate, polyethylene terephthalate, or polyethylene sulfide can be employed.

FIG. 4 is a cross-sectional view showing a first modification of the rotating electrical machine according to the embodiment of the present invention. In the example shown in FIG. 4, the opening edges of the magnet receiving holes 24 4 A located in the axial end faces 10 a and 10 b of the rotor 10 24 a and the opening edges of the 25 b and the permanent Resin 2 6 is provided to block between magnet 3 1 A. Also in this rotating electric machine, since the space between the permanent magnet 3 1 A and the openings 25 a and 25 b is closed, it is possible to prevent the refrigerant A from entering the magnet housing hole 24 A. it can. In this way, resin 2 6 is magnetized. It is not limited to the case of filling the capacity hole 24 A, but even if the gap between the permanent magnet 3 1 A and the openings 2 5 a and 2 5 b is closed by the resin 2 6, the refrigerant A is magnetized. Housing hole 2

4 Intrusion into A can be suppressed.

 FIG. 5 is a cross-sectional view showing a second modification of the rotating electrical machine according to the embodiment of the present invention. As shown in FIG. 5, plate-like closing members 2 2 a and 2 2 b located on the axial end faces 10 a and 10 b of the rotor 10 of the electromagnetic steel plate 21 are composed of the magnet housing hole 2 4 openings 2

The opening of the gap defined between the opening edges of 5a and 25b and the permanent magnet 31 is closed. In this way, the flat plate member may be used to suppress the refrigerant A from entering the magnet housing hole 24.

 As described above, the embodiment of the present invention has been described. However, it should be considered that the embodiment disclosed herein is illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges. Industrial applicability

 The present invention can be applied to a rotating electrical machine, and is particularly suitable for a rotating electrical machine in which a permanent magnet is cooled.

Claims

The scope of the claims 1. a rotating shaft (58) provided with a first refrigerant passage (45) provided rotatably and through which a refrigerant can flow;  An accommodation hole (24A) capable of accommodating the permanent magnet (3 1 A) is formed, and the accommodation hole A rotor (10) having a permanent magnet (31A) provided in (24 A) and fixed to the rotating shaft (58);  A stator (50) facing the rotor (10) and having a plurality of winding phases, and an end plate (10a, 10b) provided on the axial end (10a, 10b) of the rotor (10) 29) and  The cooling medium is formed in the end plate (29), communicates with the first refrigerant passage (45) through the axial end portions (31a, 31b) of the permanent magnet (31A), and A second refrigerant passage (43) through which  The opening between the accommodation hole (24A) located at the axial end (10a, 10b) of the rotor (10) and the permanent magnet right (31A) are closed, Receiving hole (24 A) A rotating electrical machine comprising: a closing member (26) capable of suppressing entry of the refrigerant into the interior.  2. The closing member (26) is filled in the accommodation hole (24A) and extends across the axial end surfaces (10a, 1Ob) located in the axial direction of the rotor (10). The rotating electrical machine according to claim 1.  3. The rotating electrical machine according to claim 1, wherein at least a part of the axial end portion (31a, 31b) of the permanent magnet (31A) is exposed from the closing member (26). 4. The rotating electrical machine according to claim 1, wherein the closing member (26) is made of resin.