JP2015033176A - Dynamo-electric machine for dynamo-testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for efficient air cooling of the interior of a casing, without giving any disturbance to oscillation of the casing, even in a dynamo-electric machine where the casing is supported pivotally.SOLUTION: Even in a dynamo-electric machine 1 where an annular gap 10 is provided between the inner peripheral surface of the trunk 2b of a casing 2 and the outer peripheral surface of a stator 3, a cooling air supply port 6 is provided in the axial center of the trunk 2b of a casing 2 so as to open to the gap 10, thus supporting the casing 2 pivotally, interior of the casing 2 can be air cooled efficiently by preventing the wind pressure of cooling air from disturbing oscillation of the casing 2.

Description

  The present invention relates to a dynamo test apparatus rotating electrical machine used as a pseudo load source of a dynamo test apparatus.

  Dynamo test equipment measures various performances of test objects such as automobiles. As a pseudo load source that applies a pseudo load to the output of the test object or outputs a pseudo load to the test object. A rotating electrical machine is used. This dynamo test machine rotating electrical machine used as a pseudo load source is provided with a rotor that rotates on the inner peripheral side of a stator fixed in a cylindrical casing, and provides a pseudo load with respect to the output of a device under test. Acts as a generator, and acts as a motor when a pseudo load is output to the device under test.

  In the dynamo test apparatus, the casing 2 of the rotating electrical machine is fixed to the base, and the cylindrical casing 2 is swung in the circumferential direction as in the chassis dynamo test apparatus shown in FIGS. 4 (a) and 4 (b), for example. There is one in which the torque of a pseudo load acting on the oscillating rotating electrical machine 1 is measured by being supported by the base 22 so as to be movable.

  Since the dynamo test apparatus rotating electrical machine described above continues to receive a large torque in the direction opposite to the generated torque, the amount of heat generated by the stator, rotor, etc. in the casing is larger than that of a normal generator or motor. In order to suppress this heat generation, there is a dynamo test apparatus rotating electrical machine in which cooling air is forcibly supplied into a casing to air-cool the inside (for example, see Patent Document 1). In what is described in Patent Document 1, cooling air is supplied to the inside by a blower from supply ports provided at both ends of the casing body, and the supplied cooling air is externally supplied from a discharge port provided at the center of the body part. To be discharged.

  Although not a dynamo testing machine rotating electrical machine, cooling air is supplied by a cooling fan from a supply port provided on one end side of the cylindrical casing in the axial direction, and the supplied cooling air is supplied to an end face on the other end side. There is also a motor that discharges from the outlet (see, for example, Patent Document 2).

JP 2008-61468 A JP 2008-187792 A

  Since the dynamo testing apparatus rotating electrical machine described in Patent Document 1 has a cooling air supply port provided at the end of a cylindrical casing, for example, as shown in FIGS. When used in a chassis dynamo test apparatus that supports the casing in a swingable manner, the wind pressure of the cooling air forcedly supplied from the supply port at the end of the casing may cause the balance of the swingable casing to be lost. For this reason, the wind pressure of the cooling air becomes a disturbance of the swing of the casing, and there is a problem of hindering accurate measurement of the pseudo load torque and the like.

  Accordingly, an object of the present invention is to enable efficient air cooling of the inside of a casing without causing disturbance to the swing of the casing, even in a rotating electric machine in which the casing is swingably supported.

  In order to solve the above problems, the present invention includes a stator fixed in a cylindrical casing, and a rotor that rotates on the inner peripheral side of the stator, and forcibly supplies cooling air into the casing. In a dynamo testing apparatus rotating electrical machine provided with a supply port for supply and a discharge port for discharging the supplied cooling air to the outside, an annular shape is formed between the inner peripheral surface of the casing body and the outer peripheral surface of the stator. The cooling air supply port is provided at the axially central portion of the body of the casing, and the annular gap is opened.

  That is, an annular gap is provided between the inner peripheral surface of the casing body and the outer peripheral surface of the stator, and a cooling air supply port is provided in the axial center of the casing body to open the annular gap. As a result, even in a rotating electrical machine in which the casing is swingably supported, the inside of the casing can be efficiently air-cooled so that the wind pressure of the cooling air does not become a disturbance of the swing of the casing.

  The rotating electrical machine is suitable for a dynamo test apparatus that supports the casing so as to be swingable in the circumferential direction.

  By providing a plurality of ribs for partitioning the annular gap in the circumferential direction, the cooling air supplied to the annular gap is caused to flow out to both sides of the annular gap in the axial direction, and heat is exposed on both axial sides of the annular gap. The coil ends on both sides of the stator that are easy to perform can be air-cooled equally and efficiently.

  By providing the cooling air discharge port at the axially central portion of the casing body at a position opposite to the supply port in the circumferential direction, the cooling air discharge reaction force can be In addition, the cooling air can be evenly distributed to both sides in the axial direction inside the casing.

  The dynamo testing machine rotating electrical machine according to the present invention is provided with an annular gap between the inner peripheral surface of the casing body and the outer peripheral surface of the stator, and the cooling air supply port is the central portion in the axial direction of the casing body. Even if it is a rotating electrical machine in which the casing is swingably supported, the inside of the casing is made to prevent the wind pressure of the cooling air from becoming a disturbance of the swinging of the casing. Air cooling can be performed efficiently.

A longitudinal sectional view showing an embodiment of a rotating electrical machine for a dynamo test apparatus Sectional view along the line II-II in FIG. Fig. 2 is a developed view of the annular gap in Fig. 2 as seen from the outer diameter side. (A) is a schematic side view showing a chassis dynamo test apparatus using the rotating electrical machine of FIG. 1, and (b) is a partially omitted plan view of (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, this dynamo testing machine rotating electrical machine 1 is provided with a rotor 4 that rotates on the inner peripheral side of a stator 3 fixed in a cylindrical casing 2. A pseudo load is applied to the output of the device under test from one end or both ends of the rotating shaft 5, or a pseudo load is output to the device under test.

  The casing 2 is closed at both ends with lids 2a, and a supply port 6 for forcibly supplying cooling air for air-cooling the interior to the axial center of the body 2b, and the supplied cooling air to the outside. A discharge port 7 for discharging is provided at positions opposite to each other in the circumferential direction. When the cooling air is forcibly supplied into the casing 2, a blower blower is connected to the supply port 6 or a suction blower is connected to the discharge port 7.

  A bearing case 9 housing the rolling bearing rotor 8 is fixed to the lid portions 2 a on both sides of the casing 2, and the rotating shaft 5 of the rotor 4 is supported on both sides of the casing 2. An annular gap 10 is provided between the inner peripheral surface of the body 2b of the casing 2 and the outer peripheral surface of the stator 3, and the coil ends 3a of the stator 3 are exposed on both axial sides of the gap 10. Yes.

  As shown in FIGS. 2 and 3, the annular gap 10 is provided with a plurality of ribs 11 extending in the axial direction so as to partition the gap 10 in the circumferential direction. 2 is fixed. In addition, a notch portion 12 is formed in the central portion of each rib 11 in the axial direction so as to form a gap with the outer peripheral surface of the stator 3 and communicate with the adjacent gap 10 that is partitioned.

  The cooling air supply port 6 and the discharge port 7 are open at the axial center of the annular gap 10. The supply port 6 is opened between the two ribs 11a, and the discharge port 7 is opened across both sides of the rib 11a where the central portion is interrupted. The supply port 6 and the discharge port 7 may be opened between the ribs or may be opened across the ribs.

  As shown by arrows in FIG. 3, most of the cooling air supplied from the supply port 6 to the central portion of the gap 10 between the two ribs 11 passes from the gap 10 between the two ribs 11 to both sides in the axial direction. The coil ends 3a that flow out and are exposed on both sides in the axial direction of the stator 3 and easily generate heat are efficiently air-cooled. A part of the cooling air sequentially flows into the adjacent gaps 10 partitioned from the notches 12 of the ribs 11, and also flows out from the circumferentially adjacent gaps 10 to both sides in the axial direction, so that the stator 3 coil end 3a is air-cooled. Cooling air that flows out from each gap 10 to both sides in the axial direction and cools the inside of the casing 2 flows into the partition portion of the gap 10 provided with the discharge port 7 from both sides in the axial direction, and opens at the center in the axial direction. It is discharged to the outside from the discharge port 7 that performs.

  Therefore, even in the rotating electrical machine 1 in which the casing 2 is swingably supported, the wind pressure or discharge reaction force of the cooling air that is forcibly supplied does not disturb the swing of the casing 2, and The inside of the casing 2 is air-cooled equally and efficiently on both sides in the axial direction.

  FIGS. 4A and 4B show a chassis dynamo test apparatus using the rotating electrical machine 1 described above. In this dynamo test apparatus, a pair of rotating drums 21 on which driving wheels 31 of an automobile 30 to be tested are mounted are installed on both sides of a rotating shaft 5 of a rotating electrical machine 1, and an outer peripheral surface of a casing 2 of the rotating electrical machine 1 is attached to a base. This is swingably supported by an oil film bearing portion 23 having a circular arc surface provided on the base 22. A load cell 25 for measuring torque acting on the rotating electrical machine 1 is attached between the arm 24 extending in the radial direction of the casing 2 and the base 22.

  As shown by the solid arrow in FIG. 3A, when the driving wheel 31 is rotationally driven, the rotating electrical machine 1 becomes a generator and applies a pseudo load that resists the rotation of the driving wheel 31 via the rotating drum 21. To do. In addition, as indicated by a dotted arrow in FIG. 3A, the rotary drum 21 can be rotationally driven using the rotating electrical machine 1 as a motor, and a pseudo load can be output to the drive wheels 31.

  In the above-described embodiment, the stator is fixed by providing a plurality of ribs that partition the annular gap between the casing and the stator in the circumferential direction. However, these ribs can be omitted, and the stator fixing means is arbitrarily designed. be able to.

  In the above-described embodiment, the casing of the rotating electrical machine is swingably supported and used in the chassis dynamo testing apparatus that applies or outputs a pseudo load from both sides of the rotating shaft. However, the dynamo testing apparatus rotating electrical machine according to the present invention is Also, it can be used for other dynamo testing devices such as a type that fixes the casing and a type that applies or outputs a pseudo load from one side of the rotating shaft.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 2 Casing 2a Lid 2b Body 3 Stator 3a Coil end 4 Rotor 5 Rotating shaft 6 Supply port 7 Discharge port 8 Bearing 9 Bearing case 10 Gap 11, 11a Rib 12 Notch 21 Rotating drum 22 Base 23 Oil film Bearing section 24 Arm 25 Load cell 30 Car 31 Driving wheel

Claims (4)

A stator fixed in a cylindrical casing;
A rotor that rotates on the inner peripheral side of the stator,
In the dynamo testing apparatus rotating electrical machine provided with a supply port for forcibly supplying cooling air into the casing and a discharge port for discharging the supplied cooling air to the outside,
An annular gap is provided between the inner peripheral surface of the trunk portion of the casing and the outer peripheral surface of the stator,
The dynamo testing machine rotary electric machine is characterized in that the cooling air supply port is provided in the axially central portion of the body of the casing and is opened in the annular gap.   The dynamo testing machine rotating electrical machine according to claim 1, wherein the rotating electrical machine is used in a dynamo testing apparatus that supports the casing in a swingable manner in the circumferential direction.   The dynamo testing machine rotating electrical machine according to claim 1 or 2, further comprising a plurality of ribs that partition the annular gap in the circumferential direction.   The dynamo testing device rotation according to any one of claims 1 to 3, wherein the cooling air discharge port is provided at a position opposite to the supply port in a circumferential direction in a central portion in an axial direction of a body portion of the casing. Electric.

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