JPH0545098Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling structure for a motor having a plurality of output shafts.

[Prior Art] Conventionally, the structure of a motor having two independent output shafts on one frame has two brackets 2, 2 at both ends of a cylindrical frame 1, as shown in FIG. 6 as a first example. ', and bracket 2,
The stator 3,
3' is provided. The stators 3, 3' are opposed to the rotors 4, 4' through an axial gap.
A hollow output shaft 5 and an output shaft 6 respectively fixed to the shaft 4' are provided independently. Furthermore, a water cooling pipe 7 is provided on the outer periphery of the frame 1 for forced cooling, and cooling fins are provided on the frame 1 as a method of natural cooling.

As a second example, Japanese Utility Model Application No. 60-166272 filed by the present applicant discloses a method in which a stator support part is provided in the center of the frame, stators are provided on both sides of the support part, and the stator is provided in the axial direction. It has been disclosed that rotors are provided through gaps, and heat pipes are embedded in the support portion in the radial direction.

[Problems to be Solved by the Invention] In the first example, the cooling pipe is provided on the outer periphery of the frame, which increases the overall structure of the motor and requires time and effort to wrap and fix the cooling pipe around the frame.

In addition, in the second example, the heat pipe is expensive, and even if the heat generated from the stator is transferred to the outer periphery of the frame by the heat pipe, sufficient cooling will not be achieved unless the frame is equipped with cooling fins etc. that have a large cooling effect. However, there were disadvantages such as not being able to obtain sufficient performance and resulting in an increase in the size of the motor.

An object of the present invention is to provide a motor cooling structure that is compact and has a large cooling effect by providing a cooling medium passage in a stator support.

[Means for Solving the Problems] The present invention provides a donut disc-shaped support section at the center of the inner side of a cylindrical frame, brackets at both ends of the frame, and brackets at both sides of the support section. first and second stators are fixed, the first and second rotors are provided opposite to the first and second stators through an axial gap, and the first rotation A hollow first output shaft supported by one bracket via a bearing is fixed to the rotor, and a hollow first output shaft supported by the other bracket and the support portion via a bearing is fixed to the second rotor. A two-output shaft motor to which a second output shaft protruding outward through a hollow part of the output shaft is fixed, a disc-shaped jacket provided at the center of the support part and opening on the outer periphery of the frame; The frame includes a cylindrical jacket that communicates with the opening of the disc-shaped jacket and extends in the length direction of the frame.

[Operation] The cooling medium flows into the annular jacket and the disc-shaped jacket from the inlet, and the heat generated in the stator is absorbed by the cooling medium through the support portion. The coolant whose temperature has increased passes from the disc-shaped jacket again through the annular jacket and flows out from the outlet together with the absorbed heat.

[Example] An embodiment of the present invention shown in the drawings will be described.

FIG. 1 is a front sectional view of an embodiment of the present invention, in which a donut disc-shaped support part 11 for fixing a stator is provided at the center inside a cylindrical frame 1, and the cross section is formed into a T-shape. be. Brackets 2, 2' are provided at both ends of the frame 1. Stators 3, 3 are fixed on both sides of the support part 11, and stator windings 31, 3
A resin having high thermal conductivity is filled between the support portion 1' and the support portion 11. A disc-shaped jacket 12 is provided at the center of the support part 11 and opens on the outer periphery of the frame 1 to form a disc-shaped space.
The cylindrical jacket 14 is connected to a cylindrical jacket 14 forming a cylindrical space extending in the longitudinal direction of the frame 1. The disc-shaped jacket 12 and the cylindrical jacket 14 are provided with a partition plate 15 extending radially through both jackets. The outer periphery of the cylindrical jacket 14 is closed by a cylindrical portion 16, and an inlet 17 and an outlet 18 for cooling medium are provided on both sides of the partition plate 15, respectively. The rotors 4, 4' are provided opposite to the stators 3, 3' with an axial gap in between, and a hollow shaft 5 supported by a bracket 2 via a bearing is fixed to the rotor 4, and the rotor 4 is rotated. The child 4' is supported by the bracket 2' and the support part 11 via bearings, and has a hollow output shaft 5.
An output shaft 6 that protrudes to the outside through a hollow portion is fixed.

When constructing the frame 1, as shown in FIG. 2, the frame 1 including the disc-shaped jacket 12 and the cylindrical jacket 14 is formed by integral casting, and a cylindrical body is formed by separately wrapping a strip-shaped steel plate around the frame 1. The outer periphery of the cylindrical jacket 14 may be closed by the portion 16.

Further, as shown in FIG. 3, the frame 1 is divided from the center of the support portion 11, that is, the center of the disc-shaped jacket 12 and the cylindrical jacket 14, to form a frame component 10, and the two frame components 1 are separated from each other.
0 may be placed back to back and the butted portions may be joined by welding or adhesive.

With the above configuration, the cooling medium is sent from the cooling medium sending device (not shown), flows into the cylindrical jacket 14 and the disk-shaped jacket 12 from the inlet 17, and the cooling medium is generated in the stator 3 via the support part. absorb heat. The coolant whose temperature has increased passes from the disc-shaped jacket 12 again through the cylindrical jacket 14, and flows out from the outlet 18 together with the absorbed heat.

Note that the inner surface of the disc-shaped jacket 12 has a fourth
As shown in FIG. 5 and FIG. 5, a plurality of rectifying fins 121 consisting of C-shaped protrusions are provided alternately from the inlet 16 to the outlet 17 to widen the contact area with the cooling medium and to increase the flow rate. The cooling efficiency may be increased by reducing the resistance.

[Effects of the invention] As described above, according to the invention, since the cooling medium jacket is provided on the support portion of the frame and stator, a cooling mechanism that is small and has low flow resistance of the cooling medium and high cooling efficiency can be achieved. This has the advantage of being able to provide a small motor with

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention;
The figure is a side view of the frame, partially shown in section.
The figure is a side sectional view of a frame component, FIG. 4 is a front sectional view showing another embodiment, FIG. 5 is a side sectional view of a frame component showing another embodiment, and FIG. 6 is a side sectional view showing a conventional example. It is a diagram. DESCRIPTION OF SYMBOLS 1... Frame, 11... Support part, 12... Disc-shaped jacket, 121... Rectifying fin, 13...
...Opening portion, 14...Disc-shaped jacket, 15...
Partition plate, 16...Cylindrical portion, 17...Inflow port, 1
8... Outlet, 2, 2'... Bracket, 3,
3'... Stator, 4, 4'... Rotor, 5... Hollow output shaft, 6... Output shaft.

Claims (1)

[Claims for Utility Model Registration] 1. A donut disc-shaped support part is provided at the center of the inner side of a cylindrical frame, brackets are provided at both ends of the frame, and first and second brackets are provided on both sides of the support part, respectively. two stators are fixed, the first and second rotors are provided opposite to the first and second stators with an axial gap in between, and one of the rotors is fixed to the first rotor. A hollow first support is supported by a bracket via a bearing.
A second output shaft has an output shaft fixed thereto, is supported by the second rotor through the other bracket and the support part via a bearing, and projects outward through the hollow part of the first output shaft. a two-output shaft motor having a fixed output shaft, comprising: a disc-shaped jacket provided at the center of the support part and opening at the outer periphery of the frame; and a disc-shaped jacket connected to the opening of the disc-shaped jacket and extending in the longitudinal direction of the frame. A two-output shaft motor characterized by comprising a long cylindrical jacket and a long expanded cylindrical jacket. 2. The two-output shaft motor according to claim 1, wherein the disc-shaped jacket and the cylindrical jacket are provided with a partition plate extending radially through both the jackets. 3. The two-output shaft motor according to claim 1 or 2, wherein two frame parts are formed by dividing the frame into two at the center thereof and are joined back to back. 4. The two-output shaft motor according to claim 1, wherein a plurality of rectifying fins each having a C-shaped protrusion are provided on the inner surface of the disc-shaped jacket from the inlet to the outlet. .