JP6916501B2 - Resolver rotor fixed structure, resolver, and motor - Google Patents

Description

The present invention relates to a resolver rotor fixing structure, a resolver and a motor, and more particularly to a resolver rotor fixing structure capable of reducing the size of the entire motor.

FIG. 3 is a semi-cross-sectional view of a main part showing a method of attaching a brushless resolver rotor to a conventional motor. As shown in the figure, the resolver rotor is conventionally fixed to the motor by extending the shaft length of the motor shaft 59 from the height of the resolver case 51 and fixing it with a set screw 54. Alternatively, a method has been adopted in which the extended motor shaft is threaded and fastened with a nut.

Patent applications have been filed for the technique of fixing the resolver to the motor. For example, Patent Document 1 described later describes a rotor having a hollow cylindrical rotor shaft, a rotor core fixed to the outer peripheral surface thereof, and an outer peripheral surface of the rotor shaft for the purpose of suppressing the influence of a magnetic field from a motor and saving space. A rotor bearing that rotatably supports the rotor shaft in contact with the rotor shaft and a resolver that detects the rotation of the rotor are provided, and the entire resolver is arranged radially inside the inner peripheral surface of the rotor shaft. Disclosed is a configuration in which at least a part of the resolver is arranged so as to overlap the rotor shaft when viewed in the radial direction of the rotor.

Japanese Unexamined Patent Publication No. 2015-87308 "Rotating Electric Machinery"

As shown in FIG. 3, in the conventional fixing method, since it is necessary to extend the shaft length of the motor shaft 59 as compared with the resolver case 51, there is a problem that the size of the motor 530 as a whole becomes large. On the other hand, although the above-mentioned document disclosure technique is intended to save space, it is a technique applied only when the outer diameter of the resolver is smaller than the inner diameter of the motor shaft, and there is a limit. A technique applicable when the outer diameter of the resolver is larger than the inner diameter of the motor shaft is required.

Therefore, the problem to be solved by the present invention is to eliminate the problems of the prior art and realize space saving when the outer diameter of the resolver is larger than the inner diameter of the motor shaft, thereby making the size of the entire motor more compact. It is to provide a resolver rotor fixing structure that makes it possible.

As a result of examining the above problems, the inventor of the present application shortens the motor shaft to provide a screw hole for a fixing screw in the shaft center thereof, and the hollow shaft of the resolver rotor hides the head of the fixing screw. We have found that it can be solved by using a stepped shaft, and based on this, we have completed the present invention. That is, the inventions claimed in the present application as means for solving the above problems, or at least the inventions disclosed, are as follows.

[1] A resolver rotor fixing structure for fixing the resolver rotor to the motor shaft, and a diameter-expanded step portion having an open end provided on the resolver hollow shaft and a diameter- expanded step portion, and a motor shaft end. It consists of a screw hole portion provided in the portion, and when the resolver hollow shaft is attached to the motor shaft, the diameter-expanded step portion has the same height as the motor shaft end portion, or the diameter-expanded step portion is formed. Both are formed so that the portion is higher, and due to this configuration, when a fixing screw having a head having a diameter larger than that of the motor shaft is fixed to the screw hole portion, the head becomes the head. A resolver rotor fixing structure, characterized in that the resolver rotor is fixed to the motor shaft by abutting on the enlarged diameter step portion.
[2] The resolver rotor fixing structure according to [1], which has a head having a diameter larger than that of the motor shaft and is provided with a fixing screw that fits the screw hole portion.

[3] A resolver according to any one of [1] and [2], wherein an enlarged diameter step portion for forming the resolver rotor fixing structure is provided on the hollow shaft.
[4] A motor characterized in that a screw hole portion for forming the resolver rotor fixing structure according to any one of [1] and [2] is provided at a shaft end portion.
[5] A motor characterized in that the resolver is fixed by the resolver rotor fixing structure according to any one of [1] and [2].

Since the resolver rotor fixing structure, resolver, and motor of the present invention are configured as described above, they can save space, thereby making the overall size of the motor more compact and the entire motor. Space saving can be realized. INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a space-saving product when a motor and a brushless resolver are combined.

It is a half cross-sectional view of a main part which shows the method of attaching a resolver rotor to a motor of this invention. It is an enlarged view of the main part of FIG. It is explanatory drawing which shows the structure of the resolver rotor fixing structure which concerns on FIG. It is a half cross-sectional view of a main part which shows the method of attaching a resolver rotor to a conventional motor.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a semi-cross-sectional view of a main part showing a method of attaching a resolver rotor to a motor of the present invention. Further, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 2-2 is an explanatory view showing a configuration of a resolver rotor fixing structure according to FIG. As shown in these figures, the resolver rotor fixing structure 10 of the present invention is a structure for fixing the resolver rotor 1 to the motor shaft 9, and has an enlarged step portion having an open end provided on the resolver hollow shaft 2 (a diameter-expanded step portion (). The diameter-expanded step portion) 3 and the screw hole portion 6 provided at the motor shaft end portion 8 are formed, and when the resolver hollow shaft 2 is attached to the motor shaft 9, the diameter-expanded step portion 3 becomes the motor shaft end portion 8. The main configuration is that both are formed so as to have the same height as (the example shown in the figure) or to be higher in the enlarged diameter step portion 3 (described later with reference to FIG. 2-2).

According to the present resolver rotor fixing structure 10 having such a configuration, when the fixing screw 4 having the head portion 5 having a diameter larger than that of the motor shaft 8 is fixed to the screw hole portion 6, the head portion 5 has an enlarged diameter step portion 3. The resolver rotor 1 is fixed to the motor shaft 9 by abutting against. As the fixing screw 4, a screw having a head portion 5 having a height equal to or lower than the end face of the resolver hollow shaft 2 in a fixed state is used. As a result, in the fixing method of the present invention, when the resolver rotor 1 is fixed to the motor shaft 9, there is no portion protruding beyond the end face of the resolver hollow shaft 2, and the space saving portion S is compared with the conventional method. , Space saving.

As shown in FIG. 2, the resolver rotor fixing structure 10 of the present invention has a head portion 5 having a diameter larger than that of the motor shaft 9 and includes a fixing screw 4 that fits into the screw hole portion 6. On the other hand, as shown in FIG. 2-2, only the portion excluding the fixing screw 4 corresponds to the resolver rotor fixing structure 10B of the present invention.

Note that FIG. 2-2 shows two patterns of structural examples of the resolver rotor structure of the present invention. (A) in the figure is a configuration example already described with reference to FIG. 1 and the like. In the figure (b), when the resolver hollow shaft 22 is attached to the motor shaft 29, both are formed so that the diameter-expanded step portion 23 is higher than the motor shaft end portion 28. The rotor structure 210. In any of the examples, the resolver rotor can be fixed to the motor shaft in a space-saving state by fixing the fixing screw to the fixing screw.

It should be noted that the resolver 20 in which the enlarged diameter step portion 3 for forming the resolver rotor fixing structure 10 of the present invention described above is provided in the hollow shaft 2, and the motor in which the screw hole portion 6 is also provided in the shaft end portion 8. 30 is also within the scope of the present invention. Further, the motor 30 to which the resolver 20 is fixed by the resolver rotor fixing structure 10 of the present invention is also within the scope of the present invention.

According to the resolver rotor fixing structure, the resolver, and the motor of the present invention, space saving can be realized, whereby the size of the entire motor can be made more compact, and the space saving of the motor as a whole can be realized. Therefore, it is an invention with high industrial applicability in the fields of resolver, motor manufacturing, use, and all related fields.

0 ... Resolver stator 1 ... Resolver rotor 2, 22 ... Resolver hollow shaft 3, 23 ... Diameter expansion step 4 ... Fixing screw 5 ... Fixing screw head 6, 26 ... Screw hole part 8, 28 ... Motor shaft end Parts 9, 29 ... Motor shafts 10, 210 ... Resolver rotor fixing structure 20 ... Resolver 30 ... Motor S ... Space saving 51 ... Resolver case 54 ... Set screw 59 ... Motor shaft 520 ... Resolver 530 ... Motor

Claims (5)

The resolver rotor a resolver rotor fixing structure for fixing to the motor shaft, the enlarged diameter stepped portion where a stepped portion is expanded having an open end provided on the resolver hollow shaft, is provided on the motor shaft end When the resolver hollow shaft is attached to the motor shaft, the diameter-expanded step portion becomes the same height as the motor shaft end portion, or the diameter-expanded step portion is located. Both are formed so as to be high, and due to such a configuration, when a fixing screw having a head having a diameter larger than that of the motor shaft is fixed to the screw hole portion, the head becomes the diameter-expanding step. A resolver rotor fixing structure, characterized in that the resolver rotor is fixed to the motor shaft by abutting on the portion. The resolver rotor fixing structure according to claim 1, further comprising a fixing screw having a head diameter larger than that of the motor shaft and fitting to the screw hole portion. The resolver according to any one of claims 1 and 2, wherein an enlarged diameter step portion for forming the resolver rotor fixing structure is provided on the hollow shaft. A motor characterized in that a screw hole portion for forming the resolver rotor fixing structure according to any one of claims 1 and 2 is provided at a shaft end portion. A motor, wherein the resolver is fixed by the resolver rotor fixing structure according to any one of claims 1 and 2.

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