JP2543173Y2 - Brushless resolver mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless resolver mounting structure, and more particularly, to reduce the overall length of a motor by bringing a resolver case into contact with a bearing provided on a motor flange, thereby improving the coupling accuracy between the motor and the resolver. To a new improvement to improve.

[0002]

2. Description of the Related Art As a conventional brushless resolver mounting structure of this type, for example, in the case of a motor with a rotation detector using an encoder, there is a configuration disclosed in Japanese Patent Application Laid-Open No. 1-55041. As a configuration using the resolver in the same configuration as this configuration, there can be mentioned a configuration manufactured by the present applicant shown in FIG.

In FIG. 2, reference numeral 1 denotes a cup-shaped motor case, and a motor flange 2 is attached to an opening 1a of the motor case 1. Front lid 1b of motor case 1 and motor flange 2
Is provided with a pair of bearings 3, 4.
A motor shaft 6 having a rotor 5 is rotatably provided between the four.

A stator 7 having a stator winding 7 a is provided on the inner surface of the motor case 1, and a resolver case 10 having a resolver stator 8 and a stator transformer 9 is provided on the motor flange 2. An extension shaft 6 a of the motor shaft 6 is located in the resolver case 10 through the motor flange 2.
Is fitted with a hollow resolver shaft 13 having a resolver rotor 11 and a rotor transformer 12.

[0005]

Problems to be Solved by the Invention Since the conventional brushless resolver mounting structure is configured as described above, the following problems exist. That is, since the bearing provided on the motor flange and the resolver case are separated from each other without being directly connected to each other, the overall length is increased, and it is impossible to shorten the axis of this type of motor. In addition, since the resolver case is coupled to the motor flange by forming the spigot portion, it has been extremely difficult to improve the coupling accuracy between the motor and the resolver during coupling.

The present invention has been made to solve the above-described problems. In particular, the entire length of the motor is shortened by bringing the resolver case into contact with a bearing provided on a motor flange, thereby reducing the length of the motor. It is an object of the present invention to provide a brushless resolver mounting structure that improves the coupling accuracy with a resolver.

[0007]

A brushless resolver mounting structure according to the present invention comprises a motor shaft rotatably provided on a motor flange via a bearing, and a motor shaft provided on the motor flange and in contact with the bearing. A resolver case, a resolver stator and a stator transformer provided in the resolver case, and a resolver shaft directly connected to the motor shaft and having a resolver rotor and a rotor transformer.

More specifically, the resolver shaft is connected to an inner race of the bearing.

[0009]

In the brushless resolver mounting structure according to the present invention, since the resolver case is provided in direct contact with the bearing provided on the motor flange, the distance between the resolver case and the motor flange is greatly reduced. Motor can be reduced in overall length.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a brushless resolver mounting structure according to the present invention will be described in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals. FIG. 1 is a cross-sectional view showing a brushless resolver mounting structure according to the present invention.

In the figure, reference numeral 2 denotes a motor flange, and a bearing 4 is provided on an inner surface 2a of the motor flange 2. The inner race 4a of the bearing 4 is fitted and positioned on the outer peripheral step portion 20 of the motor shaft 6.
The motor shaft 6 is connected to the motor flange 2 via the bearing 4.
It is provided in.

A cylindrical resolver case 10 is directly provided on the motor flange 2 via mounting bolts 21. A ring-shaped recess 10a formed at the lower portion of the resolver case 10 Fit to outer ring 4b,
The bearing 4 is positioned by being urged from above by a resolver case 10.

On the inner surface 10a of the resolver case 10, a resolver stator 8 having a resolver stator winding 8a and a stator transformer 9 having a stator transformer winding 9a are provided in series.

A resolver shaft 13 is provided on the end surface 6a of the motor shaft 6, and a fixing bolt 22 passing through the resolver shaft 13 in the axial direction is screwed into a screw hole 6b formed in the motor shaft 6. As a result, the motor shaft 6 and the resolver shaft 13 are connected in series and integrally.

A resolver rotor 11 having a resolver rotor winding 11a and a transformer rotor 12 having a rotor transformer winding 12a are provided on the outer periphery of the resolver shaft 13.

[0016]

[Effects of the Invention] The brushless resolver mounting structure according to the present invention is configured as described above, so that the following effects can be obtained. That is, the resolver case is
Since it is directly coupled to the bearing provided on the motor flange, the overall length of this type of motor with a detector can be greatly reduced. Also, there is no need to form a resolver spigot on the motor flange, and the structure can be simplified. In the conventional hollow shaft type resolver, precise dimensions are required for the inner diameter of the shaft and the hollow shaft. However, in the configuration of the present invention, only the outer diameter of the shaft needs to be controlled, and the manufacture is greatly facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a brushless resolver mounting structure according to the present invention.

FIG. 2 is a cross-sectional view showing a conventional brushless resolver mounting structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor flange 4 Bearing 4a Inner ring 6 Motor shaft 8 Resolver stator 9 Stator transformer 10 Resolver case 11 Resolver rotor 12 Rotor transformer 13 Resolver shaft

Claims (2)

(57) [Scope of request for utility model registration] A motor shaft (6) rotatably provided on a motor flange (2) via a bearing (4), and a motor shaft (6) provided on the motor flange (2) in contact with the bearing (4). The resolver case (10) provided, the resolver stator (8) and the stator transformer (9) provided in the resolver case (10), and the resolver rotor (11) and the rotor transformer directly connected to the motor shaft (6). A brushless resolver mounting structure comprising a resolver shaft (13) having (12). 2. The brushless resolver mounting structure according to claim 1, wherein said resolver shaft (13) is connected to an inner ring (4a) of said bearing (4).