JP2008259318A - Resolver structure of brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve shortening of a shaft length and miniaturization of a motor by housing a rotary transformer and a resolver into the inside of a ring-like wall protruding inward a rear lid of a cylindrical case. <P>SOLUTION: A resolver structure of a brushless motor has a structure in which the rear lid (6) having a second bearing (5) is provided on the other end (1c) of the cylindrical case (1) having a stator (4) and a first bearing (2), the rotary transformer (20) and the resolver (22) are provided in the ring-like wall (40) of the rear lid (6) and the ring-like wall (40) is inserted in a rotor concave portion (21) of a rotor (8). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brushless motor resolver structure, and in particular, a rotating transformer and a resolver are housed inside a ring-shaped wall body protruding inward of a rear cover body of a cylindrical case, thereby achieving reduction in axial length and size reduction. For new improvements.

  Conventionally, as this type of brushless motor resolver structure that has been used, for example, the applicant did not file a patent application just because it was produced in-house and published in the sales catalog, but patent documents etc. are not disclosed, A typical configuration can be shown in FIG.

In FIG. 3, a reference numeral 1 indicates a cylindrical case, and a first bearing 2 is provided at one end 1 a of the cylindrical case 1.
An annular stator 4 having a stator winding 3 is provided on the inner surface 1b of the cylindrical case 1, and a rear lid body 6 having a second bearing 5 is provided on the other end 1c of the cylindrical case 1. ing.

  A rotary shaft 9 including a rotor 8 having a magnet 7 is rotatably provided between the bearings 2 and 5, and an extension shaft portion 9 a of the rotary shaft 9 includes the second bearing 5 and the rear lid body 6. It penetrates and is located so as to protrude into the sensor cover 10 provided at the rear part of the rear lid body 6.

  A rotor transformer 12 and a resolver rotor 13 are arranged in series along the axial direction on the outer periphery of the extension shaft portion 9a via a cylindrical insulator 11, and a concave portion is formed on an end surface of the rear lid body 6. A stator transformer 14 is fixedly arranged corresponding to the rotor transformer 12 via 6a, and a resolver stator 15 is fixed to the stator transformer 14 via a connecting member 16 so as to correspond to the resolver rotor 13. It is arranged.

The rotor transformer 12 and the stator transformer 14 constitute a rotary transformer 20, and the resolver rotor 13 and the resolver stator 15 constitute a resolver 22.
Therefore, in the above-described configuration, when a drive signal is applied to the stator winding 3 and the rotor 8 of the motor 30 rotates, the rotation of the rotor 8 is detected by the resolver 22, and the rotation detection signal is detected by the resolver. It is configured to be sent to the outside from the stator 15 side.

Since the conventional brushless motor resolver structure is configured as described above, the following problems exist.
In other words, since the rotary transformer and the resolver are arranged in series on the extended shaft portion where the rotating shaft is extended, the length in the axial direction, that is, to meet the user's desire to shorten the axial length is It was impossible.
In addition, it is necessary to provide accessory parts for fixing the rotary transformer and the resolver, and it is difficult to reduce the number of parts.

  A brushless motor resolver structure according to the present invention is provided on the inner surface of a cylindrical case and having a stator winding, a first bearing provided at one end of the cylindrical case, and the other end of the cylindrical case. A rear lid body having a second bearing, a ring-shaped wall body integrally provided on the rear lid body, and a rotary shaft rotatably provided in the cylindrical case via the bearings A rotor provided with a magnet provided on the rotating shaft, a rotor recess formed at one end of the rotor and in which the annular wall body is inserted, a stator transformer and a resolver stator provided on the inner wall of the annular wall body, A rotor transformer and a resolver rotor provided on a peripheral surface of the rotating shaft and corresponding to the stator transformer and the resolver stator, and rotated by the stator transformer and the rotor transformer; A transformer is formed, and the resolver is formed by the resolver stator and the resolver rotor, and the rotary transformer and the resolver are superposed on the rotor along a diameter direction of the rotor, and the second bearing Is a configuration located outside the resolver, and the second bearing is located inside the rotary transformer.

Since the brushless motor resolver structure according to the present invention is configured as described above, the following effects can be obtained.
That is, since the rotary transformer and the resolver are housed in a ring-shaped wall integrally formed inward from the rear lid provided at one end of the cylindrical case, the rotary transformer and the resolver are arranged in the diameter direction of the rotor. Along with the rotor, the axial length can be shortened and miniaturized.

  The present invention provides a brushless motor resolver structure in which a rotary transformer and a resolver are accommodated inside a ring-shaped wall body projecting inwardly of a rear cover body of a cylindrical case, so that the axial length is shortened and the size is reduced. The purpose is to provide.

Hereinafter, preferred embodiments of a brushless motor resolver structure according to the present invention will be described with reference to the drawings.
The same reference numerals are used for the same or equivalent parts as in the conventional example.
In FIG. 1, a reference numeral 1 indicates a cylindrical case, and a first bearing 2 is provided at one end 1 a of the cylindrical case 1.
An annular stator 4 having a stator winding 3 is provided on the inner surface 1b of the cylindrical case 1, and a rear lid body 6 having a second bearing 5 is provided on the other end 1c of the cylindrical case 1. ing.

  An annular wall body 40 that projects inward, that is, toward the first bearing 2, is integrally formed at the axial center position of the rear lid body 6, and is axially formed on the inner wall 40 a of the annular wall body 40. A stator transformer 14 and a resolver stator 15 are provided along.

A rotary shaft 9 is rotatably provided between the bearings 2 and 5, and a rotor transformer 12 and a resolver rotor are arranged on a peripheral surface of the rotary shaft 9 corresponding to the stator transformer 14 and the resolver stator 15. 13, a rotary transformer 20 is formed by the stator transformer 14 and the rotor transformer 12, and a resolver 22 is formed by the resolver stator 15 and the resolver rotor 13.
The rotor transformer winding 12a of the rotor transformer 12 and the resolver rotor winding 13a of the resolver rotor 13 are connected by wiring (not shown) provided along the rotary shaft 9.

A rotor recess 21 formed inward along the axial direction is provided at one end of the rotor 8, and the annular wall body 30 is inserted into the rotor recess 21.
Therefore, the rotary transformer 20 and the resolver 22 are overlapped with the rotor 8 along the diameter direction orthogonal to the axial direction of the rotary shaft 9, so that the axial length of the entire motor can be shortened as compared with the conventional motor. .

Next, the configuration shown in FIG. 2 shows another embodiment of FIG. 1. The same parts as those in FIG. 1 are denoted by the same reference numerals, description thereof is omitted, and only the parts different from FIG. To do.
The second bearing 5 is provided at the tip of the annular wall 30 and is located inside the rotary transformer 20, that is, between the rotary transformer 20 and the first bearing 2.

It is sectional drawing which shows the brushless motor resolver structure by this invention. It is sectional drawing which shows the other form of FIG. It is sectional drawing which shows the conventional brushless motor resolver structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical case 1a One end 1b Inner surface 1c Other end 2 First bearing 3 Stator winding 4 Stator 5 Second bearing 6 Rear cover body 7 Magnet 8 Rotor 9 Rotating shaft 12 Rotor transformer 12a Rotor transformer winding 13 Resolver rotor 13a Resolver rotor Winding 14 Stator transformer 20 Rotating transformer 21 Rotor recess 22 Resolver 40 Ring-shaped wall

Claims (3)

A stator (4) provided on the inner surface (1b) of the cylindrical case (1) and having a stator winding (3), and a first bearing (2) provided at one end (1a) of the cylindrical case (1) And a rear lid body (6) having a second bearing (5) provided at the other end (1c) of the cylindrical case (1), and a rear lid body (6) integrally projecting inward. A ring-shaped wall body (30), a rotary shaft (9) rotatably provided in the cylindrical case (1) via the bearings (2, 5), and the rotary shaft (9). A rotor (8) provided with a magnet (7), a rotor recess (21) formed at one end (8a) of the rotor (8) into which the annular wall body (40) is inserted, and the annular wall body ( 40) a stator transformer (14) and a resolver stator (15) provided on the inner wall, and a rotor transformer provided on the peripheral surface of the rotating shaft (9) and corresponding to the stator transformer (14) and the resolver stator (15). (12) and a resolver rotor (13),
The stator transformer (14) and the rotor transformer (12) form a rotary transformer (20), the resolver stator (15) and the resolver rotor (13) form a resolver (22), and the rotary transformer (20) The brushless motor resolver structure is characterized in that the resolver (22) is superposed on the rotor (8) along the diameter direction of the rotor (8).   The brushless motor resolver structure according to claim 1, wherein the second bearing (5) is located outside the resolver (22).   The brushless motor resolver structure according to claim 1, wherein the second bearing (5) is located inside the rotary transformer (20).

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