JP4046303B2 - Vacuum motor structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum motor structure, and in particular, by providing a magnetic gear on a rotor and a magnetic sensor body on a motor case, a light source, an encoder disk, and a light receiving element disposed on the vacuum side are unnecessary, and the structure is simplified and The present invention relates to a new improvement for improving reliability.
[0002]
[Prior art]
Conventionally, as this type of vacuum motor structure, a configuration incorporating an optical encoder shown in FIG. 3 has been adopted. That is, what is indicated by reference numeral 1 in FIG. 3 is a rotor that is rotatably provided via a bearing 21 on a motor case 20 having a stator 2 composed of a stator core 2a and a stator winding 2b. A connector 7 is provided through an O-ring 8 in a mounting hole 20a formed in a part of the mounting hole 20a. A rotor magnet 10 is provided on the outer periphery of the rotor 1.
[0003]
In the motor case 20, the light source 5 and the light receiving element 6 are fixedly disposed so as to be separated from each other and face each other, and an encoder disk 4 is provided at an end 1 a of the rotor 1. Is located between the light source 5 and the light receiving element 6.
Therefore, the rotor 1, the light source 5, the encoder disk 4, and the light receiving element 6 described above are located on the vacuum side, and the stator 2 is located on the atmosphere side by the partition wall 3 integrated with the motor case 20. The light source 5, the light receiving element 6, and the encoder disk 4 constitute an optical rotation detector 40.
[0004]
[Problems to be solved by the invention]
Since the conventional vacuum motor structure is configured as described above, the following problems exist. That is, since the built-in encoder is an optical type, a partition wall cannot be provided between the light source and the light receiving element, and the lead wires of the light source and the light receiving element must be drawn to the outside through the connector. It is difficult to maintain the vacuum side inside the connector and the air side outside the connector completely from the viewpoint of the structure of the connector, which has been a bottleneck when using a vacuum motor.
[0005]
The present invention has been made to solve the above-described problems, and in particular, by providing a magnetic gear on the rotor and a magnetic sensor body on the motor case, the light source, encoder disk, and light receiving disposed on the vacuum side. It is an object of the present invention to provide a vacuum motor structure that eliminates the need for an element and simplifies the structure and improves reliability.
[0006]
[Means for Solving the Problems]
The vacuum motor structure according to the present invention has a rotor that can rotate freely through a bearing in a motor case having a stator, and a detector rotor of a rotation detector is provided on the rotor, and the rotor and the detector rotor are on the vacuum side. position and location, before Symbol detector rotor comprises a magnetic gear which is formed of a magnetic material, wherein the motor case magnetic sensor body is provided in correspondence with the magnetic gear, the inner ends of the magnetic sensor body vacuum side , in a vacuum motor structure outer end which is to be located on the atmosphere side of the magnetic sensor element, the pre-Symbol magnetic sensor element, a cover whole has a flange portion forms a cup-shaped, is provided in said cover front A printed circuit board having a magnetic sensor, a biasing magnet provided on the back side of the printed circuit board, and a resin filler filled in the cover for holding the printed circuit board Ri, the flange portion is fixed to the outer surface of the motor case, a configuration in which the inner end of the cover is positioned inside the motor case.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of a vacuum motor structure according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals.
A reference numeral 1 in FIG. 1 denotes a rotor that is rotatably provided via a bearing 21 on a motor case 20 having a stator 2 composed of a stator core 2a and a stator winding 2b. The magnetic sensor body 11 is tightly fixed to the mounting hole 20 a formed in the portion via the O-ring 8.
[0008]
A rotor magnet 10 is provided on the outer periphery of the rotor 1, and a magnetic gear 12 made of a magnetic material and serving as a detector rotor is provided on the outer periphery of the end 1 a of the rotor 1. The magnetic sensor body 11 is positioned to face the gear 12a of the magnetic gear 12. The magnetic gear 12 and the magnetic sensor body 11 constitute a magnetic rotation detector 40.
[0009]
The magnetic sensor body 11 is configured as shown in FIG. 2, and forms a cup shape of the magnetic sensor body 11 and has a step portion 11Bb on the inner end 11Ba side of the cover 11B having the flange portion 11A on the front side. A printed board 11b having a known magnetic sensor 11a is provided, and a bias magnet 11c is provided on the back side of the printed board 11b. The cover 11B is filled with a resin filler 11e, and the printed board 11b is held on the stepped portion 11Bb by the resin filler 11e.
Therefore, the inner end 11Ba of the magnetic sensor body 11 is positioned inside the motor case 20, and the stator 2 is positioned on the atmosphere side by the partition wall 3 that is an extension of the motor case 20.
[0010]
With the above-described configuration, the rotor 1, the magnetic gear 12, and the inner end 11Ba of the magnetic sensor body 11 are located on the vacuum side, and the outer end 11Bc of the stator 2 and the magnetic sensor body 11 are located on the atmosphere side. In addition, the lead wire 30 connected to the printed circuit board 11b provided with the magnetic sensor 11a is led out to the outside through the resin filler 11e.
Further, the internal structure of the magnetic sensor body 11 described above is merely an example of the configuration shown in FIG. 2, and other known sensor structures can be used.
[0011]
【The invention's effect】
Since the vacuum motor structure according to the present invention is configured as described above, the following effects can be obtained. That is, by changing the encoder built in the vacuum motor from the conventional optical type to the magnetic type, the motor case only has to be directly provided, there is no leakage from the vacuum side to the atmosphere side, and the vacuum side Wiring is not necessary, and the structure can be simplified and the reliability can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a vacuum motor structure according to the present invention.
FIG. 2 is an enlarged cross-sectional view showing the magnetic sensor body of FIG.
FIG. 3 is a cross-sectional view showing a conventional vacuum motor structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor 2 Stator 12 Detector rotor (magnetic gear)
11 magnetic sensor body 11Ba inner end 11Bc outer end 11A collar 11B cover 11a magnetic sensor 11b printed circuit board 11e resin filler 20 motor case

Claims (1)

A motor case (20) having a stator (2) has a rotor (1) rotatably via a bearing (21), and the rotor (1) has a detector rotor (12) of a rotation detector (40). provided, wherein located in the vacuum side of the rotor (1) and the detector rotor (12), before Symbol detector rotor (12) is made of a magnetic gear which is formed of a magnetic material, said motor case (20) A magnetic sensor body (11) is provided corresponding to the magnetic gear (12), the inner end (11Ba) of the magnetic sensor body (11) is on the vacuum side, and the outer end (11Bc) of the magnetic sensor body (11). ) in vacuum motor structure configured to be positioned on the atmosphere side, before Symbol magnetic sensor element (11) includes a cover (11B) which overall have the flange portion forms a cup-type (11A), said cover ( 11B) a printed circuit board (11b) having a magnetic sensor (11a) on the front side, a bias magnet (11c) provided on the back side of the printed circuit board (11b), and filling the cover (11B) Before It is made of a resin filler (11e) for holding the printed circuit board (11b), and the flange (11A) is fixed to the outer surface side of the motor case (20), and the inner side of the cover (11B) vacuum motor structure you characterized in that the end (11Ba) is located inside of the motor case (20).

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