JPH06217497A - Motor with rotation detecting means - Google Patents

Abstract

PURPOSE:To provide a motor equipped with a rotation detecting means for detecting current position of window glass positively. CONSTITUTION:The motor 1 equipped with rotation detecting means comprises a magnetic plate 8 fixed onto a concentric circle of an output shaft with magnetized parts 8b, 8c having opposite polarities being arranged alternately at a plurality of points on a circle. Hall elements 11, each generating a pulse signal proportional to the r.p.m. of an output shaft 9 from the Hall voltage induced by the magnetic force of the magnetic plate 8, are arranged at a plurality of points on the magnetic plate 8 without contacting therewith. When the r.p.m. of the magnetic plate 8 is delivered in the form of pulse signal to a controller connected with external wiring 18-21, the controller can detects the position and the speed of window glass.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power window device for controlling the operation of a windshield by detecting the position and speed of the windshield of an automobile.
The present invention relates to a motor with rotation detecting means, which has means for moving the window glass up and down and detecting the position and speed of the window glass.

[0002]

2. Description of the Related Art Conventionally, as a power window device for controlling the operation of the windshield by detecting the position and speed of the windshield of an automobile, a device as shown in FIG. 5 is known. In FIG. 5, when the armature shaft 101 rotates, the rotation detecting means motor 100 transmits the rotation power of the armature shaft 101 to the worm wheel 102, and outputs the rotation power of the worm wheel 102 via the shock absorbing damper 104. It is transmitted to the shaft 105. A window glass 107 is connected to the output shaft 105 via a glass lifting mechanism 106, and the rotational power of the output shaft 105 is generated by the glass lifting mechanism 10.
By 6 the window glass 107 is converted into the fully closed side / fully opened side movement. The armature shaft 101 is provided with a rotation detecting means 108, and the rotation speed of the armature shaft 101 is converted into a pulse signal by the rotation detecting means 108 and transferred to the controller 109. Knows the position and velocity within the stroke. Wind glass 107
Is blocked before reaching the fully closed position, the controller 109 detects that the window glass 107 has stopped before reaching the fully closed position, and supplies current to the motor 100 with rotation detecting means. Is cut once, and then an electric current is supplied to move the window glass 107 toward the fully open side by a predetermined amount.

[0003]

In the above-described conventional motor with rotation detecting means 100, the rotation detecting means 108 recognizes the stroke from the fully closed state to the fully opened state of the window glass 107 according to the rotation speed of the armature shaft 101. When detecting the position and speed of the windshield 107, the armature shaft 101 to the output shaft 105
In the meantime, there is a possibility that a phase difference may occur due to the twist due to the elastic force of the damper 104, and even though the window glass 107 is stopped at the fully closed position due to this phase difference, the phase difference from the armature shaft 101 is reduced. When the rotation detecting means 108 detects that the rotation speed is before the fully closed position of the windshield 107, the controller 109 causes the windshield 107 to rotate.
Erroneously recognizes that the movement was blocked before the fully closed position, and once the current supply to the motor 100 with rotation detecting means is cut off, the window glass 107 is moved to the fully open side by a predetermined amount. There is a problem that it is difficult to operate the window glass 107 accurately, and it has been a problem to solve this problem.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a motor with rotation detecting means capable of reliably detecting the position and speed of a windshield.

[0005]

[Constitution of the invention]

[0006]

A motor with rotation detecting means according to the present invention comprises a worm provided on an armature shaft which is rotated by supply of an electric current, and a worm wheel which is rotatably supported by a gear case and meshes with the worm. A shock absorbing damper that is non-rotatably mounted on a concentric circle on one side of the worm wheel, an output shaft that is rotatably supported by the gear case, is fixed on the concentric circle of the damper, and is connected to a load, and an output shaft. Magnetic plates which are mounted on concentric circles and which have magnetic poles having opposite magnetic poles alternately arranged at a plurality of positions on the circumference, and a magnetic plate which is arranged in a magnetic field on the magnetic plate and is induced by a magnetic force from the magnetic plate. Hall elements that generate a pulse signal proportional to the number of rotations of the output shaft with Hall voltage are installed at multiple locations on the magnetic plate. In the embodiment adopted as necessary, the Hall elements are provided at a plurality of positions within the angular range of the same magnetic pole of the magnetic plate, and are adopted as necessary. In another embodiment, the Hall element is close to the magnetic plate via a sliding contact member that slidably contacts the magnetic plate, and in another embodiment adopted as necessary, the Hall element is connected to the outside and A grommet to which an elastic leaf spring-like connecting member is attached is provided, and the Hall element is
It is biased toward the magnetic plate by the elastic force of the leaf spring-like connecting member in a state of being electrically connected to the leaf spring-like connecting member via the circuit board.

[0007]

In the motor with rotation detecting means according to the present invention, the magnetic plates mounted on the concentric circles of the output shaft and having magnetized portions having opposite magnetic poles alternately arranged at a plurality of positions on the circumference of the output shaft. A rotating magnetic field is generated by rotating together with it, and a pulse signal proportional to the rotational speed of the output shaft is generated by the Hall voltage induced by the Hall element by this rotating magnetic field, so rotation is detected based on the rotational speed of the output shaft. . Therefore, the phase difference caused by the twist of the damper does not occur as compared with the case where the rotation is detected by the rotation speed of the armature shaft.

[0008]

1 to 4 show one embodiment of a motor with rotation detecting means according to the present invention.

In the illustrated motor 1 with rotation detecting means, one of the armature shafts 3 rotatably accommodated in the motor case 2 projects to the gear case 4 side, and the armature shaft 3 has a protruding portion to the gear case 4. Has a worm 5. Armature shaft 3
Is provided in an armature (not shown) in the motor case 2, and the armature rotates forward / reversely when supplied with a current from a controller (not shown).

A worm wheel 6 meshes with the worm 5 in the gear case 4. Worm wheel 6
The center hole 6a is rotatably supported by the output shaft support portion 4a provided in the gear case 4 as an annular shape at the substantially center thereof, and a shock is applied to a damper mounting hole 6b formed on one side of the worm wheel 6. The absorption damper 7 is non-rotatably fitted. The damper 7 is provided with a damper hub 7b made of metal at the center of an elastic portion 7a having some elasticity, and an oval hole 7c is formed on the concentric circle of the worm wheel 6 at the center of the damper hub 7b. The oval hole 7c is non-rotatably attached to the output shaft 9 described later.

A magnetic plate 8 is arranged above the worm wheel 6. The magnetic plate 8 has a disk shape having an outer diameter slightly smaller than the outer diameter of the worm wheel 6, and an S pole magnetized portion 8b in which an S pole is magnetized on the outer periphery of a base 8a provided at the center. And this S pole magnetizing part 8
N pole magnetized portion 8c in which the N pole which is a magnetic pole opposite to b is magnetized
And 6 are alternately arranged on the circumference. An oval-shaped hole 8d is also formed in the center of the base 8a similarly to the damper 7, and the oval-shaped hole 8d is non-rotatably attached to the output shaft 9 described later. The single S-pole magnetized portion 8b and the single N-pole magnetized portion 8c are in the same angular range on the circumference of the magnetic plate 8.

On the other hand, an output shaft 9 is rotatably inserted through an output shaft support portion 4a provided on the gear case 4,
One side of the output shaft 9 is connected to a glass elevating mechanism (not shown) outside the gear case 4, and the other side projects into the gear case 4. Output shaft 9 gear case 4
The protruding portion inside is provided with an oval-shaped shaft portion 9a for locking a damper, which is formed to have an outer shape to be inserted into an oval-shaped hole 7c formed in the damper hub 7b of the damper 7. Above the locking oval shaft portion 9a, there is provided a magnetic plate locking oval shaft portion 9b formed to have an outer shape to be inserted into an oval hole 8d formed in the base 8a of the magnetic plate 8. A pin mounting groove 9c is provided above the oval shaft 9b for locking the magnetic plate. In the output shaft 9, an oval shaft portion 9a for locking a damper is inserted into an oval hole 7c of the damper 7 on the inner peripheral side of the worm wheel 6, and an oval shaft portion 9 for locking a magnetic plate is provided above the worm wheel 6.
Since b is inserted into the oval hole 8d of the magnetic plate 8 and the seam (C) type pin 10 for retaining is fitted in the pin mounting groove 9c on the upper side of the magnetic plate 8, the damper 7 and the magnetic plate 8 is integrally locked.

On the other hand, the Hall element 1 is provided on the magnetic plate 8.
1 is arranged in three places. The Hall element 11 is shown in FIG.
As is clear from the above, the external connection line 11 is fixed to the lower side of the circuit board 13 in a ring shape and wrapped in a sliding contact member 12 formed of Teflon resin.
a, 11b, and 11c are electrically connected to one end side of the leaf spring-like connecting members 14, 15, and 16 on the upper side of the circuit board 13. The hall element 11 is housed in the gear case 4 and covered by the gear case cover 17. The other ends of the leaf spring-like connecting members 14, 15 and 16 are fixed to the grommet 18 and connected to external wirings 19, 20 and 21, respectively. The external wires 19, 20, 21 are connected to a controller (not shown). Leaf spring-like connecting member 14,
Since 15 and 16 have some elasticity toward the magnetic plate 8 side which is a direction orthogonal to the longitudinal direction and the side opposite to the magnetic plate 8, the sliding contact member 12 contacts the magnetic plate 8. In the contacted state, the Hall element 11 is urged in the magnetic field of the magnetic plate 8 to the side closer to the S pole magnetized portion 8b and the N pole magnetized portion 8c. Since the sliding contact member 12 contacts the magnetic plate 8, the Hall element 11 does not directly contact the magnetic plate 8.

Since the Hall element 11 is biased to the side of the magnetic plate 8 that approaches the S-pole magnetized portion 8b and the N-pole magnetized portion 8c, the Hall voltage is generated by the rotating magnetic field generated when the magnetic plate 8 rotates. Induce. Since the Hall voltage repeats low level and high level each time the pair of S-pole magnetized portions 8b and N-pole magnetized portions 8c pass by the rotation of the magnetic plate 8, the Hall voltage is connected to the external wiring 19, 20, 21. The controller detects the position and speed of the windshield by transmitting the rotation speed of the magnetic plate 8 to the controller as a pulse signal.

As is apparent from FIGS. 3 and 4, the magnetic plate 8 has an S-pole magnetized portion 8b and an N-pole magnetized portion 8b.
c and 4 pairs are provided, and a single S of the magnetic plate 8 is provided.
The angle range of the pole magnetized portion 8b (N pole magnetized portion 8c) is θ,
When arranging the hall elements 11 at n positions, if the first hall element 11 is arranged at the S1 position on one end of the angular range θ of the S pole magnetized portion 8b, the mth hall element 11
The position of Since n is 3 when the Hall elements 11 are arranged at three positions, the first element is arranged at the S1 position, and The second one is placed at the position S2 having the angular range of
From position The third one is arranged at the S3 position having the angle range of.

Thus, the Hall voltage induced by the first, second, and third Hall elements 11 is high while the Hall voltage induced by the first Hall element 11 is at a high level. Since the second and third Hall elements 11 are set to the high level via the respective equal intervals, the resolution of rotation detection by the Hall elements 11 is subdivided, and the accuracy can be improved.

In the motor 1 with rotation detecting means having such a structure, when the window raising / lowering switch is turned on to the close side when the window glass connected to the glass raising / lowering mechanism is in the fully open position, the armature shaft 3 is moved. Since the armature shaft 3 rotates in the normal direction, the worm wheel 6 meshing with the armature shaft 3 starts to rotate in the normal direction. When the worm wheel 6 rotates forward, the damper 7 also rotates forward integrally with the worm wheel 6. Therefore, the rotational power of the worm wheel 6 is transmitted to the output shaft 9 through the damper 7, so that the output shaft 9 is positive. Rotate. When the output shaft 9 rotates forward, the glass lifting mechanism (see FIG. 5) connected to the output shaft 9 on the outside of the gear case 4 is operated, so that the window glass (see FIG. 5) is moved toward the closing side. .

At the same time that the output shaft 9 starts to rotate in the forward direction, the magnetic plate 8 also starts to rotate integrally with the output shaft 9, so that a rotating magnetic field is generated, and the rotating magnetic field causes the Hall elements 11, 11, 11 to move to the Hall elements. Induces voltage and transfers it to the controller. The controller is each hall element 11,1
Output shaft 9 by counting Hall voltage from 1 and 11 respectively
The position and speed of the windshield are recognized by detecting the number of rotations of.

When a foreign object is caught on the side where the windshield moves and the movement of the windshield is blocked,
The controller that detects the stroke of the window glass by the Hall voltage from the Hall elements 11, 11, 11 is
It recognizes that the count has disappeared even though the wind glass has not reached the stroke end, and stops supplying the current and supplies the current in the direction opposite to the moving direction of the wind glass. After stopping, it will start moving toward the fully open side.

During this time, the Hall elements 11, 11, 11 are
Since the rotational speed of the output shaft 9 is detected within the rotating magnetic field of the magnetic plate 8 that rotates integrally with the output shaft 9 without the damper 7, the position of the output shaft 9 and the magnetic plate 8 due to the twist of the damper 7 is detected. Since the phase difference does not occur, the fluctuation of the rotation speed of the output shaft 9 can be detected without delay.

[0021]

As described above, since the motor with rotation detecting means according to the present invention has the above-mentioned structure, it is compared with the conventional motor which detects rotation by the rotation speed of the armature shaft. Since the rotation is detected without generating the phase difference caused by the twisting of the damper, the position and speed of the windshield can be reliably detected, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is an external view showing an assembling relationship of respective parts of an embodiment of a motor with rotation detecting means according to the present invention.

FIG. 2 is a vertical sectional side view of a rotation detecting portion in the motor with rotation detecting means shown in FIG.

FIG. 3 is a specific positional relationship explanatory diagram of a rotation detecting portion in the motor with rotation detecting means shown in FIG.

FIG. 4 is an output waveform diagram in the rotation detecting portion shown in FIG.

FIG. 5 is a configuration diagram of a conventional motor with rotation detecting means.

[Explanation of symbols]

 1 Motor with rotation detecting means 3 Armature shaft 4 Gear case 5 Worm 6 Worm wheel 7 Damper 8 Magnetic plate 8b, 8c S pole magnetized part, N pole magnetized part 9 Output shaft 11 Hall element

Claims (4)

[Claims] 1. A worm provided on an armature shaft that rotates by the supply of electric current, a worm wheel rotatably supported by a gear case and meshing with the worm, and a non-rotatably mounted on one side concentric circle of the worm wheel. A shock absorbing damper, an output shaft rotatably supported by the gear case, fixed on a concentric circle of the damper, and connected to a load, and magnetic poles mounted on the concentric circle of the output shaft and opposite to each other. A magnetic plate in which magnetized portions having are alternately arranged at a plurality of locations on the circumference, and a Hall voltage arranged in a magnetic field on the magnetic plate and induced by a magnetic force from the magnetic plate, the number of rotations of the output shaft. Hall elements that generate a pulse signal proportional to are arranged at a plurality of locations on the magnetic plate. Motor with that rotation detection means. 2. The motor with rotation detecting means according to claim 1, wherein a plurality of Hall elements are provided within an angular range of the same magnetic pole of the magnetic plate. 3. The motor with rotation detecting means according to claim 1, wherein the hall element is close to the magnetic plate through a sliding contact member that is in sliding contact with the magnetic plate. 4. The gear case is provided with a grommet which is connected to the outside and to which an elastic leaf spring-like connecting member is attached, and the Hall element is electrically connected to the leaf spring-like connecting member via a circuit board. The motor with rotation detecting means according to claim 1, wherein the motor is biased toward the magnetic plate side by the elastic force of the leaf spring-like connecting member in the opened state.