JPH0815299A - Rotating direction discrimination device for electric motor - Google Patents

Abstract

PURPOSE:To discriminate the rotating direction of an electric motor with accuracy as well as with an ease, regardless of easy handling and simple constitution. CONSTITUTION:This rotating direction discrimination device for an electric motor is mounted on the rotation drive section 2 of an electric motor 1 and discriminates the rotating direction of the motor 1 via the start thereof. Also, the device has a barrel section 3 coaxially fitted to the rotation drive section 2 of the motor 1, a display member 4 fitted to the barrel section 3 in such state as capable of free oscillation, and a mounting member 5 for mounting and holding the section 3 on the drive section 2. In addition, the display member 4 is provided with a display section 6 having both normal and reverse indication sides corresponding to rotating directions, and displays the preset rotating direction on one side of the section 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating direction discriminating device for an electric motor.

[0002]

2. Description of the Related Art In order to determine the rotating direction of an electric motor, there is, for example, Japanese Patent Application Laid-Open No. 4-112649 proposed by the present applicant. This utilizes a hole such as a tap hole provided in the rotating part of the motor, and two detecting means (photoelectric sensors) corresponding to these are used to determine the rotation direction based on the leading and trailing of the detected signal. Is. In addition to this, it is also possible to determine the rotation direction using a strobe.
This is set in advance to the rated rotation speed or a blinking cycle with a slight difference in rotation speed, while the rotation drive section of the electric motor to which the strobe is irradiated is marked for this purpose. Is. Then, the electric motor is started while irradiating the strobe, and the rotation direction can be determined from the (apparent) moving direction of the marking.

[0003]

However, according to the former, while accurate rotation detection can be obtained, a hole is indispensable in the motor, and the positioning and setting by the two detecting means must be taken into consideration. , Such a series of operations is complicated. Further, according to the latter, the determination can be made only within the startup time from the start of the electric motor to the rated rotation speed, and once the rated rotation speed is reached, the determination becomes impossible.
Therefore, it is difficult to reliably discriminate the rotation direction with an electric motor having a short start-up time and a quick start-up.

The present invention has been made in view of the above problems existing in the prior art. The problem is that the handling is simple and the structure is simple and accurate. Another object of the present invention is to provide an electric motor rotation direction discriminating device capable of discriminating the rotation direction of an electric motor.

[0005]

In order to achieve the above object, the rotation direction discriminating apparatus for an electric motor of the present invention is provided by the following means. That is, a rotation direction discriminating apparatus for a motor, which is mounted on a rotation driving unit of an electric motor and discriminates a rotation direction by starting the electric motor, in which a body positioned coaxially with the rotation driving unit of the electric motor And a mounting member for mounting and holding the body portion on the rotation drive unit. The display member has two front and back surfaces corresponding to the rotation direction. Is provided, and one surface of the display member in the predetermined rotation direction is displayed on the display member by the rotation of the electric motor.

Further, in another rotating direction discriminating apparatus of the present invention, the stationary portion of the electric motor is mounted, and the rotating direction discriminating apparatus of the electric motor is arranged to discriminate the rotating direction by starting the electric motor. A support member mounted with a stationary portion and rotatably supported concentrically with the center of rotation of the electric motor;
The support member includes a cushioning member that suppresses rotation of the support member, and a detection unit that is connected to the cushioning member and that detects displacement of the cushioning member. The rotation of the electric motor causes the support member to rotate the electric motor. In response to a force reaction, a predetermined detection signal is output from the detection means in response to the displacement of the buffer member, and the predetermined rotation direction is determined by the detection signal.

[0007]

The rotating direction discriminating device of the present invention can be easily attached and held to the rotation driving portion of the electric motor to be discriminated by the mounting member. The display member is swingably provided on the body. Therefore, when the electric motor to be discriminated is started, the display member receives an action force so as to tilt toward the side opposite to the rotation direction by receiving the wind force associated with the rotation thereof. Since the display member is provided with two front and back display portions, one surface corresponding to the predetermined rotation direction is displayed on the display member due to this tilting, and the rotation direction can be easily discriminated.

Further, according to another rotation direction discriminating apparatus of the present invention, when the electric motor is mounted on the support member and the electric motor is started, a force opposite to the rotation is applied to the support member due to the reaction of the rotational force of the electric motor. Receive. The acting force caused by this causes the detection means connected to the buffer member to output a detection signal associated with the displacement. The detection direction allows the predetermined rotation direction to be easily determined.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor rotation direction discriminating apparatus according to the present invention will be described with reference to the following drawings. FIG.
[FIG. 3] is an overall perspective view showing a first embodiment. In FIG. 1, a member 1 is an electric motor, and a mounting flange 12
Further, the rotor 11 and the shaft 13 are rotatably supported. According to this embodiment, the rotor 11 and the shaft 13 which are rotatably supported by the flange 12 mean the rotary drive unit 2 according to the present invention. The electric motor 1 is fixed to another member by screwing into four holes formed in the flange 12.

Above the electric motor 1 in the figure, there is shown a rotation direction discriminating device 7 of the present invention. Rotation direction discriminating device 7
Is a suction cup 5 for fixing and holding the end face 10 of the rotor 11, which is the rotary drive unit 2, the body 3, and the support rods 15, 1.
5 and display units 6 and 6. The suction cup 5 is made of, for example, neoprene rubber and has a concentric circular shape. The suction cup 5 is pushed downward in the drawing (to the end surface 10 of the rotor 11) to expel the air therein, and is held and fixed to the rotor 11. The suction cup 5 forms the mounting member of the present invention.

Although not shown, the body 3 fixed to the suction cup 5 has a hollow interior, and is made of a synthetic resin material such as acetal copolymer or polyimide. The body 3 and the suction cup 5 are fixed by fitting. On the upper end side of the body 3, support bars 15, 15 are formed integrally so as to penetrate substantially perpendicularly to the body 3. The support bars 15 and 15 may be fitted by separate members or fixed by adhesion. Nonwoven fabrics 6, 6 made of a synthetic resin material such as polyester, polyethylene, polypropylene, etc. are attached to the respective support rods 15, 15 by fusion bonding. Each of them is swingably supported as shown by arrows.

The non-woven fabrics 6 and 6 are each formed in a substantially rectangular shape, and as shown in the drawing, a non-pattern (on the left side of the figure) and a mesh pattern (on the right side of the figure) are provided. With these patterns, the non-woven fabrics 6 and 6 serve as display portions in the rotating direction in the present invention. (Hereinafter, referred to as display units 6 and 6) Incidentally, on the back side of the display units 6 and 6, a display opposite to the front side display is made. (That is, the back surface on the left side of the figure is provided with a net-like pattern, and the back surface on the right side of the figure is unpatterned.) Then, the display portion 6 and the support bar 15 are the display members of the present invention. And eggplant

The display portions 6 and 6 are about 2 cm square and are thinly formed with a thickness of 0.3 mm. For this reason,
The absolute weight is set to 0.8 g, which is extremely light, and the support rod 15 is easily swung by the wind force of the rotation of the support rod 15. The order of use will be described below using the rotation direction determination device 7 of the present invention. As shown in FIG. 1, the suction cup 5 of the present device 7 is fixed to the electric motor 1 that determines the rotational direction. The suction cup 5 includes the axial center portion 14 of the rotor end surface 11 of the rotor 11.
, And are fixed concentrically (coaxially).
In this case, it is more preferable to have a positioning member and a positioning engagement portion for concentricity, but since the device 7 itself is lightweight and does not substantially affect the dynamic balance of the rotor 11, some deviation is caused. There is no particular problem.

Next, as shown in FIG. 2, when the required electric power is applied to the electric motor 1, the rotor 11 (shaft 13) of the electric motor 1 rotates. FIG. 2A shows a case of rotating clockwise as indicated by an arrow, in which case the display units 6, 6 are
Shows the unpatterned side. In addition, FIG. 2B shows a case where it is rotated counterclockwise as indicated by an arrow, and the mesh pattern side is displayed. Thus, by each rotation,
The display units 6 and 6 are affected by the wind force associated with the rotation, and the body 3
It becomes vertical with respect to. As a result, the direction of rotation can be easily determined.

In this case, if the normal rotation direction is the clockwise direction, it can be discriminated by the color (mesh pattern) only in the case of abnormality (FIG. 2B), and can be easily confirmed. Since the predetermined rotation direction is continuously displayed even after the rated rotation speed is reached from the start, it is possible to surely realize the error-free rotation direction determination. After the determination is completed, if the electric motor 1 is stopped, the suction cup 5 can be easily removed. As described above, the rotation direction discriminating apparatus 7 of the present invention is characterized in that the operation for discriminating the rotation direction is easy and the reliable discrimination can be easily performed.

Although the display portions 6 and 6 in the illustrated example are arranged symmetrically with respect to the body portion 180 by 180 degrees, three display portions may be provided at equal intervals of 120 degrees. Moreover, these increase and decrease can be set freely. It goes without saying that it is desirable to arrange these in consideration of the rotational movement balance of the discriminating device 7. It is also desirable to reduce the moment of inertia by making the material used for the display unit 6 as light as possible.

Next, FIG. 3 shows a second embodiment of the rotation direction discriminating apparatus of the present invention, and is an overall perspective view thereof. FIG.
In, the inverted cup-shaped member 21 forms the body.
The body portion 21 is formed of a synthetic resin material such as acetal copolymer. A pair of display members 22, 22 are provided on the upper end portion 25 of the body portion 21. Each of the display members 22 is swingably provided at the base portion 24 with respect to the body portion 21. That is, the display member 22 is attached to the root portion 24 in a hinge shape at the upper end portion 25, and a spring (coil spring) mounted inside (not shown) constantly keeps pointing upward (upper end portion 2).
(Substantially perpendicular to 5) is urged. Then, it is swingably supported by the wind force associated with the rotation of the body portion 21 as indicated by the arrow.

The peripheral wall 26 (mounting member) located below the body portion 21 has a shape corresponding to the outer dimensions of the rotor 20. A rubber ring 27 is attached to the lower end side of the peripheral wall 26 over the entire circumference, and serves as a cushioning member when the device is attached to the rotor 20 and a positioning member for concentrically positioning. The rubber ring 27 also serves to prevent the device from rotating. As is apparent from the figure, in this second embodiment, the rotor 20 is fixed so as to be externally fitted. Therefore, it can be easily mounted and, at the same time, is positioned concentrically. The rubber ring 27 can be formed of various synthetic resin materials other than neoprene rubber.

Thus, as the rotor 20 rotates,
The rotation direction can be easily and surely discriminated by the discriminating elements such as the patterns or colors displayed on the display portions 23, 23 of the display members 22, 22 as in the first embodiment. And even this series of operations can be easily executed.

In both the first and second embodiments described above, the direction of rotation mounted on the rotor of the electric motor is determined. However, this device should be mounted on the shaft side, which is the same rotary drive unit. You can also The following FIG. 4 shows an embodiment in which the present apparatus is mounted on the shaft side. Figure 4 (a)
Is the mounting member 3 on the cylindrical shaft 30 (round shaft).
FIG. 3 is a perspective view showing a state in which 2 is about to be attached. In the illustrated example, the mounting member 32 corresponds to the outer shape of the shaft 30,
The inside is a cylindrical void. A ring-shaped member 34 made of rubber or resin material is fitted and fixed in the opening. The members 32 and 34 may be integrally formed by two-color molding using a resin material. Ring-shaped member 3
4 has the same effect as the member 27 of the second embodiment.

Further, in FIG. 4B, the outer peripheral portion of the shaft 31 is knurled, and the inner peripheral portion of the mounting member 33 side corresponding to the shaft 31 is also knurled. . Since the mounting member 33 is formed of a resin material or the like, it is effective in terms of preventing vibration and preventing rotation, and is also effective in combination with knurling. 4 (a) and 4 (b), it is extremely easy to attach / detach this device and the shaft, and the troublesomeness is eliminated in performing a series of operations as in the above-described embodiments.

Further, in the embodiment shown in FIG. 5, a partial perspective view of another embodiment is shown in connection with the above-described mounting on the shaft. In FIG. 5, the attachment member 36 is provided with a chuck 38 so as to correspond to various outer diameter dimensions of the shaft 37. The chuck 38 is, for example, 3
The chucking diameter can be freely adjusted by screwing the screw member 39 forward or backward. Therefore, it is possible to determine the rotation direction of the electric motor having various shaft diameters.

Next, FIG. 6 is a perspective view showing still another embodiment according to the present invention. In the figure, a member 40 is an electric motor (a spindle motor is shown in the figure) whose rotational direction is to be determined, and is composed of a rotating portion 46 and a bracket (stationary portion) 47. Further, in the present device 48, a disk-shaped support base (support member) 41 is provided on a substantially rectangular base member 49. Support base 41
The inner peripheral portion 50 is formed corresponding to the bracket 47 of the electric motor 40, and is formed of, for example, an aluminum alloy.

On the inner peripheral edge of the support base 41, three pads 5 made of a synthetic resin material such as polyester or polyethylene are used.
1 is mounted, and when the electric motor 40 is fitted, the electric motor 1 is firmly held and is provided so as not to directly contact and damage the electric motor 40. The support base 41 is rotatably provided with respect to the base member 49 by a bearing 52 provided at a lower portion thereof, and its rotation center portion is concentrically aligned with the rotation center portion of the electric motor 40. It is set. When the electric motor 40 is mounted on the support base 41, the lead wire 54 is led out to the outside through the notch groove 53.

On the outer peripheral wall of the support base 41, an action rod 55 is provided which projects outward in the radial direction. Action rod 55
Is made of aluminum alloy or the like, and moves in the circumferential direction as the support base 41 rotates. Elastic members (cushioning members) 42 and 44 such as springs and rubbers are linearly provided in the radial direction on the tip end side of the action rod 55. Furthermore, on both sides of each elastic member 42, 44,
The support pieces 56, 57 are attached to the base member 49 (the mounting members 61,
(Via 62). Further, strain gauges (detection means) 43 and 45 are attached to the outer surfaces of the respective action pieces 56 and 57. Strain gauge 4
The output signals of 3, 45 are electrically connected to the circuit board 60 provided on the surface of the base member 49.

Therefore, the support base 41 in FIG. 6 is in a state in which its rotation is restricted by the elastic members 42 and 44. Next, a method of determining the rotation direction of the electric motor 40 in FIG. 6 will be described with reference to FIG. FIG. 7 is a plan view showing the action rod 55 and the elastic members 42 and 44 in an enlarged manner. FIG. 7A shows a state in which the electric motor 40 is stopped. Now, when the electric motor 40 is started by energizing it with a predetermined electric power, for example, when the rotating portion 46 rotates counterclockwise in FIG. 6, the reaction rod 55 at the start causes the action rod 55 to move as shown in FIG. 7B. It will be in a state.

Then, the elastic member 44 is compressed and the elastic member 42 is expanded. At that time, the action pieces 56 and 57 are acted so as to incline to the left in the figure, and the signals corresponding to the strain gauges 43 and 45 are output according to the deformation (displacement) thereof. If the signal output at this time is set to the rotation direction of the electric motor 40 or the counterclockwise direction, it can be easily discriminated.
On the contrary, when the rotation of the electric motor 40 is clockwise, it becomes as shown in FIG. 7C, and similarly, the rotation direction can be easily determined by the signal output of the strain gauges 43 and 45.

In the illustrated example, the strain gauges 43 and 45 are provided on the respective action pieces 56 and 57, but they may be provided on only one side. Further, the signal detection on only one side may be performed. A piezoelectric element can be used instead of these strain gauges. The elastic members 42 and 44 are
The elastic coefficient may be set according to the starting characteristics of the electric motor 40 and adjusted so as to obtain the optimum displacement. Also in the case of this embodiment, the electric motor 40 can be easily mounted, and the rotation direction can be reliably determined. The strain gauge 43,
The signal output from the detection means such as 45 is arbitrarily processed by various signal processing so that the lamp blinks or the buzzer sounds to easily determine the rotation direction. It goes without saying that you can do it.

The embodiment of the rotation direction discriminating device for the electric motor according to the present invention has been described above in detail, but the present invention is not limited to this and may be freely modified within the scope of the gist of the present invention. For example, it is possible to arbitrarily select the shape of the display member, the display method of the display unit, the mounting structure of the mounting member, and the like.

[0030]

The rotating direction discriminating apparatus for an electric motor according to the present invention is
Since it has the above-mentioned composition, it has the following effects. The rotation direction discriminating device of the present invention can be easily attached and held to the rotation drive unit of the electric motor to be discriminated by the mounting member, and the device can be easily attached and detached. Since the display member is provided so as to be swingable with respect to the body, it is possible to easily display the display by receiving the wind force associated with the rotation of the identified motor by starting it. Therefore, it is easy to handle, and the rotation direction of the electric motor can be accurately and easily determined with a simple configuration. In another embodiment, it can be easily mounted on a support (support member), and the rotation direction of the electric motor can be reliably determined by the detection signal of the detection means connected to the elastic (buffer) member.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire rotation direction discriminating apparatus for an electric motor according to a first embodiment of the present invention.

FIG. 2 is a perspective view of essential parts showing an operating state of the first embodiment shown in FIG.

FIG. 3 is a perspective view of an essential part showing an entire rotation direction discriminating apparatus for an electric motor according to a second embodiment of the present invention.

FIG. 4 is a partial perspective view according to another embodiment of the present invention,
Of these, (a) shows the case where a round shaft is used, and (b) shows the case where a knurled shaft is used.

FIG. 5 is a perspective view of a main part according to still another embodiment of the present invention.

FIG. 6 is an overall perspective view according to still another embodiment of the present invention.

7 is an enlarged plan view of an essential part showing an operating state of the embodiment of FIG. 6, in which FIG. 7 (a) shows a stopped state, and FIGS. 7 (b) and 7 (c) show an operating state.

[Explanation of symbols]

 2 Rotational drive part 3,21 Body part 4,22 Display member 5,32,33,36 Mounting member 6,23 Display part 10,20 Rotor 13,30,31,37 Shaft 15 Support rod 27 Rubber ring 38 Chuck 39 Screw Member 41 Support 42,44 Elastic member 47 Bracket 49 Base member 51 Pad 55 Action rod 56,57 Support piece

Claims (2)

[Claims] 1. A rotation direction discriminating device for a motor, which is mounted on a rotation driving portion of an electric motor and discriminates a rotation direction by starting the electric motor, comprising: a body portion coaxially positioned to the rotation driving portion of the electric motor. ,
The display member is provided so as to be swingable with respect to the body portion, and an attachment member for attaching and holding the body portion to the rotation drive portion. The display member has front and back surfaces corresponding to a rotation direction. A two-sided display unit is provided, the display member is swung by wind force due to the rotation of the electric motor, and by this swinging, the display member is one of the display units.
A rotation direction determination device for an electric motor, wherein one surface of a predetermined rotation direction is displayed. 2. A rotation direction discriminating apparatus for an electric motor, wherein the stationary portion of the electric motor is mounted and the rotational direction of the electric motor is discriminated by starting the electric motor. A support member that is rotatably supported in a concentric manner, a buffer member that suppresses rotation of the support member, and a detection unit that is connected to the buffer member and that detects displacement of the buffer member. Due to the rotational driving of the electric motor, the support member receives a reaction of the rotational force of the electric motor, and a predetermined detection signal is output from the detection means in response to the displacement of the buffer member, and the predetermined rotation direction is determined by the detection signal. A rotation direction discriminating device for an electric motor.