JPS5825757Y2 - Rotational drive amount control device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotational drive amount control device using a DC motor that can arbitrarily extract a desired amount of rotational driving force in both forward and reverse directions. The object is to obtain rotational driving force in any forward or reverse direction depending on the operating direction of the knob, and to obtain a rotational driving amount corresponding to the amount of rotation of the knob.

Another object of the present invention is to efficiently and easily assemble a potentiometer part that sets and regulates the amount of rotation together with a volume into a reduction gear.

Various types of devices are used to set and control the direction and amount of rotation of an arbitrary rotating object, but most of the conventional devices of this type have no rotation in the device itself, which is the rotation drive source. There is no ability to set the direction of rotation or amount of rotation, and in most cases the direction and amount of rotation are set and limited by the movement of the rotating object itself.

In other words, in this type of conventional device, a single switch operation applies a rotational driving force to a rotating object until the rotating object reaches its operating limit. When this reaches, for example, a limit switch installed on the side of the rotating object detects that the rotating object has reached its rotation limit and stops the rotating drive device by operating the limit switch. In most cases, the direction of the rotational force of this rotational drive device is reversed.

For this reason, in conventional devices of this kind, the direction and amount of rotation cannot be freely set, which naturally limits the scope of use, and the device can only be used for simple opening/closing control.

Further, as an improved type of the above-mentioned rotary drive device, there is one that is provided with a reversing switch and a start switch on the device side and has a pointer that moves in accordance with the movement of the rotary object.

In this device, a reversing switch sets the rotating direction of the rotating object, and a starting switch moves the rotating object in a desired direction.

The operation of this rotating object is made known to the operator by the rotation of a pointer that is mechanically connected directly to the rotating object (through a flexible wire, etc.), and the pointer rotates a predetermined number of times. When the amount of rotation is reached, the starting switch can be turned off to stop the rotating object at the desired amount of rotation.

This device is quite convenient because it allows you to freely set the amount and direction of rotation of the rotating object, and in fact it is used in many places, but the switch operation is cumbersome. In addition, the operation panel and the machine or rotating object must be directly connected by mechanical means such as flexible wires, which complicates the mechanical configuration and makes maintenance and management troublesome. It is inappropriate to control a large number of rotating objects using a dynamic drive source, and it is necessary to stay at the location, monitor, and operate switches until the rotating object completes a predetermined amount of rotational movement. There were some inconveniences such as not being able to do so.

The best mechanism currently in use for controlling the motion of any rotating object is a servo motor mechanism that combines an AC motor and a synchro electric machine.

This servo motor mechanism can be operated by one switch operation.
The direction and amount of rotation can be freely set, the operation is reliable and accurate, there is no need to directly connect the operating unit and the rotation object, and the rotation object can be set as desired. This is the best device of its kind, as it automatically stops when it has been rotated by the specified amount.

However, this servo motor mechanism is very expensive, so it is uneconomical to use it in large numbers, and because it is relatively large, it is not suitable for controlling the motion of small rotating objects or in narrow spaces. there were.

Furthermore, since the configuration is relatively complex, a certain degree of specialized knowledge is required for handling, maintenance, and management.

As described above, the servo motor mechanism, which has traditionally been considered to be an excellent rotation control device for rotating objects, has various drawbacks, but it does not require particularly high control ability and only requires large torque. The above-mentioned servo motor mechanism has the drawback of being too expensive for controlling the motion of a rotating object that only needs to be obtained.

The present invention was devised to eliminate the drawbacks and dissatisfied points in the conventional example described above, and includes an inexpensive DC motor, a reduction gear, a potentiometer section assembled to this reduction gear,
It is composed of a bridge circuit having the resistor of the potentiometer section as one bridge side, and a control circuit section that sets the direction of rotation of the DC motor according to the polarity of the output voltage value from the bridge circuit.

Embodiments of the present invention will be described below with reference to the drawings.

The rotational drive amount control device according to the present invention includes a DC motor 1,
A reducer 2 directly connected to the DC motor 1, a potentiometer section 10 attached to the reducer 2 with the output shaft 9 of the reducer 2 as a rotation axis, and a potentiometer section 10.
A Wheatstone bridge circuit is formed from the resistor 12, one variable resistor VR, and two fixed resistors R1 and R2 of the same value. Specifically, in the case of the illustrated embodiment, only when there is a difference between the addition/subtraction value between the output voltage value of the bridge circuit section 33 and the reference voltage value and the reference voltage value, the output voltage of the two output terminals 42 is It is comprised of a control circuit unit 34 that outputs an output signal to either one, and a polarity switching unit 35 that sets the polarity connection of the DC motor 1 to the DC power source E according to the output from the control circuit unit 34.

(See Figures 1 to 3 below) The size of the DC motor 1 is not particularly limited, but since the rotational force is extracted through the reducer 2, its output torque is extremely large. Therefore, in a normal case, a small DC motor (common for use in automobiles) using a 24 (V) power supply or a 12 (V) power supply may be used.

The reducer 2 is directly connected to the DC motor 1, and in the illustrated embodiment, the first stage worm gear 4 (see FIG. 2) attached to the motor shaft of the DC motor 1 is engaged with the worm wheel 5. Worm gear 7 fixed to gear shaft 6 with worm wheel 5 attached (see Figure 3)
is constructed by meshing with the final worm wheel 8 fixed to the output shaft 9.

This final stage worm wheel 8 has a relatively large flat disc shape and is housed in a gear case 3 together with the worm gears 4, 7° worm wheel 8 and gear shaft 6. It is fixed at 1.

The potentiometer unit 10 is assembled on the worm wheel 8 with the output shaft 9 as the center. A ring-shaped resistor 12 and a conductor 13 are arranged and fixed concentrically around the output shaft 9, and one end of this resistor 12 is connected to the conductor 13 by an appropriate means, and the resistor 12 is slid onto the resistor 12. The movable contact 14 and the sliding contact 15 are in constant contact with the conductive wire body 13, respectively.

Both sliding contacts 14 and 15 are fixed to a printed circuit board 25 fixed to the gear case 3, and connected to the printed circuit board 2 by printed wirings 26 and 29 of this printed circuit board 25.
It is led to the terminal section of 5.

That is, this potentiometer 10 changes the contact position of the sliding contactor 14 to the resistor 12 by the operation of the DC motor 1, that is, by the rotation of the worm wheel 8, and the contact position of the sliding contactor 14 with the resistor 12 changes. By changing the length of the resistor 12 from the position to the end short-circuited to the conductor 13, a change in resistance value proportional to the amount of rotation of the output shaft 9 is outputted.

Resistor 12 configuring this potentiometer section 10
is electrically drawn out from the combination of the DC motor 1 and the speed reducer 2 through the printed wiring 26 and 29, and is connected to the Wheatstone by the variable resistor VR, which is a volume, and the fixed resistors R1 and R2, which have two equal resistance values. A bridge circuit is formed to constitute a bridge circuit section 33 (see FIG. 4).

The output terminal of this bridge circuit section 33 is connected to a control circuit section 34 which outputs an output signal to either of two output terminals 42 depending on the polarity of the output voltage value from this bridge circuit section 33.

That is, in the case of the illustrated embodiment, the control circuit section 34 compares the addition/subtraction value between the output voltage value from the bridge circuit section 33 and the reference voltage value and the reference voltage value, and determines whether the output voltage value and the reference voltage value are the same. When there is a difference between the addition/subtraction value and the reference voltage value, an output signal is output to one of two output terminals 42 depending on the magnitude relationship.

Although the control circuit section 34 operates as described above, various configurations can be considered as the circuit configuration of the control circuit section 34 that performs such electrical operations.

That is, the basic configuration of the control circuit section 34 is to compare the addition/subtraction value of the output voltage value from the bridge circuit section 33 and the reference voltage value with the reference voltage value, and calculate the addition/subtraction value between the output voltage value and the reference voltage value. and a comparison calculation circuit section that outputs an output with a polarity depending on the magnitude relationship between and a reference voltage value, and a kind of switch circuit section that outputs an output signal to a set output terminal according to the output from this comparison calculation circuit section. It will be configured.

(See FIG. 4 below) In the illustrated embodiment, the amplifier AM1 receiving the output voltage from the bridge circuit section 33 is connected to the resistor r
3. r4. r5. r6. A differential amplifier circuit is configured by r7 and capacitor C, and a reference voltage obtained from the voltage dividing point of voltage dividing resistors r1r2, for example, 9 [■] is inputted to the positive terminal, and the output voltage from the bridge circuit section 33 is The value obtained by adding and subtracting the value and the reference voltage value is outputted.

The voltage dividing point of the reference voltage setting resistors r11 and r2 is directly connected to the negative terminal of the amplifier AM2 via the resistor r9, and is further divided between the resistors r15 and r16, so that the voltage is slightly smaller than 9 [■]. low value, e.g. 8.9(V)
It is connected to the positive terminal of the amplifier AM3 via a resistor r12 in a state where it is set at a certain level.

On the other hand, the output of the amplifier AM1 is connected to the plus terminal of the amplifier AM2 via a resistor r8, and to the minus terminal of the amplifier AM3 via a resistor r1□.

When the output of amplifier AM1 exceeds 9 [■], amplifier AM
2, an output is generated at the transistor T r which has a resistor rll as a base resistor via a resistor rlO.
1, turns on this transistor Tr1, and connects the output terminal I, which is connected to the collector of this transistor Tr1 via the diode D1, to the negative pole of the DC power supply E.

At this time, the input to the negative terminal of the amplifier AM3 has a higher voltage, so no output is produced.

Conversely, the output of amplifier AM1 is 8 as the reference voltage.
．． When it becomes smaller than 9 (V), this output is connected to the resistor r17.
An output signal from the amplifier AM3 is generated through the resistor r13, and is inputted to the base of the transistor Tr2 having a resistor r14 as a base resistor, turning on the transistor Tr2.

When the transistor Tr2 is turned on, the output terminal is connected to the negative pole of the DC power supply E via the diode D2 and the transistor Tr2.

In this way, the control circuit section 34 connects either of the two output terminals to the DC power supply E depending on the polarity of the output voltage value from the bridge circuit section 33.

In other words, the operation output signal is output to either of the two output terminals 42.

A polarity switching unit 35 that switches the connection polarity of the DC motor 1 to the DC power source E according to the output signal from the control circuit unit 34
The relays RL1. RL2, and both relays RL1. RL2
Relay switch R81 operated by changeover switch,
R82 is arranged so that each terminal of the DC motor 1 can be switched and connected to the positive pole side and the negative pole side of the DC power supply E.

In the illustrated embodiment, each relay switch R81°R82 is connected to a relay RL1 . As long as RL2 is not energized, the terminal of DC motor 1 is connected to the negative terminal of DC power supply E, and only when relay RL1 or RL2 is activated, the terminal of DC motor 1 is connected to the negative pole of DC power supply E. It is designed to be connected to the positive pole side.

Therefore, both relays RL1. RL2 does not operate at the same time, and only one of them always operates, so one of the race switches R8 is connected to the DC power supply
When connected to the positive pole of the DC power supply E, the other remains connected to the negative pole of the DC power source E, and the DC motor 1 rotates in the corresponding direction.

Since the device of the present invention has the above-described configuration, when the bridge circuit section 33 is in balance, the output voltage from the bridge circuit section 33 becomes zero, so both output terminals of the control circuit section 34 No output is output to the port, and therefore the DC motor 1 remains cut off from the DC power source E and does not operate.

Now, if variable resistor VR is adjusted from the above state to a value larger than resistor 12, the output voltage of amplifier AM1 will become larger than the reference voltage (for example, 9 (V)), and amplifier AM
2 to generate an output to operate relay RL1, and turn relay switch R81 to the positive pole side of DC power supply E to rotate DC motor 1 in the forward direction.

As the DC motor 1 rotates in the forward direction, the output shaft 9 also rotates in the forward direction to generate torque, which rotationally drives a suitable rotating object (not shown).

According to the rotation of the output shaft 9, the base plate 11 fixed to the worm wheel 8 also rotates.
2 increases in proportion to the amount of rotation of the output shaft 9.

When the resistance value of the resistor 12 increases in proportion to the amount of rotation of the output shaft 9 and becomes equal to the value of the variable resistor VR, the bridge circuit section 33 returns to an equilibrium state, and therefore the relay RL is cut off from the DC power supply E. Similarly, the connection of the DC motor 1 to the DC power source E is cut off, and the DC motor 1 is stopped.

Conversely, if variable resistor VR is adjusted to a value smaller than resistor 12, an output smaller than the reference voltage value of 8, 9 (V) will be generated from amplifier AM1, and amplifier AM3 will output an output to this. out and activate relay RL2.

The operation of relay RL2 causes relay switch R82 to fall to the positive side, connecting DC motor 1 to DC power supply E in the reverse direction, and causing DC motor 1 to rotate in reverse.

This reverse rotation of the DC motor 1 causes the output shaft 9 to rotate in the opposite direction, and at the same time, the resistance value of the resistor 12 of the potentiometer section 10 decreases in proportion to the amount of rotation of the output shaft 9.

When the rotation of the output shaft 9 progresses and the resistance value of the resistor 12 decreases together with this rotation until it becomes equal to the set value of the variable resistor VR, at that rotation position, the DC power source E of the DC motor 1 The DC motor 1 is stopped by cutting off the connection to the DC motor 1.

In other words, the variable resistor VR uses a general volume, and if the resistance change of the variable resistor VR is set to be directly proportional to the amount of rotation of its knob, the bridge circuit section 33 will be in an equilibrium state. From a certain position, variable resistance V
When the knob R is rotated by a desired amount and the resistance value of the variable resistor VR is changed by a resistance value proportional to the amount of rotation of this knob, the output shaft 9 changes an amount according to the amount of rotation of the knob in this variable resistor VR. It will rotate and stop there.

Therefore, the amount and direction of rotation of the output shaft 9 can be freely set by the variable resistor VR.

In this way, with the device of the present invention, the direction and amount of rotation of the rotational driving force can be freely set with a single knob operation of the variable resistor VR.
In many cases, it is convenient to combine the variable resistor VR with a variety of rotatable objects without limitation and place it integrally. For example, by placing it on a control panel or the like, a rotating object can be easily controlled remotely.

Note that the circuit components other than the variable resistor VR salt, that is, the constant resistors R1 and R2, the control circuit section 34, and the changeover switch section 35 are combined into one control section as shown in FIG. It is convenient to attach the motor 37 to the combination of the DC motor 1 and the speed reducer 2.

In addition, examples of rotating objects that are rotationally driven by the device of the present invention include dampers such as smoke dampers and switching dampers, valves, outlet angle adjustment, outdoor blinds, TV camera drives, and lighting. Appliance drive, skylight opening/closing,
Many possible applications are possible, such as outdoor louver, fan coil outlet position switching, etc.

The device of the present invention can obtain a rotational driving force in a desired rotational direction and a desired rotational amount simply by operating the knob of the volume, which is a variable resistance VR, and can easily and relatively accurately operate a rotating object. can be controlled.

In addition, since its structure is based on a combination of a DC motor 1 and a speed reducer 2, the structure is simple and can be extremely small, making it easy to manufacture.
It can be manufactured at low cost and can be easily installed even in places where installation space is extremely limited.

As is clear from the above description, the present invention can arbitrarily and easily control the amount and direction of rotation of all kinds of rotating objects, and since the drive source is the DC motor 1, If there is a suitable DC power source E such as, installation is not limited at all to the location, it can be used freely in a car, for example, and its basic configuration is a DC motor 1 and a speed reducer 2. Since it is a combination with the above, it is easy to manufacture and has many excellent effects as an equal rotational drive amount control device that can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the main body of the device of the present invention, FIG. 2 is a partially cutaway plan view with the lid of the gear case removed, and FIG. 3 is a longitudinal sectional front view of the speed reducer. FIG. 4 is an electrical circuit diagram showing an example of electrical connections of the device of the present invention. Explanation of symbols, 1; DC motor, 2; Reducer, 3; Gear case, 4, 7; Worm gear, 5, 8; Worm wheel, 6; Gear shaft, 9; Output shaft, 10; Potentiometer section, 11; Base plate , 12; Resistor, 13; Conductor, 14, 15; Sliding contact, 25 Niblint board, 3
3 nibridge circuit section, 34; control circuit section, 35; polarity switching section, ■R; variable resistor, Rt, R2' fixed resistor, A
, Ml. AM2, AM3; amplifier, Trl, Tr2; transistor, Dl, D2; diode, rl, r2r3
Tsu r4 ν r5 Fur r6 Tsu r7. rB ν
r9 tsu rlo? r11 +r12 +r13 +
r14 tr15 +r16' resistance, RLl, RL2
; Relay, R81, R82; Lil switch, E: DC power supply.

Claims (2)

[Scope of utility model registration request] (1) A DC motor 1, a reducer 2 directly connected to the DC motor 1, a potentiometer section 10 attached to the reducer 2 with the output shaft 9 of the reducer 2 as a rotation axis, and the potentiometer section 10. of the resistor 12, one variable resistor VR, and two fixed resistors R1 and R2 of equal value.
a bridge circuit section 33 that forms a Wheatstone bridge circuit; a control circuit section 34 that outputs an output to either of two output terminals 42 depending on the polarity of the output voltage value from the bridge circuit section 33; and a polarity switching section 35 that switches the polarity of connection of the DC motor 1 to the DC power supply E according to the output from the control circuit section 34. (2) A base plate 11 which is an electrical insulator is fixed to the worm wheel 8 of the reducer 2 fixed to the output shaft 9, and a resistor 12 is placed concentrically on the upper surface of the base plate 11 with the output shaft 9 as the center. and a conductor 13 are arranged and fixed in a ring shape, one end of the resistor 12 is connected to the conductor 13, and sliding contacts 14 and 15 are always in contact with the resistor 12 and the conductor 13 to form a potentiometer section. 10. The rotational drive amount control device shown in claim (1) of the utility model registration.