JP2002174269A - Driving device of electric actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device having a simple configuration and capable of being assembled into a spring return type electric actuator and a non-spring type electric actuator in common and using a form of control from the outside in common. SOLUTION: A motor driving circuit used in the spring return type electric actuator and the non-spring type electric actuator in common and a clutch driving circuit driving an electromagnetic clutch are provided independently from each other, and these circuit parts are mounted on the same circuit wiring board to use the spring return type and non-spring type electric actuators in common. Moreover, a connection terminal connected to a motor of the electric actuators and a connection terminal connected to the electromagnetic clutch are provided independently from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for an electric actuator which can be commonly used for a spring return type electric actuator and a non-spring type electric actuator.

[0002]

2. Related Background Art Electric actuators for driving air-conditioning control valves and the like are roughly classified into a spring return type and a non-spring type. Incidentally, the spring-return type electric actuator generally includes a spring that applies a return force to an actuator mechanism driven by a motor, and selectively transmits the torque of the motor to a gear mechanism that drives the actuator mechanism. To provide an electromagnetic clutch. Then, by operating the electromagnetic clutch, the motor and the gear mechanism are connected to transmit the motor torque to the actuator mechanism, thereby driving the actuator mechanism against the spring, and stopping the operation of the electromagnetic clutch. Then, the motor and the gear mechanism are separated from each other, and the actuator mechanism is returned to the original state by using the elastic return force of the spring. In particular, this type of spring-return type electric actuator is used in applications where it is necessary to return a control valve or the like to an initial predetermined state, for example, a shut-off state or a fully-open state, when an unpowered state such as a power failure occurs.

On the other hand, a non-spring type electric actuator does not include the above-described spring and electric clutch, and drives the actuator mechanism by directly transmitting the torque of the motor to the actuator mechanism via a gear mechanism. It is configured to return to the original state. This type of non-spring return type electric actuator is used for applications in which it is not necessary to return a control valve or the like to an initial predetermined state, for example, a shut-off state or a fully-open state, even when a power supply state such as a power failure occurs.

[0004]

As described above, the spring return type and non-spring type electric actuators have different driving modes, and therefore, the configuration itself of the driving device built in (built into) the electric actuator is also different. ing. However, in practice, the drive device is shared, including the configuration of the power supply terminal and the external control terminal, and depending on whether it is a spring return type electric actuator or a non-spring type electric actuator, for example. If the electric actuator can be driven simply by changing the control mode of the driving device,
The convenience can be greatly improved. Also, for the side that manufactures the electric actuator, since the components including the drive device can be shared, there is an advantage that the manufacturing cost can be reduced.

However, in the case of the spring return type electric actuator, a non-spring mechanism is required in order to check the operating state of the electric clutch and control its operation, for example, a function of detecting the presence or absence of power supply and its detection terminal are required. A function not found in the electric actuator of the type is required. Therefore, it is difficult to share the drive device.

The present invention has been made in view of such circumstances, and has as its object to be able to be incorporated in spring return type and non-spring type electric actuators in common, and to provide a form of external control. It is another object of the present invention to provide a drive device having a simple configuration that can be shared.

[0007]

In order to achieve the above object, a drive device for an electric actuator according to the present invention comprises a control circuit section commonly used in a spring return type electric actuator and a non-spring type electric actuator, And from a control circuit unit used only in the non-spring type electric actuator, a clutch drive circuit unit for driving the electromagnetic clutch is configured independently, and these circuit units are mounted on the same circuit board, so that a spring is provided. It is characterized in that the return type and the non-spring type electric actuator are shared.

Preferably, a connecting terminal portion provided on a circuit board on which the respective circuit portions are mounted is connected to a connecting terminal portion connected to a motor of an electric actuator.
It is characterized in that it is provided separately from a connection terminal connected to the electromagnetic clutch, and the connection terminal for the electromagnetic clutch is used only in the case of a spring return type electric actuator.

According to a third aspect of the present invention, an external connection terminal block provided on a circuit board on which the respective circuit units are mounted and to which an external power supply and a controller are connected is shared by the respective circuit units. It is characterized by being provided. Further, regardless of whether the actuator is a spring return type electric actuator or a non-spring type electric actuator, it is characterized in that the electric actuator can be commonly driven and controlled from the outside.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a driving device for an electric actuator according to an embodiment of the present invention. FIG. 1 is a diagram showing a schematic configuration of a drive device according to this embodiment. SR is a spring return type electric actuator to be driven, and NS is a non-spring type electric actuator. The spring return type electric actuator SR includes the motor M, the electromagnetic clutch C, the gear mechanism G, and the spring unit S as described above, and is configured to rotationally drive the output shaft A of the actuator mechanism in the forward and reverse directions. The non-spring type electric actuator NS includes a motor M and a gear mechanism G, and is configured to rotationally drive the output shaft A of the actuator mechanism in the forward and reverse directions. The gear mechanisms G of the electric actuators SR and NS each include a detector D for detecting the operation angle (rotation angle) of the output shaft A.

The electric actuator S is incorporated in a spring return type electric actuator SR or a non-spring type electric actuator NS.
A driving device 10 for driving R and NS is configured by mounting a motor driving circuit 12 for driving the motor M and a clutch driving circuit 13 for driving the electric clutch C on a printed circuit board 11 having a predetermined size. You. The clutch drive circuit 13 is connected to the electric actuator S as described later.
This is realized as a device having a power supply detection function for detecting whether or not a drive power supply for driving R and NS is applied to the printed circuit board 11.

In particular, the drive device 10 includes a control circuit section commonly used in the electric actuators SR and NS and the non-spring type electric actuator in order to use the electric actuators SR and NS as they are. The control circuit unit used only in the NS, specifically, the motor drive circuit 12 that drives the motor M, and the control circuit unit used only in the spring return type electric actuator SR, specifically, drives the electromagnetic clutch C The clutch drive circuit 13 is configured to be independent of the drive circuits 12 and 13 so as not to interfere with each other.

A motor drive circuit commonly used in the electric actuators SR and NS is a motor M
, The actuator mechanism, for example, a control valve is opened and closed, or stopped at an intermediate position by stopping and driving the actuator. Incidentally, in the spring return type electric actuator SR, the torque transmission path between the motor M and the gear mechanism G is disconnected by opening the electromagnetic clutch C when the power is turned off,
The elastic return force of the spring unit S acts on the actuator mechanism to close the control valve. That is, the control circuit unit (control function) used only in the spring return type electric actuator SR has a function of controlling the operation of the electromagnetic clutch C not provided in the non-spring type electric actuator NS.

The motor drive circuit 12 basically controls the energization of the motor M under the control of an external control device (controller) 20, thereby playing the role of driving the motor M. The clutch drive circuit 13 plays a role of energizing the electromagnetic clutch C on condition that power for driving the motor M is input. Therefore, the clutch drive circuit 13 incorporates a power detection function for detecting whether or not power for driving the motor M is input as described above.

In order to control the operation of the motor M by the motor drive circuit 12, the printed circuit board 11 has a dedicated connection terminal (for electrically connecting the motor drive circuit 12 and the motor M). 14m). In order to control the operation of the electromagnetic clutch C by the clutch control circuit 13, a dedicated connection terminal (connector) 14c for electrically connecting the clutch drive circuit 13 and the electromagnetic clutch C is provided. In addition, the printed circuit board 11 receives the operation angle (rotation angle) of the output shaft A detected by the detector D into the drive device 10 or outputs the operation angle to the control device 20 described above. Connection terminal (connector) 1 for making an electrical connection with the detector D
4d are provided. Each of these connection terminals (connector)
14m, 14c, and 14d are mounted on the printed circuit board 11 independently of each other so as to clearly distinguish their roles.

By the way, the above-mentioned driving device 10 uses, for example, a 100-230 V commercial power supply (AC) 21 or electric power that has been converted in voltage via a transformer as its driving source. It drives the actuators SR and NS. The commercial power supply 21 and the controller 2 are connected via the external connection terminal block 15.
Externally connected to 0. The external connection terminal block 15 is, for example, of a seven-terminal type, and has first and second terminals a,
“b” is used as a power supply terminal for the clutch drive circuit 13. The second to fourth terminals b, c, and d serve as power supply terminals for the motor drive circuit 12,
Further, the fifth to seventh terminals e, f, and g are provided with information indicating the operation angle (rotation angle) of the output shaft A detected via the connection terminal portion (connector) 14d described above. 20 is used as a terminal for outputting the signal.

In particular, the second to seventh terminals b, c, to g
The drive target of the drive device 10 is used regardless of whether it is a spring return type electric actuator SR or a non-spring type electric actuator NS. ) Side power supply line is connected. And third and fourth
The terminals c and d are connected to a hot-side power supply line of the AC power supply 21 via a normal rotation control switch SW1 and a reverse rotation control switch SW2 incorporated in the control device (controller) 20, respectively. When the switches SW1 and SW2 are selectively turned on (ON), an AC voltage is applied from the AC power supply 21 between the terminals b and c or between the terminals b and d, whereby the motor drive circuit 12 operates. It has become something. From the fifth to seventh terminals e, f, and g, the control device (controller) 20 is connected.
In response, information indicating the operation angle (rotation angle) of the output shaft A is output.

On the other hand, the first terminal a is used only when the object to be driven by the driving device 10 is a spring return type electric actuator SR. Side power line is connected. Since the cold (ground) side power supply line of the AC power supply 21 is connected to the second terminal b as described above, the first and second terminals a and b are thereby connected.
During this time, an AC voltage is applied from the AC power supply 21 to operate the clutch drive circuit 13. In other words, the drive target of the drive device 10 is the non-spring type electric actuator NS, and the first terminal a
When the hot power supply line of the AC power supply 21 is not connected to the AC power supply 21, the AC power supply 2 is connected between the first and second terminals a and b.
1 is not applied, and the clutch drive circuit 13 does not operate because it does not receive power supply. In this case, since the non-spring type electric actuator NS does not include the electromagnetic clutch C, the connection between the connection terminal portion (connector) 14c and the electric actuator is naturally not performed.

Thus, according to the drive circuit 10 configured as described above, regardless of whether the object to be driven is the spring return type electric actuator SR or the non-spring type electric actuator NS, the electric actuator RS , NS, and if it is determined whether or not to connect the AC power supply 21 to the first terminal a according to the type thereof, whether or not to operate the clutch drive circuit 13 is thereby selected from outside. be able to. In the case of the spring return type electric actuator SR, the motor M can be driven by the motor drive circuit 12 in a state where the electromagnetic clutch C is operated by the clutch drive circuit 13, and the non-spring type electric actuator NS In the case, the motor drive circuit 1
It is possible to drive the motor M by operating only 2.

As described above, the hot-side power supply line of the AC power supply 21 is connected to the third and fourth terminals c and d controlled by the switches SW1 and SW2 using the first terminal a of the external connection terminal block 15. In parallel, the clutch drive circuit 13 can reliably detect the power supply input regardless of the ON / OFF state of the switches SW1 and SW2. Therefore, the electromagnetic clutch C in the spring return type electric actuator SR can be reliably operated.

In the above-described embodiment, the driving device 1
AC power is applied to the first terminal a depending on whether the electric actuator in which the electric actuator 0 is incorporated is a spring return type (SR) or a non-spring type (NS). It is configured to selectively determine whether to operate the drive circuit 13. However, as a form of control of the electric actuator, an AC power supply is always applied to the drive device 10,
There is also a method of controlling the driving of the electric actuator by giving a control signal for controlling the operation from a control device (controller) 20.

For such a control system, the driving device 30 may be configured as shown in, for example, FIG. 2 showing a second embodiment. That is, the driving device 30 is provided with a predetermined printed circuit board 31 similarly to the above-described embodiment.
Above, a control circuit unit commonly used in the electric actuators SR and NS, specifically, a motor drive circuit 32 for driving the motor M, and a control circuit unit used only in the spring return type electric actuator SR Specifically, a clutch drive circuit 33 for driving the electromagnetic clutch C is provided independently. An internal power supply circuit 34 for generating a predetermined internal power supply from a power supply voltage supplied to the clutch drive circuit 33 is provided so that these drive circuits 32 and 33 do not interfere with each other. Using the motor drive circuit 32
Alternatively, the control circuit 35 for controlling the operation of the motor drive circuit 32 is configured to be driven. Then, a control signal given from the control device (controller) 20 is input to a control circuit 35, and the control circuit 35 controls the operation of the motor drive circuit 32.

In this case, information on the operation angle (rotation angle) of the output shaft A detected by the detector D may be given to the control circuit 35. As the external connection terminal block 36 provided on the printed circuit board 31,
A terminal for supplying power from the AC power supply 21 to the clutch driving circuit 33 and the motor driving circuit 32 of the driving circuit 30 and a terminal for inputting a control signal from the control device (controller) 20 are collectively provided. It is sufficient to use a four-terminal type provided.

The driving device 3 thus constructed
According to 0, the clutch drive circuit 33 and the electromagnetic actuator are integrated depending on whether the electric actuator in which the drive device 30 is incorporated is of a spring return type (SR) or a non-spring type (NS). The electrical connection with the clutch C may be made. Rather, since the non-spring type electric actuator NS does not include the electromagnetic clutch C in the first place, the connection of the signal line to the connection terminal (connector) 14c which is the output of the clutch drive circuit 33 is omitted, and the clutch drive is performed. The output of the circuit 33 can be invalidated.

Therefore, irrespective of whether the actuator is a spring return type electric actuator SR or a non-spring type electric actuator NS, if the driving device 30 having the above configuration is incorporated, the electric actuators SR and NS are externally provided. The AC power supply 21 and the control device (controller) are connected to the external connection terminal block 36 regardless of the type of the power supply.
20 can be connected to drive the electric actuators SR and NS in exactly the same control procedure.

In the spring return type electric actuator SR, a sufficient holding torque for the elastic return force of the spring unit S can be obtained as the motor M even when power is not applied.
For example, it is preferable to use a synchronous motor. If such a synchronous motor is used, the state holding force can be obtained even after the actuator mechanism is driven. Therefore, for example, a brake circuit or the like is not required, and the configuration of the driving devices 10 and 30 is accordingly reduced. Simplification can be achieved.

As a drive source for the electric actuators SR and NS, the AC power source 2 of 100 to 230 V described above is used.
When 1 is used, a ground terminal may be required for safety measures. As a countermeasure against noise when a control signal from the control device 20 is input, it may be necessary to shield the signal line and ground the shielded line. Such a grounding terminal (earth terminal) may be prepared in advance in the external connection terminal blocks 15 and 36 described above, and the number of terminals including the grounding terminal may be used. It cannot be denied that the size increases. Moreover, the printed circuit board 1 on which the external connection terminal blocks 15 and 36 are provided
1 and 31 become larger and electric actuators SR and NS
However, there is a problem that the space for installing the driving devices 10 and 30 in the above-mentioned method becomes large.

Therefore, in order to avoid such inconvenience and to provide a ground terminal if necessary, for example, FIGS. 3 and 4 show a structure in which the driving devices 10 and 30 are incorporated into the electric actuators SR and NS. The printed circuit boards 11 and 3 of the driving devices 10 and 30 are mounted on a housing 40 made of conductive members of the electric actuators SR and NS.
The printed circuit boards 11 and 31 are directly fixed on the boss 41 using conductive (metal) screws 42, and the driving devices 10 and 3 are formed.
0 is connected to the housing 40. In this case, land patterns 4 connected to the ground lines of the driving devices 10 and 30 are provided around the screw holes in the printed circuit boards 11 and 31.
If 5 is formed, the ground line can be directly connected to the housing 40 by fixing with the screw 42.

Then, the driving device 10,
For example, a screw hole 43 and a screw 44 to be screwed into the screw hole 43 are provided on the side where the external connection terminal blocks 15 and 36 are positioned in 30. , The shield line of the control signal line is connected to the housing 40. The screw hole 43
May be provided by utilizing the empty area of the cable connection portion in the housing 40.

Thus, if such a structure is adopted, the AC power source 2 may be changed depending on the specifications of the electric actuators SR and NS.
Even if it becomes necessary to provide a ground wire or a shield wire for the control signal wire for the control signal line 1, the ground wire and the shield wire can be connected to the driving devices 10 and 30 via the housing 40. A large number of external connection terminal blocks 15,
There is an effect that there is no need to replace the C.36. In other words, there is no need to change the configuration of the drive devices 10 and 30 according to the specifications, and the drive devices 10 and 30 can be commonly used for various electric actuators SR and NS. The following effects can be obtained.

The present invention is not limited to the above embodiment. For example, the layout of the motor drive circuits 12, 32 and the clutch drive circuits 13, 33 on the printed circuit boards 11, 31, etc., may be arranged so that these circuits do not interfere with each other. The arrangement of the connection terminals (connectors) 14m, 14c, and 14d may be set so that their functions can be identified.
Further, here, the electric actuators SR and NS having the angle detector D have been described as an example, but the present invention is similarly applicable to the electric actuators SR and NS when the angle detector D is not provided. In this case, it goes without saying that the connection terminal (connector) 14d for making connection to the angle detector D is not required. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0032]

As described above, according to the present invention, a drive device used for a spring return type electric actuator or a non-spring type electric actuator can be used in common, and its driving object is a spring return type electric actuator. Regardless of whether it is an electric actuator or a non-spring type electric actuator, the drive device can be operated from the outside by a common control procedure. Moreover, the configuration can be simplified, the number of components can be reduced, and the handling thereof can be facilitated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a drive circuit of an electric actuator according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a drive circuit of an electric actuator according to a second embodiment of the present invention.

FIG. 3 is a plan view showing a mounting structure of a driving device to the electric actuator.

FIG. 4 is a sectional view showing a mounting structure of a driving device to the electric actuator.

[Explanation of symbols]

 SR Spring return type electric actuator NS Non-spring type electric actuator M Motor C Electromagnetic clutch G Gear mechanism S Spring unit D Detector A Actuator mechanism output shaft 10,30 Driving device 11,31 Printed circuit board 12,32 Motor drive Circuit 13, 33 Clutch drive circuit 14m, 14c, 14d Connection terminal (connector) 20 Controller (controller) 21 AC power supply

Claims (3)

[Claims] An electric actuator of a spring return type, comprising: a spring for applying a return force to an actuator mechanism, transmitting torque of the motor to the actuator mechanism via an electromagnetic clutch to drive the actuator mechanism, and torque of the motor. Is directly used in a non-spring type electric actuator that directly transmits the actuator mechanism to the actuator mechanism to drive the actuator mechanism, and is commonly used in the spring return type electric actuator and the non-spring type electric actuator. And a control circuit unit used only in the non-spring type electric actuator, a clutch drive circuit unit for driving the electromagnetic clutch is configured independently, and these circuit units are formed in the same circuit. Drive of the electric actuator characterized by comprising mounted on a substrate. 2. The driving device for an electric actuator according to claim 1, wherein the circuit board on which the circuit units are mounted is connected to a connection terminal unit connected to a motor of the electric actuator and the electromagnetic clutch. A driving device for an electric actuator in which connection terminals are provided independently of each other. 3. The driving device for an electric actuator according to claim 1, wherein the circuit board on which the circuit units are mounted has an external connection terminal block to which a power supply and a controller are connected, common to the circuit units. A driving device for an electric actuator, comprising: