JPH04134194U - Motor control device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a motor control device that can detect the fully closed/open state of a valve without increasing the number of signal lines between the motor and control equipment. [Structure] A motor that has a limit switch circuit that cuts off the supplied current when the valve opening reaches a fully closed or fully open state, and that drives the valve in the direction of closing or opening the valve, and this motor. a switch circuit that selectively turns on either a close switch or an open switch depending on the driving direction of the switch;
The motor is equipped with a control device having a current detection circuit for detecting the current value supplied to the motor. The present invention is characterized in that after the switch circuit is turned on, the operation of the limit switch circuit is indirectly detected using a current detection circuit.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is for example valve opening control and damper opening control used in fields such as air conditioning. The present invention relates to a motor control device for a commercial motor.

0002

[Conventional technology]

FIG. 4 is an explanatory diagram of a conventional motor and control equipment for driving a small electric valve. Motor 1 0 has a capacitor motor and a switch SW connected in series with the capacitor motor. Switch SW is a limit switch for fully closed/open, and the valve opening is fully closed/open. When the contact is turned off by the switch drive cam, the torque applied to the valve reaches the rated value. This prevents the valve from being destroyed by exceeding it. In addition, it moves in parallel with the switch drive cam. By providing an additional mechanism and circuit to control the valve opening status, it becomes possible to send the valve opening status to the outside. . The control equipment 20 side has AC 24V power for operation of the motor 10 and a closed circuit. Select either a close switch that indicates the direction or an open switch that indicates the open direction. The switch circuit 22 is turned on at a certain time. Then, the switch circuit 22 closes/opens the switch. The motor 10 is controlled by turning on one of the switches.

0003 However, on the control device 20 side, the valve position information is not obtained, and it is conveniently I was waiting for a predetermined amount of time to pass. That is, from fully closed to fully open the motor 10 in advance. Check the operating time of the valve, execute full close or full open control for more than this operating time, and make sure the valve is fully closed. /Control was being executed assuming that the valve was in the open position.

0004

[Problem that the idea aims to solve]

However, as in humidification control, it is essential to detect the fully closed state for control purposes. In this case, add a separate fully closed/open limit switch to control valve status detection. I was using the control device 20. Figure 5 is a configuration diagram of a conventional device with a fully closed/open detection function. It is. The motor 10 is provided with a fully closed/open state contact SW1, and the control device 20 is fully closed/opened. A limit input circuit 24 is installed, and three signal lines are used to connect the two. Figure 6 is a configuration diagram of another conventional device, in which proportional control of the cold/hot water valve is achieved by controlling using cold/hot water. An example of how to do this is shown below. Fully close/open limit switch on motor 10 A resistor input circuit 26 is installed in the control device 20. There are three signal lines connecting the two. Using potentiometer PT Proportional control can be performed with

[0005] However, providing an additional circuit inside the motor 10 in this way reduces equipment costs. The increase in the number of signal wires will lead to an increase in the number of signal lines, which is difficult to install when installing inside a building, such as for air conditioning. The problem was that it made things complicated. The present invention solves these problems and improves the communication between the motor 10 and the control equipment 20. A motor control device that can detect the fully closed/open state of a valve without increasing the number of lines. The purpose is to provide.

[0006]

[Means to solve the problem]

The present invention, which achieves these objectives, is designed to prevent the valve opening from reaching the fully closed or fully open state. When the valve is closed, it has a limit switch circuit that cuts off the supplied current. or a motor that drives in the opening direction, and a close switch depending on the driving direction of this motor. Alternatively, a switch circuit that selectively turns on one of the open switches and a switch circuit provided for this motor. and a control device having a current detection circuit that detects the supplied current value. So After the switch circuit is turned on, current detection is performed to confirm that the limit switch circuit has operated. It is characterized by indirect detection using an output circuit.

[0007]

[Effect]

Each component of the present invention operates as follows. When the switch circuit is turned on, the motor will Opens and closes the valve opening in the specified direction. In the limit switch circuit, the valve is fully closed/open. When this happens, stop driving the motor. The current detection circuit monitors the drive current and resets the drive current. Indirectly detects the operation of the mitt switch circuit. This allows limit switch times. There is no need to provide a signal line between the motor and the control equipment to detect the movement of the road.

[0008]

【Example】

The present invention will be explained below using the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In addition, in Figure 1, the above Components that have the same functions as those in FIG. 3 are given the same reference numerals and their explanations will be omitted. In the figure, the electric The current detection circuit 28 is provided between the switch circuit 22 and the power supply circuit, and is The current supplied to the controller 10 is measured. For example, the gate current of a triac is It is detected or measured using a non-contact method using a Hall element.

[0009] The operation of the device configured in this manner will be described next. Turn on the switch circuit 22 Then, the motor 10 opens and closes the valve opening in the specified direction. limit switch circuit The SW stops driving the motor 10 when the valve is fully closed/opened. current detection The circuit 28 monitors the drive current and turns off the drive current when the limit switch circuit SW is turned off. Since no dynamic current flows, it is possible to detect whether the valve is fully closed or open. Wear. For example, it is possible to measure the time from fully closed to fully open. The opening/closing time of the switch circuit 22 is determined appropriately using the operating time of the switch circuit 22. Proportional control can be performed by Furthermore, since the end of control can be detected, Control time can be shortened and multiple motors can be controlled in a time-sharing manner using a single control device 20. It is also easy to do.

0010 FIG. 2 is a configuration block diagram of an example in which the present invention is applied to an air conditioning system. In the diagram The symbol is as follows. CC...Cold water coil CW…cold water FC...Fan coil controller FCU…Fan coil unit HC…Hot water coil HE…Hygrometer HW…Hot water MV…Electric valve (motor valve) RA…Return air SA…Air supply TE…Thermometer Here, electric valves MV1 and MV2 correspond to the motor 10, and the fan coil controller The FC corresponds to the control device 20. Control depends on whether it is heating or cooling. Then, sequentially control either the hot water or cold water valve using speed proportional control or time ratio control. Example control is performed. Therefore, the uncontrolled valve must be fully closed. , valve position information is required. Therefore, the current detection circuit 28 confirms that it is fully closed. Ru. In addition, regarding speed proportional/time proportional control, the operation required from fully closed to fully open. Time is measured appropriately to ensure smoother control.

[0011] FIG. 3 is a configuration block diagram of an example in which the present invention is applied to another air conditioning system. figure The symbols different from those described in FIG. 2 are as follows. OA…Outside air SP1...Filter clogging detector SS...Steam SVO…Electric valve control equipment (motor valve controller) The control device SVO controls the valve opening degrees of electric valves MV1 to MV3 to exchange heat with the air supply SA. The amount of cold water, hot water, and steam to be used is determined. There is also a separate temperature and humidity controller. , input the measurement signals from the thermometer TE and hygrometer HE, and move in the direction to achieve the set temperature and humidity. Send a control signal to the control device SVO. The control device SVO is connected to an external collection via a communication line. It is connected to the middle monitoring device and sends and receives valve opening signals, etc.

0012 The motor is for proportional control, but the value of the potentiometer is constant. Therefore, management based on operating time is required to confirm the fully closed/open position. There The current detection circuit 28 detects the fully closed/open state. Also here, the control equipment Since the SVO uses the power capacity of one motorized valve MV to control three motorized valves, each In order to shorten the control time, time-sharing control is performed by detecting the fully closed/open state. .

[0013]

[Effect of the idea]

As explained above, according to the present invention, the current detection circuit 28 is provided in the control device 20. , since it is indirectly detected that the valve opening of the motor 10 is fully closed/open, The motor and control equipment can be connected with fewer signal lines, making construction easier. At the same time, manufacturing costs are also reduced. Also, cold and hot water that requires sequential control. If this invention is applied to a system that uses This makes control and construction easier.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing an embodiment of the present invention.

FIG. 2 is a configuration block diagram of an example in which the present invention is applied to an air conditioning system.

FIG. 3 is a configuration block diagram of another example in which the present invention is applied to an air conditioning system.

FIG. 4 is an explanatory diagram of a conventional motor and control equipment for driving a small electric valve.

FIG. 5 is a configuration diagram of a conventional device having a fully closed/open detection function.

FIG. 6 is a configuration diagram of another conventional device.

[Explanation of symbols]

10...Motor 20...Control equipment 22...Switch circuit 28...Current detection circuit SW…Limit switch circuit

Claims (1)

[Scope of utility model registration request] 1. A motor that has a limit switch circuit that cuts off the supplied current when the valve opening reaches a fully closed or fully open state, and that drives the valve in the direction of closing or opening the valve; - a switch circuit that selectively turns on either a close switch or an open switch depending on the direction in which the motor is driven;
A control device having a current detection circuit that detects the current value supplied to the motor, and indirectly detects, using the current detection circuit, that the limit switch circuit has operated after the switch circuit has been turned on. A motor control device characterized by: