JP2978710B2 - State detection circuit for drive unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric circuit for detecting a state of a driving device using an electric motor. In particular, the state detection circuit according to the present invention accurately detects what kind of driving state or what kind of stop state the driving device is in, and turns on an indicator light to indicate the operation state of the driving circuit, or It is suitable for use when operating other control circuits.
The above-described motor drive device is used, for example, for raising and lowering a sunshade (awning), a screen, a shutter, and the like installed on a window, a glass door, a skylight, an entrance, or the like of a building.

[0002]

2. Description of the Related Art As shown in an explanatory view of FIG. 3A, a drive unit 10 includes a switch unit 12 having a limit switch, a motor 14 having a thermostat, a brake 16, and a reduction gear 18, which will be described later. It is housed in a tube 19. One end of a rotating shaft 24 of the motor 14 is fixed to a rotating force transmitting member 22. The driving device 10
The rotating force transmitting member 2 is installed in the winding pipe 20.
2 is fixed to the winding pipe 20 by a suitable fixing means (such as a screw) 23. One end of the winding pipe 20 is fixed to a disk-shaped member 21, which is supported by a shaft 25 b via a bearing. The other end of the winding pipe is fixed to a bearing 8, and the bearing 8 is rotatably attached to a fixing member 25a. Therefore, when the motor 14 rotates, the winding pipe 20 rotates via the rotating shaft 24 and the rotational force transmitting unit 22. As will be described later, since the motor 14 can rotate in the forward and reverse directions, the pipe 20 rotates in the direction of the arrow 26 or 27. Although it is not clear from FIG.
Is transmitted to the limit switch section 12 via the bearing 8 fixed to the pipe 20. The driving device 10
Although connected to a power supply (usually a commercial power supply of 100 V or 200 V), the connection between the drive device 10 and the power supply is omitted in FIG.

FIG. 3B shows a take-up pipe 20 in which the driving device 10 is housed, and a screen 29 wound around the pipe 20. The driving device 10 (not shown) housed in the pipe 20 is connected to a power supply by a cord 28. The screen 29 can be wound on or pulled out of the pipe 20 by operating the driving device 10 to rotate the winding pipe 20 in the direction of the arrow 30 or the arrow 31 (see arrows 33 and 32).

Further, when the take-up pipe 20 is rotated by a predetermined number (a number set in advance by the user) in the forward or reverse direction, the limit switch of the switch section 12 is actuated, the driving device 10 is stopped, and the take-up is stopped. The rotation of the pipe 20 is stopped. With such a function of the limit switch, the take-up pipe 20 can be automatically stopped when the screen 29 has been pulled out and taken up.

[0005] Regarding the limit switch that functions as described above, see, for example, JP-A-5-118402 and JP-A-5-118402.
-118403.

The thermostat is provided inside the motor 14 and operates when the temperature of the coil of the motor 14 rises above a predetermined value, thereby preventing the motor 14 from burning due to overheating of the motor 14.

In the conventional state detecting device, the operation of the limit switch is determined by detecting the presence or absence of power supply to the driving device by, for example, a current detecting circuit. However, in this method, a current detection circuit must be inserted in the input power supply circuit of the driving device. Further, there is a problem in that it is not possible to specify which of the limit switch and the thermostat has been operated even when the stop of the power supply to the drive device is detected.

Therefore, in order to solve the above-mentioned problem, conventionally, the time from the start of operation of the drive device to the stop of the operation by the limit switch is accurately measured in advance, and this time and the state of the operation switch are measured. It is used to estimate whether the limit switch is activated or the thermostat is activated. That is, if the driving device stops before the reference time elapses, it is determined that the thermostat has been activated. However, in the above-described conventional state detection device, measurement of operation time,
A device such as a comparison between a reference time and a measurement time is required, and there is a problem in the complexity and reliability of the device.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a state detecting device capable of accurately grasping the operating state of a drive device by detecting a plurality of voltages from an input power supply terminal of the drive device and a terminal of an operation switch. To provide.

[0010]

According to the present invention, there is provided a motor which is rotatable in a forward direction and a reverse direction, a first limit switch connected in series to the motor and stopping the forward direction rotation in accordance with the rotation speed of the motor. A second limit switch connected in series to the motor to stop reverse rotation according to the rotation speed of the motor, and a thermostat connected in series to the motor; the first and second limit switches; The thermostat is a state detection circuit that has only one contact each and detects an operation state of a drive device that changes from a closed state to an open state when operated. The start / stop and rotation direction of the operation of the motor are controlled by the drive. Operated by an operation switch connected to the device, the state detection circuit detects a plurality of voltages from the driving device and the operation switch, and detects each of the plurality of voltages. It converted into binary logic signals, depending on the combination of said plurality of binary logic signals, a state detection circuit of the drive device and outputs a signal indicating the operating state of the drive device.

[0011]

FIG. 1 shows a driving apparatus (40) to which the present invention can be applied.
FIG.

As shown in FIG. 1, the driving device 40 includes limit switches 42 and 44, a thermostat 46, a condenser 48, and a motor 49 (motor coils 50 and 52).
), And an operation switch 54. Power supply voltage Va
c is applied to the driving device 40 via the operation switch 54 to drive the driving device 40. Power supply is usually 100V
Alternatively, a 200 V commercial power supply is used.

When the operation switch 54 is in the illustrated state, the motor 49 rotates, for example, in the forward direction, and a screen or the like mounted on a pipe (corresponding to the pipe 20 in FIG. 3) is wound. When the rotation of the motor (that is, the rotation of the screen winding / drawing pipe) reaches a predetermined number, the drive device 40 operates and stops the limit switch 42. On the other hand, when the movable piece (arm) 55 of the operation switch 54 is connected to the terminal 60, a current flows through the motor coil 52, the motor 49 rotates in the opposite direction, and a screen or the like is drawn out of the pipe. As in the above case, the driving device 40
When the rotation of the motor (that is, the rotation of the pipe around which the screen is wound) reaches a predetermined number, the limit switch 44
Operates and stops. Further, when the movable piece 55 of the operation switch 54 is connected to the terminal 58, the driving device 40 is stopped.

The operating state of the driving device 40 in FIG. 1 is one of the following six operating states. That is, when the movable piece 55 of the operation switch 54 is connected to the terminal 56 and the driving device 40 is winding the screen or the like (referred to as a first state), the movable piece 55 of the operation switch 54 is connected to the terminal 58. And the driving device 40 is stopped (referred to as a second state).
When the movable piece 55 of the operation switch 54 is connected to the terminal 60 and the driving device 40 is pulling out the screen or the like (referred to as a third state), in the first state, the limit switch 42 is opened ( Operates), the driving device 40 is stopped (referred to as a fourth state), in the third state, the limit switch 44 is opened, and the driving device 40 is stopped (referred to as a fifth state), the first state or the third state. In the state, the thermostat 46
Is operating, and the driving device 40 is stopped (referred to as a sixth state).

According to the state detecting circuit of the present invention, the operating states of the above six types of devices can be accurately identified and detected. Hereinafter, the embodiment of FIG. 1 will be described in more detail with reference to Table 1.

The present invention measures the input power of the drive unit 40 and the terminal voltage of the operation switch 54 in FIG. 1, and attempts to determine the operating state of the drive unit based on the measured plurality of voltage values. . In this embodiment, the voltage is measured at five points. That is, as shown, V1, V2, V3, V4, V
5 is measured. Each of the voltages V1 to V5 is set to a logical value 1 when the voltage value is equal to or more than a predetermined threshold value,
If the logical value is 0 when the threshold value is smaller than the predetermined threshold value, the above-mentioned six operation states (first to sixth states) are, as shown in Table 1, respectively, voltages V1 to V5 (that is, respective voltages V1 to V5). 2
It can be identified by a combination of values 1 and 0) which are logical values.

[0017]

[Table 1]

The embodiment of the present invention is based on the above idea, and receives the voltages V1 to V5 and outputs a signal representing the operating state of the driving device. An embodiment of the present invention will be further described with reference to FIG.

The voltages V1 to V5 shown in FIG. 1 are detected by voltage detection / logic value converters 70a to 70e, respectively, and are converted into binary logic signals. Next stage logic circuit 80
Receives the converted five types of binary logic signals, responds to any one of the six types of combinations of the five types of binary logic signals (there are 32 combinations), and outputs the output signal. Output to any of the output terminals 84a to 84f. For example, a signal indicating the first state is output to the output terminal 84a,
Similarly, signals indicating the second to sixth states are output to output terminals 84b to 84f, respectively. That is, the output terminals 84a to 84a
By detecting which of 4f the output signal is output, it is possible to know in which state the driving device 40 is.

The logic circuit 80 that outputs a signal indicating the operation state of the driving device according to the combination of the voltages V1 to V5
Since a person skilled in the art can easily design and manufacture, a detailed description is omitted.

For voltage detection performed by the voltage detection / logic value converters 70a to 70e, for example, a photocoupler may be used. Output signals obtained from the output terminals 84a to 84f are used to turn on an indicator light for indicating the operation state of the drive circuit or to operate another appropriate control circuit, as described above. Is done.

[0022]

According to the present invention, there is a remarkable effect that a change in the state of the driving device can be easily and accurately detected based on the terminal voltage of the operation switch and the input power supply voltage of the driving device.

[Brief description of the drawings]

FIG. 1 is a drive circuit diagram of a drive device.

FIG. 2 is a diagram illustrating a state detection device for a driving device according to the present invention.

FIG. 3 is a diagram illustrating a driving device.

Claims (1)

(57) [Claims] 1. A motor rotatable in forward and reverse directions, a first limit switch connected in series with the motor to stop the forward rotation according to the rotation speed of the motor, and a first limit switch connected in series with the motor. A second limit switch for stopping reverse rotation according to the number of rotations of the motor, and a thermostat connected in series to the motor;
And a second limit switch, and the thermostat, each having only one contact, and a state detection circuit that detects an operation state of the drive device that changes from a closed state to an open state when operated. The stop and rotation directions are operated by an operation switch connected to the drive device. The state detection circuit detects a plurality of voltages from the drive device and the operation switch, and converts each of the plurality of voltages into a binary logic signal. A state detection circuit for a driving device, which converts and outputs a signal indicating an operation state of the driving device according to a combination of the plurality of binary logic signals.