JPH0622573A - Apparatus for driving motor-driven curtain - Google Patents

Abstract

PURPOSE:To deal with the overheat of a motor, without requiring any overheat sensing means on the side of the motor. CONSTITUTION:The power fed to a motor M is sensed from the output voltage and current of a power supply part 2, which are sensed respectively by voltage and current sensing parts 7, 8. This power is integrated by a control part 1, and the integrated power when driving the motor M is calculated, and further, the temperature of the motor M is inferred from the integrated power. Thereby, without requiring any overheat sensing means on the side of the motor M, the temperature of the motor M can be known. When the temperature of the motor M reaches an allowable value, the power feeding given from the power supply 2 to the motor M is stopped forcedly, and the disposition of the overheat of the motor M is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric curtain drive device for automatically opening and closing a curtain.

[0002]

2. Description of the Related Art A conventional general curtain drive device is shown in FIG.
Shown in. This curtain drive device includes a motor M for driving the curtain, a power supply unit 2 for supplying electric power to the motor M and adjusting the supplied power, and a polarity of a voltage applied to the motor M for switching the curtain open / close drive. A polarity switching unit 3, an operating unit 4 for performing operations such as opening and closing the curtain or stopping the opening and closing operation, a speed setting unit 5 for setting the opening and closing speed of the curtain, and a speed detection unit 6 for detecting the speed of the motor M. The control unit 1 is composed of a microcomputer that controls the motor speed to a set speed by adjusting the power supplied from the power supply unit 2 according to the detection output of the speed detection unit 6.

In this type of electric curtain drive device, a general DC motor is used as the motor M, and in the DC motor, the motor current I _M changes as shown in FIG. 5A each time the excitation phase is switched. Therefore, the speed detecting section 6 detects the motor current I _M to detect the speed. For example, the current transformer is used to detect the motor current I _M. At the output of the speed detecting unit 6 using this current transformer, a pulsed output shown in FIG.

As the power supply unit 2, for example, a DC voltage obtained by rectifying and smoothing an AC power supply AC is converted into an AC voltage by using an inverter, and the output of the inverter is further rectified and smoothed to apply a DC voltage to the motor M Anything that creates a voltage can be used. When such a power supply unit 2 is used, the output voltage can be adjusted by controlling the on-duty or the switching frequency of the switching element of the inverter.

The control unit 1 detects the motor speed from the output of the speed detection unit 6 and compares the motor speed with the set speed set by the speed setting unit 5 to keep the curtain opening / closing speed at the set speed. The speed control unit 1a is built in. Now
When the motor speed is faster than the set speed, the power supply unit 2 is instructed to lower the output voltage, and when the motor speed is slower than the set speed, the output voltage is increased to give the motor speed. Keep at set speed.

In the speed controller 1a, the speed detector 6
Is output through the filter, only the speed component of the motor M is extracted from the output of the speed detector 6, and compared with the reference voltage indicated by the broken line in FIG. Is converted into a speed signal composed of pulse signals of, and the motor speed is detected from the trailing edge of this speed signal. In this kind of electric curtain drive device, when the curtain reaches the end of the curtain rail, the drive of the motor M is stopped and the excitation phase is not switched. Therefore, the period in which the trailing edge of the speed signal is no longer detected is counted using the counter built in the control unit 1, and if it reaches the predetermined period, it is determined that the curtain has reached the end of the curtain rail, Then, the application of the output voltage of the power supply unit 2 to the motor M is stopped.
This operation control is performed by software processing in the control unit 1.

[0007]

By the way, in the case of the above-mentioned electric curtain drive device, the electric power of several tens to several hundreds of watts is required for opening and closing the curtain, and if the motor is continuously operated without limitation, the motor M will be operated. There was a fear that it would overheat and eventually be destroyed. To eliminate this point,
A temperature sensor is attached to the motor M, the control unit 1 monitors the output of the temperature sensor, and it is determined whether or not the motor M is overheated based on a preset determination condition. If it is determined, it is possible to forcibly stop the application of the output voltage of the power supply unit 2.

However, in this way, the number of wires between the motor M and the electric curtain drive device increases,
In addition to the risk of incorrect connection, there is a problem that if the wiring between the temperature sensor and the electric curtain drive device is broken, or if the temperature sensor is not properly attached, overheating of the motor M cannot be prevented. . The present invention has been made in view of the above points, and an object thereof is an electric curtain drive capable of taking measures against overheating of a motor without requiring any overheat detecting means on the motor side. To provide a device.

[0009]

In order to achieve the above object, the present invention integrates the electric power at the time of driving the motor with the electric power detection means for detecting the electric power supplied to the motor and calculates the motor temperature from the integrated electric power. A motor temperature estimating means for estimating is provided, and when the estimated motor temperature reaches a predetermined temperature, the control means forcibly stops the power supply from the power supply means to the motor.

[0010]

According to the present invention, by estimating the motor temperature from the integrated electric power supplied to the motor as described above, the temperature of the motor can be known without requiring any overheat detecting means on the motor side. Then, when the estimated motor temperature reaches a predetermined temperature, the control means can forcibly stop the power supply from the power supply means to the motor to take measures against overheating of the motor.

[0011]

1 to 3 show an embodiment of the present invention. Book
The configuration of the embodiment is basically the same as that described in FIG.
Yes, in the present embodiment, the output voltage V of the power supply unit 2_OAnd output current
I _OA voltage detector 7 and a current detector 8 for respectively detecting
And the outputs of the detection units 7 and 8 are input to the control unit 1.
It is characterized by certain points. In the case of this embodiment, the power supply unit
The output voltage of 2 is detected by resistance division, and the output current is
Motor current I_MOf the resistance inserted in series to the supply line of
The voltage is detected from both ends.

In this embodiment, when there is an input from the operating section 4, the polarity switching section 3 is switched and controlled as shown in FIG. 2, and then the output voltage of the power source section 2 is applied to the motor M. By applying the voltage, the curtain is opened and closed. When the speed signal is obtained, the motor speed is compared with the set speed to control the motor speed to the set speed.
Here, before the processing for controlling the motor speed, the motor temperature is estimated, and when the estimated temperature is equal to or higher than the allowable value, the application of the output voltage of the power supply unit 2 to the motor M is stopped. As a result, the motor M is forcibly stopped.

To estimate the motor temperature, the electric power supplied to the motor M is calculated from the output voltage V _O and the output current I _{O of} the power supply unit 2 detected by the voltage detection unit 7 and the current detection unit 8, and the calculation is performed. The integrated power P is obtained by integrating the results.
That is, since the integrated power P during driving of the motor M and the temperature of the motor M have the relationship shown in FIG. 3, the calculated integrated power P is collated with the motor temperature characteristic with respect to the integrated power to estimate the motor temperature. To do. In this case, the control unit 1 may store a data table of the motor temperature corresponding to the integrated electric power P and read the motor temperature corresponding to the calculated integrated electric power. In the case of this embodiment, the temperature of the coil of the motor M is detected.

By estimating the motor temperature from the integrated electric power P supplied to the motor M in this way, the motor temperature can be known on the drive unit side without requiring any overheat detecting means on the motor M side. Therefore, it is possible to take measures against overheating of the motor M based on the motor temperature. by the way,
The integrated electric power P in the above case is initialized when a standby state in which the driving of the motor M is stopped has elapsed for a predetermined time. However, in order to perform a better countermeasure against the overheating of the motor M, a method of reducing the integrated electric power in accordance with the characteristic of the motor temperature lowering with the passage of time during standby may be adopted. Further, if the speed detector detects the motor current I _M , the motor current I _M may be used to obtain the integrated power.

[0015]

As described above, the present invention comprises the electric power detecting means for detecting the electric power supplied to the motor and the motor temperature estimating means for accumulating the electric power at the time of driving the motor and estimating the motor temperature from the integrated electric power. Since the control means forcibly stops the power supply from the power supply means to the motor when the estimated and estimated motor temperature reaches the predetermined temperature, the motor temperature is calculated from the integrated power supplied to the motor. The temperature of the motor can be estimated and the temperature of the motor can be known without requiring any overheat detecting means on the motor side. When the estimated motor temperature reaches the predetermined temperature, the motor from the power supply means is controlled by the control means. It is possible to take measures against motor overheating by forcibly stopping the power supply to the motor.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the above.

FIG. 3 is a flowchart showing a method for estimating a motor temperature.

FIG. 4 is a circuit diagram of a conventional example.

FIG. 5 is an explanatory diagram of a speed detection method in the above.

[Explanation of symbols]

 1 Control unit 2 Power supply unit 6 Speed detection unit 7 Voltage detection unit 8 Current detection unit M motor

Claims (1)

[Claims] 1. A motor for opening and closing a curtain, an electric power supply means for supplying electric power to the motor to adjust the supplied electric power, a speed detecting means for detecting a speed of the motor, and an output of the speed detecting means. In the electric curtain drive device, the electric power is supplied from the electric power supply means to control the motor speed to a set speed. And a motor temperature estimation means for estimating the motor temperature from the integrated power, and when the estimated motor temperature reaches a predetermined temperature, the control means forcibly supplies the power from the power supply means to the motor. The electric curtain drive device is characterized in that