JPH11190182A - Motor-driven blind - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven blind such that the opening and closing angles of slats can be surely held within the desired controlled range of angles. SOLUTION: This motor-driven blind has an induction motor 7 for opening and closing a plurality of slats 14 by rotation, a commanding part 9 for commanding the opening or closing movement of the plurality of slats 14, a motor driving part 6 for driving and braking the induction motor 7, and a rotation detecting part 18 for outputting a detection signal each time the induction motor 7 rotates through a predetermined angle. The blind also includes an MPU 4 for causing the motor driving part 6 to drive the induction motor 7 when the commanding part 9 commands, and the causing the motor driving part 6 to brake the induction motor when the detection signals output from the rotation detecting part 18 are detected a predetermined number of times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blind installed in an opening of a house for sunshade or blindfold, and more particularly to an electric blind for opening and closing a plurality of blades using an induction motor.

[0002]

2. Description of the Related Art Currently, electric blinds for opening and closing blind blades according to the rotation of an electric motor are widely known.
A DC motor is mainly used as the motor. Compared to induction motors, DC motors have the advantage of simpler mechanical structure of the electric blind because they have better controllability such as braking, but have the disadvantage of higher cost.

[0003] When an induction motor is used for an electric blind, there are cases where braking is required depending on the load and cases where it is not necessary. However, in order to obtain braking similar to that of a DC motor, it must be used together with an electromagnetic brake. There are many. For example,
The induction motor with a brake disclosed in Japanese Utility Model Laid-Open Publication No. 3-54357 has a built-in brake mechanism inside the induction motor, and is braked by a brake plate provided on the rotor when power is not supplied. Then, the rotor is moved in the axial direction by the electromagnetic attraction force received from the stator by energization, and the braking of the brake plate is released, so that the induction motor can be rotated.

In recent years, an electric blind system has been developed in which a plurality of electric blinds are installed in an intelligent building or the like and controlled in conjunction with each other so as to have the same elevation height and the same opening / closing angle. For example, the electric blind disclosed in Japanese Patent Application Laid-Open No. 64-62589 filed by the present applicant has a disk-shaped encoder in which slits and non-slits are alternately provided on a lifting shaft, and The induction motor is controlled in synchronization with a pulse signal generated by rotation. Since the induction motor is stopped in synchronization with the pulse generated by the rotation of the elevating shaft, it is possible to easily unify the opening and closing angles of the blades even with a plurality of electric blind devices.

[0005] Further, the present applicant has filed Japanese Patent Application No. 9-238351.
The electric blind disclosed in Japanese Patent Application Laid-Open Publication No. H11-15795 brakes an induction motor without using an electromagnetic brake. When stopping the blade at a desired blade angle, the electric blind stops the driving of the induction motor and performs the rotation operation in the direction opposite to the rotation direction up to that time for a predetermined time in the numerical table, thereby inducing the induction. By stopping the drive of the motor, a reverse rotation torque is applied so as to cancel inertia acting in the same rotation direction, and the blade is stopped at a desired blade angle.

Further, the applicant of the present invention has disclosed Japanese Patent Application No. 9-359087.
Discloses another electric blind that performs braking of an induction motor without using an electromagnetic brake. This electric blind rectifies an AC power supply to generate a DC current, and drives or brakes the induction motor by selectively outputting the AC current and the rectified current by a triac. When stopping the blades at a desired blade angle, the electric blind stops driving the induction motor and applies a rectified current to the stator to generate a magnetic force between the stator and the rotor to perform braking. ing.

[0007]

However, when an electromagnetic brake is used to open and close the blades of the electric blind, for example, the blade angle is divided into 15 steps including horizontal from full open to fully closed to open and close the steps. , The electromagnetic brake for braking operates at each step.
Therefore, when the blades are continuously stepped open / closed, the operation sound of the electromagnetic brake is continuously generated, and there is a problem that a discomfort is given to a person other than the person operating the electromagnetic brake. Was.

When an induction motor is used to open and close the blades of the electric blind, the number of rotations transmitted by the induction motor differs between electric blinds having different power supply frequencies and different speed reduction mechanisms. Therefore, when the blades are stepped open / closed, the stepped opening / closing speeds of the blades of the respective electric blinds are different, so that there is a problem that the opening / closing angles of the blades of the respective electric blinds are different in the stepping operation of two or more steps. .

In order to solve these problems, Japanese Patent Application No. 9-23835 filed by the present applicant as described above has been proposed.
Although there is an electric blind disclosed in No. 1, the setting of the reverse rotation operation time is a half cycle unit of the frequency of the AC power supply,
Since it cannot be set more finely, an accurate step opening / closing operation cannot be performed. Furthermore, when the load on the blades increases, the induction motor receives extra inertial force due to the load, and the induction motor rotates excessively at the time of opening and closing, so that there is a problem that it can be applied only to blinds with a small load.

As described above, there is also an electric blind disclosed in Japanese Patent Application No. 9-359087 filed by the present applicant. In the case of a blind in which the opening and closing of the blade and the raising and lowering of the blind are driven by one induction motor. When the motor is stopped, a large load is applied to the induction motor.Therefore, it is necessary to supply a large DC current, and an induction motor that does not cause a heat problem must be used. Since the DC power converter is also expensive, there is a problem in terms of cost to obtain complete braking. In addition, since the induction motor rotates in the direction in which the load is applied during the stop period during the step opening / closing operation, there is a problem that this braking method cannot be used for a blind having a large load.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to ensure that the opening and closing angle of the blade of the blind falls within a desired management angle. It is possible to provide an electric blind.

An object of the invention described in claim 4 is that even when the blind is on the upper side and the amount of inertia due to the weight of the blade increases, the opening and closing angle of the blade of the blind can be reliably kept within the management angle. It is to provide an electric blind.

It is an object of the present invention to provide an electric blind capable of performing an opening operation so as to cancel an amount of inertia at the time of opening operation of the blade.

An object of the invention described in claim 6 is to provide an electric blind capable of improving the degree of closing of the blades of the blind.

An object of the invention described in claim 7 is to provide an electric blind which operates quietly even when an electromagnetic brake is used for braking.

It is an object of the present invention to provide an electric blind capable of easily setting a blade angle.

[0017]

According to a first aspect of the present invention, an electric blind includes an induction motor for opening and closing a plurality of blades by rotation, and an instructing unit for instructing an opening operation or a closing operation of the plurality of blades. A driving means for driving and braking the induction motor, an angle detection means for outputting a detection signal every time the induction motor rotates by a predetermined angle, and an instruction motor provided to the driving means when instructed by the instruction means. And control means for causing the drive means to brake the induction motor when the detection signal output from the angle detection means is detected a predetermined number of times.

The control means, when detecting the detection signal outputted from the angle detection means a predetermined number of times, causes the drive means to brake the induction motor, so that the opening / closing angle of the blades of the blind falls within a desired management angle. It becomes possible.

According to a second aspect of the present invention, there is provided the electric blind according to the first aspect, wherein the control means includes a counting means for counting a detection signal output from the angle detecting means, and a count value by the counting means. Calculating means for calculating the management angle based on the control signal, and instructing the driving means to drive the induction motor when instructed by the instructing means, wherein the driving means drives the induction motor every time the management angle calculated by the calculating means changes. Drive control means for braking the vehicle.

The drive control means causes the drive means to brake the induction motor every time the control angle calculated by the calculation means changes, so that the opening / closing angle of the blade of the blind can be reliably kept within the desired control angle. Becomes

According to a third aspect of the present invention, there is provided the electric blind according to the second aspect, wherein the calculating means calculates the management angle based on the counting by the counting means based on the time when the elevator is stopped.

Since the calculating means calculates the management angle based on the time when the elevator is stopped, it is possible to calculate the management angle accurately.

The electric blind according to a fourth aspect is the electric blind according to the second or third aspect, wherein the electric blind further comprises height detecting means for detecting the height of the blind, and an upper side height of the blind. Height setting means for setting the height, the calculating means is the height of the blind detected by the height detecting means, the upper side of the upper height set in the upper height setting means If you have
When the width of the count value by the counting means corresponding to the control angle is widened, and the height of the blind detected by the height detecting means is lower than the upper height set by the upper height setting means. Reduces the width of the count value by the counting means corresponding to the management angle.

When the height of the blind is on the upper side of the upper side height, the calculating means increases the width of the count value by the counting means corresponding to the control angle, so that the upper side where the amount of inertia increases is used. Also, the opening and closing angle of the blades of the blind can be reliably kept within the control angle.

According to a fifth aspect of the present invention, there is provided the electric blind according to the fourth aspect, wherein the drive control means detects the opening of the blind detected by the height detecting means when the opening operation is instructed from the instructing means. When the height is on the upper side of the upper side height set in the upper side height setting means, the driving means drives the induction motor, and after the management angle calculated by the calculating means changes, the angle detecting means After detecting the detection signal output from the control unit a predetermined number of times, the driving means brakes the induction motor.

When the height of the blind is on the upper side of the upper side, the drive control means detects the detection signal a predetermined number of times after the control angle has changed, and then brakes the induction motor. The opening and closing angle of the blind blades can be controlled in consideration of the above, and the opening and closing angle can be reliably kept within the management angle.

The electric blind according to claim 6 is the electric blind according to any one of claims 2 to 5,
The electric blind further includes enlargement instruction means for instructing the expansion of the opening / closing angle range of the plurality of blades, and the counting means determines whether or not the enlargement of the opening / closing angle range is instructed by the enlargement instruction means at the end of the management angle. Do not count.

The counting means does not perform the predetermined number of counts at the end of the control angle when the opening / closing angle range is instructed by the enlargement instructing means. Thus, the degree of closing of the blade can be improved.

[0029] The electric blind according to claim 7 is the electric blind according to claim 2 or 3, wherein the electric blind further includes height detecting means for detecting the height of the blind, and an upper side height of the blind. Height setting means for setting the height, and an electromagnetic brake for braking the induction motor, the drive control means, the height of the blind detected by the height detection means, the upper height When it is located on the upper side of the upper side height set in the setting means, when there is an instruction from the instruction means, the driving means drives the induction motor, and the drive is performed every time the management angle calculated by the calculation means changes. The means and the electromagnetic brake cause the induction motor to brake.

When the height of the blind is above the upper height, the drive control means causes the drive means and the electromagnetic brake to brake the induction motor every time the control angle calculated by the calculation means changes. Also, on the upper side where the amount of inertia is large, the opening and closing angle of the blade of the blind can be reliably kept within the management angle.

The electric blind according to claim 8 is the electric blind according to claim 2 or 3, wherein the electric blind further includes angle setting means for setting an opening / closing angle of a plurality of blades, and angle setting means. When the opening / closing angle is set, first, the driving means drives the induction motor to a specific end angle ("fully open" or "fully closed"), and then drives the opposite end toward the opposite end so that the control angle is reduced. Angle setting control means for causing the driving means to brake the induction motor when the opening / closing angle matches the opening / closing angle set in the angle setting means.

When the opening / closing angle is set by the angle setting means, the angle setting control means first performs the opening / closing operation to a specific end angle, and then performs the opening / closing operation in the opposite end direction. In order to cause the drive means to brake the induction motor so that the opening / closing angle and the management angle match,
Since the stop is always performed in the same opening / closing direction, the reproducibility of the angle of the blade can be improved.

[0033]

FIG. 1 is a block diagram showing a schematic configuration of an electric blind according to an embodiment of the present invention. The electric blind includes a power input unit 1 to which 100V AC power is input, a power transformer 2, a stabilized power unit 3 for converting an AC voltage output from the power transformer 2 into a predetermined DC voltage, and control of the electric blind. (Micro Processing Unit) 4, a zero-cross detection unit 5 for detecting a zero-cross point of the voltage of the AC power supply, a motor drive unit 6 for driving the induction motor 7, an electromagnetic brake 8, an open switch. A command unit 9 comprising a switch 91, a closing switch 92, an up switch 93, a down switch 94 and a stop switch 95; a command unit 10 comprising angle setting switches 1001 to 1015 for setting the angle of the blade; An end management angle width addition switch 11 for increasing the management angle width in the closed position, which determines whether the height of the blind is on the upper side or the lower side. Upper setting switch 12, a speed reduction mechanism 71 for reducing the rotation of the induction motor 7, an opening / closing drum 13 connected to the speed reduction mechanism 71 by a shaft, a plurality of blades 14, Ladder code 1 for opening and closing
5, a bottom rail 16 provided at the lower end of the blind,
Lifting tables 17 for raising and lowering the blinds,
And a rotation detector 18 for detecting the angle of the blade 14
including.

The 100 V AC power input to the power input unit 1 is stepped down by the power transformer 2 and supplied to the stabilized power unit 3. The stabilized power supply unit 3 generates and outputs a DC voltage to be supplied to the MPU 4 and the like. Further, the zero-cross detecting unit 5 detects that the AC voltage input to the power input unit 1 becomes 0 V, and outputs it to the MPU 4 as a pulse waveform.

The AC voltage of 100 V input to the power input unit 1 is also supplied to the motor drive unit 6. The motor drive unit 6 rectifies the supplied AC current and selectively outputs the rectified current and the AC current to the induction motor 7. The motor drive unit 6 controls the output of the alternating current and the rectified current based on the control signal output from the MPU 4, and controls the normal rotation, the reverse rotation, and the stop of the induction motor 7. The motor drive unit 6 also controls supply of an AC voltage to the electromagnetic brake 8.

The rotation of the induction motor 7 is reduced by a reduction mechanism 71, and the reduced rotation is transmitted to the opening / closing drum 13 and the rotation detector 18 by a shaft. The opening / closing drum 13 opens and closes the blade 14 via a ladder cord 15 by rotation of a shaft. One of the ladder cords 15 is wound around and fixed to the opening / closing drum 13, and the other is provided so as to sandwich the plurality of blades 14 at regular intervals, and the lower end thereof is fixed to the bottom rail 16.

One end of a lifting tape 17 for raising and lowering the blind is fixed to the bottom rail 16. The other end of the lifting tape 17 passes through a through hole formed in the plurality of blades 14 and is fixed to a lifting drum (not shown). The lifting drum and the opening / closing drum 13 are connected by a clutch mechanism (not shown).
Is a mechanism that rises through the opening direction or descends through the closing direction. That is, when the lifting tape 17 is wound on the lifting drum, the blade 14 rises after the opening angle reaches the fully opened position, and when the lifting tape 17 is rewound from the lifting drum, the blade 14 moves to the fully closed position. After descending, it descends.

The rotation detecting section 18 has a slit 19A.
And a non-slit 19B alternately provided on the entire circumference
9 and a photo interrupter 20. A transmission type photo interrupter 20 is provided so as to sandwich the disk 19. Light from a light emitting element included in the photo interrupter 20 is passed and blocked by the slit 19A and the non-slit 19B, and a light receiving element provided opposite to the light emitting element converts a light pulse into an electric pulse and outputs it. When the shaft to which the lifting drum is connected rotates and the lifting operation is performed, a pulse proportional to the rotation (hereinafter, referred to as an encoder signal) is output from the rotation detecting unit 18 and input to the MPU 4. The MPU 4 counts the encoder signal and detects the height position of the blind.

The starting point of the height data is when the upper limit switch, which is turned on when the blade 14 and the bottom rail 16 are wound up, is turned on. It is “0”. Also,
Conversely, there is also provided a lower limit switch that is turned on when the blind is lowered to the lowermost position, so that the up / down operation can be performed within a range where the upper limit switch and the lower limit switch are turned on. That is, the value of the height data when the lower limit switch is turned on becomes the maximum value.

When the open switch 91 of the command section 9 is pressed, the MPU 4 controls the blade 14 to rotate in the opening direction. When the close switch 92 is pressed, the blade 14 closes. The control is performed so as to rotate to.
In addition, the angle setting switches 1001 to 101 of the command unit 10
Reference numeral 5 denotes a switch for setting the angle of the blade. The angle of the blade is defined as the fully open position which is the end of the induction motor 7 in the forward rotation direction (actually the fully closed position like the end in the reverse direction, but for convenience, it is referred to as the fully open position). 1 ", the angle at which the blade is horizontal is" 8 ", and the fully closed position at the end in the reverse direction is" 15 ". That is, the fully open position is divided into 15 from the fully open position, and each of the management angles corresponds to the angle setting switches 1001 to 1015. For example, when the angle setting switch 1004 is pressed,
The induction motor 7 is rotated forward or backward from the control angle at the time of the command so that the control angle becomes "4", and control is performed so that the control angle of the blade becomes "4".

The edge management angle width addition switch 11 is a 2-bit switch, and can set data of "0" to "3". Edge management angle width addition switch 1
By increasing the control angle width at the end position of the fully open position (management angle is “1”) and the fully closed position (management angle is “15”) by the value set to 1, the fully open position or the fully closed position is obtained. And the opening / closing range width can be increased.

The upper setting switch 12 is a 4-bit switch, and can set a value from "0" to "15". The value set in the upper setting switch 12 is a height for determining whether the height of the blind when performing the opening / closing operation is the upper side or the lower side. As described later, when the height of the blind for performing the opening / closing operation is on the upper side, the opening / closing operation is performed by increasing the unit management angle width.

The MPU 4 has a RAM (Random Acceses).
s Memory), the height data of the blind calculated by the pulse from the rotation detecting unit 18, the angle counter which is the count value of the pulse output from the rotation detecting unit 18 based on the time when the vertical movement stops, A fully-open additional counter and a fully-closed additional counter for managing end addition when the value of the angle counter is an end value, and an area for storing management angle data calculated from the value of the angle counter are predetermined. ing.

FIG. 2 is a block diagram showing a schematic configuration of the motor driving section 6. The motor drive unit 6 includes a gate control circuit unit 26 for controlling the output of the AC current and the rectified current to the induction motor 7 and the output of the AC current to the electromagnetic brake 8 under the control of the MPU 4, and a bidirectional semiconductor switch. And the diode 2
5 is included.

When the induction motor 7 is rotated forward, the MPU 4
, The gate control circuit 26 turns on the triac 21. As a result, the CW (Cl
ockWise) and COM (COMmon), an AC voltage of 100 V is applied, and the induction motor 7 rotates forward.

When the induction motor 7 is reversed, M
The gate control circuit 26 turns on the triac 22 in response to an instruction from the PU 4. As a result, the CC of the induction motor 7
An AC voltage of 100 V is applied between W (Counter Clock Wise) and COM, and the induction motor 7 reverses.

When the induction motor 7 is subjected to DC braking,
The gate control circuit 26 turns on the triac 24.
As a result, the current half-wave rectified by the diode 25 flows from CW of the induction motor 7 to COM, and the induction motor 7 is braked.

When the induction motor 7 is rotated forward or backward, the gate control circuit 26 turns on the triac 23. As a result, an AC voltage of 100 V is applied to the electromagnetic brake 8, and the braking of the electromagnetic brake 8 is released. In addition,
The capacitor 72 provided between the CW and CCW of the induction motor 7 is a phase advance capacitor.

FIG. 3 is a diagram showing the relationship among the encoder signal, the angle counter, the management angle data, the fully open additional counter, and the fully closed additional counter which are the outputs from the rotation detector 18 shown in FIG. As shown in FIG. 3A, a pulse signal is generated with the rotation of the disk 19 of the rotation detecting unit 18.
The MPU 4 detects a change point of the encoder signal, and
The angle counter is incremented from 0 as shown in FIG. However, the value of this angle counter indicates when the height of the blind is below the height set by the upper setting switch 12.

The MPU 4 calculates management angle data based on the value of the angle counter. When the blind is below the height set by the upper setting switch 12, as shown in FIG. 3C, every time the value of the angle counter increases by 2, the value of the management angle data increases by one. When the management angle data is “1”, the fully open position is shown, when “8”, the horizontal position is shown, and when “15”, the fully closed position is shown.

FIG. 3D shows management angle data when the height of the blind is higher than the height set by the upper setting switch 12. Until the value of the angle counter is "1", the value of the management angle data is "1", but when the value of the angle counter is "2", the value of the management angle data is "4". Thereafter, every time the value of the angle counter increases by 3, the value of the management angle data increases by one. When the value of the angle counter becomes “29”, the value of the management angle data changes from “12” to “15”. Thus, when the blind is on the upper side, the width of the management angle data for the angle counter is widened.

FIG. 3E shows the value of the angle counter when the end management angle width addition switch 11 is set to "1", and FIG. It shows the value of the closed addition counter. When "1" is set to the end management angle width addition switch 11, the count width increases when the angle counters are "2" and "29". That is, the other count values are incremented at the change points of the encoder signal, but only at "2" and "29", the change points of the encoder signal are incremented by two. For the fully open additional counter, the angle counter is "2"
, And the fully closed additional counter is incremented when the angle counter is “29”.

Next, the operation of raising and lowering the electric blind in this embodiment will be described. When the lift switch 93 is pressed by the operator and an instruction to raise the blind is issued, the MPU 4 releases the braking of the electromagnetic brake 8 to the motor drive unit 6 in synchronization with the zero cross signal from the zero cross detection unit 5. To output the release ON signal for When the release ON signal is input, the motor drive unit 6
Is turned on to apply an AC voltage to the electromagnetic brake 8. At this time, the braking of the electromagnetic brake 8 is released, and the rotor of the induction motor 7 becomes rotatable. Further, the MPU 4 outputs a forward rotation signal for rotating the induction motor 6 forward to the gate control circuit section 26. The gate control circuit unit 26 includes the MPU 4
When the normal rotation signal is input from the controller, the triac 21 is turned on, and an AC voltage is applied to the induction motor 7. Since the braking of the electromagnetic brake 8 has been released, normal rotation starts. In general, the rotation of the induction motor 7 is very high, so that the speed is reduced by the speed reduction mechanism 71 to the vertical speed of the blind.

The rotation of the induction motor 7 rotates the lifting / lowering drum via a speed reduction mechanism 71 and a shaft, and further rotates the opening / closing drum 13 via a clutch. By the rotation of the lifting drum, the lifting tape 17 is wound up, and the blades 14b mounted on the bottom rail 16 are raised. Further, the rotation of the opening / closing drum 12 causes the blades 14a suspended by the ladder cord 15 to rotate simultaneously. At this time, the bottom rail 16 and the bottom rail 1
The blade 14b mounted on 6 keeps its state without rotating. When the full opening angle, which is the end of the blade in the normal rotation direction, is reached, the clutch is automatically disengaged and the rotation of the opening / closing drum 16 stops. Therefore, the blade angle during the raising operation of the blind is a fully open angle.

Similarly, in the case of the lowering operation of the blind, the MPU 4 outputs a release ON signal of the electromagnetic brake 8 to the motor drive unit 6. The gate control circuit unit 26 turns on the triac 23 to release the braking of the electromagnetic brake 8,
At the same time, the triac 22 is turned on and the inversion of the induction motor 7 is started. By rotating the lifting drum, the bottom rail 1
6 and the blades 14b on the bottom rail 16 start to descend. In addition, the rotation of the opening / closing drum 13 also rotates the blade 14a suspended by the ladder cord 15, but the clutch is disengaged at the fully closed angle which is the end in the reversal direction of the blade, and the blade angle becomes the fully closed angle. The lowering operation of the blind is continued as it is.

When the execution of the elevating operation by the stop switch 95 is completed, the MPU 4 instructs the electric motor drive unit 6 to brake the induction motor 7. The gate control circuit unit 26
When there is an instruction to brake the induction motor 7, the triac 2
1, 22 and 23 are turned off, the application of the AC voltage to the induction motor 7 is stopped, and the induction motor 7 is braked by the electromagnetic brake 8. At this time, the rotor of the induction motor 7 is braked, and the rotation of the induction motor 7 stops. When the rotation of the induction motor 7 is stopped, the blade angle is a fully open angle in the case of a rising operation, that is, the management angle is “1”.
In the case of the descending operation, the fully closed angle, that is, the management angle is “15”.

Next, the closing operation of the blade after the above-described ascent operation is stopped will be described. In addition, the case where the blind is on the lower side of the upper side height set by the upper side setting switch 12 will be described. Close switch 92 of command unit 9
Is pressed, the MPU 4 instructs the motor drive block to invert the induction motor 7 and release the electromagnetic brake 8. The motor drive unit 6 turns on the triacs 22 and 23, and sets the CCW and COM of the induction motor 7 to CCW and COM.
AC voltage is applied between the electromagnetic brake 8 and the electromagnetic brake 8. Since the blind has been stopped by the ascending operation, the blade 14a suspended by the ladder cord 18 is rotated from the fully open angle to the fully closed angle.

The MPU 4 sets an intermittent open / close timer for the intermittent open / close operation.
A flag is set every second. When this flag is set, the MPU 4 again applies the AC voltage for releasing the braking of the electromagnetic brake 8 and reversing the induction motor 7 described above.

FIG. 4 is a flowchart for explaining a processing procedure of the opening and closing operation of the electric blind in the present embodiment. First, it is determined whether or not the encoder signal from the rotation detector 18 has changed (S1). If the encoder signal does not change (S1, no change), the process ends. When the encoder signal has changed (S1, change), it is determined whether the rotation direction of the induction motor 7 is forward rotation or reverse rotation (S2). When the rotation direction of the induction motor 7 is reversed (S2, reverse), the height data is incremented (S3).

Then, it is determined whether or not the angle counter is "2" (S5). When the angle counter is "2" (S5, Yes), it is determined whether the full open addition counter is the value set in the end management angle width addition switch 11 (S6). If the value of the full-open addition counter is the value set in the end management angle width addition switch 11, step S
Proceed to 12. If the value of the full-open addition counter is smaller than the value set in the end management angle width addition switch 11, the value of the full-open addition counter is incremented (S
7), the process ends.

If the value of the angle counter is not "2" in step S5 (S5, No), it is determined whether or not the value of the angle counter is "29" (S8). If the value of the angle counter is not “29” (S8, No), the process proceeds to step S11. If the value of the angle counter is "29" (S8, Yes), it is determined whether or not the value of the fully closed addition counter is the value set in the end management angle width addition switch 11 (S9). If the value of the fully closed addition counter is smaller than the set value, the value of the fully closed addition counter is incremented (S10), and the process is terminated.

In step S9, if the value of the fully closed addition counter is a set value, the value of the angle counter is set to "3".
The value of the angle counter is determined to be “3”.
In the case of "1" (S11, Yes), the process proceeds to step S13, and if the value of the angle counter is not "31" (S11).
11, No), the value of the angle counter is incremented (S12), and the process proceeds to step S13.

If the rotation direction of the induction motor 7 is normal in step S2 (S2, normal rotation), the value of the height data is decremented (S30), and the value of the angle counter is determined to be "2". It is determined whether or not it is (S31). When the value of the angle counter is "2" (S31, Yes), it is determined whether the value of the full-open addition counter is "0" (S3).
2). If the value of the full-open addition counter is "0", the process proceeds to step S38. If the value of the full-open addition counter is larger than "0", the value of the full-open addition counter is decremented (S33), and the process ends.

If the value of the angle counter is not "2" in step S31 (S31, No), it is determined whether or not the value of the angle counter is "29" (S3).
4). When the value of the angle counter is not “29” (S3
4, No), and the process proceeds to step S37. When the value of the angle counter is "29" (S34, Yes), it is determined whether or not the value of the fully closed addition counter is "0" (S34).
35). If the value of the fully closed addition counter is larger than “0”, the value of the fully closed addition counter is decremented (S3).
6), end the process. If the value of the fully closed addition counter is “0”, it is determined whether or not the angle counter is “0” (S37). When the value of the angle counter is “0” (S37, Yes), the process proceeds to step S13. If the value of the angle counter is not “0” (S37, No),
The value of the angle counter is decremented (S38), and the process proceeds to step S13.

In step S13, the management angle is calculated with reference to the relationship between the angle counter and the management angle data shown in FIG. If the value of the management angle has not changed (S14, no change), the process ends. When the value of the management angle has changed (S14, change), it is determined whether or not the value of the management angle is the end ("1" or "15") (S15). When the control angle is at the end (S15, Ye
s) The application of the AC voltage to the electromagnetic brake 8 is stopped to brake the induction motor 7 (S20), and the process ends. If the value of the management angle is not the end (S15, No),
It is determined whether the instruction by the open switch 91 or the close switch 92 has stopped (S16). When the instruction by the open switch 91 or the close switch 92 is stopped (S16,
Yes), the application of the AC voltage to the electromagnetic brake 8 is stopped (S20), and the process ends. Open switch 91
Alternatively, when the instruction by the close switch 92 is not stopped (S16, No), it is determined whether or not the intermittent opening / closing operation is performed (S17). If it is an intermittent opening / closing operation (S17, Ye
s), a rectified current is applied to the induction motor 7 to perform braking (S1).
8), end the process. If it is not the intermittent opening / closing operation (S17, No), it is determined whether or not the management angle is a stop setting angle described later (S19). If the control angle is the stop set angle (S19, coincidence), an AC voltage is applied to the electromagnetic brake 8 to brake the induction motor 7 (S20), and the process ends. If the management angle is not the stop setting angle (S19, mismatch), the processing is terminated.

In accordance with the procedure described above, the closing operation of the blade after the raising operation of the blind is stopped will be described. First, when the encoder signal changes (S1, change), since the closing operation of the blade, that is, the rotation direction of the induction motor 7 is reversed (S2, reverse), the height data is incremented (S3). Since the value of the angle counter is “0” when the operation of raising the blind is stopped, the value of the angle counter is set to “0”.
At 2, the angle counter is incremented to "1"
(S12).

Then, the management angle data is calculated as "1" from the relationship between the angle counter shown in FIG. 3B and the management angle data shown in FIG. 3C (S13). At this time,
Since the value of the management angle has not changed (S14, no change), the processing is ended as it is.

Subsequently, when the encoder signal changes (S
1, change), and the height data is incremented (S
3) It is determined that the value of the angle counter is "2" (S
5, Yes), and proceeds to step S6. In step S6, it is determined whether the value of the full-open addition counter is the value set in the end management angle width addition switch 11,
Description will be made on the assumption that “0” is set in the end management angle width addition switch 11. Since the value of the full-open addition counter matches the value “0” set in the end management angle width addition switch 11, the value of the angle counter is incremented (S
12), the value of the management angle is calculated (S13). Since the value of the management angle remains “1” and does not change (S14,
(No change), the process ends.

The process shown in FIG. 4 is repeated, and it is determined whether or not the value of the management angle calculated every time the value of the angle counter is incremented (S14). If the management angle has changed (S14, change), the management angle is not at the end (S15, No), there is no stop instruction by the close switch 92 (S16, No), and if it is an intermittent opening / closing operation (S1).
7, Yes), a rectified current is output to the induction motor 7 to perform braking (S18). As described above, the MPU 4 sets the intermittent open / close timer and applies the AC voltage to the induction motor 7 when the flag is set.
Is stopped.

When the control angle changes (S14, change) and the control angle data is "15", that is, when the control angle data is at the end (S15, Yes), an AC voltage is applied to the electromagnetic brake 8 to induce the induction motor. 7 is braked (S20). When the management angle is not at the end (S15, No) and there is a stop instruction by the close switch 92 (S16, Ye)
s) Similarly, an AC voltage is applied to the electromagnetic brake 8 to brake the induction motor 7 (S20). When “1” is set to the end management angle width addition switch 11, if the value of the angle counter is determined to be “2” (S5, Ye
s) The value of the full-open addition counter is compared with the value set in the end management angle width addition switch 11 (S6). Since the value of the full-open addition counter is "0", the value of the full-open addition counter does not match the value set in the end management angle width addition switch 11, and the value of the full-open addition counter is incremented (S7). The process is terminated as it is. Therefore, despite the change in the encoder signal, the value of the angle counter is not incremented, and as shown in FIG. 3 (e), the width of the angle counter value "2" is twice the normal count value. Becomes At this time, the value of the full-open addition counter is updated from “0” to “1” as shown in FIG. As described above, since the change in the encoder signal is not counted for one time, the induction motor 7 is inverted one extra time for the change in the encoder signal.

Next, the opening and closing operation when the height of the blind is above the height set by the upper setting switch 12 will be described. The calculation of the management angle in step S13 is performed based on the management angle data shown in FIG. That is, when the value of the management angle data is between "4" and "12", the increment or decrement is performed by three counts of the angle counter.
Therefore, when the blind is below the upper height set by the upper setting switch 12, the opening and closing of the blade is an intermittent opening and closing operation of 15 steps. It becomes an intermittent opening / closing operation.

As described above, even when the blind is on the upper side and the amount of inertia due to the weight of the blade is large,
The opening and closing angles of the blind blades can be reliably kept within a desired management angle.

Further, by setting the end management angle width addition switch, it is possible to improve the tightness of the blade.

Since the electromagnetic brake is not used at the time of the intermittent opening / closing operation, the operation sound can be made quiet.

FIG. 5 is a flowchart showing a processing procedure of the angle setting operation of the electric blind in the present embodiment. This angle setting operation is performed by the angle setting switch 1001
This is an operation performed when 〜１０1015 is pressed,
An opening / closing angle is determined corresponding to each of the angle setting switches 1001 to 1015.

First, the MPU 4 operates the angle setting switch 10
It is determined whether any of 01 to 1015 has been pressed (S41). Unless an angle setting signal from any of the angle setting switches is input to the MPU 4 (S41, N
o), and proceed to step S51. When the angle setting signal is M
If it is input to the PU 4 (S41, Yes), the current operation of the electric blind is determined (S42). If the current operation of the electric blind is stopped (S42, stopping), the process proceeds to step S44. If the current operation of the electric blind is rotating forward, that is, if the blind is being raised or the blades are being opened (S42, rotating forward), a rectified current is applied to the induction motor 7 to perform DC braking ( S4
3). Then, in step S44, the value of the angle setting operation management counter is set to "1".

In step S42, if the operation of the electric blind is being reversed, that is, if the blind is being lowered or the blade is being closed (S42, being reversed), the stop set angle is set to "15" (fully closed angle). Then, "2" is set to the angle setting operation management counter (S45).

Next, it is determined whether or not the operation of the electric blind is stopped (S51). If the electric blind is in operation (S51, No), the process ends. When the electric blind is stopped (S51, Y
es), the value of the angle setting operation management counter is determined (S52). If the value of the angle setting operation management counter is "0" (S52, 0), the processing is terminated as it is. If the value of the angle setting operation management counter is "1" (S52, 1), the closing operation of the blade is set, the stop setting angle is set to "15", and the value of the angle setting operation management counter is set. It is set to "2" (S53), and the process ends. Also,
If the value of the angle setting operation management counter is "2" (S5)
2, 2), the blade opening operation is set, the stop setting angle is set to the angle setting value set in the command unit 10, the value of the angle setting operation management counter is set to "0" (S54), and the process ends. .

Next, a specific operation when the command section 10 sets "12" as the angle setting value will be described. First, when the angle setting switch 1012 is pressed (S41, Yes), the operation mode is determined (S4).
2). If the electric blind is stopped, "1" is set in the angle setting operation management counter (S44), and it is determined in step S51 that the blind is stopped (S51, Ye).
s) In step S52, the value of the angle setting operation management counter is determined to be "1" (S52, 1).

In step S53, the closing operation of the blade is set, "15" is set as the value of the stop set angle, and the value of the angle setting operation management counter is updated to "2". By setting the closing operation of the blade, the MPU
4 reverses the induction motor 7. Since the encoder signal output from the rotation detecting unit 18 changes due to this inversion operation, the processing of the opening and closing operation shown in FIG. 4 is performed.

Step S1 of the flowchart shown in FIG.
7, the intermittent opening / closing operation is not determined (S17, N
o) In step S19, it is determined whether or not the management angle matches the stop setting angle. Step S53 in FIG.
Since the stop setting angle is set to "15" in the above, the management angle does not match the stop setting angle (S1).
9, disagreement), and terminates the process as it is. By repeating the process shown in FIG. 4, the value of the management angle is incremented, and when the value of the management angle becomes “15”, it is determined in step S15 that the end is located (S15, Y).
es), the induction motor 7 is braked by the electromagnetic brake 8 (S20).

With the above processing, the blade angle is fully closed, and the operation of the electric blind is stopped. Until the blade angle becomes “15”, it is determined that the operation of the electric blind is not stopped in step S51 of the flowchart shown in FIG. 5 (S51, No), and the processing shown in FIG. 5 is not performed. .

When the operation of the electric blind stops (S51, Yes), the value of the angle setting operation management counter is determined to be "2" in step S52 (S52, Yes).
2), the blade opening operation is set, the angle setting value set by the command unit 10 is set to the stop setting angle, and the value of the angle setting operation management counter is cleared (S54).

The MPU 4 rotates the induction motor 7 forward, and performs the processing shown in the flowchart of FIG. 4 every time the encoder signal output from the rotation detector 18 changes. That is, in step S19, the forward rotation operation of the induction motor 7 is repeated until the control angle and the stop set angle match. In this way, when the control angle becomes the stop setting angle “12”, an AC voltage is applied to the electromagnetic brake 8 to brake the induction motor 7.

If the angle setting operation is performed by the command unit 10 while the electric blind is in the inverting operation, it is determined in step S42 in FIG. 5 that the operation mode is in the inverting state (S42, inverting), and the stop setting angle is set. “15” is set, and the value of the angle setting operation management counter is updated to “2”. (S45). That is, the inversion operation currently being performed is continuously performed, and after the inversion operation is completed, the same processing as the above-described processing is performed.

As described above, by setting the angle setting switch, it is possible to always set the management angle "15" to an arbitrary blade angle by the opening operation from the fully closed state.

In the angle setting operation shown in FIG. 5, the opening / closing angle of the blade before the start of the vertical movement is set again, for example, when the blind is stopped after the vertical movement, except when the angle setting value is set by the command unit 10. It can also be applied to the case. That is, this is effective when it is desired to set the opening / closing angle of the blade before the start of raising and lowering the blind after the completion of raising and lowering the blind.

When the blind is on the upper side, as shown in FIG. 3D, the management angle data “2”,
Although “3”, “13”, and “14” do not exist, if these values are set by the command unit 10, the angle set values “2” and “3” are changed to the angle set value “1”.
When the angle setting values are “13” and “14”, the angle setting operation described above can be performed by setting the angle setting value to “15”.

In the above-described embodiment, a DC braking is performed by applying a rectified voltage to the induction motor 7 when the control angle data changes during the opening operation and the closing operation of the blade. However, even when DC braking is performed during the opening operation, the induction motor 7 rotates slowly but in the reverse direction due to the load, that is, in the direction of the closing operation due to the load. DC braking with the next angle counter value at which the value has changed makes it possible to cancel the reverse rotation of the induction motor 7. Therefore, even when the height of the blind at which the load increases is on the upper side, the blind can be reliably stopped within the management angle range. For example, FIG.
As shown in FIG. 3B and FIG. 3D, when the value of the angle counter becomes “28” during the blade opening operation, the value of the management angle data becomes “12”. What is necessary is just to make the value of the management angle data become "12" when it becomes "27". However, when the value of the angle counter becomes the next “26”, the value of the management angle data is changed to “1”.
When 2 "is set, the margin in the management angle range is large, but the inertia force in the rotation direction at the time of stop is also large.
It is not so preferable because the inertial force may exceed the management angle. A setting switch for setting the number of shifts of the management angle data with respect to the angle counter may be provided so that an arbitrary value can be set.

In the above-described embodiment,
By increasing the control angle width on the upper side where the load increases, the intermittent opening and closing is surely within the control angle width, but priority is given to the certainty of operation over suppression of operation noise during intermittent opening and closing operation It is also possible to apply braking. That is, during an intermittent operation in which the height of the blind is on the upper side, a rectified current is applied to the induction motor 7 to perform DC braking, and the electromagnetic brake 8
The application of the AC voltage to the electromagnetic brake 8 is stopped, and braking by the electromagnetic brake 8 is applied.

In the angle setting operation described with reference to FIG. 5, the start angle of the blade is set to the fully closed position.
It may be in the fully open position. Further, a setting switch may be provided so that the operator can select the start angle of the blade from the fully closed position or the fully opened position.

In the opening / closing operation shown in FIG. 4, the processes other than the angle setting operation are intermittent opening / closing operations. However, the induction motor can be continuously opened / closed without DC braking.

Further, as shown in FIG. 3 (e), when "1" is set to the end management angle width addition switch 11, the width when the value of the angle counter is "2" and "29" is increased. Although the width of the other count values is twice as large, the angle counter shown in FIG. 3B is used, and the correspondence between the angle counter and the management angle data is changed to add the fully open counter or the fully closed counter. It is also possible to perform the same processing as the processing using the additional counter.

Although the correspondence between the angle counter and the management angle data is fixed as shown in FIG. 3, the correspondence table is stored in an EEPROM (Electrically Erasable and Prism).
(grammable Read Only Memory), it is possible to set an arbitrary value even after the electric blind is installed.

When the blind is on the upper side,
Although the angular width at the end is not expanded by the fully-open addition counter or the fully-closed addition counter, the same effect can be obtained by performing the same processing as when the blind is on the lower side.

Further, the end management angle width addition switch 11
Are common to the fully open position and the fully closed position, but may be provided separately.

Although the height of the upper side setting by the upper side setting switch 12 is set to 16 steps, it may be set more finely.

Further, the DC braking is performed by applying a rectified current to the induction motor 7 only at the time of the intermittent opening / closing operation. However, the stop at the end of the blade and the stop after the raising / lowering operation of the blind are performed for a certain period of time, for example. It is also possible to perform DC braking for one second and perform braking more effectively in addition to braking by the electromagnetic brake 8.

Further, as a braking method at the time of the intermittent opening / closing operation,
Although DC braking is used, braking may be performed by rotating the induction motor 7 in a reverse direction for a certain time when the rotation of the induction motor 7 is stopped. Also,
Although the same induction motor 7 is used for raising and lowering the blind and opening and closing the blades, different induction motors may be used respectively.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of an electric blind according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a motor drive unit 6 shown in FIG.

FIG. 3 is a diagram illustrating a relationship among an encoder signal, an angle counter, management angle data, a fully open additional counter, and a fully closed additional counter output from a rotation detection unit 18.

FIG. 4 is a flowchart showing a processing procedure of an opening / closing operation of the electric blind in the embodiment of the present invention.

FIG. 5 is a flowchart illustrating a processing procedure of an angle setting operation of the electric blind according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply input part 2 Power supply transformer 3 Stabilization power supply part 4 MPU 5 Zero cross detection part 6 Motor drive part 7 Induction motor 8 Electromagnetic brake 9,10 Command part 11 Edge management angle width addition switch 12 Upper side setting switch 13 Opening / closing drum 14 Blade 15 Ladder coat 16 Bottom rail 17 Lifting tape 18 Rotation detector 19 Disk 20 Photo interrupter 21-24 Triac 25 Diode 71 Reduction mechanism 72 Capacitor for phase advance

Claims (8)

[Claims] 1. An induction motor for opening and closing a plurality of blades by rotation; an instruction unit for instructing an opening operation or a closing operation of the plurality of blades; and a drive for driving and braking the induction motor. Means, an angle detecting means for outputting a detection signal each time the induction motor rotates a predetermined angle, and when the instruction means instructs, the driving means drives the induction motor, and the angle detecting means And a control means for causing the drive means to brake the induction motor when a detection signal output from the motor is detected a predetermined number of times. 2. The control unit includes: a counting unit for counting a detection signal output from the angle detection unit; a calculation unit for calculating a management angle based on a count value of the counting unit; A drive control unit for driving the induction motor to the drive unit when instructed by the instruction unit, and causing the drive unit to brake the induction motor every time the management angle calculated by the calculation unit changes; The electric blind according to claim 1, comprising: 3. The electric blind according to claim 2, wherein the calculating means calculates the management angle based on the counting by the counting means based on a time when the ascent / descent is stopped. 4. The electric blind further includes a height detecting unit for detecting a height of the blind, and an upper-side height setting unit for setting an upper-side height of the blind. The counting means corresponding to the management angle when the height of the blind detected by the height detecting means is above the upper height set by the upper height setting means; When the height of the blind detected by the height detecting means is below the upper side height set by the upper side height setting means, the control angle is increased. 4. The electric blind according to claim 2, wherein a width of a count value of the counting unit corresponding to (b) is narrowed. 5. 5. The drive control means sets the height of the blind detected by the height detection means to the upper-side height setting means when an instruction for an opening operation is issued from the instruction means. When it is on the upper side of the upper side height, the drive means drives the induction motor to detect a detection signal outputted from the angle detection means a predetermined number of times after the management angle calculated by the calculation means changes. The electric blind according to claim 4, wherein the driving unit brakes the induction motor after the driving. 6. The electric blind further includes enlargement instructing means for instructing an enlargement of the opening / closing angle range of the plurality of blades. The electric blind according to any one of claims 2 to 5, wherein the counting is not performed a predetermined number of times at the end of the management angle. 7. The electric blind further comprises: height detecting means for detecting a height of the blind; upper-side height setting means for setting an upper-side height of the blind; and the induction motor. An electromagnetic brake for braking, the drive control means, the height of the blind detected by the height detection means, the upper side of the upper side height set in the upper side height setting means In some cases, when there is an instruction from the instructing means, the driving means drives the induction motor, and each time the control angle calculated by the calculating means changes, the induction motor is applied to the driving means and the electromagnetic brake. The electric blind according to claim 2, wherein the electric blind is braked. 8. The electric blind, further comprising: an angle setting means for setting an opening / closing angle of the plurality of blades; and when the opening / closing angle is set by the angle setting means, first, the electric blind up to a specific end angle. The driving means drives the induction motor, and then drives in the opposite end direction. When the management angle matches the opening / closing angle set in the angle setting means, the driving means brakes the induction motor. The electric blind according to claim 2 or 3, further comprising an angle setting control means for causing the electric blind to be driven.