JP2012220100A - Operation control device of range hood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation control device of a range hood configured to reduce a torsion shock to be applied to a DC motor at the start and stop of the DC motor provided in a blower of the range hood.SOLUTION: The DC motor 11 for rotating a fan 12 of the blower 10 is controlled by a speed command voltage at the start and stop thereof, the speed command voltage is increased stepwise at the start-up, and lowered stepwise at shut down, to reduce the torsion shock applied to the DC motor 11 at the start and stop thereof.

Description

  The present invention relates to an operation control device for a range hood that operates and stops the range hood by starting and stopping a DC motor that rotates the fan of the range hood, and rotating and stopping the fan.

A range hood is generally provided with a hood and a blower that rotates a fan with a motor, and the fan is rotated with the motor to collect air in the hood and discharge it outdoors.
In recent years, in order to save energy, range hoods have also adopted DC motors as the motors for the above-mentioned blowers. By inputting the speed command voltage to the motor drive circuit, the supply voltage to the DC motor is controlled and the DC motor is driven. It is made to control (refer patent document 1).

JP 2010-236803

Since the range hood discharges a large amount of air to the outdoors, a large amount of air blower is used. Therefore, the fan of the blower is large and the fan is made of iron, so the fan is heavy (heavy).
For this reason, the DC motor is driven at a high torque in order to rotate the heavy fan, and an excessive force (a large twisting force) is applied to the DC motor at the start of rotating the fan and at the stop of stopping the rotating fan. If this is repeated several times, the anti-vibration rubber provided on the rotor (rotor) of the DC motor is scraped, and the resistance to the torsional impact of the anti-vibration rubber is reduced, and the DC motor is started and stopped. Occasional noises sometimes occurred.

  An object of the present invention is to provide an operation control device for a range hood capable of reducing twisting shock applied to a DC motor at the time of starting to start the rotation of the fan by the DC motor and at the time of stopping to stop the rotating fan. is there.

As a result of researches and experiments on the fact that a large twisting impact is applied to the DC motor at the time of start and stop, the present inventors have found the following and have reached the present invention.
The conventional range hood operation control device increases the speed command voltage from zero to a target value that matches the target rotational speed at the time of startup, and decreases the speed command voltage to zero at the time of stop. It was found that a large twisting impact is applied to the DC motor because the speed command voltage changes abruptly when the motor is stopped.
Paying attention to this, when the speed command voltage is gradually increased from zero to the target value at the start, and when the speed command voltage is gradually decreased to zero at the time of stop, it is found that the twisting shock applied to the DC motor is reduced. The present invention has been reached.

The first invention includes a hood 1, a blower 10 that rotates a fan 12 with a DC motor 11, a control unit 30 that controls a speed command voltage for starting and stopping the DC motor 11, and the control unit 30 is operated. A driving operation unit 20 for inputting a signal and a stop signal;
The control unit 30 performs control to increase the speed command voltage stepwise when the DC motor 11 is started, and performs control to decrease the speed command voltage stepwise when the DC motor 11 is stopped. This is a range hood operation control device.

  In the first invention, the control unit 30 can increase the speed command voltage within several seconds when the DC motor 11 is started, and can decrease the speed command voltage in a shorter time than when the DC motor 11 is stopped.

In this way, since the DC motor 11 is started and the range hood starts operating within a few seconds after the driving operation unit 20 is operated, the user does not feel uncomfortable at the time of starting.
In addition, the time from when the driving operation unit 20 is stopped to when the DC motor 11 stops is shorter than the time from when the start operation is performed to when the DC motor 11 is started, and the user does not feel uncomfortable at the time of stop. The range hood can be operated without causing any trouble even if the operation unit 20 is stopped and then immediately operated again.

  In the first aspect of the invention, the magnitude of the one-step rising of the speed command voltage can be set to the largest value at which no back electromotive force is generated in the motor current of the DC motor 11.

  In this way, when the DC motor 11 is started, the twisting impact applied to the DC motor 11 can be reduced to a practically non-problematic level, and the anti-vibration rubber 16 of the DC motor 11 can be scraped even after long-term use. Durability is improved.

The second invention includes a hood 1, a blower 10 that rotates a fan 12 with a DC motor 11, a control unit 30 that controls a speed command voltage for starting and stopping the DC motor 11, and an operation performed by the control unit 30. A driving operation unit 20 for inputting a signal and a stop signal;
The control unit 30 performs control to sequentially increase the speed command voltage linearly when the DC motor 11 is started, and performs control to sequentially decrease the speed command voltage linearly when the DC motor 11 is stopped. This is a hood operation control device.

  In the second invention, the time when the speed command voltage is sequentially increased linearly is within several seconds, and the time when the speed command voltage is sequentially decreased can be made shorter than the time when the speed command voltage is sequentially increased linearly.

In this way, since the DC motor 11 is started and the range hood starts operating within a few seconds after the driving operation unit 20 is operated, the user does not feel uncomfortable at the time of starting.
In addition, the time from when the driving operation unit 20 is stopped until the DC motor 11 stops is short, and the user does not feel uncomfortable at the time of stopping. The range hood can be operated without causing any problems even if operated.

According to the first aspect of the invention, the speed command voltage gradually increases stepwise when starting, and gradually decreases when stopping, so that the fan that is rotating at start-up when the DC motor 11 starts rotating the fan 12 is started. The twisting impact applied to the DC motor 11 can be reduced when the motor is stopped.
According to the second aspect of the invention, the speed command voltage increases linearly sequentially at the time of startup and decreases linearly at the time of stop. Therefore, when the fan 12 starts rotating by the DC motor 11, the rotating fan 12 is It is possible to reduce twisting impact on the DC motor 11 when stopping.

It is a schematic explanatory drawing of a range hood. It is a drive control circuit diagram of a DC motor. It is explanatory drawing which shows the speed command voltage and motor current at the time of the strong start of a DC motor. It is explanatory drawing which shows the speed command voltage and motor current at the time of a stop of a DC motor. It is explanatory drawing which shows the speed command voltage and motor current at the time of the strong start of the DC motor in 2nd Embodiment. It is explanatory drawing which shows the speed command voltage and motor current at the time of the stop of the DC motor in 2nd Embodiment. It is explanatory drawing which shows the speed command voltage and motor current at the time of the stop of the DC motor in 3rd Embodiment. It is explanatory drawing which shows the speed command voltage at the time of starting of the DC motor in 4th Embodiment, and a stop.

As shown in FIG. 1, the range hood of the present invention includes a hood 1, a blower 10, and an operation operation unit 20, and operates the operation operation unit 20 to drive the blower 10, thereby producing oily smoke generated during cooking. Is collected in the hood 1 and discharged outdoors.
The hood 1 has a box shape in which a lower surface is opened by an upper surface plate 2 and a peripheral surface plate 3, and a filter 4 and a current plate 5 are provided in the hood 1.
The blower 10 rotates a fan 12 with a DC motor 11, and the fan 12 is provided in a fan case 13. The DC motor 11 is attached to the fan case 13, and the suction port 12 a is rotated by the rotation of the fan 12. The air is sucked in and discharged to the discharge duct 14.
In the DC motor 11, a vibration isolating rubber 16 is provided on the rotor 15, and a motor shaft 17 is connected to the fan 12.
The driving operation unit 20 is provided on the front surface 3 a of the peripheral plate 3 of the hood 1.

Next, the operation control device will be described.
As shown in the drive control circuit diagram shown in FIG. 2, the DC motor 11 has the rotor 15, drive coil 18, and position detection means (Hall element) 19.
The driving operation unit 20 includes a strong driving operation unit such as a strong button 21, a middle driving operation unit such as a middle button 22, a weak driving operation unit such as a weak button 23, and a stop operation unit such as a stop button 24. By operating one button, a strong operation signal, a medium operation signal, a weak operation signal, and a stop signal are output to the controller (microcomputer) 30.
The control unit 30 outputs a speed command voltage based on the input signal to the motor control circuit 40 to start / stop the DC motor 11.
The motor control circuit 40 controls the motor drive circuit 50 based on the input speed command voltage, and controls the voltage supplied to the DC motor 11 (drive coil 18).
The motor drive circuit 50 is supplied with a DC power source obtained by rectifying the AC power source of the AC power source 60 by the rectifying unit 70.
The motor drive circuit 50 is provided in the DC motor 11, but may be provided outside the DC motor 11.

The control unit 30 receives the speed command voltage when any one of the strong operation signal, the intermediate operation signal, and the weak operation signal is input from any one of the strong button 21, the middle button 22, and the weak button 23. Is output to the motor control circuit 40 so as to increase stepwise from zero to the target value.
For example, when a strong operation signal is input to the control unit 30 by operating the strong button 21, the speed command voltage is increased from zero to a target value in three stages as shown in FIG.

Thus, by increasing the speed command voltage from zero to the target value in three stages at the time of startup, the twisting impact applied to the DC motor 11 at the time of startup could be reduced.
In FIG. 3A, the target value of the speed command voltage is smaller than the set value at which the set speed can be obtained, and the rotation of the rotor 15 is detected by the position detecting means 19 after starting and sent to the motor control circuit 40. Thus, the speed command voltage is corrected to a set value, and the DC motor 11 is rotated at the set speed.
The target value may be set as the set value.

  In FIG. 3A, the time t1 for outputting the first speed command voltage, the time t2 for outputting the second speed command voltage, and the time t3 for outputting the third speed command voltage are for reducing the twisting impact. The longer the time, the longer it takes to start the DC motor 11 after the strong button 21 is pressed (the time required for starting), and the user of the range hood feels uncomfortable. 2 seconds are set to be within a few seconds so that a person does not feel uncomfortable.

When the DC motor 11 is driven by the normal control shown in FIG. 3 and the range hood is operated, when the stop button 24 is operated and the stop signal is input to the control unit 30, the control unit 30 displays the speed command. The voltage is output to the motor control circuit 40 so that the voltage gradually decreases from the set value to zero.
For example, as shown in FIG. 4A, the torsional impact applied to the DC motor 11 when stopped can be reduced by lowering the speed command voltage from the set value to zero in three steps.

In FIG. 4A, the time t2 for outputting the first speed command voltage, and the time t2 for outputting the second speed command voltage are shorter than the above-described startup times (t1, t2, t3). For example, 0.5 seconds.
As a result, the time required for the stop is shorter than the time required for the start. Therefore, after the stop operation is performed by operating the stop button 24, one of the strong button 21, the middle button 22, and the weak button 23 is immediately operated. Even when the operation is performed, the DC motor 11 can be started from a stopped state.

  In other words, the user of the range hood may operate the operation button immediately after operating the stop button 24 to restart the range hood. If the time required for the stop is long, the user restarts the operation as described above. In this case, the DC motor 11 is restarted before it stops, and various problems may occur. Therefore, even if the time required for the stop is shortened as described above and restarted as described above, the problem occurs. The range hood can be driven without causing any problems.

  By controlling the speed command voltage as shown in FIGS. 3 (a) and 4 (a) at the time of start and stop, the twisting shock applied to the DC motor 11 at the time of start and stop can be reduced. However, the present inventors aimed to further improve the durability of the range hood, and as a result of repeating the start and stop of the range hood more and more, the anti-vibration rubber 16 provided in the DC motor 11 was shaved, and the anti-vibration rubber 16 The resistance to torsional impact was reduced, and abnormal noise was sometimes generated during DC motor operation.

  In order to find the cause of this, the present inventors measured the current of the motor power supply (VM) when the DC motor 11 was started up. As a result, the waveform shown in FIG. When A is large as in A), a counter electromotive force (-current) (B) is generated in the motor current, and a force to stop the DC motor 11 is generated. It was found that the anti-vibration rubber 16 could be scraped off without being reduced to a level where there was no problem.

  Similarly, when the current of the motor power source (VM) when the DC motor 11 is stopped is measured, the waveform shown in FIG. 4B is shown, and the falling of the speed command voltage is large as shown in (C), and the speed Since the back electromotive force (B) is generated in the motor current due to the short time t1 and t2 during which the command voltage is output, the twisting shock applied to the DC motor 11 cannot be reduced to a practically no problem level as in the start-up. The anti-vibration rubber 16 was found to be scraped off.

Next, an embodiment in which the twisting impact applied to the DC motor 11 at the time of starting and stopping can be reduced to a level that does not cause a problem in practice.
When the strong button 21 is operated to input a strong operation signal to the control unit 30, the speed command voltage rise (A) as shown in FIG. 5 (a) and the motor current as shown in FIG. 5 (b). The largest value at which no back electromotive force is generated.
As a result, the speed command voltage is increased from zero to the target value in four stages.
At this time, the time t1, t2, t3, t4 for outputting the speed command voltage in one stage is 2 seconds.

  By doing so, no back electromotive force is generated in the motor current when the DC motor 11 is started, so that the anti-vibration rubber 16 is not scraped off by the twisting shock applied to the DC motor 11 and the twisting shock. Can be reduced to a level where there is no practical problem.

When the DC motor 11 is started as shown in FIG. 5A and the DC motor 11 is driven under normal control, the stop button 24 is operated to input a stop signal to the control unit 30. As shown in FIG. 6 (a), the control unit 30 sets the speed command voltage to fall (C) as shown in FIG. 6 (b), and reduces the back electromotive force of the motor current as shown in FIG. 6 (b). To do.
For this reason, since the fall (C) of the speed command voltage is small, the speed command voltage is lowered from the set value to zero in three stages.
At this time, the time t1, t2, t3 for outputting the speed command voltage in one stage is 0.5 seconds, and the time required for stopping is shortened to 1.5 seconds.

  In short, since it is necessary to shorten the time required for stopping as described above, the magnitude of the fall (C) of the speed command voltage causes a counter electromotive force to be generated in the motor current. The time required for stopping can be shortened, and the twisting impact of the DC motor 11 can be reduced.

It should be noted that back electromotive force may not be generated in the motor current when stopped. For example, as shown in FIG. 7, when the speed command voltage is shown in FIG. 7 (a), the fall (c) of the speed command voltage is changed, and the counter electromotive force of the motor current is shown in FIG. 7 (b). The largest value that does not occur.
As a result, the speed command voltage is increased from zero to the target value in four stages.
At this time, the time t1, t2, t3, t4 for outputting the speed command voltage in one stage is 2 seconds.

In each of the above-described embodiments, the speed command voltage is increased and decreased stepwise, but the speed command voltage may be increased and decreased linearly sequentially.
For example, when an operation signal is input to the control unit 30, the control unit 30 sequentially increases the speed command voltage linearly from zero to a target value (set value) at a predetermined time t5 as shown in FIG.
When the stop signal is input to the control unit 30, the control unit 30 sequentially decreases the speed command voltage from the set value to zero at a predetermined time t6 as shown in FIG.
At this time, the predetermined time t5 for rising is within several seconds, and the predetermined time t6 for falling is shorter than this time t5 so that the time required for stopping is shorter than the time required for starting.

  In this way, the speed command voltage increases linearly at the time of startup and decreases linearly at the time of stop, so that the twisting impact can be reduced.

  3 to 8, the speed command voltage and the motor current change in a fine sawtooth shape, but are shown as one line for easy understanding.

  DESCRIPTION OF SYMBOLS 1 ... Hood, 10 ... Blower, 11 ... DC motor, 12 ... Fan, 15 ... Rotor, 16 ... Anti-vibration rubber, 17 ... Motor shaft, 20 ... Driving operation part, 30 ... Control part, 40 ... Motor control circuit, 50: Motor drive circuit.

Claims (5)

A hood 1, a blower 10 that rotates a fan 12 with a DC motor 11, a control unit 30 that controls a speed command voltage for starting and stopping the DC motor 11, and an operation signal and a stop signal are input to the control unit 30 A driving operation unit 20 for
The control unit 30 performs control to increase the speed command voltage stepwise when the DC motor 11 is started, and performs control to decrease the speed command voltage stepwise when the DC motor 11 is stopped. Range hood operation control device.   2. The range hood according to claim 1, wherein the control unit increases the speed command voltage within several seconds when the DC motor is started, and decreases the speed command voltage within a shorter time than when the DC motor is stopped. Operation control device.   The operation control device for a range hood according to claim 1 or 2, wherein the magnitude of one-stage rising of the speed command voltage is the largest value at which no back electromotive force is generated in the motor current of the DC motor 11. A hood 1, a blower 10 that rotates a fan 12 with a DC motor 11, a control unit 30 that controls a speed command voltage for starting and stopping the DC motor 11, and an operation signal and a stop signal are input to the control unit 30 A driving operation unit 20 for
The control unit 30 performs control to sequentially increase the speed command voltage linearly when the DC motor 11 is started, and performs control to sequentially decrease the speed command voltage linearly when the DC motor 11 is stopped. Operation control device for hood.   5. The operation control device for a range hood according to claim 4, wherein a time when the speed command voltage is sequentially increased linearly is within a few seconds, and a time when the speed command voltage is sequentially decreased is shorter than a time when the linear instruction is sequentially increased.

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