JPH0639235Y2 - Fan motor speed controller for blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fan motor speed control device of a blower used for speed control of a convection fan in an oil warm air motor, for example.

[Conventional technology]

For example, an oil warm air heater as a blower is equipped with a fan for convection the air in the room, and a fan motor for driving this fan is controlled by a control device provided in the oil warm air heater main body, for example, oil. Speed control is performed according to the output of the warm air heater. Then, as the conventional speed control performed by the control device for the fan motor, ON / OFF control and phase control are known.

The ON / OFF control starts from the zero-cross point where the voltage of the AC power supply becomes 0, and repeats the ON / OFF of the AC power supply alternately with the length of an integral multiple of a half wave (1/2 cycle). Control the power supplied to the fan motor by
This is a control method for controlling the rotation speed of the fan motor. That is, for example, as shown in FIG.
The fan motor speed is controlled by turning on (energizing) for twice the length and then turning off (non-energizing) for twice the half-wave length. Then, in the fan motor, the rotational driving force is generated while the AC power is turned on, but is not generated while the AC motor is turned off. However, since the fan is fixed to the fan motor as a load,
Rotational inertial force is exerted by this fan. Therefore, the above ON / OFF control causes the fan motor to rotate at a certain constant number of rotations.

In general, a control device that performs ON / OFF control has a preset ON time and OFF time of an AC power supply, and by counting signals input from a detection device that detects a zero-cross point, the AC power supply ON / OFF is repeated alternately. Therefore, the above ON / OFF control does not require a timer.

The phase control is, as shown in FIG. 7, triggered after a certain time with reference to the zero-cross point, for example, to conduct a bidirectional thyristor (so-called triac) to turn on the AC power supply to the next zero-cross point, This is a control method for controlling the rotation speed of the fan motor (for example,
(See JP-A-59-142330). Therefore, in phase control, the time to trigger with the zero-cross point as the reference,
That is, by controlling the control angle, the power supplied to the fan motor is turned ON / OFF during a half wave (1/2 cycle).

In this way, in phase control, the power supplied to the fan motor is controlled by repeating ON / OFF during a half wave (1/2 cycle), and in combination with the rotational inertia of the fan itself, Make the rotation speed almost constant.

Then, the control device that performs the phase control needs a timer that controls the time until the trigger is performed on the basis of the zero-cross point.

By the way, generally, as shown in FIG. 9 (a), the oil warm air heater is composed of, for example, an LED and the like, and a display device 18 which is a timer-related means for displaying the room temperature, the set temperature, the time, etc. A timer (not shown) and a timer-related means control means for dynamically driving the display device 18 are provided.

The above dynamic drive is a drive in which the output line of a microcomputer (hereinafter referred to as a microcomputer) to the display device 18 is sequentially switched when the display timer counts up. That is, each time the display timer counts up, 1 is selected from the output lines e to h of the group.
Select one output line, select the output line connected to the LED to be lit from among the output lines a to d of the group, and output by these output lines, the LED corresponding to the display content is lit. It is designed to let you. Then, the above-described operation is sequentially performed for all output lines e to h of the group at a speed of 30 times / second or more, for example,
By repeating at a speed of 100 times / second (in FIG. 9 (b), the output line d of the group, the time width of each pulse is 2.5 msec), desired characters can be displayed by the afterimage effect. ing.

For example, when the group / output lines are sequentially selected as shown in FIG. 9 (b) and the above operation is repeated, 1, 6, 8, 11, The 16th LED is lit. In this case, a timer having a time width of 2.5 msec is used as the display (that is, timer-related means) timer.

[Problems to be solved by the device]

However, in the above ON / OFF control, if the AC / DC power supply is turned on for 5 seconds and then turned off for 1.5 seconds, if the ON / OFF time interval is somewhat long, the rotation speed of the fan motor becomes high. A so-called waviness phenomenon occurs in which the temperature becomes lower or lower. In addition, even if the time interval for turning on / off the AC power supply is short, if the time to turn off is extremely long compared to the time to turn on, or if the time to turn off itself is somewhat long, the fan will rotate smoothly. Will not do.

In this way, the power supplied to the fan motor is controlled by alternately repeating ON / OFF with a length that is an integral multiple of each half wave (1/2 cycle), and this contributes to the rotational inertia of the fan itself. In the control that keeps the fan rotation speed almost constant, there is a limit to the combination of the ON time and the OFF time of the AC power supply.

That is, in the conventional control device that performs only the ON / OFF control,
Starting from the zero-crossing point of the AC power supply, the power supply to the fan motor is controlled by alternately repeating ON / OFF with the length of an integral multiple of each half wave (1/2 cycle). As shown, the rotation speed can be selected only at discrete values. Therefore, there is a problem that the rotation speed cannot be finely controlled to a desired rotation speed.

On the other hand, the conventional control device that performs only phase control has a wide control range and can continuously control the rotation speed of the fan motor as shown in FIG. It is necessary to provide a phase control timer dedicated to phase control. For this reason, the above-mentioned microcomputer must be provided with the phase control timer and the display timer dedicated to the display device 18, which is a timer-related means, which causes a problem of cost increase. .

The present invention has been made in view of the above problems,
The purpose is to provide a microcomputer with a timer, and to use this timer for both phase control and display (for timer-related means) without causing an increase in cost, and
It is an object of the present invention to provide a fan motor speed control device capable of controlling the rotation speed of a fan motor almost continuously.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, a fan motor speed control device for an air blower according to a first aspect of the present invention, in order to solve the above-mentioned problems, a fan motor for driving the fan, and a supply AC power supply in synchronization with the fan motor. A timer is provided for measuring time based on a zero-cross point at which the voltage becomes 0, and timer-related means control means for controlling the operation of the timer-related means based on the timing designated by the timer, and control by the timer-related means control means. And a phase control means for controlling the rotation speed of the fan motor by setting a control angle using the timing designated by the timer. There is.

In order to solve the above-mentioned problems, a fan motor speed control device for a blower device according to a second aspect of the present invention is the fan motor speed control device for a blower device according to claim 1, wherein the rotational inertia force of the fan itself is combined. Therefore, according to the rotation speed of the fan motor, start from the zero-cross point of the AC power supply, and generate ON and OFF waves each of which is an integral multiple of a half wave, so that the rotation speed of the fan becomes almost constant. By controlling the power supplied to the fan motor by repeating it alternately, ON / OFF control means for controlling the speed of the fan motor, and ON / OFF control for the fan motor by the ON / OFF control means The present invention is further characterized by further comprising a main control unit for controlling in combination with the phase control by the phase control unit.

[Action]

According to the configuration of claim 1, the phase control by the phase control means, that is, the control for setting the control angle by using the timing designated by the timer provided in the timer-related means control means for controlling the operation of the timer-related means. By performing the above, it is possible to control the speed of the fan motor almost continuously.

As described above, in the fan motor speed control device, in the blower device in which the operation of the timer-related means is controlled based on the timing specified by the timer of the timer-related means control means, the timer for controlling the operation of the timer-related means is used. Phase control is performed to set the control angle using the designated timing. In this way, since one timer can also be used, it is possible to control the speed of the fan motor almost continuously without providing another timer. As a result, it is possible to provide a fan motor speed control device that can control the rotation speed of the fan motor almost continuously without increasing the cost.

According to the second aspect of the present invention, the main control means controls the ON / O of the fan motor by the ON / OFF control means.
FF control, that is, according to the rotation speed of the fan motor, starting from the zero-cross point of the AC power supply, and alternately repeating an ON wave and an OFF wave each having an integral multiple of a half wave to the fan motor. The ON / OFF control for controlling the power supplied to the fan motor and the phase control by the phase control means are performed together to enable almost continuous speed control of the fan motor.

As described above, in the fan motor speed control device, in the blower device in which the operation of the timer-related means is controlled based on the timing specified by the timer of the timer-related means control means, the ON / OFF control and the timer-related means The phase control for setting the control angle using the timing designated by the timer for controlling the operation is also performed. In this way, since one timer can also be used, it is possible to control the speed of the fan motor almost continuously without providing another timer. As a result, it is possible to provide a fan motor speed control device that can control the rotation speed of the fan motor almost continuously without increasing the cost.

Here, the reason why the timer included in the timer-related means control means can be used both for controlling the operation of the timer-related means and for controlling the phase will be described with reference to FIG. This will be described below.

For example, the output line e of the group shown in FIG. 9 (b)
It is assumed that the time width of each pulse from to h is 3 msec for Hi level and 1 msec for Lo level. That is, the time width of the timing specified by the timer of the timer-related means control means is 1 m.
Assume sec. Then, for example, if a trigger for setting the control angle of the phase control is issued in synchronism with the falling time of each pulse of the output lines e to h,
AC power supply is 1msec, 2msec, measured from the zero cross point.
It will be triggered at the point of 3msec, 4msec.

Here, for example, if the frequency of the AC power supply is 50 Hz, since one cycle of the frequency is 20 msec, the control angle of the phase control at the time of 1 msec, ..., 4 msec measured from the zero-cross point is 18 ° in this order. , 36 °, 54 °, 72 °. That is, since the fan motor is energized from the time point of 1 msec, ..., 4 msec measured from the zero-cross point of half wave (1/2 cycle, 10 msec), the rotation speed of the fan motor can be controlled.

Thus, for example, for display (ie for timer related means)
If the time width of the timer timing is 1 msec,
Since the control angle of phase control can be set by using the above timing, that is, depending on how many msec the measurement is taken from the zero-cross point to trigger, until the trigger is performed with the zero-cross point as the reference. It is possible to eliminate the need for a timer that controls the time (i.e., a timer dedicated to phase control). As a result, the timer can be used for both phase control and display (for timer-related means).

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 2, an oil warm air heater (hereinafter referred to as a fan heater) as a blower has a fan 1 for blowing air and a fan motor 2 for driving the fan 1 on the back of the machine body 9, as shown in FIG. The fan 1 and the fan motor 2
Is covered with a fan guard 3 having a large number of openings 3a ... A combustion chamber 4 is formed inside the machine body 9, and a burner 5 for heating air is provided in the combustion chamber 4. Above the combustion chamber 4,
A wind direction plate 6 is provided to guide the air sent by the fan 1 and the heated air sent out from the combustion chamber 4 toward the front surface of the machine body 9. A louver 7 serving as a hot air outlet is provided on the front surface of the machine body 9. Further, on the upper part of the machine body 9, there is provided a display device 8 as a timer-related means for displaying the room temperature, the set temperature, the time and the like.

Further, the fan heater includes an ON / OFF control means 10 as shown in FIG. The ON / OFF control means 10 adjusts the voltage of the AC power supply according to the rotation speed of the fan motor 2 so that the rotation speed of the fan 1 becomes almost constant in combination with the rotation inertial force of the fan 1 itself. The power supplied to the fan motor 2 is controlled by starting from the zero-cross point where it becomes 0 and alternately repeating an ON wave and an OFF wave each having an integral multiple of a half wave (1/2 cycle). Thus, the number of rotations of the fan motor 2 is maintained at a predetermined number of rotations on average. In the ON / OFF control by the ON / OFF control means 10, a plurality of rotation speeds can be selected by changing the lengths of the ON wave and the OFF wave.

Further, the fan heater includes a timer that measures time with the zero-cross point as a reference in synchronization with the AC power supply, and timer-related means control means for controlling the operation of the display device 8 based on the timing designated by this timer.
12 and a display device 8 as timer-related means controlled by the timer-related means control means 12.

Further, the fan heater includes a phase control means 13.
The phase control means 13 controls the rotation speed of the fan motor 2 by issuing a trigger by using the timing designated by the timer and setting a control angle for phase control.

Further, the fan heater controls the fan motor 2 by the ON / OFF control means 10 and the phase control means.
Main control means to control in combination with phase control by 13
Equipped with 14.

The timer-related means control means 12 is the display device 8 described above.
Is dynamically driven based on the timing designated by the timer to display the room temperature, the set temperature, and the like. A microcomputer (hereinafter, referred to as a microcomputer) 11 is composed of the ON / OFF control means 10, the timer-related means control means 12, the phase control means 13 and the main control means 14. This microcomputer 11
Has other functions necessary to control the operation of the fan heater. The microcomputer 11 constitutes a fan motor speed control device.

In the above configuration, in the ON / OFF control by the ON / OFF control means 10, the rotational speed of the fan 1 becomes substantially constant in combination with the AC power supplied to the fan motor 2 together with the rotational inertia force of the fan 1 itself. As described above, according to the rotation speed of the fan motor 2, starting from the zero-cross point of the AC power supply and alternately repeating ON waves and OFF waves each having an integral multiple length of a half wave (1/2 cycle). Controlled by. As a result, the rotation speed of the fan motor 2 is maintained at a predetermined rotation speed on average.

Further, in the timer-related means control means 12, the dynamic drive for sequentially switching the output line of the microcomputer 11 to the display device 8 is performed based on the timing designated by the timer, as described in detail in the above-mentioned prior art. There is. Then, the phase control means 13 sets the control angle of the phase control by utilizing the timing designated by the above-mentioned timer, that is, depending on the time point when the measurement is performed from the zero-cross point and the trigger is issued. In this way, the rotation speed of the fan motor 2 is controlled by setting the control angle of the phase control.

In the present fan heater, the main control means 14 performs speed control on the fan motor 2 by combining ON / OFF control by the ON / OFF control means 10 and phase control by the phase control means 13. For example, in FIG. 3, the range indicated by A is phase control, and the range indicated by B is ON / O.
It is FF control. Therefore, the rotational speed of the fan motor 2 is controlled substantially continuously from a practical point of view, as shown in FIG.

That is, if only the ON / OFF control by the ON / OFF control means 10 is selected, the number of revolutions that can be selected is limited to several, but by controlling the phase control by the phase control means 13 in combination, By / OFF control, it is possible to perform fine control that fills the gap between the discrete rotation speeds that can be selected. Also,
The phase control means 13 uses the timing designated by the timer to issue a trigger and set the control angle for phase control. Therefore, a timer dedicated to the phase control is unnecessary.

To control the rotation speed of the fan motor 2, turn it ON / OFF.
There are three possible methods: control, phase control, and control that combines ON / OFF control and phase control. Then, in order to control the rotation speed of the fan motor 2 substantially continuously from a practical point of view, a) ... Is appropriately combined to perform speed control, b). Is appropriately combined to perform speed control, and c). Three types of control methods are conceivable: speed control is performed by appropriately combining and speed control is performed by appropriately combining d). Of course, a case where the supply power is not cut off by ON / OFF control or phase control (so-called continuous operation) is also conceivable, and the fan motor 2 can be operated by this method. Further, depending on the number of rotations of the fan motor 2, it is possible to control the speed only by the method, only by the method, or only by the method.

Further, in this fan motor speed control device, the timer is also used for phase control and display (for timer-related means), so the above-mentioned timer actually specifies timing suitable for both applications. Will be done.

[Effect of device]

As described above, the fan motor speed control device for an air blower according to the first aspect of the present invention, in synchronization with the fan for blowing air, the fan motor for driving the fan, and the AC power supply,
A timer for measuring time with a zero cross point at which the voltage becomes 0 as a reference is provided, and the timer-related means control means for controlling the operation of the timer-related means based on the timing designated by the timer and the timer-related means control means. An air blower equipped with controlled timer-related means is provided with phase control means for controlling the rotation speed of a fan motor by setting a control angle using the timing designated by the timer. .

Therefore, it is possible to control the speed of the fan motor almost continuously without providing another timer. Therefore,
It is possible to provide a fan motor speed control device that can control the rotation speed of the fan motor almost continuously without increasing the cost.

As described above, the fan motor speed control device for a blower device according to the second aspect of the present invention is such that the fan motor rotation speed is substantially constant in combination with the rotation inertial force of the fan itself. According to the above, the power supplied to the fan motor is controlled by starting from the zero-cross point of the AC power source and alternately repeating ON waves and OFF waves each having an integral multiple of half wave length, thereby An ON / OFF control unit for controlling the speed of the motor and a main control unit for controlling the fan motor by combining the ON / OFF control by the ON / OFF control unit and the phase control by the phase control unit are further provided. This is the configuration provided.

Therefore, it is possible to control the speed of the fan motor almost continuously without providing another timer. Therefore,
It is possible to provide a fan motor speed control device that can control the rotation speed of the fan motor almost continuously without increasing the cost.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a block diagram showing a configuration of a fan motor speed control device of a blower, and FIG. 2 is shown in FIG. Explanatory drawing showing the structure of an oil warm air heater equipped with a fan motor speed control device, FIG. 3 is a waveform diagram showing an example of speed control by this fan motor speed control device, and FIG. 4 is the speed of this fan motor speed control device 6 is a graph showing the relationship between the number of revolutions in control and the ON time of power supply to the fan motor. FIGS. 5 to 9 show a conventional example.
The figure is a waveform diagram showing an example of speed control by ON / OFF control, and Fig. 6 is a graph showing the relationship between the rotation speed of the fan motor and the ratio of the ON time of power supply to the fan motor in ON / OFF control
FIG. 7 is a waveform diagram showing an example of speed control in phase control, and FIG. 8 is a graph showing the relationship between the rotation speed of the fan motor and the ON time of power supply to the fan motor in phase control.
FIG. 9A is an explanatory diagram for explaining the dynamic drive of the display device, and FIG. 9B is a waveform diagram for explaining the dynamic drive of the display device. 1 is a fan, 2 is a fan motor, 8 is a display device (timer-related means), 10 is ON / OFF control means, 11 is a microcomputer, 12 is timer-related means control means, 13 is phase control means, and 14 is main control. It is a means.

Claims (2)

[Scope of utility model registration request] 1. A fan for blowing air, a fan motor for driving the fan, and a timer for measuring time based on a zero-cross point at which the voltage becomes 0 in synchronization with an AC power supply, which is designated by the timer. In a blower device comprising timer-related means control means for controlling the operation of the timer-related means based on the timing, and timer-related means controlled by the timer-related means control means, the timing specified by the timer is A fan motor speed control device for a blower, comprising phase control means for controlling a rotation speed of a fan motor by setting a control angle using the fan motor. 2. A half-wave starting from the zero-cross point of the AC power supply according to the rotation speed of the fan motor so that the rotation speed of the fan becomes almost constant in combination with the rotation inertial force of the fan itself. The ON / OFF control means for controlling the power supply to the fan motor by alternately repeating the ON wave and the OFF wave, each of which has an integral multiple length, and the fan motor ON / O by the above ON / OFF control means
The fan motor speed control device for a blower according to claim 1, further comprising a main control means for controlling the FF control and the phase control by the phase control means in combination.