JP2003169489A - Control method of fan motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for controlling the amount of ventilating air with high accuracy even when there are variations in the rotational torque of a voltage control type fan motor. <P>SOLUTION: In the test of apparatus with an assembled fan motor 21, when given control data is outputted from a control circuit 18 so that an applied voltage for ventilating the prescribed amount of air can be obtained by the operation of fan motor 21, the actually obtaining amount of ventilation air is measured by external air amount measurement equipment 24 temporally used only at the test. The measured amount of air is transmitted to the control circuit 18 and stored in a nonvolatile memory means 22 connected to the control circuit 18. Under the actual operation of the apparatus, the standard amount of air to be obtained when the prescribed control data is outputted from the control circuit is set at the designed amount of air. The value of control data outputted from the control circuit 18 is compensated according to the difference between the designed amount of air and the measured amount of air stored in the nonvolatile memory means 22. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor control method suitable for highly accurately controlling the amount of air flowing by the fan motor in a control system for controlling the fan motor by voltage driving.

[0002]

2. Description of the Related Art Generally, in controlling a voltage-controlled fan motor for controlling an intake air amount or an air supply amount (generally, a circulating air amount) to a combustion portion of a combustion device, a voltage applied to the fan motor is used. Then, in consideration of the rotation speed at that time, there is a system for controlling the distribution air quantity to be a desired value by a voltage-rotation speed control function when a predetermined distribution air quantity is obtained.

[0003]

However, in this method, even if the control system itself can function with high accuracy, if there is variation in the rotational torque of the fan motor itself, variation in the actual circulating air amount control also occurs. Therefore, it may be necessary to adjust the circuit here by volume etc., which will increase the cost, and in the end,
It is hard to say that such conventional method is the best solution.

The present invention has been made in view of this point,
Even if the voltage-controlled fan motor itself has variations such as rotational torque, it is still possible to provide a method that enables highly accurate control of the amount of circulating air through voltage control of the fan motor. .

[0005]

In order to achieve the above object, the present invention provides a voltage control type fan motor control method for controlling an applied voltage for controlling the amount of circulating air; Externally used only during the test when control data of the specified value is output from the control circuit so that the applied voltage value is such that the specified amount of air flows when the fan motor operates during the test. The amount of circulating air actually obtained is measured by the air amount measuring device of the above; the measured amount of measured air is transmitted to the control circuit and stored in the non-volatile storage means connected to the control circuit; , The specified air amount to be obtained when the control data of the specified value is output from the control circuit as described above is set as the design air amount, and this and the measured air amount stored in the non-volatile storage means Suggest fan motor control method comprising; view of compare the difference, to correct the value of the control data output by the control circuit.

In the above structure, instead of storing the measured air amount in the nonvolatile storage means, the difference may be calculated in advance and the difference may be stored, or the difference may be stored. Instead of the above, a correction coefficient obtained based on the difference may be stored, and the value of the control data output from the control circuit may be corrected by this correction coefficient.

In addition to the above structure, the measured air amount is transmitted to the control circuit by operating an operation member attached to a remote controller (hereinafter, simply referred to as a remote controller) connected to the device in a predetermined manner. In particular, it is most advantageous and ideal in terms of cost that the operating member is the one used by the user to instruct the operation of the device under normal operation of the device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a voltage control device for a fan motor 21 constructed by applying the present invention. First, to explain the good parts of the existing configuration, the fan motor
In the case of the drawing, the control circuit 18 that controls the applied voltage of 21 is assumed to control the entire combustion equipment. However, only the part relating to the present invention will be described below. This control circuit 18 determines the voltage to be applied to the fan motor 21 in a combustion device incorporating the present control device so that the optimum fan motor rotation speed is obtained according to the combustion amount at each time, and a constant voltage drive circuit. The control data for outputting the voltage is sent to 15. The control data may be a general N-bit binary numerical value, or may be an electric signal in which a digital value is replaced with a pulse width, such as one according to PWM (pulse width modulation). It may be a frequency-modulated signal or the like in which the frequency is replaced. Also,
Before being sent to the constant voltage drive circuit 15, an analog value corresponding to the digital value output from the control circuit 18 may be sent by a D / A converter (not shown).

The constant voltage drive circuit 15 has a circuit configuration corresponding to these according to the existing technology. The circuit 15 controls the control circuit 18 to output an output voltage to be applied to the fan motor 21 from time to time. The switching transistor 12 is turned on and off at a cycle (pulse width) determined at each time, whereby the current from the fan motor driving DC power supply 11 is supplied to the capacitor in the smoothing circuit 14 when the power transistor 13 is on. Since it flows in and flows out when it is turned off, the voltage applied to the fan motor 21 is also a considerably stable voltage when viewed on an average on the time axis. In addition, as it is for each of the following circuits,
Generally, the control circuit 18 can be substantially realized by a microcomputer (hereinafter simply referred to as a microcomputer).
An interface inserted between the external circuit and the external circuit as necessary is not shown. Those skilled in the art can use any necessary interface.

On the other hand, the voltage actually applied to the fan motor 21 from time to time is detected by the voltage detection circuit 16 and fed back to the constant voltage drive circuit 15, and the fan motor 21 is also driven.
The actual rotation speed of 21 is the rotation speed detection circuit (rotation speed sensor) 17
Is detected by and returned to the microcomputer 18. In this way, feedback control is performed to obtain the number of rotations of the fan motor 21 required at each time, and the voltage applied to the fan motor 21 is feedback controlled.

However, as described above, the voltage detection circuit 16 incorporated in the control device is often unavoidably a simple circuit due to cost constraints, and the detection accuracy is often too high. In the first place, because the fan motor 21 itself has variations, even if the feedback control system itself can function with high accuracy, the voltage applied to the fan motor 21 can be controlled with high accuracy for the purpose of controlling the ideal amount of circulating air. There was something I couldn't do.

Therefore, in the present invention, the following method is adopted. First, an external air amount measuring device 24 is prepared at a stage before shipment of the control device, for example, at a manufacturing stage. If this air amount measuring device 24 is connected, the control circuit 18 outputs control data of a specified value, and at this time, the actually controlled circulating air amount is measured by the measuring device 24 and measured. The amount of air is transmitted to the control circuit 18 and stored in the non-volatile storage means 22 connected to the control circuit 18. This is not a limitation, but regarding the measurement of this circulating air volume,
Generally, there is an orifice method as a method used for such measurement in various fields, and in many cases, a method of calculating an air volume by a pressure difference between an inlet side and an outlet side of a flow passage having a specified hole diameter is adopted. The air amount measuring device 24 may be configured with such a differential pressure detecting device.

Further, the communication means from the air quantity measuring device 24 to the control circuit 18 may be any, but not limited to, any suitable interface may be used, but it is advantageous to use the remote controller 19 attached to this kind of combustion equipment. It is a method. In other words, the remote control is used recently for the user to instruct the operation of the device such as the start and stop of combustion and the adjustment of the combustion amount. Such commands are issued by operating the operating members. Therefore, when the present invention is applied to a combustion device having a remote controller as described above, the measured circulating air amount information is delayed to the control circuit 18 by operating the operation member used for various commands in a predetermined manner. According to this structure, no additional communication means is required, which is extremely advantageous in terms of cost. The operating member may be dedicated for inputting the measured air amount, but as described above, it is much cheaper and cheaper to use the operating member used for various commands.

However, in the above measurement, the control circuit
As shown in Fig. 2, the standard value output from 18 is the standard design air amount (design air amount) AIRnom (D
sgn) is the value to be output. On the other hand, the air quantity measuring device
The measured air amount measured by 24 and stored in the non-volatile storage means 22 is generally more or less, and becomes AIRnom (Real) with an error ER = Enom with respect to the design air amount.

Therefore, under actual operation of the device, such measured air amount AIRnom (Real) and the design air amount AIRn to be compared with it are compared.
It is preferable to correct the control data output from the control circuit in consideration of the difference Enom from om (Dsgn). For example, in FIG.
When the control data generated by the control circuit for controlling the predetermined design air amount is the output digital value Bn-nom, the measured air amount is stored in the non-volatile storage means 22. Then, for each circulating air amount required at that time, if correction is performed based on the difference Enom between the design air amount at the time of measurement and the actually measured measured air amount,
The error at that time can be suppressed to a very small level,
As a result, it is possible to control the applied voltage for highly accurate air amount control.

Of course, the measured air volume is stored in the nonvolatile storage means.
Instead of being stored in 22, the difference between the design air amount and Enom
Is calculated and this difference Enom is stored, and based on this, the control data at that time may be corrected.
Even if the correction coefficient obtained based on Enom is stored and the value of the control data output from the control circuit is corrected by this correction coefficient, the same effect can be obtained.

[0017]

According to the present invention, even if the voltage-controlled fan motor itself has variations in rotational torque and the like, it is possible to control the amount of circulating air based on highly accurate voltage control, and to input the measured amount of air. If the normal operation member of the remote controller is diverted to the above, the cost increase by applying the present invention can be minimized.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a voltage control device applied to a fan motor to which the present invention is applied.

FIG. 2 is an explanatory diagram for explaining a relationship for correcting output data from a control circuit in terms of characteristics in the present invention.

[Explanation of symbols]

11 DC power supply 15 Constant voltage drive circuit 16 Voltage detection circuit 17 Speed detection circuit 18 Control circuit (microcomputer) 21 Fan motor (Voltage control type fan motor) 22 Non-volatile storage means 23 External air flow meter

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Claims (5)

[Claims] 1. A voltage control type fan motor control method for controlling an applied voltage for controlling a circulating air amount;
When the control circuit outputs the control data of a specified value so that the applied voltage value allows a specified amount of air to flow by the operation of the fan motor during the test of the device incorporating the fan motor, An external air flow meter, which is used only temporarily during the test, measures the actual flow air flow obtained; the measured air flow is transmitted to the control circuit, and the nonvolatile circuit connected to the control circuit is used. It is stored in the storage means; in actual operation of the device, the specified air amount that should be obtained when the control data of the specified value is output from the control circuit is set as the design air amount, and this and the nonvolatile A fan motor control method comprising: correcting the value of the control data output from the control circuit in consideration of a difference obtained by comparing the measured air amount stored in the storage means. 2. The fan motor control method according to claim 1, wherein instead of storing the measured air amount in the nonvolatile storage means, the difference is calculated in advance and the difference is stored. A method of controlling a fan motor. 3. The fan motor control method according to claim 2, wherein instead of storing the difference, a correction coefficient obtained based on the difference is stored, and the control circuit is controlled by the correction coefficient. Correcting the value of the control data output by the fan motor control method. 4. The method of controlling a fan motor according to claim 1, wherein the measured air amount is transmitted to the control circuit.
A method of controlling a fan motor, comprising: operating an operating member attached to a remote controller connected to a combustion device in a predetermined manner. 5. The fan motor control method according to claim 4, wherein the operating member is a device used by a user to instruct the operation of the combustion device under actual operation of the device. And fan motor control method.