JP2006003015A - Control method of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller of an indoor fan motor for normally starting the indoor fan motor so that it does not bring discomfort to a user. <P>SOLUTION: A control part 6 is provided with a rotational frequency setting table 7 for setting the rotational frequency of a blower fan 5 in advance on the basis of an air volume mode, a rotational frequency-applied voltage corresponding table 8 for setting the applied voltage in advance in correspondence with the indicated rotational frequency, a rotational frequency comparing part 9 for comparing the rotational frequency of the blower fan 5 detected by the rotational frequency detecting sensor 13 with a rotational frequency set in advance by the rotational frequency setting table 7 on the basis of subtraction processing, a determining part 10 for determining whether the starting voltage applied to the fan motor 4 is to be changed or not on the basis of a value as a result of the comparison by the rotational frequency comparing part 9, and an applied voltage level table 12 and an output voltage setting part 11 for stepwise changing the starting voltage applied to the fan motor 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for controlling an AC motor used as an indoor fan motor of an air conditioner. Specifically, the indoor fan motor rotates at an excessive number of revolutions to prevent so-called overshoot and perform proper operation. Related to the configuration.

  For example, as shown in FIG. 6A, a conventional air conditioner includes a control unit that drives an indoor fan, a power supply voltage 30, an open / close switch 31 that turns on / off an applied voltage from the power supply voltage 30, and an applied voltage. The power supply voltage detection circuit 32 for detecting the indoor fan motor 33, the phase control circuit 34 for driving the indoor fan motor 33, the indoor unit control unit 35, and the room temperature sensor 38 connected to the indoor unit control unit 35. The indoor unit controller 35 includes a timer 36 for measuring the operation stop time of the indoor fan motor 33, a memory 37 in which a predetermined operation stop time is set in advance, and the measured operation stop time and the predetermined operation stop. When a comparison circuit for comparing with time is provided and the operation has been stopped for a long time, the phase control circuit 34 causes the indoor fan motor 33 to be supplied with a normal drive voltage by the comparison circuit when the operation is started. The indoor fan motor 33 is smoothly started by applying a high start voltage for a short time (see, for example, Patent Document 1).

  However, when starting as described above based on the operation stop time, in some cases, the starting voltage is too high, the rotation speed of the indoor fan motor is abnormally increased, so-called overshoot phenomenon, noise, etc. There was a problem of increasing. On the other hand, when the normal starting voltage is low, there is a case where the indoor fan motor does not start up smoothly.

Japanese Laid-Open Patent Publication No. 5-157340

  In view of the above-described problems, the present invention provides an AC fan motor installed in an indoor unit in which the starting voltage is increased from the next operation when the so-called overshoot phenomenon in which the starting voltage is too high and the rotation speed is excessive occurs. An object of the present invention is to provide a control method for an air conditioner that can be lowered stepwise, and if it is too low, raise the starting voltage and perform an operation that accurately corresponds to the indicated rotational speed.

  The present invention stores the set command speed and the applied voltage composed of the start voltage and the drive voltage set corresponding to the command speed, and after applying the start voltage to the motor at the start, In the motor control method switched to the drive voltage, after a predetermined time of operation start, the rotational speed of the motor is detected and compared with the indicated rotational speed, and if the difference is outside the predetermined range, the start voltage Is stored, and the motor is started by applying the changed starting voltage from the next operation. Further, the set command rotation speed and the applied voltage composed of the start voltage and the drive voltage set corresponding to the command rotation speed are stored, and after applying the start voltage to the fan motor at the start, In the control method of the air conditioner that is switched to the drive voltage, after a predetermined time of operation start, the rotational speed of the fan motor is detected and compared with the indicated rotational speed, and when the difference is outside the predetermined range, The startup voltage is changed and stored, and the fan motor is started by applying the changed startup voltage from the next operation. Further, a rotation speed generation unit that generates a command rotation speed based on the operation mode and the air volume mode, an applied voltage generation unit that outputs a voltage to be applied corresponding to the command rotation speed, and a rotation speed detection sensor Whether to change the starting voltage applied to the fan motor based on the result of the comparison between the rotation speed comparison section comparing the rotation speed and the rotation speed output from the rotation speed generation section, and the rotation speed comparison section A determination unit that determines whether or not, an application voltage changing unit that changes an applied voltage based on a determination result from the determination unit and a value compared by the rotation speed comparison unit, and a changed starting voltage The control device is composed of an output voltage setting unit that outputs the same. The applied voltage changing means is composed of a preset applied voltage level table.

  According to the present invention, the controller sets a rotation speed setting table in which the rotation speed of the blower fan is set in advance based on the air volume mode, and a rotation speed-applied voltage correspondence table in which a voltage to be applied corresponding to the indicated rotation speed is set in advance. A rotational speed comparison unit that subtracts and compares the rotational speed of the blower fan detected by the rotational speed detection sensor and the rotational speed preset in the rotational speed setting table, and the same rotational speed comparison unit. A determination unit that determines whether or not to change the starting voltage applied to the fan motor based on the compared value; an applied voltage level table that presets the starting voltage applied to the fan motor stepwise; When an overshoot phenomenon occurs in the fan motor by storing the starting voltage based on the applied voltage level table and providing an output voltage setting unit that outputs it By reducing the starting voltage, it is possible to provide a control device for an air conditioner that prevents noise or vibrations from occurring and raises the starting voltage when the starting voltage is low, thereby enabling smooth start-up. .

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

  FIG. 1 is a block diagram showing an indoor fan motor control apparatus according to the present invention, and FIGS. 2 and 3 are various tables explaining the inside of the block diagram. FIG. 4 is a table showing applied voltages and time axes, and FIG. 5 is an operation flowchart. In FIG. 1, 1 is a commercial power source, 2 is a main switch, 3 is a voltage adjustment circuit, 4 is a fan motor, 5 is a blower fan connected to the fan motor 4, and 13 appropriately detects the rotational speed of the blower fan 5. 6 is a control unit. In the control unit 6, the rotation speed of the blower fan 5 is set in advance based on the operation mode such as heating and cooling operation and the air volume mode such as strong wind or weak wind, and the rotation speed shown in FIG. A rotation speed setting table 7 as a generation unit, and a voltage to be applied to the fan motor 4 corresponding to the instruction rotation speed instructed from the rotation speed setting table 7 is set in advance as shown in FIG. A rotation speed-applied voltage correspondence table 8 as a voltage generator is provided. As shown in the same rotation speed-applied voltage correspondence table 8, the applied voltage is set to be approximately 20 to 30% higher than the drive voltage set corresponding to the indicated rotation speed and approximately 1 at the start of operation. The starting voltage applied to the fan motor 4 for a short time of ˜2 seconds is set. An operation unit 15 for setting the operation state of the fan motor 4 is connected to the same rotation speed-applied voltage correspondence table 8.

  Further, the control unit 6 includes a rotation speed comparison unit 9 that compares the rotation speed of the blower fan 5 detected by the rotation speed detection sensor 13 with the rotation speed set in advance in the rotation speed setting table 7. And a determination unit 10 that determines whether or not to change the starting voltage applied to the fan motor 4 based on the value compared by the rotation speed comparison unit 9. For example, as shown in the determination criterion of FIG. 3A, the determination unit 10 determines that the difference between the indicated rotation number specified by the rotation speed setting table 7 and the detection value detected by the rotation speed detection sensor 13 is the same. If it is in the range of 0 to 200 rpm, it is determined that it is not necessary to change the startup voltage, and if the difference is 200 rpm or more, it is determined in advance that it is determined that the startup voltage needs to be changed. The rotation speed comparison unit 9 is connected to a timer 14 that measures a predetermined time after the operation of the fan motor 4 is started and sends a signal to the rotation speed comparison unit 9.

  The controller 6 receives the applied voltage instructed from the rotational speed-applied voltage correspondence table 8 and transmits the applied voltage to the voltage adjustment circuit 3, while the fan is based on the result determined by the determining unit 10. An output voltage setting unit 11 that changes the starting voltage applied to the motor 4 in stages is provided. Further, an applied voltage level table 12 as an applied voltage changing means shown in FIG. 3B is connected to the output voltage setting unit 11, and the applied voltage level table 12 includes, for example, level-2 to level 3 For example, the applied voltage is set in advance step by step at intervals of 5V. In level 0, a normally applied starting voltage, for example, 130V, is set, but in level-1, a lower 125V is set, and in level 1, 135V is set. It should be noted that the level at which the level is determined is arbitrary, and the level may be set at 1V intervals.

  Next, the operation will be described. As shown in the flowchart of FIG. 5, when the operation of the air conditioner is started and the fan motor 4 is activated, it is first determined whether or not the operation is the first operation (STEP 1). In the case of the initial operation, the rotation speed set in the rotation speed setting table 7 based on the operation mode and the air volume mode input from the operation unit 15 is used as the instruction rotation speed, and the rotation speed-applied voltage correspondence The starting voltage and the driving voltage corresponding to the designated rotational speed are selected in the same rotational speed-applied voltage correspondence table 8 and sent to the voltage adjusting circuit 3 (STEP 2). In the same voltage adjusting circuit 3, the instructed starting voltage is applied to the fan motor 4 for a short time (about 1 to 2 seconds) to start it, and after the rotation is started, the voltage is set to a normal driving voltage. After that, the output voltage setting unit 11 performs feedback control so that the indicated rotational speed corresponding to the drive voltage is obtained.

  When the fan motor 4 is activated, the timer 14 connected to the controller 6 is activated and the operation time is measured (STEP 4). When it is confirmed that a predetermined time has elapsed after the start of operation (STEP 5), the rotation speed detection sensor 13 detects the rotation speed of the fan motor 4, and the rotation speed detection value is sent to the rotation speed comparison section 9. It is supposed to be sent out.

  The rotational speed comparison unit 9 compares the transmitted rotational speed detection value with the designated rotational speed set in the rotational speed setting table 7 (STEP 7), and sends the result to the determination unit 10. The determination unit 10 determines the difference between the rotation speed detection value and the command rotation speed based on the determination criteria of FIG. 3. For example, if the difference is in the range of 0 to 200 rpm, the start voltage applied at the start is determined. While it is determined that the change is not necessary, if the difference is 200 rpm or more, it is determined that the start voltage needs to be changed (STEP 8). The determination result is sent to the output voltage setting unit 11, and when the output voltage setting unit 11 determines that the start voltage needs to be changed, the start voltage set in advance in the applied voltage level table 12 is determined. The starting voltage is changed based on the level, and the changed information is stored. For example, if the initial startup voltage is 130V (level 0) and overshoot occurs, the startup voltage is changed to level-1 (125V) so as to reduce the startup voltage (STEP 10). Is stored (STEP 11). When the start voltage is not changed (STEP 9), the same start voltage is applied to the subsequent operation.

  For example, at the time of the first operation, the designated rotational speed instructed from the rotational speed setting table 7 is 900 rpm of the air volume mode weak wind, and the starting voltage corresponding to this is 130 V by the rotational speed-applied voltage correspondence table 8. Assume that the driving voltage is set to 100V. If the rotation speed detected by the rotation speed detection sensor 12 after a predetermined time from the start of operation is 1300 rpm, for example, the determination unit 10 determines that a rotation speed overshoot phenomenon of 400 rpm has occurred, and the output A signal is sent to the voltage setting unit 11. The output voltage setting unit 11 changes the starting voltage from 130V of level 0 to 125V of level-1 based on the set value set in the starting voltage level table 12, and stores this.

  In the second and subsequent operations, the indicated rotation speed of the fan motor 4 is selected from the rotation speed setting table 7 based on the operation mode and the strong wind or the low wind operation that are instructed from the operation unit 15, and the rotation speed. The starting voltage corresponding to the applied voltage correspondence table 8 is selected by the output voltage setting unit 11. When the start voltage change information is stored in the output voltage setting unit 11, the start voltage change value corresponding to the start voltage change information is sent to the voltage adjustment circuit 3 based on the selected start voltage (STEP 12). The voltage adjusting circuit 3 applies the changed start voltage to the fan motor 4 as shown in FIG. 4 and starts it.

  By adjusting the starting voltage applied at the start of the operation after the next operation by the control procedure described above, the time required for the rotational speed of the fan motor 4 to reach the designated rotational speed can be shortened, depending on the driving voltage. In addition to improving the follow-up performance of feedback control during normal operation, it is possible to reduce the cost by eliminating the need for an unnecessarily high starting voltage, and to prevent the occurrence of noise and the like as much as possible.

  Also in the second and subsequent operations, the above-described indicated rotational speed is compared with the rotational speed detection value, and if it is determined that the starting voltage needs to be changed, the information in the output voltage setting unit 12 is further updated. The operation is continued.

It is a block diagram which shows the control apparatus of the fan motor by this invention. (A) is a rotation speed setting table set in the control unit. (B) is a rotation speed-applied voltage correspondence table set in the control unit. (A) is a determination criterion set in the determination unit. (B) is an applied voltage level set in the applied voltage level table. It is a chart which shows an applied voltage and operation time. It is a flowchart which shows operation | movement. (A) is a block diagram which shows an example of the conventional control part. (B) is a chart which shows the applied voltage and operation time in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Main switch 3 Voltage adjustment circuit 4 Fan motor 5 Blower fan 6 Control part 7 Rotation speed setting table 8 Rotation speed-applied voltage correspondence table 9 Rotation speed comparison part 10 Determination part 11 Output voltage setting part 12 Applied voltage level table 13 Rotational speed detection sensor 14 Timer 15 Operation unit

Claims (4)

A set command rotation speed and an applied voltage composed of a start voltage and a drive voltage set corresponding to the command rotation speed are stored, and the start voltage is applied to the motor at the start, and then the drive voltage is set. In the motor control method to be switched,
After a predetermined time from the start of operation, the rotational speed of the motor is detected and compared with the indicated rotational speed.If the difference is outside the predetermined range, the start-up voltage is changed and stored, and the next operation is started. A method for controlling a motor, wherein the motor is started by applying a changed starting voltage. A set command rotation speed and an applied voltage composed of a start voltage and a drive voltage set corresponding to the command rotation speed are stored, and the drive voltage is applied after the start voltage is applied to the fan motor at the start. In the control method of the air conditioner that is switched to
After a predetermined time from the start of operation, the rotational speed of the fan motor is detected and compared with the indicated rotational speed. If the difference is outside the predetermined range, the starting voltage is changed and stored, and the next operation is performed. A control method for an air conditioner, wherein the fan motor is started by applying a changed starting voltage.   A rotation speed generation unit that generates a command rotation speed based on the operation mode and the air volume mode, an application voltage generation unit that outputs a voltage to be applied corresponding to the command rotation speed, and a rotation speed detected by a rotation speed detection sensor And whether or not to change the starting voltage applied to the fan motor based on the result of comparison between the rotation speed comparison section that compares the rotation speed output from the rotation speed generation section and the rotation speed comparison section. A determination unit for determining the applied voltage, an applied voltage changing unit for changing the applied voltage based on a determination result from the determination unit and a value compared by the rotation speed comparison unit, and the changed starting voltage, An air conditioner control device comprising an output voltage setting unit that outputs   4. The method of controlling an air conditioner according to claim 3, wherein the applied voltage changing means comprises a preset applied voltage level table.

Images