JP3867919B2 - Fan motor control device - Google Patents

Description

  The present invention relates to a fan motor control circuit provided with a combustion motor and other fan motor control circuits incorporated in the equipment, or an abnormality detection function of the fan motor itself.

  The detection circuit that detects the rotation of the fan motor that is installed in the device is driven in the stop state of the fan motor depending on the stop position of the fan motor, even in a normal state where the elements inside the detection circuit are not damaged. The signal may be output incorrectly. The drive signal due to such erroneous output may be a signal similar to a normal drive signal when driven in normal operation. On the other hand, a detection circuit for detecting rotation abnormality of the fan motor control device has also been provided in the past. However, this is a control device for grasping the drive state of the fan motor in the normal operation state where the control device is driven. The fan motor drive state was not monitored in the operation stop state where the motor was not driven.

  Also, when the drive signal is erroneously output despite the operation stop state in which the fan motor is not driven due to damage to the drive element, etc., it is predicted by the case of driving in the normal operation stored in the microcomputer or the like. If the drive signal and the erroneously output drive signal at the time of stop are similar, the detection circuit that detects the rotation abnormality of the fan motor control device may erroneously determine that it is in the drive state. .

Therefore, the present inventor has already provided one means of this improvement method in Patent Document 1 below. In other words, in a normal operation state, a voltage having a value lower than the lower limit value of the voltage range applied to the fan motor is applied to the fan motor to rotate, and a predetermined reference rotation obtained in advance for the number of rotations of the fan motor at this time Compared with the numerical value, when the difference becomes an unacceptable difference, it is determined that the fan motor rotation speed abnormality has occurred.
Japanese Patent Laid-Open No. 2003-153570

  However, problems remained with these measures. In other words, although it is a low voltage that is not used during normal operation, the voltage is applied to generate torque in the fan motor and actually rotate. For example, when the fan motor has a short-circuit failure, the reverse is confirmed by the inspection. There was a possibility of causing a secondary disaster. Even if there was a problem in the rotation speed detection circuit and the comparison circuit with the reference rotation value at the time of this inspection, it was still impossible to make a normal judgment.

In order to solve the above-mentioned problems, the present invention is reliable and reliable even in the operation stop state, in order to detect abnormality of the fan motor or its control circuit,
A fan motor control device whose rotational speed has a predetermined characteristic with respect to an applied drive voltage;
When checking the operation when the operation of the fan motor is stopped, a test voltage that is lower than the lower limit value of the drive voltage range applied to the fan motor during normal operation and does not generate torque is applied to the fan. An abnormal signal is output when rotation is recognized in the fan motor when applied to the motor;
A fan motor control device characterized by the above is proposed.

  In addition to satisfying the above basic configuration, in a specific aspect of the present invention, when rotation of the fan motor is detected when no drive voltage is applied to the fan motor, the fan motor is torqued for a predetermined short time. If a second test voltage is generated and rotation is detected after a certain period of time after a predetermined time has elapsed, the fan motor control circuit is determined to be abnormal. A fan motor control device as described above is also proposed.

  According to the present invention, if a normal test voltage is applied so that the fan motor does not rotate, the number of rotations at that time is not detected, and the difference from the reference rotation number is not compared. Since it only needs to be detected, a quick decision can be made with a simple circuit. In addition, since the applied voltage can be considerably low, secondary disasters that tend to increase as a large voltage is applied, such as a short circuit failure of a fan motor, can be well suppressed, and the safety of the built-in equipment is sufficiently secured. It can be secured.

  In addition to this, the second test voltage can detect fan motor control circuit abnormalities based on the detection of fan motor rotation when the vehicle is stopped, which also contributes greatly to the safety of the equipment. .

  Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 and 2. First, as shown in FIG. 1, a device 20 incorporating the present invention has a remote controller (hereinafter abbreviated as a remote controller) 11. Then, a remote control signal is sent to the microcomputer 14 which is the main control circuit of the fan motor control system incorporated in the device 20. The microcomputer 14 directly instructs and controls the drive control circuit 15 for applying and supplying the drive applied voltage to the fan motor 13, and the rotational speed of the fan motor 13 at that time is detected by the rotational speed detection circuit 12. Returned to computer 14.

  The microcomputer 14 decodes the remote control signal sent from the remote controller 11 and sends a fan motor control signal to the drive control circuit 15, and the drive control circuit 15 that receives this decodes the drive voltage range during normal operation, that is, in FIG. An appropriate drive voltage is applied to the fan motor 13 from time to time in the range from the minimum voltage Vmin to the maximum voltage Vmax. The voltage range Ra during this period is the drive voltage range during normal operation of the fan motor 13.

  Here, as indicated by a characteristic curve Sa in FIG. 2, a fan motor 13 having a predetermined rotational speed (rpm) with respect to the applied voltage (V) is used. The storage element 16 connected to the microcomputer 14 stores rotational speed data predicted according to the predetermined characteristics of the fan motor with respect to the applied voltage when the fan motor having the predetermined characteristics is in a normal state. The microcomputer 14 reads from the storage element 16 data on the number of revolutions predicted for the value of the drive voltage actually applied to the fan motor 13. On the other hand, the rotational speed detection circuit 12 detects the rotational speed of the fan motor 13 and sends the detected rotational speed data of the fan motor 13 to the microcomputer 14. Therefore, under actual operating conditions, an abnormality in the fan motor 13 or the drive control circuit 15 can be detected based on the data difference between them. If an abnormality occurs, the operation of the fan motor 13 is stopped, and if necessary, the notification device 17 It can be operated to notify the user of the occurrence of an abnormality.

  Although the above determination can be made during normal operation, the present invention can reliably and reliably detect an abnormality even when the operation is stopped. That is, when the operation of the fan motor 13 is confirmed, a remote control signal for operation confirmation is sent from the remote control device 11 to the microcomputer 14. In response to this, the microcomputer 14 sends a control signal for applying a test voltage to the fan motor 13 to the drive control circuit 15. The value of the test voltage applied to the fan motor 13 by the drive control circuit 15 at this time is a voltage at which the fan motor 13 does not generate torque, that is, a voltage at which rotation does not occur.

  Referring to FIG. 2, when the applied voltage falls below a certain value Vlmt, the fan motor 13 does not rotate. Therefore, the test voltage that the microcomputer 14 instructs the drive control circuit 15 to generate is a voltage equal to or lower than the critical voltage Vlmt, that is, a voltage having a value in the torque non-generation voltage region Ro. In other words, this means that it can be a fairly small voltage.

  At this time, if the fan motor 13 rotates, for some reason, a large drive voltage that is not the test voltage commanded by the microcomputer 14 is applied to the fan motor 13, and the drive control circuit This means that an abnormality has occurred in the fan motor control circuit system including 15. Therefore, it is possible to detect such a circuit system abnormality only by detecting whether the rotation is not the number of rotations of the fan motor 13 by the rotation number detection circuit 12 or a rotation detection circuit provided exclusively for the rotation. it can.

  Further, since the test voltage may be a small value, if a short circuit abnormality occurs in the fan motor 13 at that time, the occurrence of a secondary disaster can be suppressed or the damage can be reduced.

  Of course, if an abnormality is detected in the above test, the subsequent drive control is stopped, and more preferably the alarm device 17 including a visual display such as an LED display and an audible display such as a buzzer is moved to the user. Notify that an abnormality has occurred.

  As mentioned earlier, avoiding false detection due to erroneous output when the fan motor 13 is stopped, that is, avoiding the case where the drive signal is erroneously output depending on the stop position of the fan motor 13. If the rotation of the fan motor 13 is detected when no driving voltage is applied to the fan motor 13, a second test voltage (in FIG. 2) that the fan motor 13 generates torque for a predetermined short period of time. Even if the application of this second test voltage is stopped after a predetermined period of time and a rotation is detected after a certain period of time, the microcomputer 14 is used to control the fan motor. It may be determined that the circuit is abnormal.

It is a block diagram which shows the structure of the fan motor control apparatus which concerns on this invention. It is a characteristic view of a fan motor showing the number of rotations with respect to an applied voltage.

Explanation of symbols

11 Remote controller
12 Speed detection circuit
13 Fan motor
14 Microcomputer
15 Drive control circuit
16 Memory element
17 Notification device
20 Equipment

Claims (2)

A fan motor control device whose rotational speed has a predetermined characteristic with respect to an applied drive voltage;
When checking the operation when the operation of the fan motor is stopped, a test voltage that is lower than the lower limit value of the drive voltage range applied to the fan motor during normal operation and does not generate torque is applied. An abnormal signal is output when rotation is recognized in the fan motor when applied to the fan motor;
A fan motor control device. A fan motor control device according to claim 1;
If rotation of the fan motor is detected when no drive voltage is applied to the fan motor, a second test voltage for generating torque by the fan motor is applied for a predetermined short period of time;
Fan motor control, characterized in that, even if the application of the second test voltage is stopped after a predetermined time, and if rotation is detected after a certain period of time, it is determined that the fan motor control circuit is abnormal. apparatus.

Images