JP3787776B2 - Motor control circuit abnormality determination device and fan fan motor provided with the abnormality determination device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor control circuit abnormality determination device and a blower fan motor including the abnormality determination device.
[0002]
[Prior art]
In a conventional motor control circuit abnormality determination device, for example, in the case of a blower fan motor, the motor is disconnected and the blower fan cannot rotate, and if left as it is, due to heat from a heater for heating and cooling, In order to prevent problems due to overheating, motor disconnection was monitored by a rotational speed sensor using a Hall IC or the like.
[0003]
FIG. 6 is a block diagram of a conventional abnormality determination device for a motor control circuit of a blower fan. In the figure, reference numeral 1 denotes a microcomputer (hereinafter referred to as a microcomputer), which has a memory 2, a CPU 3, an input circuit 4, and an output circuit 5, and controls a motor by a program stored in the memory 2.
[0004]
Reference numeral 6 denotes a blower fan, and 7 denotes a motor for rotating the blower fan, which incorporates a Hall IC 7a that outputs a pulse signal proportional to the rotational speed of the motor. Reference numeral 8 denotes a motor control element for turning on / off the energization of the motor 7, and 9 denotes a motor control element driving unit for operating the motor control element 8, which is controlled by the output circuit 5 in the microcomputer 1.
[0005]
When the motor control element driving unit 9 is turned on by the output circuit 5, the motor control element 8 is turned on and the motor 7 is energized. As a result, the blower fan 6 starts rotating. At this time, the Hall IC 7a outputs a pulse signal proportional to the rotational speed of the blower fan 6, and the microcomputer 1 reads the input of the pulse signal to the input circuit 4 to confirm that the blower fan 6 is rotating. be able to.
[0006]
On the other hand, if the motor 7 is disconnected due to some factor such as an overcurrent and the motor 7 is turned off, the blower fan 6 becomes non-rotatable and the Hall IC 7a cannot output a pulse signal at the same time. At this time, the microcomputer 1 can detect that the rotation of the blower fan 6 is stopped because the input of the pulse signal to the input circuit 4 is stopped. For example, the blower fan 6 has a heater (not shown). For the purpose of cooling the heating device such as the heater, the heater can be stopped before the failure due to overheating.
For example, when the display part (not shown) is mounted, a user can be notified that the ventilation fan 6 has stopped.
[0007]
[Problems to be solved by the invention]
However, in such a conventional motor control circuit abnormality determination device, the motor 7 has a built-in Hall IC 7a for monitoring the rotation of the motor 7, and thus becomes larger than a motor without the Hall IC 7a, and has an extra installation space. There was a problem that it was necessary.
In addition, since a special motor with a built-in Hall IC 7a is required, there is a problem that the cost is increased.
[0008]
The present invention has been made to solve the above-mentioned problems, and it is possible to determine the abnormality of the motor control circuit even if it is not a special motor. The motor control circuit can be installed in a small space by saving the motor in size and at a low cost. It is an object of the present invention to provide an abnormality determination device and a blower fan motor including the abnormality determination device.
[0009]
[Means for Solving the Problems]
An abnormality determination device for a motor control circuit according to the present invention includes a motor, a motor control element that controls energization of the motor, a motor control element driving unit that turns on and off the motor control element, and the control element driving unit When the motor control element is turned off, a monitor signal is output based on whether or not the motor is abnormal. When the motor control element is turned on, the monitor signal is output based on whether or not the motor control element is abnormal. A monitor signal output unit for output, an on / off state of the motor control element, and the presence or absence of abnormality of the motor and the motor control element based on the monitor signal from the monitor signal output unit, and the motor control element Control means for controlling the drive unit.
[0010]
The control means determines that the motor is abnormal when the motor control element is turned off and receives the monitor signal, and determines that the motor is normal when the monitor signal is not received.
[0011]
Further, the control means turns off the motor control element by the motor control element driving unit for a predetermined period every predetermined time, and the rotation of the rotating object rotated by the motor seems to continue rotating. Thus, it is determined whether or not the motor is abnormal.
[0012]
The control means determines that the motor control element is abnormal when the motor control element is turned on and does not receive the monitor signal, and determines that the motor control element is normal when the monitor signal is received. It is.
[0013]
A blower fan motor according to the present invention includes the motor control circuit abnormality determination device according to any one of claims 1 to 4.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 is a configuration diagram of an abnormality determination device for a motor control circuit according to the first embodiment of the present invention, FIG. 2 is a circuit diagram showing electrical connection of the abnormality determination device for a motor control circuit, and FIG. 3 is an abnormality of the motor control circuit. It is a flowchart which shows the operation | movement procedure of a determination apparatus.
It is.
1 and 2 show, for example, an abnormality determination device for a motor control circuit of a blower fan. In FIG. 1, reference numeral 1 denotes a microcomputer (hereinafter referred to as a microcomputer) which is a control means, and includes a memory 2, a CPU 3, an input circuit 4 The output circuit 5 and the monitor signal receiving unit 11 are used, and the motor is controlled by the program stored in the memory 2.
[0015]
6 is a blower fan, and 7 is a motor for rotating the blower fan 6. Reference numeral 8 denotes a motor control element for turning on / off the energization of the motor 7, and 9 denotes a motor control element driving unit for operating the motor control element 8, which is controlled by the output circuit 5 in the microcomputer 1. A monitor signal output unit 10 outputs a monitor signal toward the monitor signal receiving unit 11.
[0016]
In FIG. 2, 12 is a commercial power source, 13 is a heater, and 14 is a relay that opens and closes energization of the heater, and is constituted by a relay contact 14a and a relay coil 14b. A motor control element 8 includes a photocoupler triac 8a and a photocoupler light emitting element 8b.
Reference numeral 15 denotes a diode for rectifying the voltage of the commercial power supply 12, reference numeral 16 denotes a capacitor for smoothing the rectified voltage, and reference numeral 17 denotes a secondary side voltage V1 (−5 [V]) by changing the smoothed voltage. This is an AC / DC converter. Reference numeral 18 denotes a capacitor for stabilizing the V1 voltage output from the AC / DC converter 17.
[0017]
The monitor signal output unit 10 is connected between the motor 7 and the photocoupler triac 8a. The monitor signal output unit 10 receives a resistor 19 and a resistor 20 that divide the potential difference between the connection point and the voltage V1, and receives the divided voltage as a monitor signal. It comprises a transistor 21 for turning on / off the output of A and a resistor 22 for generating a voltage for the monitor signal A.
[0018]
The input circuit 4 of the microcomputer 1 has a function as the monitor signal receiving unit 11 and receives the monitor signal A output from the monitor signal output unit 10 . The output circuit 5 of the microcomputer 1 includes a photocoupler light emitting element 8b connected to the motor control element driving unit 9 including the transistor 9a, a relay coil 14b connected to the heater driving unit 23 including the transistor 23a, and a motor disconnection. A display unit 24 for displaying on is connected.
[0019]
Next, the operation will be described with reference to FIG.
First, when the operation of the abnormality determination device of the motor control circuit is started from step S1, the process proceeds to step S2. In step S2, the output from the output circuit 5 in the microcomputer 1 to the transistor 9a of the motor control element driving unit 9 is turned off, thereby turning off the photocoupler light emitting element 8b of the motor control element 8. As a result, the photocoupler triac 8a is turned off, and energization of the motor 7 is stopped, whereby the motor 7 is stopped and the rotation of the blower fan 6 is stopped.
[0020]
At this time, if the motor 7 is normally connected without disconnection, the voltage supplied from the commercial power supply 12 is applied to the resistor 19 and the resistor 20 via the motor 7, and the divided voltage is input to the transistor 21. Then, the transistor 21 is turned on. That is, the monitor signal A becomes -5 [V], and is input to the monitor signal receiving unit 11 provided in the input circuit 4 of the microcomputer 1 as an off signal. That is, monitor signal output is not performed.
[0021]
On the other hand, when the motor 7 is disconnected for some reason, no voltage is supplied to the resistor 19 and the resistor 20, and at the same time, the transistor 21 is turned off. That is, the monitor signal A becomes 0 [V], the monitor signal is output as an ON signal, and is input to the monitor signal receiving unit 11 provided in the input circuit 4 of the microcomputer 1.
[0022]
In step S3, the monitor signal A input to the monitor signal receiving unit 11 in step S2 is confirmed by the CPU 3, and if the monitor signal A is -5 [V], the monitor signal output is not received and the motor 7 is in a normal state. It determines with there existing and transfers to step S4. If the monitor signal A is 0 [V], it is determined that the motor 7 is in a disconnected state, assuming that the monitor signal output has been received, and the process proceeds to step S5.
[0023]
In step S4, the CPU 3 operates the output circuit 5 to turn on the output to the transistor 9a, thereby turning on the photocoupler light emitting element 8b. As a result, the photocoupler triac 8a is turned on, energization of the motor 7 is started, the motor 7 rotates, and the blower fan 6 starts rotating. At the same time, the output circuit 5 is operated to turn on the relay contact 14b through the transistor 23a, turn on the heater 13, and start heating.
[0024]
On the other hand, when it is determined in step S3 that the motor 7 is in a disconnected state and the process proceeds to step S5, the CPU 3 operates the output circuit 5, turns off the relay contact 14b via the transistor 23a, and stops the heater 13. . At the same time, a display for informing the user that the motor 7 is disconnected is output to the display unit 24.
[0025]
As described above, even if a special motor with a built-in Hall IC is not required, the disconnection of the motor can be detected with certainty, and the motor 7 can be made smaller compared to a special motor with a built-in Hall IC, saving A motor can be installed in space.
Furthermore, since the means for detecting disconnection is composed of a transistor and a resistor, the cost can be reduced as compared with the case where a special motor with a built-in Hall IC is used.
Even when the motor 7 is disconnected and the blower fan 6 is unable to rotate, problems due to overheating of the heater can be prevented.
[0026]
Embodiment 2. FIG.
In the first embodiment, the motor control element 8 is turned off to detect disconnection of the motor while the power supply to the motor 7 is turned off. However, in the present embodiment, the motor control element 8 is reversed. Is turned on, and while the energization of the motor 7 is turned on, the failure of the motor control element 8 is detected.
[0027]
The configuration diagram of the abnormality determination device for the motor control circuit according to the second embodiment and the circuit diagram showing the electrical connection according to the present invention exclude the program contents stored in the memory 2 in FIGS. 1 and 2 in the first embodiment. The operation is the same as in FIG. 1 and FIG. FIG. 4 is a flowchart illustrating an operation procedure of the abnormality determination device for the motor control circuit according to the second embodiment.
[0028]
Next, the operation will be described with reference to FIG.
In the figure, steps S1 to S3 and S5 which are the same as those in FIG.
[0029]
In step S4, the energization starts to the motor 7, when the blower fan 6 you start rotating, the photocoupler triac 8a and the photocoupler light-emitting element 8b of the motor control device 8 is not a fault both operating normally Then, the voltage supplied from the commercial power supply 12 is applied to the resistor 19 and the resistor 20 via the photocoupler triac 8a, and the divided voltage is input to the transistor 21. However, the voltage applied to the resistor 19 and the resistor 20 becomes the same potential as 0 [V] through the photocoupler triac 8a, and the voltage input to the transistor 21 by the voltage division by the resistor 19 and the resistor 20 is the transistor The voltage is smaller than the 21 operable voltage. As a result, the transistor 21 is turned off, the monitor signal A becomes 0 [V], the monitor signal is output as an on signal, and is input to the monitor signal receiving unit 11 provided in the input circuit 4 of the microcomputer 1.
[0030]
On the other hand, if the motor control element 8 fails due to some cause such as a surge current and the motor 7 cannot be energized, the voltage supplied from the commercial power supply 12 is applied to the resistor 19 and the resistor 20 via the motor 7. The divided voltage is input to the transistor 21, and the transistor 21 is turned on. That is, the monitor signal A becomes −5 [V], and is input to the monitor signal receiving unit 11 provided in the input circuit 4 of the microcomputer 1 as an off signal. That is, monitor signal output is not performed.
[0031]
In step S6, the CPU 3 confirms the monitor signal A input to the monitor signal receiving unit 11 in step S4. If the monitor signal A is 0 [V], it is assumed that the monitor signal output is received and the motor control element 8 is normal. It determines with it being in a state, and transfers to step S7. If the monitor signal A is −5 [V], it is determined that the motor control element 8 has failed and the motor 7 cannot be energized because the monitor signal output is not received, and the process proceeds to step S8.
[0032]
In step S7, the operation of the output circuit 5 by the CPU 3 is continued and the output to the transistor 9a and the transistor 23a is turned on to continuously energize the motor 7 and the heater.
[0033]
On the other hand, when it is determined in step S6 that the motor control element 8 has failed and the motor 7 cannot be energized and the process proceeds to step S8, the CPU 3 operates the output circuit 5 and relays the relay contact 14b via the transistor 23a. Is turned off and the heater 13 is stopped. At the same time, a display for informing the user that the motor control element 8 has failed and the motor 7 cannot be energized is output to the display unit 24.
[0034]
As described above, since the failure of the motor control element 8 can be detected while the motor control element 9 is turned on and the energization of the motor 1 is turned on, the motor control circuit further improves the reliability. Can be determined.
Further, even when the motor control element 8 breaks down and the motor 7 cannot be energized, and the blower fan 6 becomes unable to rotate, problems due to overheating of the heater or the like can be prevented.
[0035]
Embodiment 3 FIG.
In the first embodiment, the disconnection of the motor 7 is detected while the motor control element 8 is turned off and the motor 1 and the blower fan 6 are stopped. In this embodiment, the blower fan 6 is rotated while the blower fan 6 is rotating. At intervals that do not affect the rotation of the fan 6, the motor control element 8 is turned off, the state of the monitor signal A while the motor control element 8 is turned off is confirmed, and after confirmation, the motor control element 8 is turned on again. Thus, the disconnection of the motor 7 is detected while the blower fan 6 is rotated.
[0036]
The configuration diagram for implementing the abnormality determination device for the motor control circuit according to the third embodiment of the present invention and the circuit diagram showing the electrical connection are the same as those shown in FIGS. 1 and 2 of the first embodiment. This is a point in which the CPU 3 of the microcomputer 1 is provided with a counter (not shown) for measuring the energization time of the motor 7 and the program contents stored in the memory 2.
The memory 2 has a set time B, which is a time interval in which the rotational speed of the blower fan 6 does not change (decrease) so much even if the motor 7 is temporarily stopped while the blower fan 6 is rotating. Stored in advance.
Other configurations are the same as those shown in FIGS. FIG. 5 is a flowchart showing an operation procedure of the abnormality determination device for the motor control circuit according to the third embodiment.
[0037]
Next, the operation will be described with reference to FIG.
In the figure, steps S1 to S5 that are the same as those in FIG. 3 are the same as those in the first embodiment, and thus description thereof is omitted.
[0038]
In step S9, the variable counter 1 of the CPU counter, which is a variable for measuring the energization time to the motor 7, is cleared and counting is started.
[0039]
In step S10, the variable counter 1 is incremented every second, and it is confirmed whether the energization time for the motor 7 has exceeded the set time B (assumed to be 10 seconds). At this time, if counter 1 <10, it is assumed that the motor 7 energization time has not passed the set time B (10 seconds), the operation is continued as it is, and the counter 1 is counted up. On the contrary, if the counter 1 ≧ 10, the motor 7 energization time has passed the set time B (10 seconds), the process proceeds to step S2, and the disconnection of the motor is detected again.
[0040]
The value of the set time B is set to a value that does not affect the rotational speed of the blower fan 6, that is, the amount of blown air does not change (decrease) so much. The time for turning off the motor control element 8 is, for example, about 30 ms .
Further, when the motor control element 8 is turned off, the motor 1 rotates for a while due to inertia unless the brake is applied, so that it is easy to prevent the rotational speed of the blower fan 6 from being affected.
[0041]
As described above, at every interval that does not affect the rotation of the blower fan 6, the motor control element 8 is turned off, the motor 1 is de-energized, the motor disconnection is detected, and the motor 7 is rotated while the blower fan 6 is rotated. Disconnection detection can be performed.
In the above first to third embodiments, the rotating object of the motor 1 is shown as the blower fan 6, but the rotated object may be other than the blowing fan 6.
[0042]
【The invention's effect】
As described above, according to the present invention, the motor, the motor control element that controls energization to the motor, the motor control element driving unit that turns on and off the motor control element, and the control element driving unit When the motor control element is turned off, a monitor signal is output based on whether or not the motor is abnormal. When the motor control element is turned on, a monitor signal is output based on whether or not the motor control element is abnormal. A monitor signal output unit, an on / off state of the motor control element, and the presence / absence of abnormality of the motor and the motor control element based on the monitor signal from the monitor signal output unit and the motor control element driving unit Control means for controlling the motor, so that even if it is not a special motor, it is possible to judge the abnormality of the motor control circuit, to reduce the size of the motor, and to save space. It can be installed in the scan, and may be a low cost.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an abnormality determination device for a motor control circuit according to a first embodiment of the present invention.
FIG. 2 is a circuit diagram showing electrical connection of an abnormality determination device for a motor control circuit according to the first embodiment of the present invention.
FIG. 3 is a flowchart showing an operation procedure of the abnormality determination device for the motor control circuit according to the first embodiment of the present invention.
FIG. 4 is a flowchart showing an operation procedure of an abnormality determination device for a motor control circuit according to a second embodiment of the present invention.
FIG. 5 is a flowchart showing an operation procedure of an abnormality determination device for a motor control circuit according to a third embodiment of the present invention.
FIG. 6 is a configuration diagram of an abnormality determination device for a conventional motor control circuit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Microcomputer, 2 Memory, 3 CPU, 4 Input circuit, 5 Output circuit, 6 Blower, 7 Motor, 8 Motor control element, 9 Motor control element drive part, 10 Monitor signal output part, 11 Monitor signal receiving part

Claims (5)

A motor,
A motor control element for controlling energization to the motor;
A motor control element driving section for turning on / off the motor control element;
When the motor control element is turned off by the control element driving unit, a monitor signal is output based on whether or not the motor is abnormal, and when the motor control element is turned on, whether or not the motor control element is abnormal is output. A monitor signal output unit for outputting a monitor signal based on
Control means for determining whether or not the motor and the motor control element are abnormal based on the on / off state of the motor control element and the monitor signal from the monitor signal output unit and controlling the motor control element driving unit When,
An abnormality determination device for a motor control circuit, comprising:   The control means determines that the motor is abnormal when the motor control element is turned off and receives a monitor signal, and determines that the motor is normal when the monitor signal is not received. An abnormality determination device for the motor control circuit described.   The control means turns off the motor control element by the motor control element driving unit for a predetermined period every predetermined time so that the rotation of the rotating object rotated by the motor continues to rotate. 3. The motor control circuit abnormality determination device according to claim 2, wherein presence / absence of abnormality of the motor is determined.   The control means determines that the motor control element is abnormal when the motor control element is turned on and does not receive the monitor signal, and determines that the motor control element is normal when the monitor signal is received. The abnormality determination device for a motor control circuit according to claim 1.   A motor for a blower fan comprising the abnormality determination device for a motor control circuit according to claim 1.

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