JP2010022196A - Motor drive control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To drive/rotate a brushless DC motor even when a position detection sensor has failed in the motor. <P>SOLUTION: A motor drive control device 101 for controlling the drive of the brushless DC motor 51 includes an abnormality detection unit 102 and a drive voltage generation unit 107. The abnormality detection unit 102 detects abnormality in each of position detection signals Hu to Hw. When abnormality in at least one of the position detection signals Hu to Hw is detected, the drive voltage generation unit 107 generates drive voltages SU2 to SW2 and outputs them to the brushless DC motor 51 based on at least one of the remaining position detection signals Hu to Hw after excluding the position detection signals with the abnormality thereof detected among the position detection signals Hu to Hw. Particularly, the drive voltage generation unit 107 determines the energization periods of the drive voltages SU2 to SW2 based on the normality or abnormality of the position detection signals Hu to Hw at least upon starting the motor 51 and then outputs the drive voltages SU2 to SW2 during the energization periods. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor drive control device, and more particularly to a motor drive control device that controls the drive of a brushless DC motor based on a signal from a position detection unit that detects the position of a rotor.

  In recent years, in an air conditioner equipped with devices such as a compressor and a fan, for example, a three-phase brushless DC motor is used as a power source of these devices.

  Generally, a three-phase brushless DC motor has a rotor (hereinafter referred to as a rotor) made of a permanent magnet having a plurality of magnetic poles, and a stator (hereinafter referred to as a stator) having a three-phase drive coil. ing. A drive voltage corresponding to the position of the rotor with respect to the stator is applied to the drive coil of such a brushless DC motor by a motor drive control device for driving and controlling the motor. As a result, a current corresponding to the drive voltage flows through the drive coil, a magnetic field is generated, and the rotor rotates.

  Here, as a method for detecting the position of the rotor with respect to the stator, a method using three rotor position detection sensors arranged so as to correspond to the respective three-phase drive coils is often used. This rotor position detection sensor is for detecting the relative position of the rotor with respect to the stator based on the magnetic field generated by the permanent magnet of the rotor, and specifically includes a Hall element, a Hall IC, and the like. However, when a malfunction such as a failure occurs in such a position detection sensor, the position detection sensor in which the malfunction has occurred cannot normally detect the position of the rotor. In this case, for example, the motor drive control device applies a drive voltage to the motor such that a half cycle of one cycle has a normal waveform but the remaining half cycle has a waveform out of phase. As a result, the current supplied to the motor increases, the noise and vibration of the motor increase, and the rotation of the motor may become unstable.

  Therefore, for example, as shown in Patent Document 1 (Japanese Patent Laid-Open No. 8-331886) and Patent Document 2 (Japanese Patent Laid-Open No. 2000-184774), motor drive control for detecting whether or not a defect has occurred in the position detection sensor. The device is known. When the motor drive control device of Patent Literature 1 or Patent Literature 2 detects that the position detection sensor has a problem, it stops driving the motor.

  By the way, depending on the use of the motor and the like, it may be necessary to continue to rotate the motor even if the position detection sensor has a problem. However, in such a case, when the motor drive control devices of Patent Document 1 and Patent Document 2 are applied, the rotation of the motor stops when a problem occurs in the position detection sensor. It becomes difficult to make it.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a motor drive control device that can rotate a motor even when a problem occurs in a position detection sensor in a brushless DC motor.

  A motor drive control device according to a first aspect of the present invention includes a stator having a drive coil, a rotor having a plurality of magnetic poles, and a plurality of position detection units that output position detection signals indicating the position of the rotor with respect to the stator. A motor drive control device that controls the drive of a brushless DC motor, and includes an abnormality detection unit and a drive voltage generation unit. The abnormality detection unit detects an abnormality of each position detection signal. When an abnormality of at least one position detection signal is detected by the abnormality detection unit, the drive voltage generation unit performs brushless DC based on at least one of the remaining position detection signals excluding the position detection signal detected as abnormal. A drive voltage for driving the motor is generated and output to the brushless DC motor. In particular, the drive voltage generation unit determines an energization period of the drive voltage based on the normal / abnormal state of the position detection signal at least when the motor is started, and outputs the drive voltage during the energization period.

  According to this motor drive control device, since a failure such as a failure has occurred in at least one position detection unit, and there is an abnormality in the position detection signal output from the position detection unit, the brushless DC motor has no abnormality remaining. A drive voltage generated based on at least one of the position detection signals is output. As described above, since the drive voltage is generated without using the abnormal position detection signal, the brushless DC motor can rotate stably without being affected by the abnormal position detection signal. In particular, when at least one of the position detection units is abnormal, the brushless DC motor after activation may be affected by a position detection signal output from the abnormal position detection unit. As a result, an increase in the current applied to the brushless DC motor, noise, vibration, and the like occur. However, this motor drive control device outputs a drive voltage during the energization period determined based on the normal / abnormal state of the position detection signal, and stops outputting the drive voltage during other periods than the energization period. As a result, the brushless DC motor is not affected by the position detection signal that is abnormal even after startup.

  A motor drive control device according to a second aspect is the motor drive control device according to the first aspect, wherein the drive voltage generation unit uses at least one of the remaining position detection signals excluding the position detection signal detected as abnormal. To estimate the rotor position. The drive voltage generation unit generates a drive voltage based on the estimated rotor position.

  According to this motor drive control device, the drive voltage is generated based on the estimated rotor position instead of generating the drive voltage using the abnormal position detection signal. Thereby, the brushless DC motor can rotate more stably.

  A motor drive control device according to a third aspect of the present invention is the motor drive control device according to the first aspect, wherein the drive voltage generation unit is based on at least one of the remaining position detection signals excluding the position detection signal detected as abnormal. Then, a drive voltage pattern to be output to the brushless DC motor is selected from preset drive voltage patterns and output to the brushless DC motor.

  Here, a case where the position detection signal is a signal having a value of “1” or “0” and there is one position detection signal that is not used because it is abnormal is taken as an example. According to this motor drive control device, when the values of two normal position detection signals are both “1”, “pattern 1” is selected as the drive voltage pattern, and the values of the two normal position detection signals Are “0” and “1”, respectively, “Pattern 2” is selected as the drive voltage pattern. If all three position detection signals are normal, there are six drive voltage patterns. However, if there are two normal position detection signals as described above, there are four drive voltage patterns. Therefore, the energization width of the drive voltage output to the brushless DC motor is not uniform 120 degrees, and is 60 degrees, 120 degrees, and 180 degrees depending on the phase, and the drive voltage value varies depending on the phase, but for each phase When attention is paid, since the drive voltage output to the brushless DC motor is balanced between positive and negative, the brushless DC motor can operate stably.

  A motor drive control device according to a fourth aspect of the present invention is the motor drive control device according to any of the first to third aspects of the present invention, further comprising a rotation speed detection unit. The rotation speed detection unit detects the rotation speed of the rotor using at least one of the remaining position detection signals excluding the position detection signal detected as abnormal. The drive voltage generation unit further adjusts the drive voltage according to the rotation speed of the rotor detected by the rotation speed detection unit.

  According to this motor drive control device, the rotational speed is detected using a position detection signal that is not abnormal, and the drive voltage is further adjusted according to the rotational speed, so that the rotational speed control of the brushless DC motor is performed more appropriately. It becomes like this.

  A motor drive control device according to a fifth aspect of the present invention is the motor drive control device according to any of the first to fourth aspects, wherein the position detection unit is any one of a Hall element and a Hall IC.

  As a result, the position of the rotor can be detected without using a complicated circuit or calculation, and the cost can be reduced.

  A motor drive control device according to a sixth aspect of the present invention is the motor drive control device according to any of the first to fifth aspects, further comprising a phase difference detection unit. The phase difference detection unit detects a phase difference between the remaining position detection signals excluding the position detection signal detected as abnormal and an induced voltage generated in each of the drive coils corresponding to the remaining position detection signals. The drive voltage generation unit generates a drive voltage based on the phase difference and the polarity of the remaining position detection signals.

  According to this motor drive control device, for example, even if a problem occurs in a position detection unit whose specification is unknown, the brushless DC motor can rotate without being affected by an abnormal position detection signal.

  A motor drive control device according to a seventh aspect of the present invention is the motor drive control device according to any of the first to fifth aspects, further comprising a sensorless position estimating unit. The sensorless position estimation unit estimates the position of the rotor without using the position detection signal when all the position detection signals are detected as abnormal. When the sensorless position estimation unit estimates the rotor position, the drive voltage generation unit generates a drive voltage using the estimated rotor position without using the position detection signal.

  According to this motor drive control device, the brushless DC motor can rotate without being affected by the position detection signal output from the position detection unit in which a problem has occurred even if a problem occurs in all the position detection units. Can continue.

  A motor drive control device according to an eighth aspect of the present invention is the motor drive control device according to any of the first through seventh aspects, wherein the energization period is a period in which the position detection signal is normal.

  As a result, the drive voltage is output to the brushless DC motor during a period in which the position detection signal is normal.

  A motor drive control device according to a ninth aspect is the motor drive control device according to any one of the first to eighth aspects, further comprising a position determining unit. The position determining unit determines a predetermined position of the rotor that generates a torque in the forward rotation direction when a drive voltage is applied when the brushless DC motor is activated. The drive voltage generator generates a drive voltage that moves the rotor to a predetermined position, and generates a drive voltage for starting the brushless DC motor after the rotor has moved to the predetermined position.

  If it is known in advance that the position detection unit has failed before the brushless DC motor is started, the motor drive control device moves the brushless DC motor to a predetermined position by DC excitation, for example. Start up. As a result, immediately after the brushless DC motor is started, torque in the forward rotation direction is generated in the brushless DC motor, and then the brushless DC motor is started using inertia, so that the brushless DC motor can be started reliably. .

  A motor drive control device according to a tenth aspect of the present invention is the motor drive control device according to any one of the first to ninth aspects, wherein the abnormality detection unit detects an abnormality of the position detection signal before starting the brushless DC motor.

  Thus, the brushless DC motor is not affected by an abnormal position detection signal immediately after starting.

  A motor drive control device according to an eleventh aspect of the present invention is the motor drive control device according to any of the first to tenth aspects of the present invention, further comprising a display unit. The display unit can display that the abnormality detection unit has detected an abnormality in the position detection signal.

  Thereby, the user can know that a defect has occurred in the position detection unit.

  A motor drive control device according to a twelfth aspect of the present invention is the motor drive control device according to any of the first to eleventh aspects of the present invention, further comprising an instruction receiving unit. The instruction receiving unit can receive an execution instruction for an operation for generating a drive voltage based on at least one of the remaining position detection signals excluding the position detection signal detected as abnormal.

  According to this motor drive control device, the instruction receiving unit can receive an operation execution instruction for generating a drive voltage from a user via, for example, a remote controller. When receiving the execution instruction, the motor drive control device can generate a drive voltage based on at least one of the remaining position detection signals excluding the abnormal position detection signal. Therefore, even when at least one of the position detection signals is abnormal, the motor drive control device can drive the brushless DC motor by performing the drive voltage generation operation based on a user instruction.

  According to the motor drive control device according to the first aspect of the present invention, the brushless DC motor does not need to be affected by the abnormal position detection signal even after starting.

  According to the motor drive control device of the second aspect of the present invention, since the drive voltage is generated based on the estimated rotor position instead of using the abnormal position detection signal, the brushless DC motor Rotation can be performed more stably.

  According to the motor drive control device of the third aspect of the present invention, the drive voltage energization width output to the brushless DC motor is not 120 degrees uniform, and is 60 degrees, 120 degrees, and 180 degrees depending on the phase, and the drive voltage value varies depending on the phase. However, if attention is paid to each phase, the drive voltage output to the brushless DC motor is balanced between positive and negative, so that the brushless DC motor can operate stably.

  According to the motor drive control device pertaining to the fourth aspect of the present invention, the rotational speed is detected using a position detection signal that is not abnormal, and the drive voltage is further adjusted according to the rotational speed. Therefore, the rotational speed control of the brushless DC motor is more appropriate. To be done.

  According to the motor drive control device according to the fifth aspect of the present invention, the position of the rotor can be detected without using a complicated circuit or calculation, so that the cost can be reduced.

  According to the motor drive control device of the sixth aspect of the present invention, for example, even if a malfunction occurs in the position detection unit whose specification is unknown, the brushless DC motor can rotate without being affected by an abnormal position detection signal.

  According to the motor drive control device of the seventh aspect of the present invention, even if a failure occurs in all the position detection units, the brushless DC is not affected by the position detection signal output from the position detection unit in which the failure occurs. The motor can continue to rotate.

  According to the motor drive control device of the eighth aspect of the present invention, the drive voltage is output to the brushless DC motor during the period when the position detection signal is normal.

  According to the motor drive control device of the ninth aspect of the present invention, immediately after the brushless DC motor is started, the brushless DC motor generates torque in the forward rotation direction, and then the inertialess brush motor is started.) The motor can be started reliably.

  According to the motor drive control device pertaining to the tenth aspect of the present invention, the brushless DC motor does not need to be affected by an abnormal position detection signal immediately after startup.

  According to the motor drive control device pertaining to the eleventh aspect of the invention, the user can know that a problem has occurred in the position detection unit.

  According to the motor drive control device pertaining to the twelfth aspect of the invention, even when at least one of the position detection signals is abnormal, the brushless DC motor is driven by performing the drive voltage generation operation based on a user instruction. Can do.

The block diagram which showed the structure of the whole system by which the motor drive control apparatus which concerns on 1st Embodiment was employ | adopted, and the internal structure of a motor drive control apparatus. 1 is an external view of an air conditioner that employs a fan motor that is driven and controlled by a motor drive control device according to the present embodiment. The conceptual diagram of the signal determination table 1 which a gate control signal production | generation part uses when all the position detection signals are not abnormal. The conceptual diagram of the signal determination table 2 which a gate control signal production | generation part uses when one position detection signal Hw is abnormal. The flowchart which shows the flow of control operation which the motor drive control apparatus which concerns on 1st Embodiment performs. The timing chart of each signal when a motor rotates to a normal direction by the motor drive control apparatus which concerns on 1st Embodiment. The block diagram which showed the whole structure of the system by which the motor drive control apparatus which concerns on the modification of 1st Embodiment was employ | adopted, and the internal structure of a motor drive control apparatus. The block diagram which showed the whole structure of the system by which the motor drive control apparatus which concerns on 2nd Embodiment was employ | adopted, and the internal structure of this motor drive control apparatus. The figure for demonstrating the specific example in which a position determination part determines a predetermined position. The block diagram which showed the whole structure of the system by which the motor drive control apparatus which concerns on 3rd Embodiment was employ | adopted, and the internal structure of a motor drive control apparatus.

<First Embodiment>
(1) Overall and Motor Configuration FIG. 1 is an overall configuration diagram of a motor drive control system 100 including a brushless DC motor 51 and a motor drive control device 1 for controlling the drive of the brushless DC motor 51. . The brushless DC motor 51 is a fan motor used as a drive source of the propeller fan 61 in the outdoor unit X3 of the air conditioner X1 in FIG. 2 and includes a stator 52, a rotor 53, and three Hall ICs 54u, 54v, 54w ( Equivalent to a position detector). In the following description, the brushless DC motor 51 is simply referred to as a motor 51 for the sake of simplicity.

  The stator 52 includes U-phase, V-phase, and W-phase drive coils Lu, Lv, and Lw that are star-connected. One ends of the U-phase, V-phase, and W-phase drive coils Lu, Lv, and Lw are connected to U-phase, V-phase, and W-phase drive coil terminals TU, TV, and TW, respectively, and the other ends are all terminals TN. It is connected to the. These three-phase drive coils Lu, Lv, and Lw generate induced voltages Vun, Vvn, and Vwn (FIG. 6) corresponding to the rotational speed and the position of the rotor 53 when the rotor 53 rotates.

  The rotor 53 includes a two-pole permanent magnet composed of an N pole and an S pole, and rotates about the rotation axis with respect to the stator 52. The rotation of the rotor 53 is output to the propeller fan 61 via an output shaft (not shown) that is on the same axis as the rotation shaft.

  The three Hall ICs 54u to 54w are provided so as to correspond to the drive coils Lu, Lv, and Lw, respectively. Each Hall IC 54 u to 54 w detects the position of the rotor 53 with respect to the stator 52 based on the magnetic flux generated by the permanent magnet of the rotor 53. Hereinafter, signals indicating the position of the rotor 53 detected by the Hall ICs 54u to 54w are referred to as position detection signals Hu, Hv, and Hw. As shown in FIG. 6, the position detection signals Hu to Hw are rectangular waves indicating “0” or “1”, and are output to the motor drive control device 1.

(2) Configuration of Motor Drive Control Device Next, the configuration of the motor drive control device 1 according to the present embodiment will be described. As shown in FIG. 1, the motor drive control device 1 of the present embodiment includes an abnormality detection unit 2, a rotation speed detection unit 3, a rotation direction detection unit 4, a display unit 5a, a reception unit 5b (corresponding to an instruction reception unit), A sensorless position estimation unit 6 and a drive voltage generation unit 7 are provided.

[Abnormality detection unit]
The abnormality detection unit 2 detects the abnormality of each of the position detection signals Hu to Hw, and determines each Hall IC 54u to 54w in which a malfunction such as a failure has occurred. Here, as a method of detecting an abnormality in each of the position detection signals Hu to Hw, for example, the position detection signals Hu to Hw output based on the positions of the Hall ICs 54u to 54w are output by performing logical operations. Examples include a method for determining whether or not position detection signals Hu to Hw to be output are output, a method for confirming abnormality of the position detection signals Hu to Hw by direct current excitation to the motor 51, and the like. In the present embodiment, it is possible to determine whether or not there is a problem in each of the Hall ICs 54u to 54w not only when the motor 51 rotates but also before the motor 51 performs normal rotation (that is, before the motor 51 is started). Thus, the case where the abnormality detection part 2 uses the former method among the methods mentioned above is taken as an example.

(Rotation speed detector)
The rotational speed detection unit 3 measures the rotational speed of the rotor 53 in the motor 51 using the position detection signals Hu to Hw output from the Hall ICs 54u to 54w. In particular, when there are position detection signals Hu to Hw determined to be abnormal by the abnormality detection unit 2, the rotation speed detection unit 3 according to the present embodiment detects the position detection signals Hu, Hv, In the motor 51, at least one of the remaining position detection signals Hu, Hv, and Hw excluding Hw (that is, position detection signals Hu to Hw output from normal Hall ICs 54u to 54w in which no malfunction occurs) is used. The number of rotations of the rotor 53 is detected. For example, when the position detection signal Hu is abnormal, the rotation speed detection unit 3 detects the rotation speed of the rotor 53 in the motor 51 using the position detection signals Hv and Hw. When there is no position detection signal Hu to Hw detected as abnormal by the abnormality detection unit 2, the rotation number detection unit 3 determines the rotation number of the rotor 53 in the motor 51 based on all the position detection signals Hu to Hw. Is detected.

  In the following, for the sake of simplicity, the rotational speed of the rotor 53 in the motor 51 is simply referred to as “the rotational speed of the motor 51”.

(Rotation direction detector)
The rotation direction detection unit 4 detects the rotation direction of the rotor 53 in the motor 51 using the position detection signals Hu to Hw output from the Hall ICs 54 u to 54 w. In particular, the rotation direction detection unit 4 according to the present embodiment uses the remaining position detection signals Hu to Hw excluding the position detection signals Hu to Hw detected as abnormal by the abnormality detection unit 2, similarly to the rotation number detection unit 3. Thus, the rotation direction of the rotor 53 in the motor 51 is detected. For example, when the position detection signal Hu is abnormal, the rotation direction detection unit 4 detects the rotation direction of the rotor 53 in the motor 51 using the position detection signals Hv and Hw. When there is no position detection signal Hu to Hw detected as abnormal by the abnormality detection unit 3, the rotation direction detection unit 4 rotates the rotation direction of the rotor 53 in the motor 51 based on all the position detection signals Hu to Hw. Is detected.

  Hereinafter, in order to simplify the description, the rotation direction of the rotor 53 in the motor 51 is simply referred to as “the rotation direction of the motor 51” as is the rotation number of the motor 51.

[Display and receiver]
The display unit 5a is for displaying an abnormality of the position detection signals Hu to Hw when the abnormality detection unit 2 detects an abnormality of the position detection signals Hu to Hw. As shown in FIG. 2, the display unit 5a displays the indoor unit X2 of the air conditioner X1. Is provided. The display unit 5a is configured by, for example, an LED or the like, and performs lighting or blinking when an abnormality is detected in any one of the position detection signals Hu to Hw. Moreover, the display part 5a may change the color to light by the case where all the position detection signals Hu-Hw are normal, and the case where one or more position detection signals Hu-Hw are abnormal. Thereby, the user of the indoor unit X2 can know that the Hall ICs 54u to 54w are abnormal.

  Similarly to the display unit 5a, the receiving unit 5b is provided in the indoor unit X2 of the air conditioning apparatus X1 as shown in FIG. The receiving unit 5b can accept various driving instructions from a user made through a remote controller. In particular, the receiving unit 5b according to the present embodiment can receive an operation execution instruction of the drive voltage generation unit 7 and an operation stop instruction. Here, the execution instruction of the operation of the drive voltage generation unit 7 is that at least one of the remaining position detection signals Hu to Hw excluding the position detection signals Hu to Hw detected by the drive voltage generation unit 7 as abnormal. Based on this, it refers to the operation of generating the drive voltages SU1 to SW1. This operation will be described later under “[drive voltage generator]”.

[Sensorless position estimation unit]
The sensorless position estimation unit 6 is for detecting the position of the rotor 53 used when driving the motor 51 by a so-called sensorless system, and includes a position detection comparator and the like. For example, the sensorless position estimation unit 6 determines the position of the rotor 53 relative to the stator 52 based on the induced voltages Vun to Vwn generated in the motor 51 and the neutral point voltage of the motor 51 (specifically, the voltage at the terminal TN of the motor 51). Is detected. That is, the sensorless position estimation unit 6 estimates the position of the rotor 53 without using the position detection signals Hu to Hw.

  The sensorless position estimating unit 6 may function when the abnormality detection unit 2 detects that all the position detection signals Hu to Hw are abnormal while the motor 51 is rotating normally. Further, the sensorless position estimation unit 6 may estimate the position of the rotor 53 regardless of the abnormal state of the position detection signals Hu to Hw. In the present embodiment, a case where the sensorless position estimation unit 6 functions when it is detected that all the position detection signals Hu to Hw are abnormal is taken as an example.

  Further, hereinafter, signals indicating the position of the rotor 53 estimated by the sensorless position estimation unit 6 are referred to as sensorless position estimation signals Hu1 ′, Hv1 ′, and Hw1 ′.

[Drive voltage generator]
The drive voltage generator 7 generates drive voltages SU 1, SV 1, SW 1 for controlling the drive of the motor 51 and outputs them to the motor 51. In particular, the drive voltage generator 7 according to the present embodiment can drive the motor 51 even when at least one abnormality is detected among the position detection signals Hu to Hw by the abnormality detector 2. And an abnormal position estimating unit 8, a gate control signal generating unit 9, and an output circuit 10.

  Note that the operation of the drive voltage generation unit 7 described below may be automatically performed when an abnormality is detected in the position detection signals Hu to Hw, and the reception unit 5b issues an operation instruction from the user. It may be performed when received.

[Abnormal position estimation section]
The abnormal position estimation unit 8 estimates the position of the rotor 53 using at least one of the remaining position detection signals Hu to Hw excluding the position detection signals Hu to Hw detected as abnormal. In particular, the abnormality position estimation unit 8 estimates the position of the rotor 53 when there are one or two position detection signals Hu to Hw detected as abnormal by the abnormality detection unit 2.

  For example, when the position detection signal Hu is abnormal, the abnormal position estimation unit 8 calculates the rotational speed of the rotor 53 based on the time when each of the position detection signals Hv and Hw changes, and the rotational speed of the rotor 53 is calculated. Based on this, the position of the rotor 53 at the location corresponding to the drive coil Lu is estimated. Hereinafter, signals indicating the position of the rotor 53 estimated by the abnormal position estimation unit 8 in this way are referred to as abnormal position estimation signals Hu2 ′, Hv2 ′, and Hw2 ′.

  Here, the abnormal position estimation signals Hu2 ′ to Hw2 ′ are signals representing the position of the rotor 53 (that is, the electrical angle) itself, or “0” or “1” as in the case of the position detection signals Hu to Hw. In this embodiment, the case where the abnormal position estimation signals Hu2 ′ to Hw2 ′ are “0” or “1” signals will be described.

[Gate control signal generator]
The gate control signal generation unit 9 is composed of, for example, a microcomputer including a CPU and a memory, and an output circuit is provided so that drive voltages SU1 to SW1 corresponding to the rotation speed and rotation direction of the rotor 53 are output to the motor 51. 10 generate gate control signals Gu, Gx, Gv, Gy, Gw, Gz for turning on and off insulated gate bipolar transistors Q1 to Q6 (described later) in FIG. In particular, the gate control signal generation unit 9 according to the present embodiment changes the generation method of the gate control signals Gu to Gz according to the detection result by the abnormality detection unit 2.

  Here, how the gate control signal generation unit 9 according to the present embodiment generates the gate control signals Gu to Gz will be described. The memory constituting the gate control signal generation unit 9 includes a control program for the CPU to determine the gate control signals Gu to Gz, and a signal determination table 1 used when the gate control signals Gu to Gz are generated. , 2 are stored. FIG. 3 shows an example of the signal determination table 1 used when there is no abnormality in all the position detection signals Hu to Hw. In this signal determination table 1, the position detection signals Hu to Hw and the gate control signals Gu to Gz are shown. Are associated. FIG. 4 shows an example of the signal determination table 2 used when it is determined that the position detection signal Hw is abnormal. In this signal determination table 2, the position detection signals Hu and Hv, the abnormal position estimation signal Hw2 are shown. 'And the gate control signals Gu to Gz are associated with each other.

  First, when no abnormality is detected in the position detection signals Hu to Hw, the gate control signal generator 9 applies the position detection signals Hu to Hw to the signal determination table 1 in FIG. Gz is generated.

  When one or two of the position detection signals Hu to Hw are abnormal, the gate control signal generator 9 selects a signal determination table based on the abnormal position detection signals Hu to Hw, and the normal position The detection signals Hu to Hw and the abnormal position estimation signals Hu2 ′ to Hw2 ′ are applied to the selected position determination table 2 to generate gate control signals Gu to Gz. For example, when only one position detection signal Hw is abnormal, the signal determination table 2 in FIG. 3 is selected. In this case, the gate control signal generator 9 generates the gate control signals Gu to Gz based on the abnormal position estimation signal Hw2 ′, the normal position detection signals Hu and Hv, and the selected signal determination table 2 instead of the position detection signal Hw. Is generated.

  When all the three position detection signals Hu to Hw are abnormal, the gate control signal generation unit 9 does not use the position detection signals Hu to Hw, and the sensorless position estimation estimated by the sensorless position estimation unit 6 is performed. Gate control signals Gu to Gz are generated using signals Hu1 ′ to Hw1 ′.

  Further, the gate control signal generation unit 9 further adjusts the gate control signals Gu to Gz according to the rotation number of the motor 51 output from the rotation number detection unit 3. Thereby, gate control signals Gu to Gz corresponding to the rotational speed of the motor 51 at that time are generated and output to the insulated gate bipolar transistors Q1 to Q6.

[Output circuit]
The output circuit 10 includes insulated gate bipolar transistors (hereinafter simply referred to as transistors) Q1 to Q6 and free-wheeling diodes D1 to D6. The transistors Q1 and Q2, Q3 and Q4, Q5 and Q6 are connected in series between the power supply line to which the power supply voltage from the power supply unit 11 is supplied and the GND line. The connection points NU, NV, NW between the transistors Q1 and Q2, Q3 and Q4, Q5 and Q6 are connected to the U-phase, V-phase and W-phase drive coil terminals TU, TV and TW of the motor 51, respectively. Yes. The diodes D1 to D6 have such characteristics that they are turned on when a reverse voltage is applied to the transistors Q1 to Q6, and are connected in parallel to the transistors Q1 to Q6.

  According to the output circuit 10 having such a configuration, the drive voltages SU1 to SW1 are generated by turning on and off the transistors Q1 to Q6 based on the gate control signals Gu to Gz applied to the respective gate terminals. It is output to the coils Lu to Lw.

(3) Operation of Motor Drive Control Device (3-1) Overall Control Operation FIG. 5 is a flowchart showing a flow of control operation performed by the motor drive control device 1. In the following, when there are one or two abnormal position detection signals Hu to Hw, the rotational speed, rotation direction and position estimation signals Hu ′ to Hw ′ of the motor 51 are all normal position detection signals Hu to Hw. Take the case of detection and generation from Here, a case where the operation of the drive voltage generation unit 7 described below is automatically performed when an abnormality is detected in the position detection signals Hu to Hw is taken as an example.

  Step S1: When the motor drive control device 1 obtains an instruction to start the motor 51 from the outside of the motor drive control device 1, such as the outdoor unit X3 of the air conditioner X1, the motor drive control device 1 generates drive voltages SU1 to SW1 and generates the motor 51. (S1). As a result, the motor 51 is started.

  Steps S2 to S4: When no abnormality is detected in all the position detection signals Hu to Hw for the three phases (No in S2), the rotation speed detection unit 3 and the rotation direction detection unit 4 determine all the position detection signals Hu to Hw. Is used to detect the rotation speed and rotation direction of the motor 51 (S3). The gate control signal generation unit 9 of the drive voltage generation unit 7 generates the gate control signals Gu to Gz based on all the position detection signals Hu to Hw, the rotational speed of the motor 51, and the like, and each of the transistors Q1 to Q6 of the output circuit 10. To output this. Thus, the transistors Q1 to Q6 are turned on and off by the gate control signals Gu to Gz, and the drive voltages SU1 to SW1 output from the output circuit 10 are applied to the drive coils Lu to Lw in the motor 51. (S4).

  Steps S5 to S8: When the position detection signal of one phase among the position detection signals Hu to Hw for three phases is detected to be abnormal (Yes in S5), the rotation speed detection unit 3 and the rotation direction detection unit 4 detects the number of rotations and the direction of rotation of the motor 51 using a signal excluding the position detection signal for one phase detected as abnormal (that is, the position detection signal for two normal phases) (S6). . The abnormal position estimation unit 8 of the drive voltage generation unit 7 estimates the position of the abnormal rotor 53 for one phase based on the normal two-phase position detection signals Hu to Hw, and outputs an abnormal position estimation signal. Hu2 ′ to Hw2 ′ are output (S7). Then, the gate control signal generation unit 9 generates a gate control signal based on the normal position detection signals Hu to Hw for two phases, the abnormal position estimation signals Hu2 ′ to Hw2 ′ for one phase, and the rotation speed of the motor 51. Gu to Gz are generated. As a result, the transistors Q1 to Q6 of the output circuit 10 are turned on and off based on the gate control signals Gu to Gz, and the drive coils Lu to Lw in the motor 51 receive abnormal position detection signals Hu to Hw. Drive voltages SU1 to SW1 that are not accompanied are output (S8).

  Steps S9 to S12: When the two-phase position detection signals Hu to Hw are detected to be abnormal among the three phase position detection signals Hu to Hw (Yes in S9), the rotational speed detection unit 3 and the rotation The direction detection unit 4 uses a signal (that is, a normal position detection signal for one phase) excluding the position detection signals Hu to Hw for two phases detected to be abnormal, and the rotation speed and the rotation direction of the motor 51. Is detected (S10). The abnormal position estimation unit 8 estimates the position of the abnormal rotor 53 for two phases based on the normal position detection signals Hu to Hw for one phase, and detects an abnormal position estimation signal Hu2 ′ for two phases. ~ Hw2 'is output (S11). Then, the gate control signal generator 9 generates the gate control signal based on the normal position detection signals Hu to Hw for one phase, the abnormal position estimation signals Hu2 ′ to Hw2 ′ for two phases, and the rotation speed of the motor 51. Gu to Gz are generated. As a result, the transistors Q1 to Q6 of the output circuit 10 are turned on and off based on the gate control signals Gu to Gz, and the drive coils Lu to Lw in the motor 51 receive abnormal position detection signals Hu to Hw. Drive voltages SU1 to SW1 that are not accompanied are output (S12).

  Steps S13 to S14: When it is detected that all the position detection signals Hu to Hw for three phases are abnormal (No in S9), the sensorless position estimation unit 6 does not use the position detection signals Hu to Hw. The position of the rotor 53 is estimated, and sensorless position estimation signals Hu1 ′ to Hw1 ′ for three phases are output (S13). Then, the gate control signal generation unit 9 generates gate control signals Gu to Gz based on the sensorless position estimation signals Hu1 ′ to Hw1 ′. As a result, the drive voltages SU1 to SW1 based on the sensorless drive are output to the motor 51 (S14).

  Step S15: The motor drive control device 1 repeats the operations after step S2 until an instruction to stop the rotation of the motor 51 is acquired from the outside of the motor drive control device 1 (No in S15). In addition, when the rotation stop instruction | indication of the motor 51 is acquired (Yes of S15), the motor drive control apparatus 1 stops rotation of the motor 51, and complete | finishes a series of operation | movement.

(3-2) Specific Example of Motor Control Operation by Motor Drive Control Device Next, an example in which the motor drive control device 1 controls the driving of the motor 51 will be briefly described. FIG. 6 is a timing chart showing signals output from the motor drive control device 1 and induced voltages Vun and Vwn generated in the drive coils Lu to Lw of the motor 51 when a malfunction occurs in the Hall IC 54u. It is. The gate control signals Gu to Gz in FIG. 6 are indicated as “H” when “ON” and “L” when “OFF”.

  When a malfunction occurs in the Hall IC 54u, the position detection signal Hu output from the Hall IC 54u is fixed to either “H” or “L”. FIG. 6 shows the case where the position detection signal Hu is fixed at “H”. In this case, the abnormality detection unit 2 detects an abnormality of the position detection signal Hu. The abnormal position estimation unit 8 estimates the position of the rotor 53 based on the normal position detection signals Hv and Hw, and outputs an abnormal position estimation signal Hu2 ′. Next, the gate control signal generation unit 9 generates gate control signals Gu to Gz based on the estimated abnormal position estimation signal Hu2 ′ and the position detection signals Hv and Hw, and outputs the gate control signals Gu to G6 to the transistors Q1 to Q6 of the output circuit 10. Output. Thereby, as shown in FIG. 6, the drive voltages SU1 to SW1 similar to those when the position detection signals Hu to Hw are normal are output to the motor 51.

(4) Effect (A)
In the motor drive control device 1 according to the present embodiment, when troubles such as a failure occur in at least one Hall IC 54u to 54w, the position detection signals Hu to Hw output from the Hall ICs 54u to 54w are abnormal. Based on at least one of the normal position detection signals Hu to Hw, drive voltages SU1 to SW1 are generated and output to the motor 51. As described above, since the drive voltages SU1 to SW1 are generated without using the abnormal position detection signals Hu to Hw, the motor 51 is stable without being affected by the abnormal position detection signals Hu to Hw. And can be rotated.

(B)
Further, according to the motor drive control device 1, instead of generating the drive voltages SU1 to SW1 using the abnormal position detection signals Hu to Hw, the abnormal time estimated using the normal position detection signals Hu to Hw is used. Drive voltages SU1 to SW1 are generated using the position estimation signals Hu2 ′ to Hw2 ′. Thereby, the motor 51 can rotate more stably.

(C)
Further, according to the motor drive control device 1, the rotation speed of the motor 51 is detected using the normal position detection signals Hu to Hw, and the drive voltages SU1 to SW1 are generated based on the rotation speed of the motor 51. Therefore, the rotation speed control of the motor 51 is more appropriately performed.

(D)
In addition, since the Hall IC is used as the position detection unit of the motor 51, the position of the rotor can be detected without using a complicated circuit or calculation, so that the cost can be reduced.

(E)
Further, when there is a malfunction in all the Hall ICs 54u to 54w, the motor drive control device 1 estimates the position of the rotor without using the position detection signals Hu to Hw, and generates the drive voltages SU1 to SW1. . Therefore, the motor 51 can continue to rotate without being affected by the position detection signals Hu to Hw output from the defective Hall ICs 54 u to 54 w.

(F)
Further, since the motor drive control device 1 includes the display unit 5a that displays that the abnormality detection unit 2 has detected the abnormality of the position detection signals Hu to Hw, the user has a problem with the Hall ICs 54u to 54w. I can know that.

(G)
In addition, the motor drive control device 1 includes a receiving unit 5b that can receive an instruction to execute the above operation by the drive voltage generating unit 7. Therefore, even if the user has an abnormality in the Hall ICs 54u to 54w and the display unit 5a indicates that the abnormality is detected, the user determines whether or not the drive voltage generation unit 7 performs the above-described operation. Can be selected and instructed via remote controller. Further, the motor drive control device 1 performs the generation operation of the drive voltages SU1 to SW1 based on the user's instruction even when at least one of the position detection signals Hu to Hw is abnormal, so that the brushless DC motor 51 can be driven.

(5) Modified Example In the above embodiment, when the specifications of the Hall ICs 54u to 54w are unknown, or to which port the position detection signals Hu to Hw output from the Hall ICs 54u to 54w are input to the gate control signal generation unit 9. If it is unclear whether it is to be performed, the motor 51 can be rotated more reliably by using the following method.

  FIG. 7 is a configuration diagram of an entire motor drive control system 100 ′ including a motor drive control device 1 ′ according to a modification of the first embodiment and a motor 51 that is driven and controlled by the motor drive control device 1 ′. is there. The motor drive control device 1 ′ includes a phase difference detection unit 12 in addition to the configuration of the motor drive control device 1 of FIG. 1. In FIG. 7, the configuration other than the phase difference detection unit 12 is the same as each configuration in the motor drive control system 100 in FIG. 1, and thus the same reference numerals as those in FIG. To do.

  The phase difference detection unit 12 includes the remaining position detection signals Hu to Hw (that is, normal position detection signals Hu to Hw) excluding the position detection signals Hu to Hw detected as abnormal, and normal position detection signals Hu to Hw. The phase differences from the induced voltages Vun to Vwn generated in the drive coils Lu to Lw of the motor 51 corresponding to the above are detected. For example, when the position detection signal Hu is abnormal, the phase difference detection unit 12 calculates the phase difference between the position detection signals Hv and Hw and the induced voltages Vvn and Vwn generated in the drive coils Lv and Lw of the motor 51. To detect. Here, it is assumed that the phase difference detection unit 12 according to the present modification detects a phase difference when one or two Hall ICs 54u to 54w are abnormal among the three Hall ICs 54u to 54w.

  The gate control signal generation unit 9 generates gate control signals Gu to Gz based on the phase difference detected by the phase difference detection unit 12 and the polarities of the normal position detection signals Hu to Hw. For example, when the position detection signal Hu is abnormal, the gate control signal generation unit 209 determines the gate control signal Gu based on the phase difference regarding the position detection signals Hv and Hw and the polarities of the position detection signals Hv and Hw. ~ Gz is generated. In this case, the output voltage is output from the output circuit 210 based on the phase difference regarding the position detection signals Hv and Hw and the polarities of the position detection signals Hv and Hw.

  Thus, if the specifications of the Hall ICs 54u to 54w are unknown, even if a malfunction occurs in the Hall ICs 54u to 54w, the motor 51 rotates normally without being affected by the malfunctioned Hall ICs 54u to 54w. can do.

  When all of the Hall ICs 54u to 54w are out of order, the motor 51 estimates the position of the rotor 53 by the sensorless position estimation unit 6 and drives based on the estimated position, as in the first embodiment.

<Second Embodiment>
In the said 1st Embodiment, although the drive control method of the motor 51 when abnormality occurred in Hall IC54u-54w in the middle of the rotation of the motor 51 was demonstrated, before starting of the motor 51 in 2nd Embodiment. A method for reliably starting the motor 51 when at least one of the Hall ICs already has an abnormality will be described. FIG. 8 is a configuration diagram of an entire motor drive control system 200 including a motor drive control device 101 according to the second embodiment and a motor 51 that is driven and controlled by the motor drive control device 101.

  Here, since the motor 51 according to the present embodiment has the same configuration as the motor 51 of the first embodiment, the same reference numerals as those in FIG. 1 are given. That is, the motor 51 is a fan motor for outdoor units, and includes a stator 52 including U-phase, V-phase, and W-phase drive coils Lu to Lw, a rotor 53 having a plurality of magnetic poles, and Hall ICs 54u to 54w. A three-phase brushless DC motor provided.

(1) Configuration of Motor Control Drive Device The motor drive control device 101 includes an abnormality detection unit 102, a rotation speed detection unit 103, a rotation direction detection unit 104, a display unit 105a, a reception unit 105b (corresponding to an instruction reception unit), and a sensorless position. An estimation unit 106, a drive voltage generation unit 107 (corresponding to a fixed voltage generation unit and a drive voltage generation unit), and a position determination unit 112 are provided. The drive voltage generation unit 107 includes an abnormal position estimation unit 108, a gate control signal generation unit 109, and an output circuit 110. Note that the abnormality detection unit 102, the rotation number detection unit 103, the rotation direction detection unit 104, the display unit 105a, the sensorless position estimation unit 106, the abnormal time position estimation unit 108 of the drive voltage generation unit 107, and the output circuit 110 are described as follows. When the abnormality is detected in the abnormality detection unit 2, the rotation speed detection unit 3, the rotation direction detection unit 4, the display unit 5a, the sensorless position estimation unit 6, and the drive voltage generation unit 7 according to FIG. Since the configuration is similar to that of the position estimation unit 8 and the output circuit 10, detailed description thereof is omitted. Hereinafter, the position determination unit 112, the gate control signal generation unit 109, and the reception unit 105b, which are one feature of the present embodiment, will be described.

(Positioning part)
The position determination unit 112 determines a predetermined position of the rotor 53 such that when at least one of the Hall ICs 54u to 54w is abnormal, torque in the forward rotation direction is generated when the drive voltages SU2 to SW2 for starting the motor 51 are applied. To decide. Note that the abnormality detection unit 102 according to the present embodiment detects abnormality of the Hall ICs 54u to 54w before the motor 51 is started. Therefore, the position determination unit 112 performs an operation of determining a predetermined position of the rotor 53 before the motor 51 performs normal rotation, that is, before the motor 51 is started. If an abnormality is detected, a message to that effect is displayed on the display unit 105a.

  Here, how the position determination unit 112 determines the predetermined position of the rotor 53 will be described. For example, when drive voltages SU2 to SW2 for starting the motor 51 are generated using all the position detection signals Hu to Hw when the position detection signal Hu output from the Hall IC 54u is abnormal, as shown in FIG. In addition, an unbalanced period occurs in the drive voltages SU2 to SW2. Specifically, in FIG. 9, the drive voltages SU2 to SW2 are in a balanced state during the period A of about 210 degrees to about 30 degrees at the position of the rotor 53, and torque is generated in the forward rotation direction. The drive voltages SU2 to SW2 (particularly the U-phase and W-phase drive voltages SU2 and SW2) are in an unbalanced state during a period B of about 30 degrees to about 210 degrees at the position 53. Therefore, in such a case, the position determination unit 112 determines the predetermined position of the rotor 53 to be a position corresponding to about 210 degrees in the position of the rotor 53. That is, the position determination unit 112 determines the predetermined position of the rotor 53 to a position where the drive voltages SU2 to SW2 applied to the respective phases are in a balanced state.

[Gate control signal generator]
The gate control signal generation unit 109 generates gate control signals Gu to Gz for turning on and off the transistors Q1 to Q6 of the output circuit 110.

  In particular, when at least one of the Hall ICs 54u to 54w is abnormal, the gate control signal generation unit 109 according to the present embodiment has a rotor at a predetermined position determined by the position determination unit 112 before starting the motor 51. Gate control signals Gu to Gz are generated and output to the transistors Q1 to Q6 so that driving voltages SU2 to SW2 (corresponding to a fixed voltage) such that 53 is fixed are output to the motor 51. More specifically, the gate control signal generation unit 109 generates gate control signals Gu to Gz for exciting the rotor 53 so-called DC excitation before the motor 51 is started. As a result, the output voltage 110 outputs the drive voltages SU2 to SW2 (that is, the fixed voltage) for exciting the rotor 53 by direct current excitation to move the rotor 53 to a predetermined position and fix the rotor 53 to a predetermined position. Is fixed in place.

  Further, the gate control signal generation unit 109 according to the present embodiment determines the energization period of the drive voltages SU2 to SW2 based on the normal / abnormal state of the position detection signals Hu to Hw. Here, the energization period corresponds to a period in which the position detection signals Hu to Hw are normal and the drive voltages SU2 to SW2 applied to the drive coils Lu to Lw of each phase are balanced. Specifically, in FIG. 9, a period A from about 210 degrees to 30 degrees at the position of the rotor 53 corresponds to a normal period of the position detection signals Hu to Hw. In this case, the gate control signal generation unit 109 determines that the energization period is about 180 degrees.

  Thus, after the rotor 53 is moved and fixed to a predetermined position and the energization period of the drive voltages SU <b> 2 to SW <b> 2 is determined, the gate control signal generation unit 109 starts the drive voltage SU <b> 2 to SW <b> 2 for starting the motor 51. Gate control signals Gu to Gz corresponding to are generated. At this time, the gate control signal generation unit 109 continues to output the gate control signals Gu to Gz during the energization period. Then, drive voltages SU <b> 2 to SW <b> 2 for starting the motor 51 are output from the output circuit 110 and applied to the motor 51 during the determined energization period. As a result, a torque in the forward rotation direction is generated in the motor 51, and the motor 51 can be activated using the generated torque (ie, inertia force).

  In addition, after the motor 51 is started by the above-described method and reaches a normal rotation, the motor drive control device 101 may perform drive control using the method according to the first embodiment.

  In addition, when all of the Hall ICs 54u to 54w are not abnormal, the motor drive control device 101 performs driving for starting the motor 51 using all the position detection signals Hu to Hw so as to start the motor 51 as usual. Voltages SU <b> 2 to SW <b> 2 are generated and output to the motor 51.

[Receiver]
The receiving unit 105b can accept various driving instructions from the user made through the remote controller, like the receiving unit 5b according to the first embodiment. In particular, the receiving unit 105b receives an instruction to execute a predetermined position of the rotor by the position determining unit 112 and an instruction to execute the operation of generating the drive voltages SU2 to SW2 by the drive voltage generating unit 107 and an instruction to stop these operations. be able to.

  Therefore, as in the first embodiment, the drive voltage generation unit 107 may automatically perform the above-described operation when the position detection signals Hu to Hw are abnormal, and receives an execution instruction from the user. You may perform only when the part 105b receives.

(2) Effect (A)
When it is known in advance that the Hall ICs 54u to 54w have failed before starting the motor 51, the motor drive control device 101 generates torque in the forward rotation direction of the rotor 53 by DC excitation. After moving and fixing to a predetermined position, the motor 51 is started. As a result, immediately after the motor 51 is started, torque in the forward rotation direction is generated in the motor 51, so that the motor 51 can be started reliably.

  As described above, in this embodiment, since the motor 51 is activated using so-called inertia force, the motor drive control device 101 can be used when the load on the motor 51 is relatively large.

(B)
By the way, if at least one of the Hall ICs 54u to 54w is abnormal, the activated motor 51 may be affected by the position detection signals Hu to Hw output from the abnormal Hall ICs 54u to 54w. As a result, an increase in current passing through the motor 51, noise, vibration, and the like occur. However, the motor drive control device 101 outputs drive voltages SU2 to SW2 for starting the motor 51 during the energization period determined based on the normal / abnormal state of the position detection signals Hu to Hw, and other than the energization period. Stops outputting the drive voltages SU2 to SW2. As a result, the motor 51 is not affected by the position detection signals Hu to Hw that are abnormal even after startup.

(C)
The energization period is a period in which the position detection signals Hu to Hw are normal. As a result, the drive voltages SU2 to SW2 for starting the motor 51 are output to the motor 51 during a period in which the position detection signals Hu to Hw are normal.

(D)
Further, according to the motor drive control device 101, the abnormality detection unit 102 detects the abnormality of the Hall ICs 54u to 54w before the motor 51 is activated, so that the motor 51 is affected by the abnormal position detection signals Hu to Hw immediately after the activation. Can rotate without receiving.

(E)
As in the first embodiment, when an abnormality is detected in the position detection signals Hu to Hw, the fact is displayed on the display unit 105a, so that the user has a problem with the Hall ICs 54u to 54w. You can know that you are.

(F)
Similarly to the first embodiment, the motor drive control device 101 can receive an instruction to execute the operation by the drive voltage generation unit 107 via a remote controller. Therefore, even if the user has an abnormality in the Hall ICs 54u to 54w and the display unit 105a indicates that the abnormality is detected, the user determines whether or not to cause the drive voltage generation unit 107 to perform the above-described operation. Can be selected and instructed via remote controller. And the motor drive control apparatus 101 can start the brushless DC motor 51 by performing the said operation | movement based on a user's instruction | indication, also when at least 1 is abnormal among Hall IC54u-54w.

  In the present embodiment, as in the first embodiment, the case where the motor drive control device 101 drives and controls the fan motor 51 to which the propeller fan 61 is connected as a load is described. As described above, by using the motor 51 having a relatively large inertia (that is, the motor 51 to which a relatively large load is connected), the above effects (particularly, the effects (A), (B), and (C)) are further improved. Can play. For example, as described in effect (A), since the motor 51 is activated using so-called inertia force, the effect of reliably starting the motor 51 as the load connected to the motor 51 increases. You can play more. In the description of the effects (B) and (C), when the motor 51 having a relatively large inertia such as a fan motor has reached a non-energization period in which the output of the drive voltages SU2 to SW2 is stopped from the energization period, Since it rotates using inertia, it becomes difficult to stop.

<Third Embodiment>
In the third embodiment, when there is already an abnormality in at least one of the Hall ICs 54u to 54w before starting the motor 51, or when an abnormality has occurred in at least one of the Hall ICs 54u to 54w during normal rotation of the motor 51, Another method that can reliably start and drive the motor 51 will be described. FIG. 10 is a configuration diagram of an entire motor drive control system 300 including a motor drive control device 201 according to the third embodiment and a motor 51 that is driven and controlled by the motor drive control device 201.

  Here, since the motor 51 according to the present embodiment has the same configuration as the motor 51 of the first embodiment, the same reference numerals as those in FIG. 1 are given. That is, the motor 51 is a fan motor for outdoor units, and includes a stator 52 including U-phase, V-phase, and W-phase drive coils Lu to Lw, a rotor 53 having a plurality of magnetic poles, and Hall ICs 54u to 54w. A three-phase brushless DC motor provided.

(1) Configuration of Motor Drive Control Device The motor drive control device 201 activates the motor 51 by sensorless drive when a malfunction occurs in at least one of the Hall ICs 54u to 54w before the motor 51 is activated.

  As shown in FIG. 10, such a motor drive control device 201 includes an abnormality detection unit 202, a rotation speed detection unit 203, a rotation direction detection unit 204, a display unit 205a, a reception unit 205b (corresponding to an instruction reception unit), a sensorless A position estimation unit 206 and a drive voltage generation unit 207 are provided. The drive voltage generation unit 207 includes a gate control signal generation unit 209 and an output circuit 210. Note that the abnormality detection unit 202, the rotation number detection unit 203, the rotation direction detection unit 204, the display unit 205a, and the output circuit 210 of the drive voltage generation unit 207 are shown in FIG. 1 with the same names in the first embodiment. Since it has the same configuration as the output circuit 10 of the abnormality detection unit 2, the rotation number detection unit 3, the rotation direction detection unit 4, the display unit 5a, and the drive voltage generation unit 7 according to FIG. Hereinafter, the sensorless position estimation unit 206, the gate control signal generation unit 109, and the reception unit 205b, which are one feature of the present embodiment, will be described.

[Sensorless position estimation unit]
Similarly to the first embodiment, the sensorless position estimation unit 206 includes a position detection comparator and the like, and includes induced voltages Vun to Vwn generated in the motor 51 and a neutral point voltage of the motor 51 (specifically, a terminal TN of the motor 51). The position of the rotor 53 relative to the stator 52 is detected based on the voltage of That is, the sensorless position estimation unit 206 estimates the position of the rotor 53 without using the position detection signals Hu to Hw. The sensorless position estimation unit 206 may always function regardless of whether or not at least one of the position detection signals Hu to Hw is abnormal.

[Gate control signal generator]
When all the Hall ICs 54u to 54w are normal, the gate control signal generation unit 209 generates the gate control signals Gu to Gz based on the position detection signals Hu to Hw output from the Hall ICs 54u to 54w. The gate control signal generation unit 209 generates the gate control signals Gu to Gz regardless of the position of the rotor 53 when at least one of the Hall ICs 54 u to 54 w is abnormal. At this time, the output voltage 210 outputs drive voltages SU <b> 3 to SW <b> 3 for starting the motor 51 regardless of the position of the rotor 53. Specifically, the gate control signal generation unit 209 performs a so-called synchronous operation in which a predetermined voltage capable of starting the motor 51 is output at a predetermined frequency regardless of the position of the rotor 53 as the drive voltages SU3 to SW3. . At this time, the gate control signal generator 209 can smoothly accelerate the motor 51 by gradually increasing the predetermined voltage and the predetermined frequency. Furthermore, as described in the second embodiment, by fixing the rotor 53 at a predetermined position before starting the motor 51, the rotor 53 does not reverse at the start of the subsequent synchronous operation, so that the start is smoother. And acceleration is possible. The gate control signal generation unit 209 generates the gate control signals Gu to Gz based on the position of the rotor 53 estimated by the sensorless position estimation unit 206 when the induced voltage of the motor 51 is generated after the motor 51 is started. Generate. At this time, the output voltage 210 outputs drive voltages SU3 to SW3 for normal rotation of the motor 51, and the display 205a displays that an abnormality has been detected.

  If the abnormality detection unit 202 detects that at least one of the position detection signals Hu to Hw is abnormal while the motor 51 is rotating, the motor drive control device 201 rotates the motor 51. After stopping once, the above-described operation is performed.

[Receiver]
The receiving unit 205b can accept various driving instructions from the user made through the remote controller, similarly to the receiving units 5b and 105b according to the first and second embodiments. In particular, the receiving unit 205b instructs the execution of the operation for generating the drive voltages SU3 to SW3 by the drive voltage generation unit 207 (that is, the operation for generating the drive voltages SU3 to SW3 by the gate control signal generation unit 209), and these operations. Can receive a stop instruction. More specifically, the receiving unit 205 b generates the drive voltages SU <b> 3 to SW <b> 3 for starting the brushless DC motor 51 regardless of the position of the rotor 53 when the brushless DC motor 51 is started, and the brushless DC motor 51. After the activation, the operation execution instruction for generating the drive voltages SU3 to SW3 based on the estimated position of the rotor 53 can be received.

  Therefore, as in the first and second embodiments, the drive voltage generation unit 207 may automatically perform the above-described operation when the position detection signals Hu to Hw are abnormal, or may be executed by the user. The instruction may be given only when the receiving unit 205b receives the instruction.

(2) Effect (A)
The motor drive control device 201 performs sensorless drive on the motor 51 when any one of the Hall ICs 54u to 54w is abnormal. Therefore, even when at least one of the Hall ICs 54u to 54w is already abnormal before the start of the motor 51, or when at least one of the Hall ICs 54u to 54w is abnormal during normal rotation of the motor 51, the motor 51 It can be activated and driven without being affected by the abnormal Hall ICs 54u to 54w.

(B)
As in the first and second embodiments, if any one of the Hall ICs 54u to 54w is abnormal, the fact is displayed on the display unit 205a, so that the user has a problem with the Hall ICs 54u to 54w. You can know what is happening.

(C)
Similarly to the first and second embodiments, the motor drive control device 201 can receive an instruction to execute the operation by the drive voltage generation unit 207 via a remote controller. Therefore, even if the user has an abnormality in the Hall ICs 54u to 54w and the display unit 205a indicates that the abnormality is detected, the user determines whether or not to cause the drive voltage generation unit 207 to perform the above-described operation. Can be selected and instructed via remote controller. And the motor drive control apparatus 201 can start and drive the brushless DC motor 51 by performing the said operation | movement based on a user's instruction | indication, also when at least one of Hall IC54u-54w is abnormal. .

<Other embodiments>
(A)
In the first to third embodiments, the case where the Hall IC is used as the position detection unit has been described. However, the position detection unit may be other than the Hall IC. Examples of the position detection unit according to the present invention include the following.
(I) A device that directly detects the position of the rotor 53 by a magnetic detection sensor, such as a Hall element or Hall IC.
(II) Indirectly detecting the position of the rotor 53 using induced voltages Vun, Vvn, Vwn generated in the drive coils Lu, Lv, Lw.

(B)
In the first embodiment, as shown in FIG. 5, the maximum number of normal position detection signals Hu to Hw is used (that is, two positions are used when there are two abnormal position detection signals Hu to Hw). Although the case where the drive voltages SU1 to SW1 are generated (using the detection signals Hu to Hw) has been described, the present invention is not limited to this. For example, when there are two normal position detection signals Hu to Hw, the drive voltages SU1 to SW1 may be generated using one position detection signal Hu to Hw. However, the motor 51 can be rotated more reliably by generating the drive voltages SU1 to SW1 using many normal position detection signals Hu to Hw.

(C)
In the first and second embodiments described above, when the position detection signals Hu to Hw are abnormal, the position estimation units 8 and 108 at the time of abnormality perform position estimation, and the result is used for generating the drive voltage. . However, when the position detection signals Hu to Hw are abnormal, the drive voltage may be generated using only the normal position detection signals Hu to Hw even if the position estimation by the abnormal position estimation units 8 and 108 is not performed. .

  As a method for generating the drive voltage using only the normal position detection signals Hu to Hw, for example, the drive voltage is generated when the number of normal position detection signals Hu to Hw is one or two. There is a method in which the pattern of the driving voltage to be set is set in advance. In this method, when an abnormality occurs in at least one of the position detection signals Hu to Hw, the brushless DC motor 51 is selected from the drive voltage patterns set in advance based on the remaining normal position detection signals Hu to Hw. A drive voltage pattern to be output is selected, and the selected drive voltage pattern is generated and output to the brushless DC motor 51.

  Specifically, for example, when the position detection signal Hu is abnormal, the drive voltage generator 7 selects a pattern of the drive voltages SU1 to SW1 based on the position detection signals Hv and Hv that are not abnormal. The embodiment in this case will be described with reference to FIG. 6 described above. When the position detection signals are only “Hv” and “Hw”, the combination of the position detection signals is any when the signals are both “0”. When one of them is “1”, there are four patterns when the signal is “1”. Therefore, the drive voltage generator 7 has patterns of the drive voltages SU1 to SW1 corresponding to the four patterns (FIG. 6). For example, when the position detection signals Hv and Hw are both “1”, the drive voltage generator 7 selects the energization pattern “1”, the position detection signal Hv is “0”, and the position detection signal Hw is “1”. In the case of “1”, the energization pattern “2” is selected.

  Thus, when one of the three position detection signals Hu, Hv, and Hw is abnormal and cannot be used (in the above specific example, the position detection signal Hu is abnormal), the pattern of the drive voltages SU1 to SW1 There are four energization patterns. That is, when all three position detection signals Hu, Hv, and Hw are normal, there are six energization patterns. However, when one position detection signal becomes abnormal, the energization pattern is 2 than the original six patterns. There will be 4 streets with fewer streets. For this reason, the energization width of the drive voltages SU1 to SU1 is not uniform 120 degrees, and is 60 degrees, 120 degrees, and 180 degrees depending on the phase, and the values of the drive voltages SU1 to SW1 are also different values depending on the phase. Then, since the drive voltages SU1 to SW1 are balanced positively and negatively, the brushless DC motor 51 can operate stably.

(D)
In the first to third embodiments, the case where the motor drive control devices 1, 101, 201 drive the fan motor 51 in the outdoor unit of the air conditioner has been described as an example, but the present invention is not limited to this. The motor drive control devices 1, 101, and 201 according to the present invention can be applied to, for example, driving a ventilation fan motor.

(E)
In the first to third embodiments, the case where an insulated gate bipolar transistor is used as the output circuits 10, 110, and 210 has been described. However, the present invention is not limited to this. The output circuit may have a configuration using, for example, a MOS transistor instead of the insulated gate bipolar transistor.

(F)
In the first to third embodiments, the motor drive control devices 1, 101, 201 are described as including the rotation direction detection units 4, 104, 204 for detecting the rotation direction of the rotor 53, respectively. However, the present invention is not limited to this. When the motor drive control device is used, for example, for driving a motor that does not reversely rotate, the rotation direction detection unit may not be provided.

(G)
In the first and second embodiments, as shown in FIG. 1 and FIG. 8, a function unit that estimates the position of the rotor 53 when one or two Hall ICs 54 u to 54 w are abnormal (specifically, abnormal (Time position estimation unit) and a function unit (specifically, a sensorless position estimation unit) that estimates the position of the rotor 53 during sensorless driving are described separately. However, the position estimation of the rotor 53 when one or two Hall ICs 54u to 54w are abnormal and the position estimation of the rotor 53 at the time of sensorless driving may be performed by one functional unit. As a result, only one functional unit for estimating the position of the rotor 53 may be provided without being divided for sensorless driving and non-sensorless driving, so that the motor drive control device itself can be made relatively small. it can.

(H)
In the second embodiment, the drive voltage generation unit 107 generates a drive voltage for fixing the rotor 53 at a predetermined position (that is, a fixed voltage) and generates a drive voltage for starting the motor 51. Explained. However, the functional units that generate these types of drive voltages may be configured separately. That is, a fixed voltage generating unit that generates a driving voltage (that is, a fixed voltage) for fixing the rotor 53 at a predetermined position and a driving voltage generating unit that generates a driving voltage for starting the motor 51 are separately provided. It may be provided.

(I)
In the second embodiment, the case where the energization period of the drive voltages SU2 to SW2 is determined based on the normal / abnormal state of the position detection signals Hu to Hw has been described. However, with this method, there is a risk that the energization period may be reduced compared to the normal period. In order to improve this and set the energization period to a 360-degree period corresponding to normal time, the drive voltage generation unit 107 performs so-called synchronous operation in which a predetermined voltage capable of starting the motor 51 is output at a predetermined frequency. You may do it. At this time, the drive voltage generation unit 107 can accelerate the motor 51 smoothly by gradually increasing the predetermined voltage and the predetermined frequency.

(J)
In the third embodiment, the case where the sensorless position estimation unit 206 estimates the position of the rotor 51 based on the induced voltage of the motor 51 has been described. However, the method by which the sensorless position estimation unit 206 estimates the position of the rotor 51 is not limited to this method. Other methods for estimating the position of the rotor 51 include a method for estimating the position of the rotor 53 by superimposing high-frequency signals on the drive voltages SU3 to SW3 and outputting the same to the motor 51, an electrical model of the motor 51, and a motor. For example, a method for estimating the position of the rotor 51 based on the voltage applied to the motor 51 or the current flowing through the motor 51 may be used.

  The motor drive control device according to the present invention can be applied as a device for controlling the drive of a motor for a brushless motor or a ventilation fan used as a rotational drive source such as a compressor and a fan in an air conditioner.

1, 101, 201 Motor drive control device 2, 102, 202 Abnormality detection unit 3, 103, 203 Rotation speed detection unit 4, 104, 204 Rotation direction detection unit 5a, 105a, 205a Display unit 5b, 105b, 205b Reception unit 6 , 106, 206 Sensorless position estimation unit 7, 107, 207 Drive voltage generation unit 8, 108 Abnormal position estimation unit 9, 109, 209 Gate control signal generation unit 10, 110, 210 Output circuit 12 Phase difference detection unit 51 Brushless DC Motor 52 Stator 53 Rotor 54 Hall IC
61 Fan 112 Position determination unit Lu, Lv, Lw Drive coils SU1 to SW1, SU2 to SW2, SU3 to SW3 Drive voltage Gu to Gz Gate control signal Hu to Hw Position detection signals Hu1 ′ to Hw1 ′ Sensorless position estimation signal Hu2 ′ to Hw2 'Abnormal position estimation signal

JP-A-8-331886 JP 2000-184774 A

Claims (12)

A stator (52) having a drive coil (Lu to Lw), a rotor (53) having a plurality of magnetic poles, and a position detection signal (Hu) indicating the position of the rotor (53) with respect to the stator (52) A motor drive control device (1, 101) for driving and controlling a brushless DC motor (51) including a plurality of position detection units (54u to 54w) that output (Hw).
An abnormality detection unit (2,102) for detecting an abnormality of each of the position detection signals (Hu to Hw);
When an abnormality of at least one of the position detection signals (Hu to Hw) is detected by the abnormality detection unit (2, 102), the remaining positions excluding the position detection signals (Hu to Hw) detected as abnormal Based on at least one of the detection signals (Hu to Hw), driving voltages (SU1 to SW1, SU2 to SW2) for driving the brushless DC motor (51) are generated to generate the brushless DC motor (51). A drive voltage generator (7, 107) that outputs to
With
The drive voltage generation unit (7, 107) determines an energization period of the drive voltage based on a normal / abnormal state of the position detection signal at least when the motor (51) is started. Output drive voltage,
Motor drive control device (1, 101). The drive voltage generator (7) uses the rotor (53) by using at least one of the remaining position detection signals (Hu to Hw) excluding the position detection signals (Hu to Hw) detected as abnormal. ) And the drive voltages (SU1 to SW1) are generated based on the estimated position of the rotor (53).
The motor drive control device (1) according to claim 1. The drive voltage generator (7) is set in advance based on at least one of the remaining position detection signals (Hu to Hw) excluding the position detection signals (Hu to Hw) detected as abnormal. A pattern of the drive voltage (SU1 to SW1) to be output to the brushless DC motor (51) is selected from the pattern of the drive voltage (SU1 to SW1), and the pattern is output to the brushless DC motor (51).
The motor drive control device (1) according to claim 1. A rotation speed detector for detecting the rotation speed of the rotor (53) using at least one of the remaining position detection signals (Hu to Hw) excluding the position detection signals (Hu to Hw) detected as abnormal. (3) is further provided,
The drive voltage generator (7) further adjusts the drive voltages (SU1 to SW1) according to the rotation speed of the rotor (53) detected by the rotation speed detector (3).
The motor drive control device (1) according to any one of claims 1 to 3. The position detection unit (54u to 54w) is one of a Hall element and a Hall IC.
The motor drive control device (1) according to any one of claims 1 to 4. The remaining position detection signals (Hu to Hw) excluding the position detection signals (Hu to Hw) detected as abnormal and the drive coils (Lu to Lw) corresponding to the remaining position detection signals (Hu to Hw) ) Further comprising a phase difference detection unit (12) for detecting a phase difference from the induced voltage generated in each of them,
The drive voltage generator (7) generates the drive voltages (SU1 to SW1) based on the phase difference and the polarities of the remaining position detection signals (Hu to Hw).
The motor drive control device (1 ') according to any one of claims 1 to 5. A sensorless position estimation unit (6) that estimates the position of the rotor without using the position detection signals (Hu to Hw) when all the position detection signals (Hu to Hw) are detected as abnormal. ,
When the sensorless position estimation unit (6) estimates the position of the rotor, the drive voltage generation unit (7) does not use the position detection signals (Hu to Hw), and estimates the rotor The driving voltage (SU1 to SW) is generated using a position.
The motor drive control device (1) according to any one of claims 1 to 5. The energization period is a period in which the position detection signal is normal.
The motor drive control device (101) according to any one of claims 1 to 7. When the brushless DC motor (51) is started, a predetermined position of the rotor (53) is determined such that torque in the positive rotation direction is generated when the drive voltages (SU1 to SW1, SU3 to SW3) are applied. A position determining unit (112);
The drive voltage generation unit (107) generates the drive voltages (SU2 to SW2) such that the rotor (53) moves to the predetermined position, and the rotor (53) moves to the predetermined position. Then, the drive voltage (SU2 to SW2) for starting the brushless DC motor (51) is generated.
The motor drive control device (101) according to any one of claims 1 to 8. The abnormality detection unit (2) performs abnormality detection of the position detection signals (Hu to Hw) before starting the brushless DC motor (51).
The motor drive control device (1, 101) according to any one of claims 1 to 9. A display unit (5a) capable of displaying that the abnormality detection unit (2) has detected an abnormality in the position detection signals (Hu to Hw);
The motor drive control device (1) according to any one of claims 1 to 10. Execution of an operation in which the drive voltages (SU1 to SW1) are generated based on at least one of the remaining position detection signals (Hu to Hw) excluding the position detection signals (Hu to Hw) detected as abnormal. An instruction receiving unit (5b) capable of receiving instructions;
The motor drive control device (1) according to any one of claims 1 to 11.

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