JP2008017651A - Motor drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dramatically improve reliability, safety and the like in a device by preventing a motor drive unit from resulting in excessive output failure by erroneous control, when a circuit failure such as a transistor failure occurs in the output circuit of a rotation detection pulse in a motor (brushless motor) to be controlled, and the rotation detection pulse cannot be transmitted and inputted to a control unit normally. <P>SOLUTION: An abnormality detector 14 detects an abnormality in the output circuit 19 from the mismatching of the rotation detection pulse PG at input and output sides of the output circuit 19 of a detection processor 13. A means for coping with the abnormality performs at least one of the control of an output stop at a motor drive part 12 and an abnormality detection report. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor drive device that drives a brushless motor, and more particularly, to countermeasures for failure of a circuit portion thereof.

  Conventionally, this kind of brushless motor represented by a three-phase brushless motor (also called a brushless DC motor or a brushless AC motor) is used in industrial equipment and consumer equipment for various purposes, and its drive control is performed by rotating the motor. This is performed by PWM control or the like based on detection (detection of rotor position) (for example, see Patent Document 1).

  The rotation detection is generally performed using a position detection sensor such as a Hall IC (or Hall element) or a resolver. When detecting using the Hall IC, for example, a brushless motor (hereinafter referred to as a control target) is controlled. A plurality of (specifically, for example, three for three-phase control) Hall ICs are arranged at regular intervals around a “control target motor”), and each rotor magnet of the motor or The position information of the three phases for detecting the rotation of the motor to be controlled from moment to moment is formed by the output of each Hall IC that changes when each magnet at the set interval of the dedicated magnet plate passes in the vicinity of each Hall IC.

  The rotation detection can also be performed by sensorless detection or detection by a small number of sensors, for example, one sensor. In the case of sensorless detection, as is well known, it is based on the back electromotive force waveform, current waveform, etc. of the motor to be controlled. According to the rotation of the motor, the same position information for rotation detection is formed. In the case of one sensor detection, for example, based on one pulse / one rotation sensor pulse of one Hall IC provided in the vicinity of the motor to be controlled. The rotational position of the motor at every moment is estimated, and the position information for the same rotation detection is formed by this estimation.

  Further, this type of motor drive device is roughly a main circuit unit, which will be described later, and a control unit as an “external controller” for supplying and controlling the main circuit unit when the motor to be controlled is a so-called drive circuit built-in type. Consists of.

  The main circuit unit performs logic processing on the position information after waveform shaping to form a rotation detection pulse or the like synchronized with the rotor rotation of the motor to be controlled, and a control target based on a control command from the control unit. A motor drive unit for supplying power to the motor is provided, and these circuit units are formed integrally with a control target motor together with a position detection sensor such as a Hall IC.

  On the other hand, the control unit separate from the main circuit unit (in other words, separate from the motor to be controlled) is composed of a power supply unit and a control circuit of a microcomputer (hereinafter referred to as “microcomputer”). It has a control function, a monitor function, etc., and supplies power to the main circuit unit with a DC motor driving power source and a control power source, and differential change of the rotation detection pulse transmitted from the detection processing unit of the main circuit unit ( The rotational speed of the motor to be controlled is detected based on a change in time, and a speed command for feedback control of the motor to be controlled is formed according to the deviation of the detected rotational speed from the target speed and output to the main circuit unit.

  Then, based on this speed command, the power supply from the motor drive section of the main circuit section to the control target motor is feedback controlled to rotate the control target motor at a desired speed (target speed).

  By the way, in such a motor drive device, if the motor to be controlled stops rotating for a certain period of time or becomes abnormally slow for some reason (hereinafter, this state is referred to as “rotation stopped state”). It is known that the inverter circuit of the motor drive unit is in an overpowered state in an attempt to increase the rotation speed of the motor to be controlled, and the motor drive unit may break down (destruct) due to element overheating or the like ( For example, see Patent Document 2.)

JP 2003-264990 A (abstract, paragraphs [0017]-[0030], FIG. 1 etc.) Japanese Patent Laid-Open No. 10-45012 (paragraph [0004], FIG. 1 etc.)

  In the conventional motor drive device, when an abnormality occurs in which the motor to be controlled is in a rotation stop state, the controller detects the occurrence of the abnormality because the rotation detection pulse is not continuously transmitted for more than the predetermined time. It is conceivable to notify the user.

  However, even when such a configuration is adopted, when a circuit failure such as a transistor failure occurs in the rotation detection pulse output circuit of the detection processing unit and the rotation detection pulse is not normally transmitted and input to the control unit, the detection is detected. As a result, the control unit tries to further increase the rotation speed of the control target motor even though the rotation detection pulse is normally generated along with the rotation of the control target motor. The inverter circuit or the like of the motor drive unit is in an excessive output state, resulting in a failure of the motor drive unit.

  In other words, it is difficult to reliably detect abnormalities in the circuit failure of the output circuit of the main circuit unit and to prevent failure (destruction) of the motor drive unit with reliability only by detection on the control unit side. There is a problem that sufficient improvement in safety and safety cannot be achieved.

  This problem also occurs when the motor to be controlled is not a drive circuit built-in type.

  The present invention has been made in consideration of the above-mentioned points. When a circuit failure such as a transistor failure occurs in the output circuit of the rotation detection pulse of the motor to be controlled, the rotation detection pulse is normally transmitted and input to the control unit. The purpose is to drastically improve the reliability, safety, etc. of the device so that the motor drive unit does not cause an overpower failure due to erroneous control when it is lost.

  In order to solve the above-described problem, the motor drive device of the present invention is synchronized with the rotation of the brushless motor based on the motor drive unit that feeds and drives the brushless motor to be controlled and the position information of the rotation detection of the brushless motor. A motor drive device comprising: a detection processing unit that forms a rotation detection pulse; and a control unit that feedback-controls power supply from the motor drive unit to the brushless motor based on the rotation detection pulse output from the detection processing unit. An abnormality detection unit for detecting an abnormality in the output circuit from a mismatch between the rotation detection pulses on the input side and the output side of the output circuit of the detection processing unit, and the motor driving unit by detecting an abnormality in the abnormality detection unit And an abnormality coping means for performing at least one of output stop control and abnormality detection notification. (Claim 1).

  The motor drive device of the present invention is the motor drive device according to claim 1, wherein the motor drive unit, the detection processing unit, the abnormality detection unit, and the abnormality handling unit are integrally incorporated in the brushless motor. A main circuit unit is formed together with the brushless motor, and the control unit separate from the main circuit unit captures the rotation detection pulse of a predetermined signal output pin of the main circuit unit by wire or wirelessly, and A speed command of the brushless motor is output to a predetermined signal input pin, and the rotation detection pulse of the signal output pin forms the rotation detection pulse on the output side of the output circuit. .

  Furthermore, the motor drive device of the present invention is the motor drive device according to claim 1 or 2, wherein the motor drive unit includes an inverter circuit and a PWM circuit that drives the inverter circuit, and the control unit outputs the rotation output. Based on the pulse, a speed command for feedback control of the brushless motor is formed and transmitted to the PWM circuit (claim 3). In this case, the output stop control of the motor drive unit of the abnormality coping means is also the output stop control of the PWM circuit (claim 4).

  First, according to the configuration of the first aspect, the position information of the rotation detection of the motor to be controlled is normally formed, but the output circuit of the detection processing unit fails, and the rotation detection pulse is normally sent to the control unit. When an abnormality that prevents transmission occurs, the rotation detection pulses on the input side and output side of the output circuit do not match (do not match), so the abnormality detection unit reliably detects the occurrence of this abnormality and Based on this, at least one of the output stop of the motor driving unit and the notification of the abnormality detection is performed by the abnormality handling means.

  Therefore, when a circuit failure such as a transistor failure occurs in the rotation detection pulse output circuit of the detection processing unit and the rotation detection pulse is not normally transmitted to the control unit, the abnormality is reliably detected and this detection is performed. Based on the above, at least one of the output stop of the motor drive unit and the notification of abnormality detection is performed so that the motor drive unit does not cause an excessive output failure, and the reliability, safety, etc. of the device are drastically improved. be able to.

  Next, according to the configuration of claim 2, the control target motor is a so-called drive circuit built-in type, and the motor drive unit, the detection processing unit, the abnormality detection unit, and the abnormality coping means are integrally incorporated in the control target motor. A main circuit unit, and a control unit separate from the motor to be controlled captures the rotation detection pulse of a predetermined signal output pin of the main circuit unit by wire or wirelessly to a predetermined signal input pin of the main circuit unit. In a motor driving device having a specific configuration in which a speed command for a control target motor is output and the control target motor is feedback-controlled by the speed command, the second abnormality detection unit detects a rotation detection pulse of the signal output pin and a detection processing unit. By detecting the abnormality of the output circuit from the mismatch with the rotation detection pulse on the input side of the output circuit, the same effect as in the first aspect can be obtained.

  Next, according to the configuration of claim 3, the motor drive device having the configuration of claim 1 or 2, wherein the motor drive unit further includes an inverter circuit and a PWM circuit for driving the inverter circuit, and the control In a more specific configuration in which the unit controls the rotation of the motor to be controlled by controlling the inverter circuit via the PWM circuit of the motor drive unit according to the speed command formed by the control unit by feedback control based on the rotation detection pulse, The same effects as in claims 1 and 2 can be obtained. At this time, it is practically preferable that the abnormality coping processing means stop the output of the PWM circuit and realize the output stop of the motor drive unit as in claim 4.

  An embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a circuit block diagram of a motor drive control device when the motor to be controlled is a so-called built-in drive circuit type, and FIG. 2 is a detailed connection diagram of a part of FIG.

  In FIG. 1, reference numeral 1 denotes a control target motor (brushless motor), and 2 denotes a position detection sensor unit that detects rotation of the control target motor 1. For example, one or a plurality of position detection sensors provided around the rotor of the control target motor 1. It consists of a Hall element IC circuit (Hall IC). Reference numeral 3 denotes a main circuit unit, which is formed by integrating the position detection sensor unit 2 and each circuit unit described later into the motor 1 to be controlled. Reference numeral 4 denotes a control unit that is separate from the main circuit unit 3 (in other words, separate from the controlled motor 1), and is connected to the main circuit unit 3 via, for example, a plurality of connection lines 5 a to 5 e of the connection cable 5. Thus, an “external controller” for supplying and controlling the main circuit unit 3 is formed.

  The control unit 4 includes a power supply unit 6 and a microcomputer control circuit 7. In the power supply unit 6, for example, an AC 200 V commercial AC power supply 8 is passed through a noise removal filter unit 9 rectifying / smoothing unit 10 and a stabilized power supply unit 11. The rectifying / smoothing unit 10 forms a DC 280V DC driving power source VM necessary for driving the motor 1 to be controlled, and the stabilizing power source unit 11 stabilizes the main circuit unit 3 and the control unit 4 such as DC 15V. A direct circuit power supply (control power supply) Vcc is formed.

  Further, the drive power supply VM of the rectifying / smoothing unit 10 is sent from the drive power supply output pin 4a of the control unit 4 to the drive power supply input pin 3a of the main circuit unit 3 through the connection line 5a, and the circuit power supply of the stabilized power supply unit 11 Vcc is sent from the circuit power output pin 4b of the control unit 4 to the circuit power input pin 3b of the main circuit unit 3 through the connection line 5b.

  In addition, the control circuit 7 of the control unit 4 forms a speed command Vsp of the control target motor 1 and feedback-controls the power supply to the control target motor 1 of the main circuit unit 3. A later-described rotation detection pulse PG transmitted and input to the input pin 4c is captured, and the rotation speed of the control target motor 1 is detected from the pulse period of the acquired rotation detection pulse PG, as in the known feedback control of the speed of the brushless motor.

  Further, an error (deviation) between the detected rotation speed and the set target speed is detected, and changes according to the detected error. In other words, the rotation speed of the motor 1 to be controlled becomes larger as the rotation speed becomes lower than the target speed. A DC speed command Vsp is formed, and a DC signal of the speed command Vsp is output from the signal output pin 4d of the control unit 4 to the connection line 5d.

  Note that the DC signal of the speed command Vsp changes, for example, in the range of DC 0 to 5 V in proportion to the error, and is DC 2.5 V when the error is zero.

  Next, the main circuit unit 3 rotates the rotor of the target motor 1 based on the output of the motor drive unit 12 that feeds and drives the control target motor 1 based on the drive power source VM of the drive power input pin 3a and the position detection sensor unit 2. Are provided with a circuit part such as a detection processing unit 13 and an abnormality detection unit 14 and an overcurrent protection unit 15 that form a rotation detection pulse PG and a timing gate pulse necessary for PWM control.

  In this embodiment, the motor drive unit 12 feeds and drives the motor 1 to be controlled by a method that is practical, has high power supply efficiency, and high control accuracy. Therefore, the inverter circuit 16 for power and a PWM circuit that controls the drive thereof are used. 17.

  The detection processing unit 13 includes a logic circuit 18 and a rotation detection pulse PG output circuit 19.

  The PWM circuit 17 of the motor drive unit 12, the logic circuit 18 of the detection processing unit 13, the abnormality detection unit 14, and the overcurrent protection unit 15 are formed by a single logic IC 20.

  Then, the logic circuit 18 receives position information signals of, for example, three Hall ICs of the position detection sensor unit 2 from time to time, and is necessary for the three-phase PWM control, for example, by logic gate processing of these signals. A total of six timing gate pulses for each phase are formed and output to the PWM circuit 17, and at the same time, a rotation detection pulse PG every 30 electrical angles synchronized with the rotor rotation of the motor 1 to be controlled, that is, 12 ppr ( ppr is a pulse / rotation), and this rotation detection pulse PG is output from the output circuit 19 to a predetermined signal output pin 3d of the main circuit unit 3, and from this signal pin 3d to the signal line 5c, The signal is transmitted to the control circuit 7 of the control unit 4 through the signal input pin 4c.

  The ground pin 3e of the main circuit unit 3 and the ground pin 4e of the control unit 4 are grounded and connected by a connection line 5e.

  On the other hand, the inverter circuit 16 of the motor drive unit 12 is composed of a well-known bridge circuit using a power switching semiconductor such as an FET or IGBT, and is configured by a three-phase full bridge circuit when the controlled motor 1 is driven in three phases. Then, based on the switching control output of each phase of the PWM circuit 17 (for example, two outputs for each phase), the switching target motor 1 is fed and driven by high-frequency switching of each switching semiconductor by PWM control of several tens of KHz, for example.

  The PWM circuit 17 uses a speed command Vsp transmitted and input to a predetermined signal input pin 3c of the main circuit unit 3 as a signal wave, and a high frequency (several tens KHz) formed by this signal wave and free-running oscillation or the like. By comparing the level with a triangular wave (or sawtooth) carrier wave, a PWM signal whose duty (energization period) changes according to the speed command Vsp is formed, and the PWM signal and each of the timings input from the logic circuit 18 are formed. Based on the gate pulse, the switching control output of each phase is formed and supplied to the inverter circuit 16.

  Then, the high frequency switching of the inverter circuit 18 based on the feedback control of the speed command Vsp causes the control target motor 1 to be rotated at a target speed set by being driven by, for example, three-phase PWM control.

  Next, detection of an abnormality in the main circuit unit 3 will be described.

  In this embodiment, an abnormality of the main circuit unit 3 is detected on the control unit 4 side, and in particular, a circuit failure of the output circuit 19 of the detection processing unit 13 is also detected on the main circuit unit side, and is surely performed by so-called “double check”. This prevents the failure (destruction) of the motor drive unit 12 and reliably improves reliability, safety, and the like.

  In order to detect that some abnormality has occurred in the control target motor 1 or the motor drive unit 12 of the main circuit unit 3 on the control unit 4 side, the control circuit 7 is provided with first abnormality detection means described next.

  By the way, when some abnormality occurs in the control target motor 1 or the motor drive unit 12 and the control target motor 1 enters the rotation stop state described above, the position information of the rotor rotation of the control target motor 1 continuously disappears for a certain period or more. With this disappearance, the rotation detection pulse 7 is input to the control circuit 7 for more than the abnormality detection time set.

  When the rotation detection pulse 7 is not input to the control circuit 7 for more than the abnormality detection time set in the control circuit 7, the first abnormality detection means of the control circuit 7 applies to the controlled motor 1 or the motor drive unit 12 of the main circuit unit 3. Recognize and detect that some abnormality has occurred. Note that the abnormality detection time is set based on experiments or the like so that erroneous detection does not occur due to one (or several) missing of the rotation detection pulse PG due to transient fluctuation or the like.

  Then, by detecting the abnormality of the first abnormality detecting means, for example, the speed command Vsp is turned off to forcibly stop the inverter circuit 16 or the abnormality notifying means provided in the control unit 4 is driven, The occurrence of an abnormality in the main circuit unit 3 is notified by one or both of notification of occurrence by sound (voice), visual notification such as lamp lighting (flashing), and failure of the motor drive unit 12 or the like ( (Destruction) is prevented.

  Next, a position information signal of the rotor rotation is normally output from the position detection sensor unit 2 and the rotation detection pulse PG is normally generated. However, a circuit such as a transistor failure is provided in the output circuit 19 of the detection processing unit 13. When a failure occurs and an abnormality occurs in which the rotation detection pulse PG is not normally transmitted from the signal output pin 3d to the control circuit 7 of the control unit 4 via the signal line 5c and the signal input pin 4c, the rotation pulse PG is completely There is a risk that it will not disappear and may be overlooked without being detected by the first abnormality detecting means of the control circuit 7, or the detection may be delayed. When such a situation occurs, it is based on an excessive speed command Vsp. As a result, the inverter circuit 16 becomes overpowered and the motor drive unit 12 is damaged.

  Therefore, in this embodiment, as the second abnormality detection means, an abnormality detection unit 14 is provided in the main circuit unit 3, and the abnormality detection unit 14 uses the rotation detection pulse PG on the input side of the output circuit 19 and the rotation on the output side. The detection pulse PG is compared, the abnormality of the circuit failure of the output circuit 19 is detected from the mismatch (mismatch) of the rotation detection pulses PG on both sides, and the abnormality detection signal S is output.

  Then, the abnormality detection signal S is supplied to the logic circuit 18 as, for example, an output-prohibited gate signal, the output gate of the logic circuit 18 is turned off by this gate signal, and the output of each timing gate pulse to the PWM circuit 17 is prohibited. To do.

  In other words, in this embodiment, the logic circuit 18 is provided with output gate means for prohibiting the output of each timing gate pulse to the PWM circuit 17 as an abnormality handling means, and the output gate means causes an abnormality of the abnormality detection unit 14. Based on the detection, the output of each timing gate pulse to the PWM circuit 17 is prohibited.

  Then, by prohibiting this output, the switching control output of each phase from the PWM circuit 17 to the inverter circuit 16 is turned off to forcibly stop the motor drive unit 12 so that the output circuit 17 has a transistor failure or the like. When the abnormality occurs, an excessive output of the inverter circuit 18 based on the abnormal (excessive) speed command Vsp is detected on the main circuit unit 3 side automatically to prevent a failure (damage) of the motor drive unit 12. The reliability and safety are sufficiently improved by the "double check" described above.

  Incidentally, as shown in FIG. 2, the output final stage of the output circuit 19 is composed of a collector follower transistor TR, and the rotation detection pulse PG is output from the collector of this transistor TR to the signal output pin 3d. When the rotation detection pulse PG on the output side of the collector of the transistor TR has an inverted waveform that is shifted by 180 degrees with respect to the rotation detection pulse PG on the input side, the anomaly detection unit 14 is, for example, the exclusive OR gate 14a shown in FIG. By comparing the rotation detection pulse PG on the input side with the rotation detection pulse PG on the output side logically inverted, the rotation detection on the input side and the output side based on the open breakdown between the collector and the emitter of the transistor TR is detected. The mismatch of the pulse PG can be easily detected. In FIG. 2, R is a collector resistance of the transistor TR, and + B is a power supply terminal.

  Furthermore, the abnormality detection unit 14 uses, for example, the output of the exclusive OR gate 14a as the abnormality detection signal S, and detects a mismatch between the rotation detection pulse PG on the input side of the output circuit 19 and the rotation detection pulse PG on the output side. Then, the abnormality detection signal S may be output immediately, but in the case where reliability is improved so that erroneous detection does not occur due to transient fluctuations of the rotation detection pulse PG on the input side and the output side, For example, the counter 14b in FIG. 2 counts the rise change from the low level to the high level of the comparison output of the rotation detection pulse PG between the input side and the output side of the output circuit 17 by the exclusive OR gate 14a, and performs an experiment or the like. When the inconsistency is continuously detected a set number of times based on the counter 14b and the count value of the counter 14b reaches the set value, the abnormality detection signal S is output from the counter 14b. It is sufficient.

  When the output gate means of the logic circuit 18 as the abnormality coping means is formed by the output gate portion 18a having the AND gate structure of FIG. 2, the abnormality detection signal S is a low level signal.

  The main circuit unit 3 is also provided with peripheral circuit units such as an overcurrent protection unit 15. When the motor current of each phase of the controlled motor 1 becomes a set overcurrent, the overcurrent protection unit 15 The switching semiconductor of each phase of the circuit 16 is forcibly fixed in the off state to protect the controlled motor 1 and the motor driving unit 3 from overcurrent.

  As described above, in the case of this embodiment, in the motor drive device with a built-in drive circuit including the main circuit unit 3 integrally incorporated in the controlled motor 1 and the separate control unit 4, the main circuit unit 3 When an abnormality of a circuit failure such as a transistor failure occurs in the output circuit 19 of the rotation detection pulse PG of the detection processing unit 13 provided in the main circuit 3 side, the abnormality detection unit 14 provided in the main circuit unit 3 detects the abnormality. It detects quickly and surely, and the abnormality coping means automatically (forcedly) stops the output of the PWM-controlled motor drive unit 12 to ensure failure of the motor drive unit 12 based on the abnormal speed command Vsp. Can be prevented.

  Therefore, with a simple configuration in which the main circuit unit 3 is provided with the abnormality detection unit 14 and the abnormality coping means, the circuit abnormality of the output circuit 19 of the main circuit unit 3 can be detected as “double” between the control unit 4 side and the main circuit unit 3 side. It is possible to reliably prevent a failure or the like of the motor drive unit 12 based on the abnormal speed command Vsp detected by the “check”, and to dramatically improve the reliability and safety of the motor drive device.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the gist thereof. For example, in the above-described embodiment, an abnormality The coping means controlled the motor drive unit 12 to stop output based on the abnormality detection signal S of the abnormality detection unit 14, but instead of controlling the motor drive unit 12 to stop output, it is provided on the main circuit unit 3 side. The notification means may be driven to notify the occurrence of an abnormality by either or both of a sound notification by sound (voice) and a visual notification such as lamp lighting (flashing). The motor drive unit 12 may be controlled to stop output based on the abnormality detection signal S of the abnormality detection unit 14, and at the same time, the occurrence of abnormality may be notified by the notification means.

  In addition, the configuration of each of the units 12 to 15 and the configuration of the control unit 4 of the main circuit unit 3 are not limited to those of the above-described embodiment. For example, the control target motor 1 is controlled in position feedback control or speed and position control. The present invention can be similarly applied to the case of driving by multiple feedback control or the like, and the present invention can also be applied to the case where the motor driving unit 12 is a control method other than PWM control.

  Further, for example, the detection processing unit 13, the abnormality detection unit 14, the PWM circuit 17 and the like of the main circuit 3 may be configured by software processing of a microcomputer.

  Also, instead of the main circuit unit 3 and the control unit 4 being wired by the connection cable 5, a transmission / reception unit is provided in each of the main circuit unit 3 and the control unit 4, and both the units 3 and 4 are wirelessly connected. 4 may be configured to wirelessly capture the rotation detection pulse PG of the signal output pin 3d of the main circuit unit 3 and output the speed command Vsp to the signal input pin 3c of the main circuit unit 3.

  Further, the present invention can of course be applied to a case where the drive circuit is not a built-in type, and the main circuit unit 3 and the control unit 4 are formed on one circuit board regardless of whether the drive circuit is a built-in type. The present invention can be applied to motor drive control devices having various configurations.

  Further, in the above embodiment, the position detection sensor unit 2 is provided in the main circuit unit 3, and the rotational position of the rotor of the motor 1 to be controlled is detected by, for example, three Hall ICs of the position detection sensor unit 2. Although the position information of the control target motor 1 is obtained, the position information of the control target motor 1 is obtained by well-known sensorless detection without providing the position detection sensor unit 2 and the back electromotive voltage waveform and current waveform of the control target motor 1. The position information may be detected by a configuration in which only one position detection sensor such as a Hall IC is provided in the position detection sensor unit 2 and the number of sensors is small.

  Of course, the rotation detection pulse PG may be a so-called FG pulse of an FG sensor, a detection pulse of a rotary encoder, or the like.

  Furthermore, in the above embodiment, the first abnormality detection means is provided in the control circuit 7 and the abnormality detection unit 14 is added to the main circuit unit 3 on the assumption that the control unit 4 detects an abnormality in the main circuit unit 3. However, the present invention is not configured to detect an abnormality of the main circuit unit 3 on the control unit 4 side, that is, the first abnormality detection unit is not provided. The present invention can also be applied to a configuration.

  The present invention can be applied to a motor drive control device when the control target motor 1 has various uses, various sizes, shapes, and output characteristics. In that case, the control target motor 1 is limited to one. Instead, for example, a plurality of units that are operated in parallel may be used.

It is a circuit block diagram of one embodiment of this invention. FIG. 2 is a detailed connection diagram of a part of FIG. 1.

Explanation of symbols

1 Controlled motor (brushless motor)
3 Main circuit unit 3c, 4c Signal input pin 3d, 4d Signal output pin 4 Control unit 6 Power supply unit 7 Control circuit 12 Motor drive unit 13 Detection processing unit 14 Abnormality detection unit 19 Output circuit PG Rotation detection pulse

Claims (4)

A motor drive unit that feeds and drives a brushless motor to be controlled;
A detection processing unit that forms a rotation detection pulse synchronized with the rotation of the brushless motor based on position information of rotation detection of the brushless motor;
In a motor drive device comprising: a control unit that feedback-controls power supply from the motor drive unit to the brushless motor based on the rotation detection pulse output from the detection processing unit;
An abnormality detection unit for detecting an abnormality in the output circuit from a mismatch between the rotation detection pulses on the input side and the output side of the output circuit of the detection processing unit;
A motor drive device comprising: an abnormality coping means for performing at least one of control of stopping output of the motor drive unit and detection of abnormality detection by detecting an abnormality of the abnormality detection unit. The motor drive unit, the detection processing unit, the abnormality detection unit, and the abnormality coping unit are integrally incorporated in the brushless motor to form a main circuit unit together with the brushless motor,
The speed of the brushless motor is transferred to the predetermined signal input pin of the main circuit unit by the control unit separate from the main circuit unit capturing the rotation detection pulse of the predetermined signal output pin of the main circuit unit by wire or wirelessly. Command output,
The motor driving apparatus according to claim 1, wherein the rotation detection pulse of the signal output pin forms the rotation detection pulse on the output side of the output circuit.   The motor drive unit has an inverter circuit and a PWM circuit for driving the inverter circuit, and the control unit forms a speed command for feedback control of the brushless motor based on the rotation output pulse and transmits the speed command to the PWM circuit. The motor drive device according to claim 1, wherein:   4. The motor drive device according to claim 3, wherein the output stop control of the motor drive unit of the abnormality coping means is an output stop control of the PWM circuit.

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