WO2004042912A1 - モータ駆動装置 - Google Patents
モータ駆動装置 Download PDFInfo
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- WO2004042912A1 WO2004042912A1 PCT/JP2003/013480 JP0313480W WO2004042912A1 WO 2004042912 A1 WO2004042912 A1 WO 2004042912A1 JP 0313480 W JP0313480 W JP 0313480W WO 2004042912 A1 WO2004042912 A1 WO 2004042912A1
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- WIPO (PCT)
- Prior art keywords
- signal
- rotor
- state
- drive device
- switching control
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/29—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
Definitions
- the present invention relates to a motor drive device that performs a sensorless drive (PWM: pulse width modulation).
- PWM pulse width modulation
- FIG. 14 shows a configuration of a conventional motor drive device.
- a rotor 1010 has a field portion made of a permanent magnet, and generates a rotational force by interaction with coils 1011, 1012, and 1013.
- the power supply device 1020 includes three upper power transistors and three lower power transistors, and supplies power to the coils 101 1, 1012, and 1013.
- the position detector 1030 compares the terminal voltages V1, V2, and V3 at one end of the coils 1011, 1012, and 1013 with the common voltage Vc, and outputs a detection pulse signal FG according to the comparison result.
- Command device 1040 outputs speed command signal EC for controlling speed of rotor 1010.
- the switching controller 1050 outputs a PWM signal Wp for performing the PWM operation of the upper power transistor of the power supply 1020.
- the energization controller 1060 controls the upper energization control signals Nl, N2, N3 and the lower energization control signal Ml to control the energization of the coils 101 1, 1012, 1013 according to the detection pulse signal FG and the PWM signal Wp. Outputs M2 and M3.
- the power supply 1020 supplies power to the coils 1011, 1012, and 1013, and performs PWM sensorless driving of the motor.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a motor drive device capable of performing a stable PWM sensorless start in consideration of the influence of induction noise peculiar to PWM operation in PW1V [sensorless drive]. Disclosure of the invention
- a motor drive device of the present invention is a motor drive device that drives a motor including a rotor and a multi-phase coil that generates a magnetic field to rotate the rotor.
- a plurality of transistors that operate as an open / close switch of a current supply path to the current supply, position detection means for detecting a rotational position of the rotor based on a terminal voltage of each coil, and a rotor based on a detection result by the position detection means.
- Switching control means for causing the transistor to perform a switching operation for switching between an on state and an off state in order to rotate the transistor at a predetermined speed, the switching control means further comprising: Controlling the transistor to forcibly turn off the transistor for a predetermined period; Ring control means characterized in that the detection of seeing the location in the selected time period which is forcibly turned off transistor.
- the position of the rotor is detected only during a period in which the switching control means forcibly turns off the transistor. During this period, erroneous position detection due to inductive noise specific to PWM operation can be prevented, and as a result, startup failure due to erroneous detection can be prevented. In other words, stable PWM sensorless startup is possible.
- the transistor is switched between on and off by high-frequency switching and the motor is driven by PWM, the induction noise generated by the current change due to the PWM operation is superimposed on the terminal voltage of the coil whose position is to be detected. Is done. If position detection is performed using the terminal voltage on which the induction noise is superimposed, erroneous detection is likely to occur. Therefore, the present invention has a configuration in which position detection is performed in the forced off section of the PWM operation.
- the rotor has a permanent magnet
- each of the coils is arranged in a row
- the motor driving device further includes a DC power source serving as a power supply source.
- a transistor group that operates as an open / close switch of a current supply path from one terminal side of the DC power supply means to one end of each coil; and current supply from the other terminal side of the DC power supply means to one end of each coil.
- a switching group that operates as an open / close switch of a path, wherein the switching control means controls the forced OFF state with respect to each transistor of at least one of the transistor groups. It may be a feature.
- the switching control means may perform the control on at least one of the transistor groups, it is not necessary to target both of the transistor groups, thereby simplifying the circuit. You can also.
- the position detecting means suppresses the detection of the position at a predetermined time from a point in time when the switching control means performs a control to the forcible off state from a time point when the switching state changes from an on state to an off state.
- the predetermined period related to the forcible switching to the off state by the switching control unit may be longer than the predetermined period.
- the motor driving device further includes a rotation speed determination unit configured to determine whether a rotation speed of the rotor is equal to or higher than a predetermined speed. If it is determined that there is, the position may be detected at least during a period in which the transistor is turned on.
- the switching control means suppresses the control to the forcible off state when it is determined that the rotation speed is equal to or higher than a predetermined speed.
- the switching control means controls the forcible off state from the on state to the off state.
- the detection of the position is suppressed for the first time from the change time point, and when the rotational speed is determined to be equal to or higher than the predetermined speed, the second time from the time point when the transistor changes from the off state to the on state is determined.
- the detection of the position may be suppressed, and the predetermined period relating to the control to forcibly turn off the switching control unit may be longer than the first time.
- the present invention may be characterized in that the rotation speed determination means makes the determination based on a result of position detection by the position detection means.
- the rotation speed determination means can perform the determination using the detection result of the position detection means without specially providing a mechanism for determining the speed. It can be simplified.
- the invention may be characterized in that the switching control means turns on a predetermined transistor at regular intervals and turns off the transistor for a specific time immediately before turning on the transistor.
- the present invention may be characterized in that the predetermined period in which the switching control means forcibly turns off the power supply is less than 1200 seconds.
- the position detecting means compares the terminal voltage of each coil with a midpoint voltage of all the coils or a midpoint voltage simulated from the terminal voltage of each coil, to thereby determine the position of the rotor. It may be characterized in that the position is detected.
- the period in which the switching control means performs the control for forcibly turning off is a period including a section in which the drive current of each of the coils is 0, and the position detection means includes: The position may be detected.
- FIG. 1 shows a configuration of the motor drive device according to the first embodiment.
- FIG. 2 shows a specific configuration of the position detector 30.
- FIG. 3 shows a specific configuration of the switching operation device 50.
- FIG. 4 shows the relationship between the signal waveforms of the switching controller 52.
- FIG. 5 shows a configuration of a motor drive device according to the second embodiment.
- FIG. 6 shows a specific configuration of the position detector 3OA.
- FIG. 7 shows a configuration of a motor drive device according to the third embodiment.
- FIG. 8 shows a specific configuration of the switching operation device 50.
- FIG. 9 shows the relationship between the signal waveforms of the switching controller 52 in the first position detection mode.
- FIG. 10 shows the relationship between the signal waveforms of the switching controller 52 in the second position detection mode.
- FIG. 11 shows a configuration of a motor drive device according to the fourth embodiment.
- FIG. 12 shows a specific configuration of the switching controller 52A.
- FIG. 13 shows the relationship between the respective signal waveforms of the switching controller 52A.
- FIG. 14 shows the configuration of a conventional motor drive device. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows a configuration of the motor drive device according to the first embodiment.
- a rotor 10 is provided with a field portion for generating a field magnetic flux of a plurality of poles by a magnetic flux generated by a permanent magnet, and three-phase coils 11, 12, and 13 are arranged in a stationary body. It is arranged so as to be electrically shifted by 120 degrees relative to the relative relationship with the rotor 10. One end of each coil is connected to the power supply 20, and the other is commonly connected.
- the three-phase coils 11, 12, and 13 generate a three-phase magnetic flux by the three-phase drive currents I1, 12, and I3, generate a driving force by interaction with the rotor 10, and are attached to the rotor 10 and the rotor 10.
- Disc 1 rotates.
- the DC power supply 5, which is the power supply source, has the negative terminal connected to the ground potential and supplies the required DC voltage Vm to the positive terminal.
- the current input terminals of the three upper power transistors 21, 22, and 23 are commonly connected to the positive terminal of the DC power supply 5 via the current detector 51, and the current output terminals of the upper power transistors 21, 22, and 23 are connected.
- the current outgoing terminals of the three lower power transistors 25, 26, and 27 are commonly connected to the negative terminal of the DC power supply 5, and the current inflow terminals of the lower power transistors 25, 26, and 27 are connected to the negative terminal, respectively.
- the power supply terminals of the three-phase coils 11, 12, and 13 are connected.
- upper power diodes 21 d, 22 d and 23 d are connected in anti-parallel to the upper power transistors 21, 22 and 23, respectively, and lower power diodes 25 d and 25 d are connected to the lower power transistors 25, 26 and 27, respectively. 26 d and 27 d are respectively connected in anti-parallel.
- the upper power transistors 21, 22, 23 and the lower power transistors 25, 26, 27 use N-channel field-effect power transistors, and are formed by being connected in anti-parallel to each N-channel field-effect power transistor. Parasitic diodes are used as upper power diodes 21d, 22d, 23d and lower power diodes 25d, 26d, 27d, respectively.
- the power supply 20 includes upper power transistors 21, 22, 23 and lower power transistors 25, 26, 27 and upper power diodes 21d, 22d, It consists of 23d and lower power diodes 25d, 26d, 27d.
- the upper power transistors 21, 22, and 23 are connected to the positive terminal of the DC power supply 5 and the power of the three-phase coils 11, 12, and 13 according to the upper energization control signals N1, N2, and N3 of the energization controller 60.
- the power supply path between the supply terminals is opened and closed to form a current path that supplies the positive side current of the drive currents II, 12, and I3 to the three-phase coils 11, 12, and 13.
- the upper-side energization control signals Nl, N2, N3 are digital PWM signals in each energization section by the PWM signal Wp of the switching controller 52.
- the upper power transistors 21, 22, and 23 perform high-frequency switching operation.
- the lower power transistors 25, 26, and 27 are connected to the negative terminal of the DC power supply 5 and the power supply terminals of the three-phase coils 11, 12, and 13 according to the lower energization control signals Ml, M2, and M3 of the energization controller 60.
- the power supply path between them is opened and closed to form a supply path for supplying the negative currents of the drive currents I 1, 12 and I 3 to the three-phase coils 11, 12 and 13.
- the details of the configuration and operation of the switching controller 52 will be described later.
- the position detector 30 detects the rotational positions of the disk 1 and the rotor 10, and outputs a detection pulse signal FG corresponding to the detection result.
- FIG. 2 shows a specific configuration of the position detector 30.
- the position detector 30 includes four input resistors 31, 32, 33, and 34, three voltage comparison circuits 35, 36, and 37, a noise removal circuit 38, and a detection circuit 39.
- the terminal voltages V 1, V 2, V 3 generated at one end of the three-phase coils 11, 12, 13 and the commonly connected midpoint voltage Vc are input to the voltage comparator 35, 35 via the input resistors 31, 32, 33, and 34, respectively. 36 and 37 are entered.
- the noise elimination circuit 38 performs noise elimination of switching noise accompanying the high-frequency switching operation included in the voltage comparison signals C1, C2, and C3 of the voltage comparison circuits 35, 36, and 37, and compares the voltage after the noise elimination. Outputs signals C 1 R, C2R, C 3 R. Note that the mask signal Wm of the switching controller 52 is used for noise removal. The mask signal Wm will be described later.
- the detection circuit 39 uses the noise removal voltage comparison signals C 1 R, C 2 R, and C 3 R of the noise removal circuit 38 and the detection window signals WIN 1 to 6 of the energization controller 60 to detect the disk 1 and the low Performs 10 position detection and outputs the detection pulse signal FG corresponding to the detection result.
- the detection pulse signal FG is input to the command device 40 and the conduction controller 60.
- the detection windows WIN 1 to WIN 6 will be described.
- the detection window signals WIN 1 to WIN 6 are the output signals of the energization controller 60, and the rising and falling zero crossings of the back electromotive voltage induced in the three-phase coils 11, 12, and 13 in the non-energized phase, respectively. It corresponds to the detection window.
- the detection window signal WIN 1 is a window for detecting the rising zero-cross of the back electromotive voltage of the coil 11
- the detection window signal WIN 2 is a window for detecting the falling zero cross of the back electromotive voltage of the coil 13.
- the detection window signals WIN 1 to WIN 6 are signals whose phases are shifted by 60 degrees in electrical angle.
- the command unit 40 includes a speed control circuit for controlling the rotation speed of the disk 1 and the rotor 10 to a predetermined speed, and the rotation of the disk 1 and the rotor 10 by the detection pulse signal FG of the position detector 30. Detects the speed and outputs a speed command signal Ac corresponding to the difference from the target rotation speed.
- the switching operation device 50 includes a current detector 51, a switching controller 52, and a forced off signal generator 53.
- FIG. 3 shows a specific configuration of the switching operation device 50.
- the current detector 51 includes a current detection resistor 110, and a three-phase coil 11 1, 1 2 from the positive terminal of the DC power supply 5 via upper power transistors 21, 22, 23. , 13 output the current detection signal Ad proportional to the supply current or the supply current.
- the forced off signal generator 53 outputs a forced off signal Wo that becomes L level at a constant period To and inputs the signal to the switching controller 52.
- the switching controller 52 compares the current detection signal Ad of the current detector 51 with the speed command signal Ac of the command device 40, and outputs a PWM reset signal Pr corresponding to the comparison result. In response, it outputs a PWM signal WP and a mask signal Wm.
- the PWM signal Wp is input to the conduction controller 60, and the mask signal Wm is input to the noise removal circuit 38 of the position detector 30.
- the PWM signal Wp is a signal for causing the upper power transistors 21, 22, 23 of the power supply device 20 to perform a high-frequency switching operation (PWM operation).
- the motor drive device of the first embodiment is the same even when the current detector 51 is configured between the negative terminal of the DC power supply 5 and the lower power transistors 25, 26, and 27. .
- Switching controller 5 2 is comparison circuit 1 1 1 and reference trigger generation circuit 1 1 2 and PW It comprises an M signal creation circuit 113, an AND gate 115, and a mask signal creation circuit 116.
- the comparison circuit 111 compares the current detection signal Ad of the current detector 51 with the speed command signal Ac of the command device 40, and outputs a PWM reset signal Pr corresponding to the comparison result. Specifically, when the current detection signal Ad becomes larger than the speed command signal Ac, the PWM reset signal changes from L level to H level.
- the reference trigger generation circuit 112 is a circuit that outputs a reference trigger signal Ps at a constant cycle Tp. Specifically, lZTp is a value between 20 kHz and 500 kHz.
- the PWM signal generation circuit 113 outputs the basic PWM signal Wb based on the PWM reset signal Pr of the comparison circuit 111 and the reference trigger signal Ps of the reference trigger generation circuit 112.
- Figure 4 shows the relationship between the reference trigger signal Ps, the PWM reset signal Pr, and the basic PWM signal Wb.
- the state of the basic PWM signal Wb changes to the H level at the rising edge of the reference trigger signal Ps having the constant period Tp, and changes to the L level at the rising edge of the PWM reset signal Pr.
- the basic PWM signal Wb is a PWM signal corresponding to the comparison result between the current detection signal Ad and the speed command signal Ac.
- the basic PWM signal Wb is a PWM signal that changes the duty in response to the speed command signal Ac of the command device 40.
- the actual rotation of the disk 1 and the rotor 10 with respect to the target rotation speed is When the speed is low, the speed command signal Ac of the commander 40 increases, and the on-duty of the basic PWM signal Wb also increases. Conversely, when the actual rotation speeds of the disk 1 and the rotor 10 are faster than the target rotation speed, the speed command signal Ac of the command device 40 becomes smaller, and the on-duty of the basic PWM signal Wb also becomes smaller.
- the speed command signal Ac of the command unit 40 has a value corresponding to the target rotation speed, and the on-duty of the basic PWM signal Wb is almost equal. The value corresponds to the target rotation speed.
- the rotational speeds of the disc 1 and the B rotor 10 are detected from the detection pulse signal FG of the position detector 30, and the speed command signal Ac corresponding to the difference from the target rotational speed is output.
- the speed of the disk 1 and the rotor 10 is controlled by changing the on-duty of the basic PWM signal Wb.
- the forcible off signal generator 53 outputs a forcible off signal Wo for forcibly turning off the upper power transistors 21, 22, and 23 of the power supply 20 every fixed period T0, and the AND gate 115 of the switching controller 52. Input to one of the input terminals. other The other input terminal receives the basic PWM signal Wb of the PWM signal generation circuit 113, and the AND gate 115 performs AND synthesis and outputs the PWM signal Wp.
- FIG. 4 shows the relationship between the signal waveforms of the switching controller 52. By this PWM signal Wp, the upper power transistors 21, 22, and 23 of the power supply 20 perform a high-frequency switching operation.
- the forcible off operation is forcibly performed at regular intervals To by the forcible off signal Wo.
- the current is always cut off at regular intervals To by the forced off operation, noise becomes a problem if the repetition frequency 1 / T 0 of the forced off signal W 0 is within the audible frequency range. Therefore, it is desirable to set the repetition frequency 1 / To of the forced off signal Wo outside the audible frequency range (20 kHz or more). That is, To is preferably 1/20000 second or less.
- the timing of the forced off operation by the forced off signal Wo is not limited to the fixed period Tp as in the motor drive device of the first embodiment, and the forced off operation is performed at an arbitrary period or at any time in the evening. You may go.
- the PWM signal Wp is also input to the mask signal generation circuit 116.
- the mask signal generating circuit 116 outputs a mask signal Wm for removing the switching noise accompanying the high frequency switching operation superimposed on the voltage comparison signals C1, C2 and C3 in the noise removal circuit 38 of the position detector 30.
- the H level section of the mask signal Wm is a section for masking high-frequency switching noise
- the L level section of the mask signal Wm is a section where position detection is possible.
- the mask signal Wm is a signal that masks all areas other than the forced off section and further masks the first predetermined time Ta after the forced off.
- the section in which the rotational positions of the disk 1 and the rotor 10 can be detected is only the section X in FIG. 4 excluding the first predetermined time Ta from the forced off section A.
- position detection is performed only in the forced off section.
- the forced off section A must always be set to a time (A> Ta) longer than the first predetermined time Ta after the forced off.
- the energization controller 60 outputs the upper energization control signals Nl, N2, N3 and the lower energization control signals Ml, M2, M3 in response to the detection pulse signal FG of the position detector 30.
- the power supply to the three-phase coils 11, 12, 13 of the upper power transistors 21, 22, 23 and the lower power transistors 25, 26, 27 is controlled.
- the upper energization control signals N1, N2, and N3 include the PWM signal Wp of the switching controller 52. Are logically synthesized.
- the upper power transistors 21, 22, and 23 perform a high-frequency switching operation by the upper energization control signals N l, N 2, and N 3 (PWM signal Wp), and the lower energization control signals M l, M 2, and M 3 Due to 3, the lower power transistors 25, 26, and 27 perform full ON operation. More specifically, when energization control is performed from the coil 11 to the coil 12, the upper power transistor 21 performs a high-frequency switching operation by the upper energization control signal N 1, and the lower power transistor 2 6 Perform full-on operation by the lower energization control signal M2.
- the upper power transistor 21 When the upper power transistor 21 is turned on by the PWM signal Wp, the upper power transistor 21 supplies a positive current to the coil 11 from the positive terminal of the DC power supply 5, and the lower power transistor 26 A negative current is supplied to the coil 12 from the negative terminal of the DC power supply 5.
- the PWM signal W p is turned off, the positive side current flowing through the coil 11 tries to continue to flow due to the inductance action of the coil. Supply current.
- the PWM operation is performed in this way.
- the energization controller 60 also outputs detection window signals WIN 1 to WIN 6 in response to the detection pulse signal FG of the position detector 30.
- the motor drive device of the first embodiment performs the PWM sensorless drive with the above configuration.
- the sensorless drive of the motor needs to detect the rotational position of the disk 1 and the mouth 10 so that a non-energized phase section, that is, a section where the in-phase upper and lower power transistors of the power supply 20 are off, is provided. In that section, zero-cross detection of the back electromotive voltage induced in the coil is performed, and sensorless driving of the motor is performed.
- the rotor position is uncertain and the rotation speed is low in the initial stage of startup, the back electromotive force induced in the three-phase coils 11, 12, and 13 is also small, and position detection is difficult. Therefore, there was a problem that sensorless driving could cause startup failure.
- Inductive noise is current due to PWM operation This is the voltage generated with the change.
- the upper power transistor 21 is operated in PWM, and the lower power transistor 27 is operated in full ON. In this state, the current flows from the coil 11 to the coil 13, and the detection phase is the coil 12.
- the commonly connected midpoint voltage Vc and the terminal voltage V2 of the detection phase should be equal, and the difference voltage should be zero.
- an induced noise which is a phenomenon peculiar to the PWM operation, is superimposed on the terminal voltage V2 of the detection phase with respect to the midpoint voltage Vc.
- the inductive noise is a voltage generated by the current change due to the PWM operation, but the polarity is reversed when the current change is positive or negative. Also, the magnitude of the induced noise changes with the magnitude of the current change.
- a method of starting there is a method in which the disk 1 and the rotor 10 are attracted to a specific phase before starting, and the positions are fixed before starting. When starting after fixing the initial position in this way, stable sensorless startup is possible, but the time required for fixing the initial position becomes longer. For this reason, a method is often adopted in which forced synchronous drive is performed at the beginning of startup, and then startup is performed by switching to sensorless drive.
- the PWM signal W p Has a large on-duty, almost 100%.
- the position detection is performed almost during the ON period of the PWM operation.
- the terminal voltage of the detection phase is superimposed with the induced noise due to the positive current change due to the PWM operation, and the influence is exerted by the influence. Incorrect detection of the position caused a start failure.
- the motor drive device of the first embodiment is configured to perform position detection by providing an OFF section in the PWM operation.
- the switching operation device 50 is provided with a forced off signal generator 53, and the forced off signal generator 53 is provided with the upper power transistors 21 1, 22 of the power supply device 20 at regular intervals To.
- a forced off signal Wo for forcibly turning off 23 is output, and the position detector 30 performs position detection only in the forced off section.
- the position detection operation is performed only in the forced off section, the position detection is performed in response to a negative current change due to the PWM operation. Therefore, the induced noise at this time has the opposite polarity to the induced noise caused by the positive current change. With this configuration, stable PWM sensorless startup is possible.
- the forced off section A may be any time as long as the time is longer than the first predetermined time Ta after the forced off (A> Ta). Specifically, the value is set to 33 or more and 203 or less.
- induction noise for example, if a configuration is adopted in which a long forced off section A where the drive current becomes 0 and position detection is performed in a section where the drive current is 0 is performed, In the interval where the current is 0, there is no current change due to PWM operation, so no induced noise occurs. That is, the effect of the induced noise can be ignored.
- FIG. 5 shows a configuration of a motor drive device according to the second embodiment.
- the midpoint voltage Vc commonly connected to the terminal voltages VI, V2, and V3 generated at one end of the three-phase coils 11, 12, and 13 is input to the position detector 30, and the position detector 30
- the terminal voltages VI, V2, and V3 of the three-phase coils 11, 12, and 13 are detected while the rotational positions of the disk 1 and the rotor 10 are detected in the second embodiment.
- the only difference is that only the rotational position is detected by the position detector 3OA without using the midpoint voltage Vc.
- Figure 6 shows the specific configuration of the position detector 3OA.
- Terminal voltages V1, V2, V3 generated at one end of the three-phase coils 11, 12, 13 are input to one of the input terminals of the voltage comparison circuits 35, 36, 37 via the input resistors 31, 32, 33. .
- the other input terminal of the voltage comparison circuit 35, 36, 37 is connected to the terminal voltage VI, V2, V3 generated at one end of the three-phase coil 11, 12, 13, and the midpoint voltage Vc simulated from i is entered.
- the pseudo midpoint voltage Vci is created by connecting the resistors 34A, 34B, and 34C to the terminal voltages VI, V2, and V3, respectively, and connecting one end of them.
- the voltage comparison circuits 35, 36, 37 directly compare the terminal voltages V1, V2, V3 generated at one end of the three-phase coils 11, 12, 13 with the pseudo midpoint voltage Vci.
- the circuit configuration after the voltage comparison circuits 35, 36, 37 is the same as that of the position detector 30 of the first embodiment, and thus the terminal voltages V1, V2, The rotation position is detected using only V3.
- the input of the position detector 3OA can be three terminal voltages VI, V2, and V3 generated at one end of the three-phase coils 11, 12, and 13.
- One input can be reduced compared to the device.
- the midpoint of the motor One wiring from the voltage to the position detector 30 A and one input terminal can be reduced.
- FIG. 7 shows a configuration of a motor drive device according to the third embodiment.
- the configuration shown in the figure is different from the configuration shown in FIG. 1 in that a rotation speed determiner 70 is added.
- the detection pulse signal FG of the position detector 30 is input to the rotation speed determiner 70, and the rotation speed determiner 70 determines the rotation speed of the disk 1 and the rotor 10 using the position detection pulse signal FG.
- a rotation speed determination signal NS which becomes H level is output.
- the determination of the rotation speed of the disk 1 and the rotor 10 is not limited to the configuration in which the determination is made using the position detection pulse signal FG, and the rotation speed may be determined in another configuration.
- FIG. 8 shows a specific configuration of the switching operation device 50.
- the basic configuration is the same as that of the motor drive device of the first embodiment.
- the rotation speed determination signal NS is input to the mask signal generation circuit 1 16 of the forced off signal generator 53 and the switching controller 52.
- the rotation speed determination signal NS is at the L level, that is, the position detection during the period from the start of the rotation of the disk 1 and the opening of the mouth 10 until the rotation speed reaches the predetermined rotation speed is defined as the first position detection mode.
- Position detection when the speed determination signal is at the H level that is, when the rotation speeds of the disk 1 and the rotor 10 are equal to or higher than a predetermined rotation speed is defined as a second position detection mode.
- FIG. 9 shows the relationship between the signal waveforms of the switching controller 52 in the first position detection mode.
- the forced off signal generator 53 outputs a forced off signal Wo. Therefore, the PWM signal Wp is a logical product output of the basic PWM signal Wb and the forced off signal Wo.
- the mask signal generator 1 16 masks all areas other than the forced off section and outputs a mask signal Wm for masking the first predetermined time Ta after the forced off (similar to the first embodiment). That is, in the first position detection mode, the position can be detected only in the section X obtained by removing the first predetermined time Ta from the forced off section A. In the forced off section A, it is sufficient that A> Ta with respect to the first predetermined time Ta.
- FIG. 10 shows each signal of the switching controller 52 in the second position detection mode. 2 shows the relationship between signal waveforms.
- the forced off signal generator 53 outputs the H level. Therefore, since the PWM signal Wp is the logical product output of the basic PWM signal Wb and the forced off signal Wo (H level), the PWM signal Wp becomes the basic PWM signal Wb. With this PWM signal Wp, what are the upper power transistors 21, 22, 23 of power supply unit 20? ⁇ ⁇ 4 operation is performed.
- the mask signal generator 1 16 responds to the PWM signal Wp in the interval X except for the first predetermined time Ta immediately after the transition to the off interval in the off interval of the PWM operation, and during the on interval of the PWM operation. The position can be detected in the section Y except for the second predetermined time Tb immediately after the transition to the ON section in.
- the output of the forced off signal Wo is set to the H level when the rotation speed is equal to or higher than the predetermined rotation speed, and the forced off operation is inhibited to suppress the disturbance of the driving current.
- the second position detection mode that outputs a mask signal Wm capable of detecting the position on the ON side and the OFF side of the disk 1 and the second position detection mode in response to the rotation speed of the disk 1 and the rotor 10 is used. The position detection mode is switched to perform the position detection.
- the position detection is performed by switching between the first position detection mode and the second position detection mode by the rotation speed determination signal NS which is the output signal of the rotation speed determination unit 70. Since the position is detected only during the forced off section from the start of operation until the specified rotation speed is reached, stable PWM sensorless startup is possible, and the forced off operation is prohibited at the specified rotation speed or higher, and PWM operation is performed. Since the position is detected during the ON period or the OFF period, stable operation is possible even at regular times.
- FIG. 11 shows a configuration of a motor drive device according to the fourth embodiment.
- the configuration shown in the figure is different from the configuration shown in FIG. 1 in the switching controller 52A of the switching operator 50.
- FIG. 12 shows a specific configuration of the switching controller 52A. The difference from the switching controller 52 in FIG. 1 is that an off signal generation circuit 1 17 for a predetermined time is added, This is the point where the logical gate 1 1 5 has 3 inputs.
- Fig. 13 shows the relationship between the signal waveforms of the switching controller 52A.
- the predetermined time OFF signal generation circuit 1 17 is synchronized with the reference trigger signal Ps of the reference trigger generation circuit 1 12 and is turned off by the predetermined time Tf immediately before the ON timing of the reference trigger signal Ps of a fixed period T. Outputs the time-off signal W f.
- the AND gate 1 15 is the basic PWM signal W b of the PWM signal generation circuit 113 and the forced off signal W o of the forced off signal generator 53 and the predetermined time of the off signal generation circuit 1 17 for the predetermined time. Performs AND synthesis of the OFF signal W f and outputs it as the PWM signal Wp.
- Other configurations are the same as those of the motor driving device of the first embodiment.
- the drive current fluctuates due to the rotation fluctuation of the load to be driven (for example, a disk), so that the PWM operation of the next cycle is started before the PWM operation of one cycle is completed. It has a tendency to cause erroneous operation such as switching phenomena.
- the PWM operation is always performed at regular intervals T except during the forced off period, so that the switching loss phenomenon can be prevented and the disturbance of the driving current can be reduced. In other words, stable operation is possible.
- It can be used as a motor drive mechanism for an optical disk device, a magnetic disk device, or the like.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/530,442 US7126301B2 (en) | 2002-10-22 | 2003-10-22 | Motor driver |
JP2004549574A JP4486888B2 (ja) | 2002-10-22 | 2003-10-22 | モータ駆動装置 |
Applications Claiming Priority (2)
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JP2002-306922 | 2002-10-22 | ||
JP2002306922 | 2002-10-22 |
Publications (2)
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WO2004042912A1 true WO2004042912A1 (ja) | 2004-05-21 |
WO2004042912B1 WO2004042912B1 (ja) | 2004-07-08 |
Family
ID=32310333
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2003/013480 WO2004042912A1 (ja) | 2002-10-22 | 2003-10-22 | モータ駆動装置 |
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US (1) | US7126301B2 (ja) |
JP (1) | JP4486888B2 (ja) |
KR (1) | KR20050055017A (ja) |
CN (1) | CN100420146C (ja) |
WO (1) | WO2004042912A1 (ja) |
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US7859205B2 (en) | 2007-03-23 | 2010-12-28 | Panasonic Corporation | Motor drive apparatus and motor drive method |
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JP2013013276A (ja) * | 2011-06-30 | 2013-01-17 | Mitsubishi Electric Corp | 電動機制御装置、及びその電動機制御装置を用いた電動過給装置 |
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- 2003-10-22 CN CNB2003801018089A patent/CN100420146C/zh not_active Expired - Fee Related
- 2003-10-22 KR KR1020057006469A patent/KR20050055017A/ko not_active Application Discontinuation
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JP2007116827A (ja) * | 2005-10-20 | 2007-05-10 | Rohm Co Ltd | モータ駆動回路およびそれを用いたディスク装置 |
WO2007122784A1 (ja) * | 2006-03-29 | 2007-11-01 | Rohm Co., Ltd. | モータ駆動回路および方法ならびにそれを用いたディスク装置 |
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CN101411054B (zh) * | 2006-03-29 | 2012-06-27 | 罗姆股份有限公司 | 电机驱动电路和方法、以及使用了它的盘装置 |
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JP2013013276A (ja) * | 2011-06-30 | 2013-01-17 | Mitsubishi Electric Corp | 電動機制御装置、及びその電動機制御装置を用いた電動過給装置 |
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Also Published As
Publication number | Publication date |
---|---|
JPWO2004042912A1 (ja) | 2006-03-09 |
WO2004042912B1 (ja) | 2004-07-08 |
CN100420146C (zh) | 2008-09-17 |
US20060097674A1 (en) | 2006-05-11 |
US7126301B2 (en) | 2006-10-24 |
KR20050055017A (ko) | 2005-06-10 |
JP4486888B2 (ja) | 2010-06-23 |
CN1706095A (zh) | 2005-12-07 |
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