US20120256573A1 - Motor driving device, and control method of motor driving device - Google Patents
Motor driving device, and control method of motor driving device Download PDFInfo
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- US20120256573A1 US20120256573A1 US13/528,552 US201213528552A US2012256573A1 US 20120256573 A1 US20120256573 A1 US 20120256573A1 US 201213528552 A US201213528552 A US 201213528552A US 2012256573 A1 US2012256573 A1 US 2012256573A1
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- motor
- control
- inverter circuit
- power supply
- supply terminal
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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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/08—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor
- H02P3/12—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a dc motor by short-circuit or resistive braking
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
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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
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
Definitions
- the present invention relates to a motor driving device and to a control method for the motor driving device, and specifically to a motor driving device for a brushless direct-current (hereinafter, referred to as “DC”) motor and to a control method for the motor driving device.
- DC brushless direct-current
- MOS FET Metal-Oxide-Semiconductor Field-Effect Transistor
- FIG. 4 illustrates an inverter circuit 1 in a commonly-used brushless DC motor.
- the inverter circuit 1 includes transistors Q 1 to Q 6 .
- the transistors Q 1 and Q 2 , Q 3 and Q 4 , and Q 5 and Q 6 are respectively connected in series between a DC power supply voltage VDD and a ground voltage GND.
- Control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ are input to the transistors Q 1 to Q 6 , respectively.
- FIG. 5 illustrates an example of operation waveforms of the voltages of these control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ .
- the transistors Q 1 to Q 6 perform switching operation in which they are repeatedly turned on or off. For example, at times t 0 to t 2 , the control signals U+ and V ⁇ are coincidentally at a high level, and thus, the transistors Q 1 and Q 4 are coincidentally in an on-state. Consequently, currents flow in the coils in the U-phase and the V-phase of a brushless DC motor 2 .
- control signals V+ and W ⁇ are coincidentally at a high level, and thus, the transistors Q 3 and Q 6 are coincidentally in an on-state. Consequently, currents flow in the coils in the V-phase and the W-phase of the brushless DC motor 2 . Subsequently, the transistors are switched on/off based on the control signals in such a manner as described above, enabling the inverter circuit 1 to generate drive current for the brushless DC motor 2 .
- the brushless DC motor 2 is a three-phase motor. Accordingly, the on/off state of the transistors Q 1 to Q 6 is adjusted so that currents flowing in the coils in the U-phase, the V-phase and the W-phase of the brushless DC motor 2 flow in phases shifted from one another by 120°.
- the control signals U ⁇ , V ⁇ and W ⁇ are signals that are inversions of the control signals U+, W+ and V+, respectively.
- PWM pulse width modulation
- This PWM control is currently most commonly used as a DC motor control method.
- FIGS. 6A and 6B A brief description of PWM control will be provided with reference to FIGS. 6A and 6B .
- the graph in FIG. 6B illustrates one of the control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ being subjected to pulse-width modulation, for example, the control signal U+.
- Each of the other control signals is a signal having a wavelength similar to that of the example or a signal that is an inversion thereof, though its phase is shifted from that of the example.
- PWM control in the example uses a triangle wave as a carrier. Also, in order to control, e.g., the rotation speed of the motor to have a desired value, a command voltage signal, which is illustrated in FIG. 6A , is used. This command voltage signal and the triangle wave are compared with each other to determine the pulse widths of the control signal U+, as illustrated in FIG. 6B .
- the widths of the pulses of the control signal U+ are large. Conversely, where the amplitude voltage is low, the pulse widths of the control signal U+ are small. Where the pulse widths are large, the on-state of the transistor lasts for a relatively long time, resulting in an increase in the currents flowing in the coils of the motor, and thereby raising the rotation speed of the motor. Conversely, where the pulse widths are small, the on-state of the transistor lasts only for a short time, thereby lowering the rotation speed of the motor. As described above, in PWM control, a command voltage signal is subjected to pulse width modulation, and the rotation speed of the motor is controlled by, e.g., the control signal U+ subjected to pulse width modulation.
- inverter control for a brushless DC motor as described above, where it becomes unable to perform motor drive control due to, e.g., sudden deceleration of the motor or a system failure, the motor enters a regeneration (power generation) state due to the load-side inertia, generating a large back electromotive force (emf).
- a regeneration (power generation) state due to the load-side inertia, generating a large back electromotive force (emf).
- emf back electromotive force
- a mechanism for back electromotive force removal is needed.
- JP-A-HEI-6-343291 discloses a back electromotive force removal device 3 that upon the voltage on the input side of an inverter being abnormally increased by a back electromotive force from a motor, a current is made to flow in a regeneration load resistor to remove the back electromotive force.
- FIG. 7 illustrates a configuration of the back electromotive force removal device 3 .
- the back electromotive force removal device 3 includes a power supply unit 4 , a back electromotive force detection unit 5 , a MOS FET base driver 6 , a back electromotive force removal unit 7 , a first display unit 8 and a second display unit 9 .
- the present inventor has recognized the following point. Namely, in the back electromotive force removal device 3 according to JP-A-HEI-6-343291, upon an abnormal voltage, which has been increased by a back electromotive force, being detected between power supply input terminals DC+ and DC ⁇ , a MOS FET 71 in the back electromotive force removal unit 7 is controlled to be turned on or off. Consequently, a current I 73 is made to flow in a regeneration load resistor R 72 connected between the power supply input terminals DC+ and DC ⁇ and consumed as thermal energy, thereby removing the back electromotive force. However, in this method, a plethora of current I 73 flows instantaneously in the regeneration Load resistor R 72 .
- the back electromotive force removal unit 7 is required to have a large generation load resistor 72 and MOS FET 71 , which can tolerate the plethora of current, thereby increasing the circuit size.
- a control circuit dedicated to control the on/off state of the MOS FET 71 is required, thereby also increasing the circuit size.
- the present invention seeks to solve one or more of the above problems, or to improve upon those problems at least in part.
- a motor driving device includes a first power supply terminal, a second power supply terminal, a drive unit that is coupled to the first power supply terminal, the second power supply terminal, and a motor winding, a control unit that controls the drive unit, and a resistive element that is coupled between the drive unit and the first power supply terminal.
- the control unit makes the motor winding and the resistive element form a loop circuit when a voltage between the first power supply terminal and the second power supply terminal exceeds a predetermined value.
- a control method for a motor driving device which includes a drive unit coupled to a first power supply terminal, a second power supply terminal, and a motor winding, and a resistive element coupled between the drive unit and the first power supply terminal.
- the control method includes making the motor winding and the resistive element form a loop circuit when a voltage between the first power supply terminal and the second power supply terminal exceeds a predetermined value.
- a data processing apparatus controls an inverter circuit for a motor.
- the data processing apparatus includes a control unit that monitors a potential of a power supply terminal to supply power to the inverter circuit, and obtains an information indicative of an amount of a driving current flowing in a motor winding of the motor in response to an amount of a current flowing in a resistive element included in the inverter circuit, to control a driving of the motor.
- the control unit makes the motor winding and the resistive element form a loop circuit when the potential of the power supply terminal exceeds a predetermined value.
- the motor winding and the resistive element form a closed loop configuration. Consequently, the back electromotive force can be absorbed by the resistive element as thermal energy. Further, the present invention enables absorption of a back electromotive force without increasing a circuit size.
- FIG. 1 illustrates an example of a configuration driving device an example of an operation timing chart for a motor driving device 100 according to the first exemplary embodiment
- FIG. 2B illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment
- FIG. 2C illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment
- FIG. 3A illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment
- FIG. 3B illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment
- FIG. 3C illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment
- FIG. 4 illustrates an example of a configuration of a motor driving device according to a related art
- FIG. 5 illustrates, an example of an operation timing chart for an inverter unit 1 according to a related art
- FIG. 6A illustrates an example of a timing chart for describing PWM control
- FIG. 6B illustrates an example of a timing char or describing PWM control
- FIG. 7 illustrates a configuration of a back electromotive force removal device of JP-A-HEI-6-343291
- FIG. 8 illustrates a variation of a configuration of a motor driving device according to a first exemplary embodiment
- FIG. 9 is a diagram showing an example of installing in a product.
- the first exemplary embodiment is one in which the present invention is applied to a motor driving device.
- FIG. 1 illustrates an example of the configuration of a motor driving device 100 according to the first exemplary embodiment.
- the motor driving device 100 includes a converter unit 10 , an inverter unit 20 , a brushless DC motor 30 and a control unit 40 .
- the converter unit 10 rectifies a voltage from a commonly-used commercial AC power supply 11 and converts the voltage into a DC voltage.
- the converter unit 10 includes input terminals T 11 and T 12 , output terminals T 13 and T 14 , rectifier diodes D 11 to D 14 , and a smoothing capacitor C 11 . It also includes input terminals T 11 and T 12 , and output terminals T 13 and T 14 .
- the anode of the rectifier diode D 11 is connected to the input terminal T 11
- the cathode of the rectifier diode D 11 is connected to the output terminal T 13 .
- the anode of the rectifier diode D 12 is connected to the input terminal T 12 and the cathode of the rectifier diode D 12 is connected to the output terminal T 13 .
- the anode of the rectifier diode D 13 is connected to the output terminal T 14 , and the cathode of the rectifier diode D 13 is connected to the input terminal T 11 .
- the anode of the rectifier diode D 14 is connected to the output terminal T 14 , and the cathode of the rectifier diode D 14 is connected to the input terminal T 12 .
- One terminal of the smoothing capacitor C 11 is connected to the output terminal T 13 , and the other terminal of the smoothing capacitor C 11 is connected to the output terminal T 14 .
- a ground voltage terminal GND is connected to the output terminal T 14 .
- the inverter unit 20 includes NPN transistors Q 1 to Q 6 , clamp diodes D 21 to D 26 , and resistive elements R 21 to R 23 . It also includes power supply input terminals T 21 and T 22 , and output terminals T 23 to T 25 .
- the NPN transistors Q 1 to Q 6 are switching elements (i.e., a drive unit) for controlling motor drive currents flowing in the U-phase, the V-phase and the W-phase of the brushless DC motor 30 , which will be described later.
- the collector of the NPN transistor Q 1 is connected to the input terminal T 21 , and the emitter of the NPN transistor Q 1 is connected to a node A 1 .
- the collector of the NPN transistor Q 2 is connected to the node A 1 , and the emitter of the NPN transistor Q 2 is connected to a node A 2 .
- the collector of the NPN transistor Q 3 is connected to the input terminal T 21 , and the emitter of the NPN transistor Q 3 is connected to a node B 1 .
- the collector of the NPN transistor Q 4 is connected to the node B 1 , and the emitter of the NPN transistor Q 4 is connected to a node B 2 .
- the collector of the NPN transistor Q 5 is connected to the input terminal T 21 , and the emitter of the NPN transistor Q 5 is connected to a node C 1 .
- the collector of the NPN transistor Q 6 is connected to the node C 1 , and the emitter of the NPN transistor Q 6 is connected to a node C 2 .
- Control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ from the control unit 40 are input to the bases of the NPN transistors Q 1 to Q 6 , respectively.
- the nodes A 1 to C 1 are connected to the output terminals T 23 to T 25 , respectively.
- the clamp diodes D 21 to D 26 are connected between the collectors and the emitters of the NPN transistors Q 1 to Q 6 in non-parallel fashion to the NPN transistors Q 1 to Q 6 , respectively,
- the resistive elements R 21 to R 23 are resistors for detecting motor drive currents flowing in the U-phase, the V-phase and the W-phase of the brushless DC motor 30 . By measuring the amounts or phases of currents flowing in these resistive elements R 21 to R 23 , which phase a current flows in the brushless DC motor 30 can be detected. Also, by measuring the phase of this current, information such as the rotational position of the rotor in the brushless DC motor 30 can be obtained. It is desirable that these resistive elements R 21 to R 23 be formed by shunt resistors because they are used for current measurement. However, the resistive elements, R 21 to R 23 are not limited only to shunt resistors in terms of the resistor type.
- the brushless DC motor 30 includes, e.g., a permanent magnet synchronous motor.
- the brushless DC motor 30 includes coils for three phases, i.e., the U-phase, the V-phase and the W-phase as stators. Upon currents from the inverter unit 20 flowing in these three-phase coils, a rotor including a permanent magnet rotates.
- the coils in the U-phase, the V-phase and the W-phase of the brushless DC motor 30 are connected to the output terminals T 23 , T 24 and T 25 of the inverter unit 20 , respectively.
- the control unit 40 generates the control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ and outputs them to the inverter unit 20 . Also, it monitors a voltage Vin between the input terminals T 21 and T 22 of the inverter unit 20 . Also, it monitors the voltages of the nodes A 2 , B 2 and C 2 , and measures currents flowing in the resistive elements R 21 to R 23 . This enables detection of a failure, etc., occurring in the brushless DC motor 30 when an over-current flows in any of the resistive elements R 21 to R 23 . Furthermore, by measuring the phases of the currents flowing in the resistive elements R 21 to R 23 , for example, the position of the rotor in the brushless DC motor 30 can be detected.
- the control unit 40 includes a triangle wave generating circuit 41 .
- the triangle wave generating circuit 41 generates a triangle wave as a carrier for PWM control.
- the triangle wave generating circuit 41 may be provided outside the control unit 40 , and supply a triangle wave that the circuit 41 has generated to the control unit 40 .
- control unit 40 In a normal operation state, the control unit 40 outputs the control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ subjected to pulse width modulation, which are similar to that described with reference to the timing chart in FIG. 6B .
- the switching-on/off of the NPN transistors Q 1 to Q 6 in the inverter unit 20 is controlled by these control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ .
- the currents flowing in the NPN transistors Q 1 to Q 6 are output to the output terminals T 23 to T 25 as drive currents for the brushless DC motor 30 .
- the control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ are subjected to pulse width modulation using a triangle wave generated by the triangle wave generating circuit 41 and a command voltage signal.
- the command voltage signal is a control signal for controlling the brushless DC motor 30 to have a desired rotation speed. Since the relationship between this triangle wave, the command voltage signal and the pulse widths of the generated control signal U+, etc., are similar to that described with reference to FIGS. 6A and 6B , a description thereof will be omitted.
- control unit 40 When the voltage Vin between the input terminals T 21 and T 22 of the inverter unit 20 becomes an abnormal voltage equal to or exceeding an abnormality detection voltage Ve, the control unit 40 performs control so as to forcibly make the NPN transistors Q 1 , Q 3 and Q 5 enter an off-state and make the NPN transistors Q 2 , Q 4 and Q 6 enter an on-state by the control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ .
- FIGS. 2A , 2 B and 2 C illustrate a timing of an operation of the motor driving device 100 .
- FIG. 2A indicates the voltage between the input terminals T 21 and T 22 of the inverter unit 20 .
- FIG. 2B illustrates the pulse waveform of the control signal U+.
- FIG. 2C illustrates the pulse waveform of the control signal U ⁇ . In this example, description will be made only on the control signals U+ and U ⁇ .
- the control signals U+ and U ⁇ output by the control unit 40 to the inverter unit 20 each have a pulse waveform in a normal operation state.
- the motor driving device 100 becomes unable to perform drive control for the motor due to, e.g., sudden deceleration of the brushless DC motor 30 or a system failure.
- the motor enters a regeneration state (power generation state) due to, e.g., the load inertia.
- a back electromotive force from the motor raises the voltage Vin on the input side, that is, between the input terminals T 21 and T 22 , of the inverter unit 20 .
- the control unit 40 fixes the control signals U+, V+ and W+ at a low level and the control signals U ⁇ , V ⁇ and W ⁇ at a high level. Consequently, the NPN transistors Q 1 , Q 3 and Q 5 are forcibly brought to an off-state, and the NPN transistors Q 2 , Q 4 and Q 6 are forcibly brought to an on-state.
- the control unit 40 may output the control signals U+, U ⁇ , V+, V ⁇ , W+ and W ⁇ in a normal operation state again to the inverter unit 20 . Also, where the control unit 40 determines that the drive control for the motor cannot be performed due to, e.g., a system failure, it is possible to continue fixing the control signals U+, V+ and W+ at a low level and fixing the control signals U ⁇ , V ⁇ and W ⁇ at a high level.
- the converter unit 10 's power supply to the inverter unit 20 may be interrupted.
- the voltage Vin is lowered to the ground voltage at the time t 3 .
- a back electromotive force generated by the motor due to its regeneration state is absorbed by, e.g., the shunt resistors that are originally (e.g., primarily) used for drive control for the motor, as thermal energy. Consequently, it is not necessary to provide additional resistive elements specifically for back electromotive force absorption to the motor driving device 100 . Accordingly, there is no specific need to provide a large-sized regeneration resistor and MOS FET, the MOS FET being a switch for control, which are needed in patent document 1. Accordingly, an increase in size of the circuits in the device can be prevented, and thus, the manufacturing costs, etc., of the device can be reduced.
- Shunt resistors exhibit a low resistance since they are usually used for current measurement. Accordingly, a back electromotive force generated as a result of the motor's regeneration state is gradually absorbed by the shunt resistors. In this case, the mechanical load imposed on the motor is lower compared to the case where the motor is suddenly stopped by a dynamic brake formed by directly short-circuiting the motor drive wires for the U-phase, the V-phase and the W-phase via switches or the like. Consequently, the possibility of breakage of the motor can be reduced. Also, because of the resistance values being low, there is only a small problem in heat generation in the resistive elements.
- the NPN transistors included in the inverter unit 20 may be MOS FETs or Insulated Gate Bipolar Transistors.
- the brushless DC motor 30 may be a two-phase or multiple-phase motor, rather than a three-phase motor.
- a triangle wave has been used for a carrier for pulse width modulation, e.g., a sawtooth wave may be used.
- the resistive element R 21 to R 23 may be connected between the high-side transistors (Q 1 , Q 3 and Q 5 ) in the inverter unit 20 and the terminal 21 , rather than being connected between the low-side transistors (Q 2 , Q 4 and Q 6 ) and the ground voltage (terminal T 22 ) as illustrated in FIG. 1 .
- the control unit 40 performs control so that the high-side transistors are in an on-state and the low side transistors are in an off state during an abnormal state.
- the positions to connect the resistive elements R 21 to R 23 there is no specific limitation on the positions to connect the resistive elements R 21 to R 23 .
- the motor driving device may be installed in various products (a product 200 in FIG. 9 ), for example, home electric appliances, vehicles, etc. with great benefit.
Abstract
A data processing apparatus that controls an inverter circuit for a motor. The data processing apparatus including a control unit that monitors a potential of a power supply terminal to supply power to the inverter circuit, and obtains an information indicative of an amount of a driving current flowing in a motor winding of the motor in response to an amount of a current flowing in a resistive element included in the inverter circuit, to control a driving of the motor. The control unit makes the motor winding and the resistive element form a loop circuit, when the potential of the power supply terminal exceeds a predetermined value.
Description
- The present application is a Divisional application of U.S. patent application Ser. No. 12/457,206, filed on Jun. 3, 2009, which is based and claims priority from Japanese Patent Application No. 2008-153175, filed on Jun. 11, 2008, the entire contents of which is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a motor driving device and to a control method for the motor driving device, and specifically to a motor driving device for a brushless direct-current (hereinafter, referred to as “DC”) motor and to a control method for the motor driving device.
- 2. Description of Related Art
- Currently, in the field of consumer products, such as washing machines, refrigerators and air conditioners, for which machine downsizing has been demanded, small-sized and high-power permanent magnet synchronous motors have broadly been employed.
- Also, in recent years, progress in technical innovation of power devices such as a Metal-Oxide-Semiconductor Field-Effect Transistor (hereinafter, referred to as “MOS FET”) has been seen. Thus, it has become possible to perform inverter control in which a commercial alternating current (hereinafter, referred to as “AC”) power supply is first rectified to be converted into a DC, and then re-produced to have a desired drive waveform by the switching-on/off of power devices. This inverter control easily provides power consumption reduction and also provides easy control. Currently, brushless DC motors, in which such a permanent magnet synchronous motor as described above is driven by inverter control, have widely been used.
-
FIG. 4 illustrates aninverter circuit 1 in a commonly-used brushless DC motor. As illustrated inFIG. 4 , theinverter circuit 1 includes transistors Q1 to Q6. The transistors Q1 and Q2, Q3 and Q4, and Q5 and Q6 are respectively connected in series between a DC power supply voltage VDD and a ground voltage GND. Control signals U+, U−, V+, V−, W+ and W− are input to the transistors Q1 to Q6, respectively. -
FIG. 5 illustrates an example of operation waveforms of the voltages of these control signals U+, U−, V+, V−, W+ and W−. Based on the pulse waveforms illustrated inFIG. 5 , the transistors Q1 to Q6 perform switching operation in which they are repeatedly turned on or off. For example, at times t0 to t2, the control signals U+ and V− are coincidentally at a high level, and thus, the transistors Q1 and Q4 are coincidentally in an on-state. Consequently, currents flow in the coils in the U-phase and the V-phase of abrushless DC motor 2. Similarly, at times t2 to t4, control signals V+ and W− are coincidentally at a high level, and thus, the transistors Q3 and Q6 are coincidentally in an on-state. Consequently, currents flow in the coils in the V-phase and the W-phase of thebrushless DC motor 2. Subsequently, the transistors are switched on/off based on the control signals in such a manner as described above, enabling theinverter circuit 1 to generate drive current for thebrushless DC motor 2. - In this example, the
brushless DC motor 2 is a three-phase motor. Accordingly, the on/off state of the transistors Q1 to Q6 is adjusted so that currents flowing in the coils in the U-phase, the V-phase and the W-phase of thebrushless DC motor 2 flow in phases shifted from one another by 120°. The control signals U−, V− and W− are signals that are inversions of the control signals U+, W+ and V+, respectively. - Furthermore, pulse width modulation (hereinafter, referred to as “PWM”) is used for motor drive control by the switching mentioned above. This PWM control is currently most commonly used as a DC motor control method. A brief description of PWM control will be provided with reference to
FIGS. 6A and 6B . The graph inFIG. 6B illustrates one of the control signals U+, U−, V+, V−, W+ and W− being subjected to pulse-width modulation, for example, the control signal U+. Each of the other control signals is a signal having a wavelength similar to that of the example or a signal that is an inversion thereof, though its phase is shifted from that of the example. - PWM control in the example, as illustrated in
FIG. 6A , uses a triangle wave as a carrier. Also, in order to control, e.g., the rotation speed of the motor to have a desired value, a command voltage signal, which is illustrated inFIG. 6A , is used. This command voltage signal and the triangle wave are compared with each other to determine the pulse widths of the control signal U+, as illustrated inFIG. 6B . - As illustrated in
FIG. 6B , where the amplitude voltage of the command voltage signal is high, the widths of the pulses of the control signal U+ are large. Conversely, where the amplitude voltage is low, the pulse widths of the control signal U+ are small. Where the pulse widths are large, the on-state of the transistor lasts for a relatively long time, resulting in an increase in the currents flowing in the coils of the motor, and thereby raising the rotation speed of the motor. Conversely, where the pulse widths are small, the on-state of the transistor lasts only for a short time, thereby lowering the rotation speed of the motor. As described above, in PWM control, a command voltage signal is subjected to pulse width modulation, and the rotation speed of the motor is controlled by, e.g., the control signal U+ subjected to pulse width modulation. - Here, in inverter control for a brushless DC motor as described above, where it becomes unable to perform motor drive control due to, e.g., sudden deceleration of the motor or a system failure, the motor enters a regeneration (power generation) state due to the load-side inertia, generating a large back electromotive force (emf). In order to prevent the motor, the transistors, etc., in the inverter circuit, or a smoothing capacitor in a converter circuit that supplies the inverter circuit with power, from being broken due to such back electromotive force, a mechanism for back electromotive force removal is needed.
- JP-A-HEI-6-343291 discloses a back electromotive
force removal device 3 that upon the voltage on the input side of an inverter being abnormally increased by a back electromotive force from a motor, a current is made to flow in a regeneration load resistor to remove the back electromotive force.FIG. 7 illustrates a configuration of the back electromotiveforce removal device 3. As illustrated inFIG. 7 , the back electromotiveforce removal device 3 includes apower supply unit 4, a back electromotiveforce detection unit 5, a MOSFET base driver 6, a back electromotiveforce removal unit 7, afirst display unit 8 and asecond display unit 9. - However, the present inventor has recognized the following point. Namely, in the back electromotive
force removal device 3 according to JP-A-HEI-6-343291, upon an abnormal voltage, which has been increased by a back electromotive force, being detected between power supply input terminals DC+ and DC−, a MOS FET 71 in the back electromotiveforce removal unit 7 is controlled to be turned on or off. Consequently, a current I73 is made to flow in a regeneration load resistor R72 connected between the power supply input terminals DC+ and DC− and consumed as thermal energy, thereby removing the back electromotive force. However, in this method, a plethora of current I73 flows instantaneously in the regeneration Load resistor R72. Consequently, the back electromotiveforce removal unit 7 is required to have a large generation load resistor 72 and MOS FET 71, which can tolerate the plethora of current, thereby increasing the circuit size. In addition, a control circuit dedicated to control the on/off state of the MOS FET 71 is required, thereby also increasing the circuit size. - The present invention seeks to solve one or more of the above problems, or to improve upon those problems at least in part.
- In one exemplary embodiment, a motor driving device includes a first power supply terminal, a second power supply terminal, a drive unit that is coupled to the first power supply terminal, the second power supply terminal, and a motor winding, a control unit that controls the drive unit, and a resistive element that is coupled between the drive unit and the first power supply terminal. The control unit makes the motor winding and the resistive element form a loop circuit when a voltage between the first power supply terminal and the second power supply terminal exceeds a predetermined value.
- In another exemplary embodiment, a control method is provided for a motor driving device which includes a drive unit coupled to a first power supply terminal, a second power supply terminal, and a motor winding, and a resistive element coupled between the drive unit and the first power supply terminal. The control method includes making the motor winding and the resistive element form a loop circuit when a voltage between the first power supply terminal and the second power supply terminal exceeds a predetermined value.
- In yet another exemplary embodiment, a data processing apparatus controls an inverter circuit for a motor. The data processing apparatus includes a control unit that monitors a potential of a power supply terminal to supply power to the inverter circuit, and obtains an information indicative of an amount of a driving current flowing in a motor winding of the motor in response to an amount of a current flowing in a resistive element included in the inverter circuit, to control a driving of the motor. The control unit makes the motor winding and the resistive element form a loop circuit when the potential of the power supply terminal exceeds a predetermined value.
- Therefore, when the voltage of the first power supply terminal is increased to a predetermined value due to a back electromotive force as result of the motor entering, e.g., a regeneration (power generation) state, the motor winding and the resistive element form a closed loop configuration. Consequently, the back electromotive force can be absorbed by the resistive element as thermal energy. Further, the present invention enables absorption of a back electromotive force without increasing a circuit size.
- The above and other purposes, advantages and features of the present invention will become more apparent from the following description of a certain exemplary embodiment taken in conjunction with the accompanying drawings in which:
-
FIG. 1 illustrates an example of a configuration driving device an example of an operation timing chart for amotor driving device 100 according to the first exemplary embodiment; -
FIG. 2B illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment; -
FIG. 2C illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment; -
FIG. 3A illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment; -
FIG. 3B illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment; -
FIG. 3C illustrates an example of an operation timing chart for a motor driving device according to the first exemplary embodiment; -
FIG. 4 illustrates an example of a configuration of a motor driving device according to a related art; -
FIG. 5 illustrates, an example of an operation timing chart for aninverter unit 1 according to a related art; -
FIG. 6A illustrates an example of a timing chart for describing PWM control; -
FIG. 6B illustrates an example of a timing char or describing PWM control; -
FIG. 7 illustrates a configuration of a back electromotive force removal device of JP-A-HEI-6-343291; -
FIG. 8 illustrates a variation of a configuration of a motor driving device according to a first exemplary embodiment; and -
FIG. 9 is a diagram showing an example of installing in a product. - The invention will now be described herein with reference to an illustrative exemplary embodiment. Those skilled in the art will recognize that many alternative embodiments can be accomplished using the knowledge of the present invention, and that the invention is not limited to the exemplary embodiment illustrated for explanatory purposes.
- Hereinafter, a first exemplary embodiment of the present invention will be described with reference to the accompanying drawings.
- The first exemplary embodiment is one in which the present invention is applied to a motor driving device.
FIG. 1 illustrates an example of the configuration of amotor driving device 100 according to the first exemplary embodiment. As illustrated inFIG. 1 , themotor driving device 100 includes aconverter unit 10, aninverter unit 20, abrushless DC motor 30 and acontrol unit 40. - The
converter unit 10 rectifies a voltage from a commonly-used commercialAC power supply 11 and converts the voltage into a DC voltage. Theconverter unit 10 includes input terminals T11 and T12, output terminals T13 and T14, rectifier diodes D11 to D14, and a smoothing capacitor C11. It also includes input terminals T11 and T12, and output terminals T13 and T14. The anode of the rectifier diode D11 is connected to the input terminal T11, and the cathode of the rectifier diode D11 is connected to the output terminal T13. The anode of the rectifier diode D12 is connected to the input terminal T12 and the cathode of the rectifier diode D12 is connected to the output terminal T13. The anode of the rectifier diode D13 is connected to the output terminal T14, and the cathode of the rectifier diode D13 is connected to the input terminal T11. The anode of the rectifier diode D14 is connected to the output terminal T14, and the cathode of the rectifier diode D14 is connected to the input terminal T12. One terminal of the smoothing capacitor C11 is connected to the output terminal T13, and the other terminal of the smoothing capacitor C11 is connected to the output terminal T14. A ground voltage terminal GND is connected to the output terminal T14. - The
inverter unit 20 includes NPN transistors Q1 to Q6, clamp diodes D21 to D26, and resistive elements R21 to R23. It also includes power supply input terminals T21 and T22, and output terminals T23 to T25. - The NPN transistors Q1 to Q6 are switching elements (i.e., a drive unit) for controlling motor drive currents flowing in the U-phase, the V-phase and the W-phase of the
brushless DC motor 30, which will be described later. - The collector of the NPN transistor Q1 is connected to the input terminal T21, and the emitter of the NPN transistor Q1 is connected to a node A1. The collector of the NPN transistor Q2 is connected to the node A1, and the emitter of the NPN transistor Q2 is connected to a node A2. The collector of the NPN transistor Q3 is connected to the input terminal T21, and the emitter of the NPN transistor Q3 is connected to a node B1. The collector of the NPN transistor Q4 is connected to the node B1, and the emitter of the NPN transistor Q4 is connected to a node B2. The collector of the NPN transistor Q5 is connected to the input terminal T21, and the emitter of the NPN transistor Q5 is connected to a node C1. The collector of the NPN transistor Q6 is connected to the node C1, and the emitter of the NPN transistor Q6 is connected to a node C2.
- Control signals U+, U−, V+, V−, W+ and W− from the
control unit 40 are input to the bases of the NPN transistors Q1 to Q6, respectively. The nodes A1 to C1 are connected to the output terminals T23 to T25, respectively. - The clamp diodes D21 to D26 are connected between the collectors and the emitters of the NPN transistors Q1 to Q6 in non-parallel fashion to the NPN transistors Q1 to Q6, respectively,
- The resistive elements R21 to R23 are resistors for detecting motor drive currents flowing in the U-phase, the V-phase and the W-phase of the
brushless DC motor 30. By measuring the amounts or phases of currents flowing in these resistive elements R21 to R23, which phase a current flows in thebrushless DC motor 30 can be detected. Also, by measuring the phase of this current, information such as the rotational position of the rotor in thebrushless DC motor 30 can be obtained. It is desirable that these resistive elements R21 to R23 be formed by shunt resistors because they are used for current measurement. However, the resistive elements, R21 to R23 are not limited only to shunt resistors in terms of the resistor type. - The
brushless DC motor 30 includes, e.g., a permanent magnet synchronous motor. Thebrushless DC motor 30 includes coils for three phases, i.e., the U-phase, the V-phase and the W-phase as stators. Upon currents from theinverter unit 20 flowing in these three-phase coils, a rotor including a permanent magnet rotates. The coils in the U-phase, the V-phase and the W-phase of thebrushless DC motor 30 are connected to the output terminals T23, T24 and T25 of theinverter unit 20, respectively. - The
control unit 40 generates the control signals U+, U−, V+, V−, W+ and W− and outputs them to theinverter unit 20. Also, it monitors a voltage Vin between the input terminals T21 and T22 of theinverter unit 20. Also, it monitors the voltages of the nodes A2, B2 and C2, and measures currents flowing in the resistive elements R21 to R23. This enables detection of a failure, etc., occurring in thebrushless DC motor 30 when an over-current flows in any of the resistive elements R21 to R23. Furthermore, by measuring the phases of the currents flowing in the resistive elements R21 to R23, for example, the position of the rotor in thebrushless DC motor 30 can be detected. - The
control unit 40 includes a trianglewave generating circuit 41. The trianglewave generating circuit 41 generates a triangle wave as a carrier for PWM control. The trianglewave generating circuit 41 may be provided outside thecontrol unit 40, and supply a triangle wave that thecircuit 41 has generated to thecontrol unit 40. - In a normal operation state, the
control unit 40 outputs the control signals U+, U−, V+, V−, W+ and W− subjected to pulse width modulation, which are similar to that described with reference to the timing chart inFIG. 6B . The switching-on/off of the NPN transistors Q1 to Q6 in theinverter unit 20 is controlled by these control signals U+, U−, V+, V−, W+ and W−. Here, the currents flowing in the NPN transistors Q1 to Q6 are output to the output terminals T23 to T25 as drive currents for thebrushless DC motor 30. The control signals U+, U−, V+, V−, W+ and W− are subjected to pulse width modulation using a triangle wave generated by the trianglewave generating circuit 41 and a command voltage signal. Here, the command voltage signal is a control signal for controlling thebrushless DC motor 30 to have a desired rotation speed. Since the relationship between this triangle wave, the command voltage signal and the pulse widths of the generated control signal U+, etc., are similar to that described with reference toFIGS. 6A and 6B , a description thereof will be omitted. - When the voltage Vin between the input terminals T21 and T22 of the
inverter unit 20 becomes an abnormal voltage equal to or exceeding an abnormality detection voltage Ve, thecontrol unit 40 performs control so as to forcibly make the NPN transistors Q1, Q3 and Q5 enter an off-state and make the NPN transistors Q2, Q4 and Q6 enter an on-state by the control signals U+, U−, V+, V−, W+ and W−. - Next, an operation of the
motor driving device 100, which has been described above, will be described in detail with reference to the drawings. -
FIGS. 2A , 2B and 2C illustrate a timing of an operation of themotor driving device 100.FIG. 2A indicates the voltage between the input terminals T21 and T22 of theinverter unit 20.FIG. 2B illustrates the pulse waveform of the control signal U+.FIG. 2C illustrates the pulse waveform of the control signal U−. In this example, description will be made only on the control signals U+ and U−. - As illustrated in
FIG. 2A , times from t0 to t1, the voltage Vin between the input terminals T21 and T22 of theinverter unit 20, which is detected by thecontrol unit 40, is constantly a reference voltage Vref. Accordingly, the control signals U+ and U− output by thecontrol unit 40 to theinverter unit 20 each have a pulse waveform in a normal operation state. - Here, at the time t1, the
motor driving device 100 becomes unable to perform drive control for the motor due to, e.g., sudden deceleration of thebrushless DC motor 30 or a system failure. In this case, the motor enters a regeneration state (power generation state) due to, e.g., the load inertia. A back electromotive force from the motor raises the voltage Vin on the input side, that is, between the input terminals T21 and T22, of theinverter unit 20. - At the time t2, the voltage Vin between the input terminals T21 and T22 of the
inverter unit 20, which is detected by thecontrol unit 40, becomes larger than the abnormality detection voltage Ve (hereinafter, referred to as “abnormal state”). Here, thecontrol unit 40 fixes the control signals U+, V+ and W+ at a low level and the control signals U−, V− and W− at a high level. Consequently, the NPN transistors Q1, Q3 and Q5 are forcibly brought to an off-state, and the NPN transistors Q2, Q4 and Q6 are forcibly brought to an on-state. In other words, all the transistors on the high side of theinverter unit 20 are interrupted, and all the transistors on the low side enter a conductive state. Upon all the transistors on the low side entering a conductive state, motor drive wires for the U-phase, the V-phase and the W-phase of thebrushless DC motor 30 and the resistive elements R21 to R23 form a closed loop. Consequently, the back electromotive force generated by the motor due to its regeneration state is absorbed by the resistive elements R21 to R23 as thermal energy, and the voltage Vin between the input terminals T21 and T22 gradually decreases. - At a time t3, the voltage Vin between the input terminals T21 and T22 is lowered to the reference voltage Vref, thereby ending the abnormal state. Subsequently, the
control unit 40 may output the control signals U+, U−, V+, V−, W+ and W− in a normal operation state again to theinverter unit 20. Also, where thecontrol unit 40 determines that the drive control for the motor cannot be performed due to, e.g., a system failure, it is possible to continue fixing the control signals U+, V+ and W+ at a low level and fixing the control signals U−, V− and W− at a high level. - Also, at the time when the
control unit 40 has detected an abnormal state, theconverter unit 10's power supply to theinverter unit 20 may be interrupted. In this case, as illustrated inFIGS. 3A , 3B and 3C, the voltage Vin is lowered to the ground voltage at the time t3. - As described above, in the
motor driving device 100 according to the first exemplary embodiment, a back electromotive force generated by the motor due to its regeneration state is absorbed by, e.g., the shunt resistors that are originally (e.g., primarily) used for drive control for the motor, as thermal energy. Consequently, it is not necessary to provide additional resistive elements specifically for back electromotive force absorption to themotor driving device 100. Accordingly, there is no specific need to provide a large-sized regeneration resistor and MOS FET, the MOS FET being a switch for control, which are needed inpatent document 1. Accordingly, an increase in size of the circuits in the device can be prevented, and thus, the manufacturing costs, etc., of the device can be reduced. - Also, upon detection of a predetermined voltage such as the abnormality detection voltage Ve, the above-described operation starts, and thus, an advantage can be provided in eliminating the necessity to use transistors and/or smoothing capacitors having an excessive pressure resistance.
- Also, where shunt resistors are used for the resistive elements R21 to R23, the following advantage can be provided. Shunt resistors exhibit a low resistance since they are usually used for current measurement. Accordingly, a back electromotive force generated as a result of the motor's regeneration state is gradually absorbed by the shunt resistors. In this case, the mechanical load imposed on the motor is lower compared to the case where the motor is suddenly stopped by a dynamic brake formed by directly short-circuiting the motor drive wires for the U-phase, the V-phase and the W-phase via switches or the like. Consequently, the possibility of breakage of the motor can be reduced. Also, because of the resistance values being low, there is only a small problem in heat generation in the resistive elements.
- Furthermore, the NPN transistors included in the
inverter unit 20 may be MOS FETs or Insulated Gate Bipolar Transistors. Also, thebrushless DC motor 30 may be a two-phase or multiple-phase motor, rather than a three-phase motor. Also, although a triangle wave has been used for a carrier for pulse width modulation, e.g., a sawtooth wave may be used. - Also, as shown in
FIG. 8 , the resistive element R21 to R23 may be connected between the high-side transistors (Q1, Q3 and Q5) in theinverter unit 20 and the terminal 21, rather than being connected between the low-side transistors (Q2, Q4 and Q6) and the ground voltage (terminal T22) as illustrated inFIG. 1 . In this case, thecontrol unit 40 performs control so that the high-side transistors are in an on-state and the low side transistors are in an off state during an abnormal state. As described above, since it is only necessary to form a closed loop by the motor and the resistive elements R21 to R23 during an abnormal state, there is no specific limitation on the positions to connect the resistive elements R21 to R23. - Furthermore, as shown in
FIG. 9 , the motor driving device may be installed in various products (aproduct 200 inFIG. 9 ), for example, home electric appliances, vehicles, etc. with great benefit. - Although the invention has been described above in connection with an exemplary embodiment thereof, it will be appreciated by those skilled in the art that this exemplary embodiment is provided solely for illustrating the invention, and should not be relied upon to construe the appended claims in a limiting sense.
- Further, it is noted that, notwithstanding any claim amendments made hereafter, applicant's intent is to encompass equivalents all claim elements, even if amended later during prosecution.
Claims (4)
1. A data processing apparatus that controls an inverter circuit for a motor, the data processing apparatus comprising:
a control unit that monitors a potential of a power supply terminal to supply power to the inverter circuit, and obtains an information indicative of an amount of a driving current flowing in a motor winding of the motor in response to an amount of a current flowing in a resistive element included in the inverter circuit, to control a driving of the motor,
wherein the control unit makes the motor winding and the resistive element form a loop circuit, when the potential of the power supply terminal exceeds a predetermined value.
2. The data processing apparatus according to claim 1 , wherein the control unit generates pulse signals for operating the inverter circuit by a pulse width modulation control, and outputs the pulse signals to gates of transistors included in the inverter circuit, respectively.
3. A control method for a data processing apparatus that controls an inverter circuit including a drive unit coupled to a power supply terminal and a motor winding, and a resistive element, the control method comprising:
monitoring a potential of the power supply terminal to supply power to the inverter circuit;
obtaining an information indicative of an amount of a driving current flowing in the motor winding of a motor in response to an amount of a current flowing in the resistive element, to control a driving of the motor; and
making the motor winding and the resistive element form a loop circuit, when the potential of the power supply terminal exceeds a predetermined value.
4. The control method according to claim 3 , further comprising:
generating pulse signals for operating the inverter circuit by a pulse width modulation control; and
outputting the pulse signals to gates of transistors included in the inverter circuit, respectively.
Priority Applications (1)
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US13/528,552 US20120256573A1 (en) | 2008-06-11 | 2012-06-20 | Motor driving device, and control method of motor driving device |
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JP2008153175A JP2009303338A (en) | 2008-06-11 | 2008-06-11 | Motor driving device and control method of motor driving device |
JP2008-153175 | 2008-06-11 | ||
US12/457,206 US8237396B2 (en) | 2008-06-11 | 2009-06-03 | Motor driving device, and control method of motor driving device |
US13/528,552 US20120256573A1 (en) | 2008-06-11 | 2012-06-20 | Motor driving device, and control method of motor driving device |
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US12/457,206 Division US8237396B2 (en) | 2008-06-11 | 2009-06-03 | Motor driving device, and control method of motor driving device |
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US13/528,552 Abandoned US20120256573A1 (en) | 2008-06-11 | 2012-06-20 | Motor driving device, and control method of motor driving device |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10177691B2 (en) | 2016-07-06 | 2019-01-08 | Black & Decker Inc. | Electronic braking of brushless DC motor in a power tool |
US20200295632A1 (en) * | 2017-11-29 | 2020-09-17 | Nidec Corporation | Identification method for identifying type of brushless dc motor, identification device, and brushless dc motor |
US10812006B2 (en) | 2018-02-11 | 2020-10-20 | Silergy Semiconductor Technology (Hangzhou) Ltd | Motor drive device, control method and motor |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI357715B (en) * | 2008-04-23 | 2012-02-01 | Leadtrend Tech Corp | Motor control circuit and related operation method |
CN102088271B (en) * | 2010-12-20 | 2013-03-20 | 广东美的电器股份有限公司 | Sensor-less sine DC (direct current) variable frequency current sampling method |
EP2786462B1 (en) * | 2011-12-03 | 2015-08-19 | Diehl AKO Stiftung & Co. KG | Method for controlling a multiphase converter |
JP5997458B2 (en) * | 2012-02-22 | 2016-09-28 | ローム株式会社 | Rotation control device and method, and disk drive device using the same |
KR101752532B1 (en) * | 2014-10-21 | 2017-06-29 | 엘에스산전 주식회사 | Method for controlling inverter |
JP6598563B2 (en) * | 2015-08-05 | 2019-10-30 | ルネサスエレクトロニクス株式会社 | Signal converter and control device |
US11205982B2 (en) * | 2015-09-21 | 2021-12-21 | Lord Corporation | Actuator motion controller with regeneration compensation |
EP3293877A1 (en) * | 2016-09-09 | 2018-03-14 | Black & Decker Inc. | Dual-inverter for a brushless motor |
JP7091815B2 (en) * | 2018-05-07 | 2022-06-28 | 株式会社デンソー | Power converter control circuit |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008193877A (en) * | 2007-02-08 | 2008-08-21 | Mitsubishi Electric Corp | Electric motor, motor driving controller and ventilation fan, pump for liquid, cooling medium compressor, blower, air-conditioning system, and refrigerator |
JP2009153247A (en) * | 2007-12-19 | 2009-07-09 | Mitsubishi Electric Corp | Motor drive controller, motor drive control method and coordinate conversion method, and ventilation fan, liquid pump, blower, refrigerant compressor, air conditioner and refrigerator |
JP2010063200A (en) * | 2008-09-01 | 2010-03-18 | Mitsubishi Electric Corp | Motor with built-in driving circuit, air conditioner equipped with it, ventilating fan, and heat pump type water heater |
JP2012016274A (en) * | 2007-08-02 | 2012-01-19 | Mitsubishi Electric Corp | Motor drive controller and air conditioner, fan, and heat pump-type hot-water supply device |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0736716B2 (en) * | 1983-10-18 | 1995-04-19 | 株式会社明電舍 | How to pick up a motor |
KR930007594B1 (en) | 1990-08-24 | 1993-08-13 | 삼성전자 주식회사 | Metal oxide semiconductor-fet using motor reverse electromotive force excluded circuit |
US5486743A (en) * | 1992-11-19 | 1996-01-23 | Kabushiki Kaisha Toshiba | Inverter and air conditioner controlled by the same |
JP4512211B2 (en) * | 1999-01-25 | 2010-07-28 | 株式会社日立産機システム | Current control circuit, inverter control device, inverter device, and power conversion device |
JP2002101689A (en) * | 2000-09-26 | 2002-04-05 | Toshiba Corp | Drive controller of electric motor |
US6828751B2 (en) * | 2001-06-13 | 2004-12-07 | Emerson Electric Co. | Induction motor control system |
JP3896855B2 (en) * | 2002-01-23 | 2007-03-22 | 松下電器産業株式会社 | Motor drive device |
DE102006032491A1 (en) * | 2006-07-13 | 2008-01-17 | Siemens Ag | Method and device for determining the rotor position in a brushless and sensorless electric motor |
JP4715677B2 (en) * | 2006-08-11 | 2011-07-06 | 株式会社デンソー | Control device for three-phase rotating machine |
-
2008
- 2008-06-11 JP JP2008153175A patent/JP2009303338A/en active Pending
-
2009
- 2009-06-03 US US12/457,206 patent/US8237396B2/en not_active Expired - Fee Related
-
2012
- 2012-06-20 US US13/528,552 patent/US20120256573A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008193877A (en) * | 2007-02-08 | 2008-08-21 | Mitsubishi Electric Corp | Electric motor, motor driving controller and ventilation fan, pump for liquid, cooling medium compressor, blower, air-conditioning system, and refrigerator |
JP2012016274A (en) * | 2007-08-02 | 2012-01-19 | Mitsubishi Electric Corp | Motor drive controller and air conditioner, fan, and heat pump-type hot-water supply device |
JP2009153247A (en) * | 2007-12-19 | 2009-07-09 | Mitsubishi Electric Corp | Motor drive controller, motor drive control method and coordinate conversion method, and ventilation fan, liquid pump, blower, refrigerant compressor, air conditioner and refrigerator |
JP2010063200A (en) * | 2008-09-01 | 2010-03-18 | Mitsubishi Electric Corp | Motor with built-in driving circuit, air conditioner equipped with it, ventilating fan, and heat pump type water heater |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10177691B2 (en) | 2016-07-06 | 2019-01-08 | Black & Decker Inc. | Electronic braking of brushless DC motor in a power tool |
US20200295632A1 (en) * | 2017-11-29 | 2020-09-17 | Nidec Corporation | Identification method for identifying type of brushless dc motor, identification device, and brushless dc motor |
US10812006B2 (en) | 2018-02-11 | 2020-10-20 | Silergy Semiconductor Technology (Hangzhou) Ltd | Motor drive device, control method and motor |
Also Published As
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US8237396B2 (en) | 2012-08-07 |
US20090309523A1 (en) | 2009-12-17 |
JP2009303338A (en) | 2009-12-24 |
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