WO2015159358A1 - ブラシレスdcモータの駆動回路 - Google Patents
ブラシレスdcモータの駆動回路 Download PDFInfo
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- WO2015159358A1 WO2015159358A1 PCT/JP2014/060680 JP2014060680W WO2015159358A1 WO 2015159358 A1 WO2015159358 A1 WO 2015159358A1 JP 2014060680 W JP2014060680 W JP 2014060680W WO 2015159358 A1 WO2015159358 A1 WO 2015159358A1
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- transistor
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- detection coil
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- drive
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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
- H02P6/20—Arrangements for starting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/28—Manual switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/12—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using detecting coils using the machine windings as detecting coil
-
- 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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/46—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor
-
- 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
Definitions
- the present invention relates to a brushless DC motor drive circuit and a brushless DC motor using a DC power source such as a dry battery, and controls the energization of a detection coil accompanying the rotation of a rotor with a permanent magnet to control energization to the drive coil. It relates to the drive circuit used.
- This two-phase bidirectionally energized drive brushless DC motor circuit includes two Hall elements 202 arranged at different phase positions at both inputs of two push-pull circuits for two phases. By detecting the position of the rotor by the Hall element 202, the energization of each drive coil 201 arranged with a phase shift is controlled.
- Patent Document 1 As shown in FIG. 15B, a rotor 1 having a permanent magnet magnetized with an N magnetic pole and an S magnetic pole, a detection coil 3, a drive coil 2, and a drive current
- a circuit that includes a transistor 5 that controls the drive current and controls the drive current to the drive coil 2 by the electromotive force of the detection coil 3.
- Non-Patent Document 1 In the drive circuit described in Non-Patent Document 1 (FIG. 15A), in order to make the Hall element 202 work, the current indicated by Ih in the figure (input current 5 mA for obtaining the Hall element output voltage of about 100 mV). To 10 mA. Because of the two phases, 10 to 20 mA, which is twice as much, is required. For example, the current consumption greatly exceeds 0.1 to 2 mA, which is a practical power generation current of indoor solar cells, so that the problem of driving a brushless DC motor using such a small solar cell is not addressed. It was not usable.
- the present invention provides a drive circuit for a brushless DC motor that operates with low power without using a Hall element or the like, and is a brushless DC that can be started for general purposes regardless of the load weight.
- An object of the present invention is to provide a motor drive circuit.
- a drive coil disposed in the magnetic field of a permanent magnet provided in the rotor, a direct current power source for supplying drive power to the drive coil, a first transistor having a collector connected to the drive coil at grounded emitter, A second transistor having a collector connected to the base of the first transistor, a base current limiting resistor for adjusting a base current of the second transistor, and a magnetic field of the permanent magnet.
- a detection coil provided between the base and emitter of the second transistor, and connected in series with the detection coil between the base and emitter of the second transistor, the second transistor The diode is provided in the parallel forward direction with the current between the base and emitter, and is reversed by the induced electromotive force generated in the detection coil.
- the second transistor is turned on in a state where a forward voltage is applied, and the second transistor is turned off in a state where a forward voltage is applied by the induced electromotive force of the detection coil.
- a diode for controlling and adjusting a base current of the second transistor.
- the first transistor is a PNP type
- the second transistor is an NPN type
- the anode of the diode is connected to the base of the second transistor
- the cathode of the diode is connected to one end of the detection coil
- the first transistor is an NPN type
- the second transistor is a PNP type
- the cathode of the diode is connected to the base of the second transistor
- the anode of the diode is connected to one end of the detection coil, and 2.
- a first DC power source and a second DC power source connected in series, and a permanent magnet provided in the rotor are arranged in a magnetic field, and one end thereof is interposed between the first DC power source and the second DC power source.
- a second transistor having an emitter connected between the first DC power source and the second DC power source, a collector connected to a base of the first transistor, and a base of the second transistor.
- a first base current limiting resistor for adjusting a current and a detection coil disposed in the magnetic field of the permanent magnet, the detection coil being provided between the base and emitter of the second transistor; A diode whose anode is connected to the base of the second transistor and whose cathode is connected to the detection coil, and in which a reverse voltage is applied by an induced electromotive force generated in the detection coil, the second transistor The base current of the second transistor is controlled and adjusted so that the second transistor is turned off when the forward voltage is applied by the induced electromotive force of the detection coil.
- a third diode having an emitter connected to the negative electrode side of the second DC power source and a collector connected to the other end of the drive coil, and a PNP transistor The emitter is connected between the first DC power source and the second DC power source, and the collector is the third DC power source.
- a fourth transistor connected to the base of the transistor, a second base current limiting resistor for adjusting the base current of the fourth transistor, and an anode connected to the detection coil and the cathode of the first diode.
- the cathode is connected to the base of the fourth transistor, and the fourth transistor is turned on in a state where a reverse voltage is applied by the induced electromotive force generated in the detection coil; and A second diode that controls and adjusts a base current of the fourth transistor so that the fourth transistor is turned off in a state where a forward voltage is applied by the induced electromotive force of the detection coil;
- a brushless DC motor drive circuit comprising:
- (Configuration 8) A rotor in which the permanent magnets are alternately arranged on the outer peripheral surface alternately with N poles and S poles, and a fixed yoke that is provided to face the permanent magnets of the rotor with a gap, and is formed on the inner peripheral surface.
- a radial gap type brushless DC motor characterized by that.
- the brushless DC motor driving circuit (and the brushless DC motor) of the present invention can be operated with a small electric power without using a Hall element or the like. Further, since the circuit configuration does not have to be changed (adjusted) according to the load weight (inertia moment magnitude), etc., it can be used for general purposes.
- FIG. 1 is a circuit diagram illustrating a brushless DC motor drive circuit according to a first embodiment.
- Explanatory drawing which shows the relationship between the drive current which flows into the drive coil with which the brushless DC motor drive circuit of Embodiment 1 is equipped, the base voltage of the transistor 14, and a rotor position.
- the graph which showed transition (Drawing (a)) of the base voltage of transistor 14 with which the brushless DC motor drive circuit of Embodiment 1 is provided, and transition (Drawing (b)) of the drive current which flows into the collector of transistor 13
- the circuit diagram which shows another circuit structure which has a function equivalent to the brushless DC motor drive circuit of Embodiment 1.
- the circuit diagram which shows the brushless DC motor drive circuit of Embodiment 2.
- FIG. 1 An exploded perspective view showing an axial gap type brushless DC motor provided in the turntable of Embodiment 3
- Circuit diagram showing a two-phase brushless DC motor drive circuit The figure which shows a radial type 2 phase drive brushless DC motor
- FIG. 1 is a circuit diagram showing a brushless DC motor drive circuit 1 of the present embodiment.
- the brushless DC motor drive circuit 1 of Embodiment 1 includes a stator to which a detection coil and a drive coil are fixed, and a permanent magnet disposed at a position facing the stator, and is a rotor that is pivotally supported. And a circuit for driving a brushless DC motor.
- the brushless DC motor drive circuit 1 includes a drive coil 11 disposed in a magnetic field of a permanent magnet provided in a rotor, and a DC power source that supplies drive power to the drive coil 11. 12, a transistor 13 (first transistor) whose collector is connected to the drive coil 11 with a common emitter, and a transistor 14 (second transistor) whose collector is connected to the base of the transistor 13 with a common emitter, A resistor (base current limiting resistor) 17 for adjusting the base current of the transistor 14 and a coil disposed in the same magnetic field of the permanent magnet together with the drive coil 11 and provided between the base and emitter of the transistor 14 Between the detection coil 15 and the base and emitter of the transistor 14, it is connected in series with the detection coil 15, A diode provided in a parallel forward direction with a current between the base and emitter of the star 14 so that the transistor 14 is turned on in a state where a reverse voltage is applied by an induced electromotive force generated in the detection coil 15.
- a diode 16 that adjusts the base-emitter voltage of the transistor 14 is provided so that the transistor 14 is turned off when a forward voltage is applied by the induced electromotive force of the detection coil 15.
- the “diode 16 connected in parallel with the base-emitter current of the transistor 14” means that the diode 16 connected in parallel between the base-emitter is in the current direction between the base-emitter ( It is provided in the forward direction with respect to the current direction parallel to the (forward direction).
- the anode of the diode 16 is connected to the base of the transistor 14, the cathode of the diode 16 is connected to one end of the detection coil 15, and the other end of the detection coil 15 is connected to the emitter of the transistor 14.
- the brushless DC motor drive circuit 1 includes a two-stage switching circuit of a transistor 13 (PNP type) and a transistor 14 (NPN type) in order to drive the drive coil 11 based on the induced electromotive force generated in the detection coil 15. ing. Further, in order to turn on and off the transistor 14 based on a small induced electromotive force generated in the detection coil 15, a diode 16 and a resistor 17 are provided (specifically described below).
- the brushless DC motor driving circuit 1 according to the first embodiment includes a current limiting resistor 18 connected between the base of the transistor 13 and the collector of the transistor 14, and a switch provided between the DC power supply 12 and the driving coil 11. 19.
- the resistor 18 is a resistor for limiting the collector current of the transistor 14 (base current of the transistor 13).
- the diode 16 is configured so that the transistor 14 is turned on in a state where the induced electromotive force generated in the detection coil 15 applies a reverse voltage to the diode 16, and the induced electromotive force of the detection coil 15 applies a forward voltage to the diode 16. In this state, the base-emitter voltage of the transistor 14 is adjusted so that the transistor 14 is turned off.
- the induced electromotive force generated in the detection coil 15 is an electromotive force generated when a permanent magnet provided in the rotor approaches or moves away from the detection coil 15 as the rotor rotates. That is, the detection coil 15 detects the rotational state of the rotor (generates an electromotive force according to the rotational position and rotational speed).
- the brushless DC motor drive circuit uses the induced electromotive force generated in the detection coil for energization control of the drive coil.
- the “transistor threshold value” in this specification is a limit value of V BE at which a transistor can be regarded as an on-operation. For example, when the relationship between the base-emitter voltage and the collector current of a transistor is such that the collector current flows at 80 ⁇ A when V BE is 0.5 V, when this transistor is used as the transistor 14, the current flows through the transistor 13.
- the collector current of the transistor 13 is 16 mA, and switching in a sufficiently saturated state can be performed.
- V BE of the transistor is 0.4 V and the collector current is 6 ⁇ A, the transistor 13 is turned off at this time.
- the “transistor threshold value” in this specification for this transistor can be said to be greater than 0.4V and around 0.5V.
- the threshold value of the transistor changes depending on the ambient temperature, and the base voltage of the transistor corresponding to the ambient temperature can be obtained by the forward voltage threshold value of the diode.
- FIG. 2 is an explanatory diagram showing the relationship between the base voltage (FIG. (B)) of the transistor 14 and the drive current (FIG. (C)) flowing in the drive coil 11 and the rotor position.
- FIG. 5 is a graph showing the transition of the base voltage (FIG. (A)) and the transition of the drive current flowing through the collector of the transistor 13 (FIG. (B)).
- an axial type brushless DC motor having two drive coils 11 and one detection coil 15 is used as an example (FIG. 2A).
- two drive coils 11 and one detection coil 15 are arranged at equal intervals in the circumferential direction on substantially the same plane as the plane perpendicular to the rotation axis of the rotor, Permanent magnets 102 facing each other with a slight gap with respect to the effective wire ring surfaces of these three coils have rotors arranged alternately with N magnetic poles and S magnetic poles. Further, in order to set the stop position (state A in FIG.
- FIG. 2 shows a coil portion that is in a direction substantially along the normal direction of the concentric circle of the rotating shaft.
- the power source voltage 1.6 V is supplied to the circuit from the DC power source 12 (specifically, a 1.6 V dry battery). .
- the DC power source 12 specifically, a 1.6 V dry battery.
- the start-up voltage indicated by the base-emitter voltage V BE of the transistor 14 shown in FIGS. 2B and 3A is caused by a minute current flowing from the power supply voltage to the diode 16 through the resistor 17.
- the voltage is slightly higher than the voltage drop (threshold voltage) in the diode.
- the base-emitter voltage of the transistor 14 is adjusted so as to slightly exceed the threshold value of the transistor 14, and a specific example is 0.6V, for example. (That is an example in which the threshold value of the transistor 14 is set slightly higher (about 0.1 V) when the threshold value is about 0.5 V). In other words, the voltage value slightly exceeding the threshold value is applied to V BE of the transistor 14 in consideration of the resistance value of the DC power source 12 and the resistor 17 and the diode 16.
- an induced electromotive force that becomes a forward voltage with respect to the diode 16 (a reverse voltage with respect to V BE of the transistor 14) starts to occur in the detection coil 15.
- the diode 16 takes only the voltage drop of the diode forward voltage, passes the induced electromotive force, sets the base voltage V BE of the transistor 14 to 0.4 V or less, and turns off the transistor 14.
- the voltage of V BE of the transistor 14 is the base reverse voltage indicated by the downward arrow in FIG.
- the transistor 13 is also turned off, and the drive current of the drive coil 11 is also turned off, as shown in FIGS. 2C and 3B.
- the base voltage (reverse voltage) of the transistor 14 due to the induced electromotive force of the detection coil 15 becomes maximum in the state C in FIG. 2 and stops the base current of the transistor 14 until the state D is reached. Stop energization.
- the induced electromotive force generated in the detection coil 15 is also generated alternately in positive and negative directions, whereby the on / off control of each transistor described above is performed, and the rotor is rotated at an accelerated speed.
- the drive current hangs down from the saturation current value because the drive current is reduced due to the counter electromotive force generated in the drive coil 11. This indicates that the current decrease due to the counter electromotive force increases as the rotational speed increases (this reduces the power consumption as a motor).
- the brushless DC motor drive circuit 1 of the present embodiment performs energization control of the drive coil 11 by the induced electromotive force generated in the detection coil 15 based on the rotation state of the rotor. Therefore, appropriate switching needs to be performed based on the small induced electromotive force generated in the detection coil 15, but the brushless DC motor driving circuit 1 according to the present invention realizes this by providing the above-described configuration. .
- the potential slightly exceeding the threshold value of the transistor 14 (a limit value at which the transistor can be regarded as an ON operation) is What is necessary is just to set the optimal element constants, such as a power supply, resistance, and a diode, so that it may be applied between emitters.
- the optimal element constants such as a power supply, resistance, and a diode
- the switching is turned on.
- V BE of the transistor 14 becomes a voltage of 0.4 V or less, and the transistor 14 is turned off to stop the base current. Is done.
- the specific value “slightly above” the threshold value of the transistor is appropriately determined based on the design concept of each product.
- the brushless DC motor driving circuit 1 operates with a small amount of electric power without using a Hall element or the like.
- a motor that rotates even with a small amount of electric power generated by photovoltaic power generation in an indoor solar cell. It can be. Even if it is operated with a dry battery or the like, it can be operated for a long time even with a small capacity, which is economical.
- the circuit configuration does not have to be changed (adjusted) according to the load weight (inertia moment), it can be used for general purposes.
- the transistor 13 is a PNP type and the transistor 14 is an NPN type.
- the cathode of the diode 26 is connected to the base of the transistor 24, the anode of the diode 26 is connected to one end of the detection coil 15, and the detection coil
- the other end of 15 may be connected to the emitter of the transistor 24 (positive and negative are inverted, but the operation concept is the same as described above).
- FIG. 5 is a circuit diagram illustrating a brushless DC motor driving circuit according to the second embodiment.
- the brushless DC motor drive circuit 3 of the second embodiment is a push-pull type combining the brushless DC motor drive circuit 1 (FIG. 1) and the brushless DC motor drive circuit 2 (FIG. 4) of the first embodiment.
- FIG. 5 the same reference numerals are used for the same elements as those in FIG. 1 or FIG. 4, and the description here is omitted or simplified.
- the collectors of a PNP transistor 13 (first transistor) and an NPN transistor 23 (third transistor) are connected to each other, and an NPN transistor 14 (second transistor) and a PNP transistor are connected.
- the emitters of 24 (fourth transistor) are connected to each other, and the cathode of the diode 16 and the anode of the diode 26 are connected to connect the circuits of FIG. 1 and FIG. Thereby, the drive coil 11 and the detection coil 15 are made common.
- the operation concept of the brushless DC motor drive circuit 3 of the second embodiment is basically the same as that described in the first embodiment.
- a driving force is given only to the magnetic poles generated by energizing the driving coil in any one direction.
- the brushless DC motor driving circuit 3 of FIG. This is a (push-pull) operation in which a driving force is applied to the magnetic poles generated by energization of the bidirectional driving coil. Specifically, it is as follows.
- the resistance values of the diodes 16 and 26 and the resistors 17 and 27 in the above-described configuration are set so as to obtain an appropriate V BE for switching the transistors 14 and 24 together.
- the upper circuit (part of FIG. 1) and the lower circuit (part of FIG. 4) have the same configuration in positive and negative directions. Therefore, at the time of activation when the switch 19 is turned on, the potential at the connection point of the series connection in which the rectifying directions of the two stone diodes 16 and 26 are aligned is the same as that of the connecting portion connecting the two DC power sources 12 and 22. Since they are at the same potential, no current flows during this time. That is, the upper circuit (portion in FIG. 1) and the lower circuit (portion in FIG. 5) are in a balanced state, and thus the drive coil 11 is not energized and the rotor is stopped.
- bidirectional switching energization of the drive coil 11 occurs continuously, and the rotor is accelerated and rotated by the electromagnetic force between the magnetic pole of the drive coil 11 and the permanent magnet magnetic pole of the rotor excited by the bidirectional energization. To do.
- FIG. 7A A circuit example related to this is shown in FIG. In addition, the same code
- a charge pump circuit including a capacitor 122 and a diode 123 is added to the DC power supply 12 of the upper circuit. As a result, the power supply voltage of the upper circuit is boosted when the interlock switch 19 is turned on, and the upper circuit is turned on at startup.
- the current limiting resistor 18 is shared by connecting it between the emitter connection point of the transistors 14 and 24 and the DC power sources 12 and 22 (reference potential).
- FIG. 7A a charge pump circuit including a capacitor 122 and a diode 123 is added to the DC power supply 12 of the upper circuit. As a result, the power supply voltage of the upper circuit is boosted when the interlock switch 19 is turned on, and the upper circuit is turned on at startup.
- the current limiting resistor 18 is shared by connecting it between the emitter connection point of the transistors 14 and 24 and the DC power sources 12 and 22 (reference
- the DC power sources 12 and 22 are configured by solar cells 123 and 223 and capacitors 124 and 224, respectively, and the voltage of the solar cell 123 in the upper circuit is set higher than that of the solar cell 223 in the lower circuit. Yes.
- the “DC power supply” may be configured by rectifying an AC power supply, for example, as shown in FIG. Also in this case, for example, the amount of winding of the secondary coil supplied with power from the AC power source P may be changed between the upper side and the lower side so as to be self-started in the intended rotation direction.
- FIG. 8 shows a configuration in which the start rotation direction selection operation and the automatic start / stop operation can be performed by adopting a configuration in which the position of the small magnet 101 can be changed.
- the small magnet 101 is installed at the position A or C in FIG. 8 to automatically start (the rotation direction is reversed between A and C). When the position is set to, it can be prevented from being automatically activated.
- FIG. 9 is a partially exploded perspective view showing the turntable according to the third embodiment.
- the turntable 100 includes an axial gap type brushless DC motor 50 driven by the drive circuit of FIG.
- the table 31 is rotated.
- a product placed on the table 31 is rotated and displayed for store advertising.
- the casing 32 is provided with an axial gap type brushless DC motor 50, and each of the connection lines to the solar cells 123, 223, a power transmission mechanism having an appropriate gear ratio, the rotating shaft of the table 31, the bearing thereof, and the like. The configuration is paid.
- FIG. 10 and 11 are diagrams showing an axial gap type brushless DC motor 50 (hereinafter simply referred to as “motor 50”), and FIG. 10A is an exploded perspective view showing the motor 50.
- FIG. FIG. 11A is a top view and FIG. 11B is a vertical sectional view.
- the motor 50 is roughly composed of three blocks: an upper rotor block 51, a stator block 52, and a lower rotor block 53.
- the stator block 52 is configured by a printed circuit board 521 for electrically connecting the coils (the detection coil 15 and the drive coil 11).
- the detection coil 15 and the drive coil 11 are air core coils, and in this embodiment, there are three drive coils. As shown in FIG. 10A, the detection coil 15 and the three drive coils 11 are arranged on the printed circuit board 521 at substantially equal intervals on the same plane.
- the printed circuit board 521 has a hole 524 formed at the center thereof so that the permanent magnet of the rotor is not touched.
- the detection coil 15 is soldered to the detection coil connection terminal 525 of the printed circuit board 521, and the drive coil 11 is soldered to each drive coil connection terminal 522, and is electrically connected to the drive circuit by a lead wire 523.
- the upper rotor block 51 is formed by integrally forming a disk portion 511 formed of polycarbonate and a hollow rectangular column 513 provided on the upper surface thereof, and is fixed to the yoke 514 in a recess formed on the lower surface of the disk portion 511.
- eight rare earth magnets 102 are fitted.
- rubber magnets 515 having outer N magnetic poles are attached to the four side surfaces of the quadrangular column 513.
- the lower rotor block 53 is also formed of polycarbonate, and a shaft support portion for mounting the shaft 40, a fitting portion for fitting with the upper rotor block 51, and the like are formed. Further, eight rare earth magnets 102 fixed to the lower yoke 534 are fitted into a recess formed on the upper surface of the disk portion 531.
- the motor 50 has a basic configuration by assembling the respective blocks and then integrating them while aligning the central portions.
- the upper and lower rare earth magnets 102 are arranged at a position facing the effective wire ring surface of each air-core coil arranged on the substantially same plane at equal intervals, with a slight gap.
- the Each integrated block is housed and assembled in a housing (upper housing 55, lower housing 56) that accommodates the blocks.
- a cylindrical cylindrical portion is formed in a portion of the upper housing 55 in which the quadrangular column 513 is accommodated, and the changeover switch mechanism 54 is attached to the outer periphery of the cylindrical portion, so that the motor 50 is configured.
- the changeover switch mechanism 54 is rotatably attached to the outer periphery of the cylindrical portion of the upper casing 55, and as shown in FIG. 11, N for repelling the rubber magnet 515 provided on the side surface of the square column 513.
- Four small polar magnets 542 are provided at equal intervals. Similar to the small magnet 101 in the first embodiment, this is for constraining the stop position of the rotor to a desired position, but in this embodiment, a magnet provided separately from the permanent magnet 102 (four
- the second embodiment is different from the first embodiment in that the magnetic force between the prism 513 and the rubber magnet 515 provided on the side surface of the prism 513 is used.
- FIG. 12 is a diagram for explaining the changeover switch mechanism 54.
- the rare earth magnets 102 are regulated to stop at positions facing the respective effective wire ring surfaces of the drive coil 11, so that there is power supply. Then, the rotation starts in a predetermined direction.
- the lever 541 is operated to the position shown in FIG. 2B in the stopped state shown in FIG. 1A, the rotor is brought into the state shown in FIG. 2C by the repulsive force of each rubber magnet 515 and each small magnet 542. In this position, since each rare earth magnet 102 is restricted so as not to face each effective line ring surface, self-activation does not occur even when power is supplied.
- the magnetic poles are arranged opposite to those shown in FIG. (A). Therefore, when power is supplied, rotation starts in the direction opposite to that shown in FIG. Is.
- the motor 50 according to the present embodiment is mainly composed of three blocks, and each block is assembled and then integrated, so that work efficiency is improved, manufacturing is easy, and parts management is performed. It is easy.
- the turntable has been described as an example here, the motor 50 of the present embodiment is highly efficient and can be used even with low power, and thus, for example, a small solar cell is used as a power source (or a small-capacity dry battery is used as a power source). It can be used for various purposes such as personal tabletop fans and fragrance diffusers.
- FIG. 13 is a circuit diagram showing a two-phase driving brushless DC motor driving circuit.
- the same components as those in FIG. 7B are denoted by the same reference numerals.
- each of the A phase and the B phase has the same circuit configuration as that of FIG. 7B, and the DC power sources 12 and 22 are used.
- the same thing as the printed circuit board 521 to which each coil is attached (for the A-phase coil). 22.5 °) is prepared for the B phase.
- the printed circuit board to which the coils for the A phase are attached and the printed circuit board to which the coils for the B phase are attached are arranged so that the coils of the A phase and the B phase are in close contact with each other (naturally. However, the coils of the A phase and the B phase are not electrically connected to each other), and are sandwiched between the upper casing 55 and the lower casing 56. Further, the upper rotor block 51 and the lower rotor block 53 are respectively provided with upper and lower eight pieces fixed to the yoke so as to face the effective wire ring surfaces of the coils that are shifted and overlapped for the A phase and the B phase. Install rare earth magnets. Thereby, powerful and stable driving by two-phase driving becomes possible.
- FIG. 14 shows an example of a radial brushless DC motor to which the brushless DC motor drive circuit according to the present invention is applied.
- FIG. 14 is a cross-sectional view of a radial gap brushless DC motor 60 (hereinafter simply referred to as a radial motor 60) in a plane perpendicular to the rotation axis.
- the radial motor 60 has a rotor 61 in which permanent magnets 102 are alternately arranged on the outer peripheral surface alternately with N poles and S poles, and is opposed to the rotor 61 with a slight gap.
- a fixed yoke 62 provided.
- a plurality of convex cores 621 are formed on the inner peripheral surface of the fixed yoke 62, and the detection coil 15 and the drive coil 11 are wound around the core 621.
- the interval between the cores 621 is determined so that the effective wire ring surface of each coil provided on the core 621 faces the permanent magnet 102.
- FIG. 14 for example, a two-phase radial motor driven by the drive circuit of FIG. 13 is shown, and the left side in FIG. 14 is the A phase and the right side is the B phase.
- the effective wire ring surface of the coil (one detection coil 15b and the plurality of drive coils 11b) and the boundary between the permanent magnets face each other (rotation force is minimum).
- the driving force is much larger than that using an air-core coil, and a rotating device that requires a large output, such as a signboard that rotates using an outdoor solar cell. It can be applied to.
- Brushless DC motor drive circuit . . Drive coil, 12. . . DC power supply, 13. . . Transistor (first transistor), 14. . . Transistor (second transistor), 15. . . Detection coil, 16. . . Diode, 17. . . Resistance (base current limiting resistance), 22. . . DC power supply (second DC power supply), 23. . . Transistor (third transistor), 24. . . Transistor (fourth transistor), 26. . . Diode (second diode), 27. . . Resistance (second base current limiting resistor), 50. . . 51. Axial gap type brushless DC motor . .
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Abstract
Description
これらの問題点は、負荷の慣性モーメントが一定であり、摩擦負荷も一定で、モータの起動時の加速度が一定であれば、コンデンサ容量を適切にすることで解消される。しかし、負荷に合わせていちいちコンデンサの容量を変え、起動時の駆動コイル通電時間を変えることは、汎用モータとしては不適なものであり、負荷の軽重や、慣性モーメントの大小に関わらず汎用的に利用できる起動回路が求められていた。
回転子に備えられる永久磁石の磁界内に配される駆動コイルと、前記駆動コイルに駆動電力を供給する直流電源と、エミッタ接地で、コレクタが前記駆動コイルに接続された第1のトランジスタと、エミッタ接地で、コレクタが前記第1のトランジスタのベースに接続された第2のトランジスタと、前記第2のトランジスタのベース電流を調整するベース電流制限用抵抗と、前記永久磁石の磁界内に配される検出コイルであって、前記第2のトランジスタのベース・エミッタ間に設けられる検出コイルと、前記第2のトランジスタのベース・エミッタ間に、前記検出コイルと直列に接続され、前記第2のトランジスタのベース・エミッタ間の電流と並走順方向に設けられるダイオードであって、前記検出コイルに生じる誘導起電力によって逆方向電圧がかけられた状態において前記第2のトランジスタがオンになるように、且つ、前記検出コイルの誘導起電力によって順方向電圧がかけられた状態においては前記第2のトランジスタがオフになるように、前記第2のトランジスタのベース電流を制御調整するダイオードと、を備えることを特徴とするブラシレスDCモータ駆動回路。
前記第1のトランジスタをPNP型、前記第2のトランジスタをNPN型とし、前記ダイオードのアノードが前記第2のトランジスタのベースに接続され、前記ダイオードのカソードが前記検出コイルの一端と接続され、当該検出コイルの他端が前記第2のトランジスタのエミッタに接続されることを特徴とする構成1に記載のブラシレスDCモータ駆動回路。
前記第1のトランジスタをNPN型、前記第2のトランジスタをPNP型とし、前記ダイオードのカソードが前記第2のトランジスタのベースに接続され、前記ダイオードのアノードが前記検出コイルの一端と接続され、当該検出コイルの他端が前記第2のトランジスタのエミッタに接続されることを特徴とする構成1に記載のブラシレスDCモータ駆動回路。
直列に接続される第1の直流電源及び第2の直流電源と、回転子に備えられる永久磁石の磁界内に配され、前記第1の直流電源と第2の直流電源の間にその一端を接続された駆動コイルと、PNP型トランジスタであって、エミッタが前記第1の直流電源の正極側に接続され、コレクタが前記駆動コイルの他端に接続される第1のトランジスタと、NPN型トランジスタであって、エミッタが前記第1の直流電源と第2の直流電源の間に接続され、コレクタが前記第1のトランジスタのベースに接続された第2のトランジスタと、前記第2のトランジスタのベース電流を調整する第1のベース電流制限用抵抗と、前記永久磁石の磁界内に配される検出コイルであって、前記第2のトランジスタのベース・エミッタ間に設けられる検出コイルと、アノードが前記第2のトランジスタのベースに接続され、カソードが前記検出コイルに接続されるダイオードであって、前記検出コイルに生じる誘導起電力によって逆方向電圧がかけられた状態において前記第2のトランジスタがオンになるように、且つ、前記検出コイルの誘導起電力によって順方向電圧がかけられた状態においては前記第2のトランジスタがオフになるように、前記第2のトランジスタのベース電流を制御調整する第1のダイオードと、NPN型トランジスタであって、エミッタが前記第2の直流電源の負極側に接続され、コレクタが前記駆動コイルの他端に接続される第3のトランジスタと、PNP型トランジスタであって、エミッタが前記第1の直流電源と第2の直流電源の間に接続され、コレクタが前記第3のトランジスタのベースに接続された第4のトランジスタと、前記第4のトランジスタのベース電流を調整する第2のベース電流制限用抵抗と、アノードが前記検出コイル及び前記第1のダイオードのカソードに接続され、カソードが前記第4のトランジスタのベースに接続されるダイオードであって、前記検出コイルに生じる誘導起電力によって逆方向電圧がかけられた状態において前記第4のトランジスタがオンになるように、且つ、前記検出コイルの誘導起電力によって順方向電圧がかけられた状態においては前記第4のトランジスタがオフになるように、前記第4のトランジスタのベース電流を制御調整する第2のダイオードと、を備えることを特徴とするブラシレスDCモータ駆動回路。
前記検出コイルに誘導起電力が生じていない状態において、前記駆動コイルに駆動電流が流れるように各素子定数が定められていることを特徴とする構成1又は構成4に記載のブラシレスDCモータ駆動回路。
前記第1のベース電流制限用抵抗と前記第2のベース電流制限用抵抗の抵抗値に差をつけることにより、又は、前記第1の直流電源の電源電圧と前記第2の直流電源の電源電圧との間に差をつけることにより、前記駆動コイルに駆動電流が流れるようにしたことを特徴とする構成5に記載のブラシレスDCモータ駆動回路。
前記回転子と、空芯コイルで構成された前記検出コイル及び前記駆動コイルと、当該検出コイル及び駆動コイルを、略同一平面上に、各空芯コイルの有効線輪面と前記回転子に備えられる複数の前記永久磁石の磁極とが空隙を有して対向するように配設させる固定子と、構成1乃至構成6の何れか1つに記載のブラシレスDCモータ駆動回路と、を備えることを特徴とするアキシャルギャップ型ブラシレスDCモータ。
外周面に前記永久磁石がN極S極交互に配される回転子と、当該回転子の永久磁石と空隙を有して対向して設けられる固定ヨークであって、内周面に形成される複数の凸状のコアに、前記検出コイルと、前記駆動コイルが巻きつけられて設けられた固定ヨークと、構成1乃至構成6の何れか1つに記載のブラシレスDCモータ駆動回路と、を備えることを特徴とするラジアルギャップ型ブラシレスDCモータ。
また、負荷の軽重(慣性モーメントの大小)等に応じて回路構成を変更(調整)しなければならないものではないため、汎用的に使用することができる。
図1は、本実施形態のブラシレスDCモータ駆動回路1を示す回路図である。実施形態1のブラシレスDCモータ駆動回路1は、検出コイルと駆動コイルとが固定される固定子と、これに対向する位置に配される永久磁石を備え、回動自在に軸支される回転子と、を有するブラシレスDCモータを駆動するための回路である。
ここで、「トランジスタ14のベース・エミッタ間の電流と並走順方向に接続されたダイオード16」とは、ベース・エミッタ間に並列に接続されるダイオード16が、ベース・エミッタ間の電流方向(順方向)と並行な電流方向に対して、順方向に設けられるということである。実施形態1においては、ダイオード16のアノードがトランジスタ14のベースに接続され、ダイオード16のカソードが検出コイル15の一端と接続され、当該検出コイル15の他端がトランジスタ14のエミッタに接続される。
なお、実施形態1のブラシレスDCモータ駆動回路1には、トランジスタ13のベースとトランジスタ14のコレクタ間に接続される電流制限用抵抗18と、直流電源12と駆動コイル11との間に設けられるスイッチ19と、をさらに有している。抵抗18は、トランジスタ14のコレクタ電流(トランジスタ13のベース電流)を制限するための抵抗である。
「検出コイル15に生じる誘導起電力」とは、回転子の回転に伴い、回転子に備えられる永久磁石が検出コイル15に接近又は遠ざかることによって生じる起電力である。即ち、検出コイル15は、回転子の回転状態を検出する(回転位置や回転速度に応じた起電力が発生する)ものである。本発明に係るブラシレスDCモータ駆動回路は、この検出コイルに生じる誘導起電力を、駆動コイルへの通電制御に使っているものである。
なお、本明細書における「トランジスタのしきい値」とは、トランジスタをオン動作とみなせるVBEの限界値である。 例えば、あるトランジスタのベース・エミッタ電圧とコレクタ電流の関係が、VBEが0.5Vの際にコレクタ電流が80μA流れるものであった場合、トランジスタ14としてこのトランジスタを使用した場合、トランジスタ13に電流増幅率200のものを使えば、トランジスタ13のコレクタ電流は16mAとなり、十分に飽和状態でのスイッチングが出来る。一方、同トランジスタのVBEが0.4Vでのコレクタ電流が6μAであった場合、この際にはトランジスタ13はオフ状態となる。即ち、このトランジスタにおける本明細書でいうところの「トランジスタのしきい値」は、0.4Vより大きく0.5V前後と言えるものである。しかし、トランジスタのしきい値は周囲温度により変化し、前記ダイオードの順電圧しきい値により、周囲温度に対応したトランジスタのベース電圧を得ることが出来る。
なお、「コイルの有効線輪面」とは、コイルに電流が流れている際に永久磁石102の磁極と対向することによって、回転子に回転力を与え得るコイルの範囲を示すものである。即ち、図2において、回転軸の同心円の法線方向に概ね沿った方向となるコイルの部分を示すものである。
これにより、駆動コイル11の各「有効線輪面」に流れる電流と、これに対向して停止している永久磁石102の磁力線との間におけるフレミングの法則により、永久磁石102に電磁力が作用し、停止していた位置から回転移動(例えば、永久磁石のN磁極が、隣の駆動コイル11の方に向かって移動)を開始する。そして、小磁石101と向き会っていた永久磁石102のN磁極が、図2の状態Bで示した、電磁力による回転力の発生しない位置にくるまで(ここの例では、回転子の回転角度が30度に達するまで)、図2の下のグラフで示されるごとく、駆動コイル11に駆動電流が供給され、確実に永久磁石102の回転移動を加速させる。
なお、図3(b)のグラフで、駆動電流が飽和電流値から下に垂れ下がる曲線があるが、これは駆動コイル11に発生する逆起電力により、駆動電流が減少したからであり、回転子の回転速度の上昇により、逆起電力による電流減少が大きくなることを示している(これにより、モータとしての消費電力が小さく抑えられる)。
例えば図2(a)でDの位置に到達した時のように、起動時のような検出コイル15に誘導起電力が発生していない時と同等な入力状態の時、トランジスタ14のベースへの逆方向電圧が無くなった時にトランジスタ14をオンにするスイッチングが可能となる。即ち、検出コイル15に生じる誘導起電力の負から正(トランジスタ14のベース逆電圧から順電圧)への転換点(例えば前記D位置)において、オンのスイッチングをし、また、検出コイル15に発生した誘導起電力の方向が正から負になった時点(例えばB位置)以後において、トランジスタ14のVBEは、0.4V以下の電圧となり、ベース電流を止めるため、トランジスタ14のオフへのスイッチングが行われる。これにより、高い応答性で、且つ、消費電力も極小化された駆動回路を得ることができる。 なお、トランジスタのしきい値を“僅かに上回る”の具体的値は、各製品の設計思想に基づいて適宜定められるものである。
また、負荷の軽重(慣性モーメントの大小)に応じて回路構成を変更(調整)しなければならないものではないため、汎用的に使用することができる。
また、検出コイルに誘導起電力が発生しても、ダイオード16と、トランジスタ14のベース逆電流阻止機能により、検出コイル15に電流が流れないため、各永久磁石に働く制動の電磁力を無くし、効率を向上させる効果がある。
図5は、実施形態2のブラシレスDCモータ駆動回路を示す回路図である。
その後は、図6に示したごとく、検出コイル15の起電力の変化に伴う2石のトランジスタ14と24のベース電圧推移(図6(a)、(b))に同調して図6(c)ように駆動コイル11の双方向スイッチング通電が連続的に生じ、その双方向通電により励磁された駆動コイル11の磁極と回転子の永久磁石磁極との電磁力により、回転子が加速され、回転する。
図7(a)は、上側回路の直流電源12において、コンデンサ122とダイオード123によって構成されるチャージポンプ回路を追加している。これにより連動スイッチ19のオン時に、上側回路の電源電圧が昇圧され、起動時には上側回路がオンとなるものである。なお、電流制限用抵抗18をトランジスタ14とトランジスタ24のエミッタ接続点と、直流電源12と22との間(基準電位)に接続することで、共通化している。
図7(b)では、直流電源12と22をそれぞれ、太陽電池123、223とコンデンサ124、224によって構成し、上側回路の太陽電池123の電圧を、下側回路の太陽電池223より高くしている。図7(b)の例では、電源スイッチを設けない構成としているため、例えば、夜間停止している状態から、室内が明るくなった際にその光を受けることによって自動起動するようにすることができる。
なお、「直流電源」とは、例えば、図7(c)に示されるように、交流電源を整流することによって構成されるものであってもよい。これにおいても、例えば、交流電源Pから電源を供給される二次側コイルの巻線量を上側と下側で変えることにより、意図した回転方向で自己起動させるようにしてもよい。
図9は、実施形態3のターンテーブルを示す一部分解斜視図である。ターンテーブル100は、図7(b)の駆動回路によって駆動されるアキシャルギャップ型のブラシレスDCモータ50を備えるものである。太陽電池123、223に光があたるとテーブル31が回転するものであり、例えば、店頭広告用に、テーブル31上に置かれた商品を回転展示するものである。筺体32には、アキシャルギャップ型のブラシレスDCモータ50が備えられると共に、太陽電池123、223との接続線や、適当なギア比を有する動力伝達機構、テーブル31の回転軸やその軸受などの各構成が納められる。
図10(a)に示されるように、モータ50は、大まかには、上側回転子ブロック51と、固定子ブロック52と、下側回転子ブロック53との、3つのブロックで構成される。
検出コイル15及び駆動コイル11は空芯コイルで構成され、本実施形態では駆動コイルを3つとしている。図10(a)に示されるように、検出コイル15及び3つの駆動コイル11はプリント基板521上において略同一平面上に等間隔に配置される。
一体化した各ブロックは、これを収納する筺体(上側筺体55、下側筺体56)に納められて組み付けされる。
上側筺体55の、四角柱513を納める部分には円筒状の円筒部が形成され、その外周に切り替えスイッチ機構54が取り付けられることで、モータ50が構成される。
図(a)の停止状態において、レバー541を操作して図(b)の位置にすると、各ゴム磁石515と各小磁石542の反発力によって、回転子が図(c)の状態となる。この位置の場合、各有効線輪面に各希土類磁石102が対向しないように規制されるため、電源供給があっても自己起動はしない。
さらにレバー541を操作して図(d)の位置にすると、図(a)とは磁極が逆の配置とされるため、電源供給があると、図(a)とは逆方向に回転起動するものである。
これを本実施形態のアキシャルギャップ型のブラシレスDCモータに適用する場合には、図10(a)を参照して、各コイルが取り付けられたプリント基板521と同様のもの(A相のコイルに対して22.5°ずらしてあるもの)をB相用としてもう一つ用意する。そしてA相用の各コイルが取り付けられたプリント基板と、B相用の各コイルが取り付けられたプリント基板を、A相、B相の各コイル同士を密着して重ねるようにしながら(当然であるがA相、B相の各コイル同士は電気的に非接続)、上側筺体55、下側筺体56により挟んで配置する。さらに、上側回転子ブロック51と下側回転子ブロック53に、A相用とB相用のずらし重なった各コイルの有効線輪面と対向するように、ヨークに固着された上下8個ずつの希土類磁石を設置する。
これにより、2相駆動によるパワフルで安定した駆動が可能となる。また、各コイルに貫通する磁束密度を上げる構成にしているため、電磁駆動力を増加させる効果がある。また、ステータヨークによる鉄損や渦電流損失が無くなり、軸受部に掛かる過大荷重による摩擦損をなくすことにより、小電力の高効率モータとすることの出来る効果がある。
固定ヨーク62の内周面には、複数の凸状のコア621が形成され、このコア621には検出コイル15と、駆動コイル11が巻きつけられて設けられる。各コア621の間隔は、これに設けられる各コイルの有効線輪面が永久磁石102と対向する位置となるように定められる。
図14の例では、例えば図13の駆動回路によって駆動される2相のラジアル型モータを示しており、図14における左側がA相、右側がB相となる。A相の各コイル(1つの検出コイル15a及び複数の駆動コイル11a)の有効線輪面が永久磁石102と対向している状態(最大の回転力が得られる状態)においては、B相は各コイル(1つの検出コイル15b及び複数の駆動コイル11b)の有効線輪面と各永久磁石同士の境界が対向している状態(回転力最小)となる。
Claims (2)
- 回転子に備えられる永久磁石の磁界内に配される駆動コイルと、
前記駆動コイルに駆動電力を供給する直流電源と、
エミッタ接地で、コレクタが前記駆動コイルに接続された第1のトランジスタと、
エミッタ接地で、コレクタが前記第1のトランジスタのベースに接続された第2のトランジスタと、
前記第2のトランジスタのベース電流を調整するベース電流制限用抵抗と、
前記永久磁石の磁界内に配される検出コイルであって、前記第2のトランジスタのベース・エミッタ間に設けられる検出コイルと、
前記第2のトランジスタのベース・エミッタ間に、前記検出コイルと直列に接続され、前記第2のトランジスタのベース・エミッタ間の電流と並走順方向に設けられるダイオードであって、前記検出コイルに生じる誘導起電力によって逆方向電圧がかけられた状態において前記第2のトランジスタがオンになるように、且つ、前記検出コイルの誘導起電力によって順方向電圧がかけられた状態においては前記第2のトランジスタがオフになるように、前記第2のトランジスタのベース電流を制御調整するダイオードと、
を備えることを特徴とするブラシレスDCモータ駆動回路。 - 直列に接続される第1の直流電源及び第2の直流電源と、
回転子に備えられる永久磁石の磁界内に配され、前記第1の直流電源と第2の直流電源の間にその一端を接続された駆動コイルと、
PNP型トランジスタであって、エミッタが前記第1の直流電源の正極側に接続され、コレクタが前記駆動コイルの他端に接続される第1のトランジスタと、
NPN型トランジスタであって、エミッタが前記第1の直流電源と第2の直流電源の間に接続され、コレクタが前記第1のトランジスタのベースに接続された第2のトランジスタと、
前記第2のトランジスタのベース電流を調整する第1のベース電流制限用抵抗と、
前記永久磁石の磁界内に配される検出コイルであって、前記第2のトランジスタのベース・エミッタ間に設けられる検出コイルと、
アノードが前記第2のトランジスタのベースに接続され、カソードが前記検出コイルに接続されるダイオードであって、前記検出コイルに生じる誘導起電力によって逆方向電圧がかけられた状態において前記第2のトランジスタがオンになるように、且つ、前記検出コイルの誘導起電力によって順方向電圧がかけられた状態においては前記第2のトランジスタがオフになるように、前記第2のトランジスタのベース電流を制御調整する第1のダイオードと、
NPN型トランジスタであって、エミッタが前記第2の直流電源の負極側に接続され、コレクタが前記駆動コイルの他端に接続される第3のトランジスタと、
PNP型トランジスタであって、エミッタが前記第1の直流電源と第2の直流電源の間に接続され、コレクタが前記第3のトランジスタのベースに接続された第4のトランジスタと、
前記第4のトランジスタのベース電流を調整する第2のベース電流制限用抵抗と、
アノードが前記検出コイル及び前記第1のダイオードのカソードに接続され、カソードが前記第4のトランジスタのベースに接続されるダイオードであって、前記検出コイルに生じる誘導起電力によって逆方向電圧がかけられた状態において前記第4のトランジスタがオンになるように、且つ、前記検出コイルの誘導起電力によって順方向電圧がかけられた状態においては前記第4のトランジスタがオフになるように、前記第4のトランジスタのベース電流を制御調整する第2のダイオードと、
を備えることを特徴とするブラシレスDCモータ駆動回路。
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KR1020147016794A KR101590284B1 (ko) | 2014-04-15 | 2014-04-15 | 브러시리스 dc 모터의 구동 회로 |
US14/368,881 US9641109B2 (en) | 2014-04-15 | 2014-04-15 | Drive circuit for brushless DC motor |
PCT/JP2014/060680 WO2015159358A1 (ja) | 2014-04-15 | 2014-04-15 | ブラシレスdcモータの駆動回路 |
CN201480000477.8A CN105612691B (zh) | 2014-04-15 | 2014-04-15 | 无刷直流电动机的驱动电路 |
JP2014534840A JP5778349B1 (ja) | 2014-04-15 | 2014-04-15 | ブラシレスdcモータの駆動回路 |
EP14731896.8A EP2955840A1 (en) | 2014-04-15 | 2014-04-15 | Drive circuit for brushless dc motor |
TW103122401A TWI514748B (zh) | 2014-04-15 | 2014-06-27 | Brushless DC motor drive circuit |
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US11845575B2 (en) * | 2017-03-31 | 2023-12-19 | Ihi Aerospace Co., Ltd. | Docking device |
CN108696057B (zh) * | 2017-04-12 | 2021-06-25 | 德昌电机(深圳)有限公司 | 电机及具有该电机的用电设备 |
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TWI703797B (zh) * | 2018-09-28 | 2020-09-01 | 黃柏原 | 一種可蓄電無刷直流馬達電路裝置 |
KR102362137B1 (ko) * | 2019-10-30 | 2022-02-11 | 주식회사다스 | Bldc 모터 시스템 및 구동 장치 |
TW202203586A (zh) * | 2020-03-02 | 2022-01-16 | 美商飛爾康動力公司 | 用於可變轉矩發電機/馬達齒輪切換的級聯mosfet設計 |
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WO2023227866A1 (en) * | 2022-05-23 | 2023-11-30 | Reckitt & Colman (Overseas) Hygiene Home Limited | Fan for an automatic dispensing device |
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CN105612691A (zh) | 2016-05-25 |
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US20160301339A1 (en) | 2016-10-13 |
CN105612691B (zh) | 2017-12-19 |
JPWO2015159358A1 (ja) | 2017-04-13 |
TWI514748B (zh) | 2015-12-21 |
US9641109B2 (en) | 2017-05-02 |
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KR20150134256A (ko) | 2015-12-01 |
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