WO2015025749A1 - Moteur - Google Patents

Moteur Download PDF

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Publication number
WO2015025749A1
WO2015025749A1 PCT/JP2014/071127 JP2014071127W WO2015025749A1 WO 2015025749 A1 WO2015025749 A1 WO 2015025749A1 JP 2014071127 W JP2014071127 W JP 2014071127W WO 2015025749 A1 WO2015025749 A1 WO 2015025749A1
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WO
WIPO (PCT)
Prior art keywords
motor
duty ratio
rotation speed
rotating
rotation
Prior art date
Application number
PCT/JP2014/071127
Other languages
English (en)
Japanese (ja)
Inventor
清水　大介
伸光 千代松
Original Assignee
日本電産株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産株式会社 filed Critical 日本電産株式会社
Priority to CN201480041394.3A priority Critical patent/CN105408074B/zh
Publication of WO2015025749A1 publication Critical patent/WO2015025749A1/fr

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Classifications

    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
    • H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/26—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
    • B26D1/28—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting
    • B26D1/29—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting with cutting member mounted in the plane of a rotating disc, e.g. for slicing beans
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/02—Means for moving the cutting member into its operative position for cutting
    • B26D5/06—Means for moving the cutting member into its operative position for cutting by electrical means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

  • the present invention relates to a motor for driving a blade.
  • the present invention aims to automatically control the rotation speed by using a brushless DC motor in an apparatus for driving a blade.
  • An example of the invention of the present application is a brushless DC motor for cutting or scraping an object by rotating a blade, the shaft rotating the blade when the brushless DC motor is driven, and the brushless DC motor Drive means for driving the motor by PWM control, rotation detection means for detecting rotation and outputting a rotation detection signal, and rotation speed determination means for calculating the rotation detection signal and determining the rotation speed.
  • the number determining means includes a lower limit rotational speed determining means for determining whether the brushless DC motor is loaded and the rotational speed is lower than a lower limit rotational speed, and an output means for outputting a result of the rotational speed determining means, In the case where the motor is driven at a predetermined duty ratio by the driving means, the driving means outputs a signal that the rotational speed discrimination means falls below the lower limit rotational speed And setting the first DUTY ratio larger than the predetermined DUTY ratio.
  • An example of the invention of the present application is a brushless DC motor for cutting or scraping an object by rotating a cutter, the shaft rotating the cutter when the brushless DC motor is driven, and the brushless Driving means for driving the DC motor by PWM control, rotational load detection means for detecting a rotational load and outputting a rotational load detection signal, rotational load determination means for calculating the rotational load detection signal and determining the rotational load
  • the rotational load determination means includes: predetermined rotational load determination means for determining whether the rotational load exceeds a predetermined rotational load; and output means for outputting a result of the rotational load determination means.
  • the driving means determines that the rotational load determining means is higher than the predetermined rotational load.
  • the first duty ratio is set to a value larger than the predetermined duty ratio.
  • the power consumption of the apparatus can be reduced by performing control to change the rotation speed or torque according to the load of the object to be cut.
  • FIG. 1 is an external perspective view of a motor according to the present invention.
  • FIG. 2 is a cross-sectional view of a motor according to the present invention.
  • FIG. 3 is a schematic diagram of a food processor equipped with the motor of the present invention.
  • FIG. 4 is a schematic view of a lawn mower equipped with the motor of the present invention.
  • FIG. 5 is a flow diagram illustrating one embodiment of the present invention.
  • FIG. 6 is a flow diagram illustrating one embodiment of the present invention.
  • FIG. 1 in the direction of the central axis of the motor is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”.
  • the vertical direction does not indicate the positional relationship or direction when incorporated in an actual device.
  • a direction parallel to the central axis is referred to as an “axial direction”
  • a radial direction centered on the central axis is simply referred to as “radial direction”
  • a circumferential direction centered on the central axis is simply referred to as “circumferential direction”.
  • the motor of the present embodiment is used as a drive source for rotating tools such as stick blenders, handy blenders, mixers, food processors, etc., farm tools such as lawn mowers, mowers, and other blades. Is done.
  • a device on which the motor 1 is mounted is referred to as a “drive device”.
  • FIG. 1 is an external perspective view of a motor 1 according to the present embodiment.
  • FIG. 2 is a cross-sectional view of the motor 1.
  • the motor 1 includes a stationary part 2 and a rotating part 3.
  • the stationary part 2 is fixed to a frame of a driving device (not shown).
  • the rotating unit 3 is supported so as to be rotatable with respect to the stationary unit 2.
  • the stationary portion 2 of the present embodiment includes an upper bracket 21, a lower bracket 22, a stator core 23, a coil 24, an upper insulator 25, a lower insulator 26, a circuit board 27, and a bearing portion 28.
  • the upper bracket 21 holds the stator core 23 and the bearing portion 28 (upper bearing 281). More specifically, the upper bracket 21 comes into contact with the circuit board 27 and is fixed to the lower bracket 22 by a plurality of fixing members 61, thereby sandwiching and holding the stator core 23.
  • the upper bracket 21 has a substantially cylindrical shape with a lid.
  • the upper bracket 21 is a metal member.
  • the upper bracket 21 is obtained by a so-called die casting method in which a metal containing zinc as a main component is melted and poured into a mold. In addition, the kind of metal is not restricted to zinc, You may use aluminum and other metals. Further, the manufacturing method may be processed by other processing methods such as a press method instead of the die casting method.
  • the upper bracket 21 may be made of resin instead of metal.
  • the lower bracket 22 holds the stator core 23 and the bearing portion 28 (lower bearing 282).
  • the lower bracket 22 has a substantially cylindrical shape with a bottom.
  • the lower bracket 22 is a metal member.
  • the lower lid 221 is provided with a plurality of holes in the circumferential direction (not shown). By inserting a screw into the hole, the motor 1 and the driving device are fixed.
  • the lower bracket 22 is obtained by a so-called die casting method in which a metal containing zinc as a main component is melted and poured into a mold.
  • the kind of metal is not restricted to zinc, You may use aluminum and other metals.
  • the manufacturing method may be processed by other processing methods such as a press method instead of the die casting method.
  • the upper bracket 21 may be made of resin instead of metal.
  • the stator core 23 and the bearing part 28 (lower bearing 282) are hold
  • the stator core 23 and the coil 24 are parts that function as an armature of the motor 1.
  • the stator core 23 is made of a laminated steel plate in which electromagnetic steel plates such as silicon steel plates are laminated in the axial direction (direction along the central axis J1, hereinafter the same).
  • the stator core 23 has an annular core back 231 and a plurality of magnetic pole teeth 232 protruding from the core back 231 toward the inside in the radial direction.
  • the core back 231 is held by being sandwiched between the upper bracket 21 and the lower bracket 22.
  • the outer peripheral surface of the core back 231 becomes the outer peripheral surface of the motor 1 except for the upper part in the axial direction and the lower part in the axial direction.
  • the circumferential width of the portion around which the coil 24 of each magnetic pole tooth 232 of the stator core 23 is wound is not more than twice the radial width of the core back 231. In the present embodiment, the number of magnetic pole teeth 232 is six.
  • the outer peripheral surface of the stator core 23 is not covered with the lower bracket 22 and the upper bracket 21 except for the vicinity of the upper end and the vicinity of the lower end, and is exposed from the lower bracket 22 and the upper bracket 21. That is, compared with the case where the entire outer peripheral surface of the stator core 23 is covered with the lower bracket 22 and the upper bracket 21, in the present embodiment, the radial facing area between the outer peripheral surface of the stator core 23 and the lower bracket 22 and the upper bracket 21 is smaller. small. For this reason, even if the lower bracket 22 and the upper bracket 21 are magnetic bodies, magnetic flux leakage from the outer peripheral surface of the stator core 23 to the lower bracket 22 and the upper bracket 21 hardly occurs. Therefore, iron loss due to the lower bracket 22 and the upper bracket 21 can be reduced, and the energy efficiency of the motor 1 can be improved.
  • Through holes 233 are formed at boundaries between several core backs 231 and magnetic pole teeth 232 of the stator core 23.
  • the number of through holes 233 is three.
  • the through holes 233 are desirably arranged at equal intervals in the circumferential direction around the central axis.
  • the through holes 233 are arranged with an interval of 120 degrees when viewed from the central axis.
  • the through hole 233 is not limited to this, and may be a groove recessed inward in the radial direction.
  • a fixing member 61 described later passes through the through hole 233.
  • a longitudinal groove 234 extending in the axial direction is formed on the outer peripheral surface of the stator core 23.
  • the protrusion 216 of the upper bracket 21 and the protrusion 228 of the lower bracket 22 are inserted or fitted into the vertical groove 234.
  • the upper bracket 21 and the lower bracket 22 are positioned in the radial direction and the circumferential direction.
  • the coil 24 is composed of a conductive wire wound around the magnetic pole teeth 232.
  • the coil 24 is wound around the magnetic pole teeth 232 via an insulator.
  • the conducting wire is connected by so-called star connection. Therefore, four ends of the U phase, the V phase, the W phase, and the common are drawn out from the coil 24. Each drawn end is soldered to the circuit board 27.
  • a drive current is applied to the coil 24 via the circuit board 27, a magnetic flux in the radial direction is generated in the magnetic pole teeth 232 that are the magnetic core.
  • circumferential torque is generated by the action of the magnetic flux between the magnetic pole teeth 232 and the rotor magnet 33 on the rotating unit 3 side.
  • the rotating unit 3 rotates about the central axis J1 with respect to the stationary unit 2.
  • the upper insulator 25 and the lower insulator 26 are resin members that electrically insulate the stator core 23 and the coil 24 from each other.
  • the upper insulator 25 is disposed on the upper side of the stator core 23.
  • the lower insulator 26 is disposed below the stator core 23. In other words, the stator core 23 is sandwiched between the upper insulator 25 and the lower insulator 26.
  • the upper insulator 25 covers the upper surface of the magnetic pole teeth 232.
  • the lower insulator 26 covers the lower surface of the magnetic pole teeth 232.
  • the upper insulator 25 and the lower insulator 26 cover the side surfaces of the magnetic pole teeth 232.
  • the upper insulator 25 and the lower insulator 26 constitute an insulator.
  • the coil 24 is wound around the magnetic pole teeth 232 from above the upper insulator 25 and the lower insulator 26, so that the insulator is fixed to the stator core 23.
  • the upper insulator 25 and the lower insulator 26 are interposed between the magnetic pole teeth 232 and the coil 24 and have portions that electrically insulate the magnetic pole teeth 232 and the coil 24 from each other. Further, the upper insulator 25 has an annular core back insulating portion 252 that is continuous in the circumferential direction outside the coil 24 in the radial direction. The core back insulating part 252 is disposed on the radially outer side of the coil 24. The core back insulating part 252 is a part that insulates from other members when the coil 24 collapses.
  • An assembly of the stator core 23, the coil 24, the upper insulator 25, and the lower insulator 26 is defined as an armature 29.
  • the circuit board 27 is a board having wiring for applying a driving current to the coil 24 from an external power source.
  • the circuit board 27 has a substantially disk shape in plan view.
  • the outer shape of the circuit board 27 substantially matches the outer shape of the upper insulator 25 described later.
  • the circuit board 27 is fixed on a seating surface 2531 that is an upper surface of the upper insulator 25.
  • a magnetic sensor 271 for detecting the number of rotations of the rotating unit 3 is provided on the lower surface of the circuit board 27.
  • a Hall element is used for the magnetic sensor 271.
  • an encoder may be mounted instead of the Hall element or in addition to the Hall element. From the viewpoint of accuracy of rotation detection, the encoder can obtain higher accuracy.
  • the bearing portion 28 is a member that rotatably supports the shaft 31 of the rotating portion 3.
  • the bearing portion 28 includes an upper bearing 281 and a lower bearing 282.
  • the upper bearing 281 is held on the inner peripheral surface 2121 of the holding portion 212 of the upper bracket 21.
  • the lower bearing 282 is held by the lower bracket 22.
  • a ball bearing that relatively rotates an outer ring and an inner ring via a sphere is used.
  • another type of bearing such as a slide bearing or a fluid bearing may be used for the bearing portion 28.
  • the rotating unit 3 of the present embodiment includes a shaft 31, a rotor holder 32, and a rotor magnet 33.
  • the shaft 31 is a substantially cylindrical member extending in the vertical direction along the central axis J1.
  • the shaft 31 rotates about the central axis J1 while being supported by the bearing portion 28 described above.
  • the lower end portion of the shaft 31 protrudes downward from the lower bracket 22.
  • the upper end portion of the shaft 31 protrudes above the circuit board 27.
  • a lower end portion or an upper end portion of the shaft 31 is connected to a drive unit of the drive device via a power transmission mechanism such as a gear.
  • the drive unit of the drive device may be directly driven by the shaft 31.
  • the rotor holder 32 is a member that rotates together with the shaft 31 on the radially inner side of the stator core 23 and the coil 24.
  • the rotor holder 32 of the present embodiment is made of free-cutting steel.
  • the rotor holder 32 is formed by cutting.
  • the rotor holder 32 has a substantially H-shaped cross section, and has a central part 321 and a cylindrical part 322.
  • the central portion 321 is located in the center of the rotor holder 32 in the axial direction, and the shaft 31 is press-fitted into the inner peripheral surface thereof.
  • the cylindrical portion 322 is a substantially cylindrical portion that is located on the radially outer side of the central portion 321 and extends to the upper side and the lower side of the central portion 321 in the axial direction.
  • the shape of the rotor holder 32 is substantially H-shaped in cross section, but is not limited thereto.
  • the shape of the rotor holder 32 may be a simple cylindrical shape.
  • the shape of the rotor holder 32 may be a substantially cylindrical shape with a lid, and may be obtained by pressing. Moreover, you may obtain the rotor holder 32 by laminating
  • a so-called SPM type Surface-permanent magnet
  • the rotor may be a so-called IPM type (Interior permanent-magnet, embedded magnet type).
  • IPM type Interior permanent-magnet, embedded magnet type
  • the rotor holder 32 is preferably obtained by laminating magnetic steel plates.
  • the rotor magnet 33 has a cylindrical shape and is fixed to the outer peripheral surface of the cylindrical portion 322 of the rotor holder 32.
  • the radially outer surface of the rotor magnet 33 is a magnetic pole surface that faces the stator core 23 and the coil 24 in the radial direction.
  • the rotor magnet 33 is magnetized so that the N-pole magnetic pole surface and the S-pole magnetic pole surface are alternately arranged in the circumferential direction.
  • position a several magnet so that a north-pole and a south pole may be located in a line by the circumferential direction.
  • an IPM type rotor may be used, and the rotor magnet 33 may be embedded in the rotor holder 32.
  • the food processor 41 will be described below as an example of a driving device.
  • the food processor 41 includes a base 411, an operation unit 412, and a cooking unit 413.
  • the motor 1 is accommodated in the base 411.
  • the shaft 31 of the motor 1 extends toward the cooking unit 413 side.
  • the operation unit 412 has a plurality of switches for the user to operate.
  • the cooking unit 413 includes a container unit 4131 and a blade 4132.
  • the container portion 4131 is a cup-shaped member having an openable / closable lid and a handle.
  • a user can put vegetables such as tomatoes and potatoes, fruits such as oranges, and other ingredients.
  • the blade 4132 is driven by the shaft 31 of the motor 1. When the shaft 31 rotates, the blade 4132 rotates and the food material is cut. Thereby, a foodstuff can be cooked.
  • lawn mower 51 includes a handle portion 511, a hook portion 512, a battery portion 513, and a drive portion 514.
  • the handle part 511 is provided in two places.
  • the handle portion 511 is a part that can be gripped by an operator when the lawn mower 51 is used.
  • the handle portion 511 is provided with an operation portion 5111 for an operator to operate the lawn mower 51.
  • the collar portion 512 is a rod-shaped portion, and connects the handle portion 511, the battery portion 513, and the drive portion 514.
  • the battery part 513 is located at one end of the flange part 512.
  • the battery portion 513 includes a battery 5131 and a terminal portion 5132 to which the battery 5131 is connected.
  • the battery 5131 supplies power to the motor 1.
  • the battery unit 513 is located behind the worker when the battery unit 513 is in use by the worker.
  • the drive part 514 is located at the other end side end part of the collar part 512.
  • the drive unit 514 includes the motor 1, a speed reduction mechanism 5141, and a blade 5142.
  • the speed reduction mechanism 5141 includes a multi-stage gear and meshes with a gear disposed at the tip of the shaft 31.
  • the blade 5142 is a disk-shaped part, and has a blade on the outer peripheral surface. By rotating the blade 5142, when the turf hits the blade 5142, the turf can be cut. As a result, the lawn can be mowed.
  • ⁇ Circuit configuration> An outline of a motor and a device for driving the blade will be described.
  • a voltage is applied to the control microcomputer and the motor drive circuit by the AC-DC power supply circuit or the DC-DC power supply circuit.
  • PWM control is performed by the control microcomputer, and the motor drive circuit is instructed to the control microcomputer by the duty ratio.
  • the motor drive circuit controls the drive of the motor according to the given duty ratio.
  • the drive means is realized by a control microcomputer and a motor drive circuit.
  • the control microcomputer may include any one of a rotation speed determination unit, a rotation load determination unit, and a rotation load detection unit.
  • the rotation detection means may be realized by a control microcomputer, or may be realized by an encoder or a hall element.
  • the control microcomputer, encoder, and hall element may be mounted on the motor or attached to the apparatus.
  • FIG. 5 is a flowchart showing an operation procedure according to an exemplary embodiment of the present invention.
  • the operation of the embodiment when the rotation detection means is realized by an encoder will be described below.
  • the motor is driven at a predetermined duty ratio of 10% by PWM control (S1).
  • PWM control PWM control
  • the rotational speed of the motor is a predetermined rotational speed.
  • the duty ratio by the PWM control is still 10%.
  • the rotation detection signal is formed by a pulse signal generated from an encoder.
  • the rotational speed discrimination means calculates the rotational speed.
  • the control microcomputer has a rotation speed determination means, and the rotation speed determination means calculates the rotation speed by counting the number of pulse signals within a predetermined time.
  • the motor rotation number exceeds the lower limit rotation number that is, the case where the count number of pulse signals within a predetermined time exceeds the lower limit number
  • tomato corresponds to this.
  • the lawn which is easy to cut corresponds to this.
  • the cutter is rotated without changing the duty ratio and with the rotational speed falling below the predetermined rotational speed (S10). Then, when the processing of the object is completed, the blade is not loaded, and thus returns to a predetermined rotational speed. With this control, unnecessary PWM control can be eliminated and the blade can be driven at the minimum number of rotations, so that the power consumption of the apparatus can be suppressed.
  • the drive control means increases the rotational speed by changing to the first duty ratio so that the object can be processed.
  • the first duty ratio at this time is set to 50% (S11). That is, the driving means sets the first duty ratio having a value larger than a predetermined duty ratio when the rotational speed discrimination means outputs a signal lower than the lower limit rotational speed.
  • the rotation determination unit again calculates the count number of the pulse signal within a predetermined time.
  • the rotation speed discrimination means outputs that the rotation speed has fallen below the lower limit speed.
  • the drive control means sets the second duty ratio that is larger than the first duty ratio.
  • the second duty ratio is set to 80% (S4).
  • the third duty ratio can be set by using the same rotational speed discriminating means.
  • the third duty ratio is set to 100% (S6).
  • the rotation speed suitable for processing an object varies depending on the hardness and viscosity of the object. For example, when the object is soft, it is not necessary to increase the number of rotations of the blade and can be processed. However, when the object is hard, it is necessary to increase the rotational speed of the blade. If a hard object is to be processed with a small number of revolutions, the blade will bite into the object or only be stroked. When the viscosity of the object is low, the load on the blade is small, so the number of rotations may remain small. On the other hand, when the viscosity of the object is high, the load on the blade increases, so the rotational speed needs to be increased.
  • the motor automatically selects a rotation speed suitable for processing the object. This is because the device for driving the blade can avoid unnecessary high-speed rotation, so that power consumption can be reduced.
  • the rotational speed determination means determines whether the rotational speed is below (S7).
  • the rotational speed determination means determines that the rotational speed is lower than the rotational speed, driving of the motor is stopped. That is, the drive means sets the duty ratio to 0%. At this time, an error may be notified in the apparatus.
  • This rotation speed control can prevent an excessive load from being applied to the motor and can prevent the motor from failing due to an overcurrent.
  • the duty ratio is set to any one of the first duty ratio, the second duty ratio, and the third duty ratio.
  • the cutter rotates, and the object starts to be processed, a load is applied to the cutter, and the rotational speed is equal to or less than the predetermined rotational speed.
  • the rotational speed exceeds the lower limit rotational speed.
  • the rotation speed determination means has a specified rotation speed determination means for determining whether the rotation speed exceeds the specified rotation speed.
  • the device that drives the blade can determine that the processing of the object has been completed and can automatically stop the rotation, so that the object can be processed fully automatically.
  • the load on the blade may be determined by calculating that there is no change in the number of pulses within a predetermined time by the rotation speed determination means.
  • the current value fluctuation value may be separately sensed and determined by not exceeding a predetermined rotational load.
  • the predetermined rotational speed, the lower limit rotational speed, and the specified rotational speed in the rotational speed discrimination means will be described.
  • the predetermined number of rotations means that the number of rotations driven by a predetermined duty ratio is a predetermined number of rotations.
  • the lower limit rotational speed is 70% or less as compared with a predetermined rotational speed. For example, when the object to be processed is soft, it can be processed even at a predetermined rotational speed. However, if the rotational speed is 70% or less in order to process the object, it is difficult to process the object with a predetermined duty ratio. Therefore, the lower limit rotational speed is set to 70% or less of the predetermined rotational speed, and when the rotational speed is lower than the lower limit rotational speed, the duty ratio is set to the first duty ratio, thereby enabling processing.
  • the specified rotation speed is 85% or more compared to the predetermined rotation speed. For example, when time elapses and the processing of the object is completed, the load on the blade is reduced. Therefore, it is not necessary to set the duty ratio to be equal to or higher than a predetermined duty ratio. That is, the end of processing can be determined by determining the rotation speed. Continued driving at a predetermined duty ratio or higher consumes unnecessary power. Therefore, unnecessary power consumption can be reduced by setting the specified rotational speed to 85% of the predetermined rotational speed and setting the duty ratio to the predetermined duty ratio when the specified rotational speed is exceeded.
  • a Hall element may be used as the rotation detecting means instead of the encoder. Since the Hall element is disposed on the circuit board of the motor, the space is saved, and the motor for driving the blade can be downsized.
  • FIG. 6 is a flowchart illustrating an operation procedure according to an exemplary embodiment of the present invention.
  • the rotational speed is controlled by determining the rotational load.
  • the driving means sets the first duty ratio having a value larger than the predetermined duty ratio.
  • a method for sensing the current value of the motor will be described as a method for determining the rotational load.
  • a predetermined rotational load is determined by providing a predetermined threshold value for the current value. When a load is generated on the blade and the object is processed, the current value increases. This increase is sensed to determine whether or not a predetermined threshold value is exceeded.
  • the setting of the current value threshold may be calculated from the absolute value of the current value.
  • a current value difference value at a predetermined duty ratio may be calculated from a current value when a load is generated, and a threshold value for the difference value may be provided.
  • a plurality of threshold values may be provided. For example, a first rotation load having a value larger than a predetermined rotation load may be provided, or a second rotation load having a value larger than the first rotation load may be provided.
  • the rotation speed discrimination means counts the pulse signal of the encoder within a predetermined time. After setting the duty ratio to the third duty ratio, if the rotational speed determination means determines that the rotational speed is below the lower limit rotational speed, the control microcomputer outputs a forward / reverse rotational signal to the motor. This reverse rotation control may be performed before error notification in the first preferred embodiment. Further, the drive means may not be after the duty ratio is set to the third duty ratio, but may be after the first duty ratio or the second duty ratio.
  • the rotational torque of the motor can be further improved by setting the rated rotation of the motor, that is, the rotation with no load as DUTY 10%. That is, when processing a hard material, the duty ratio may be increased. By increasing the duty ratio, by detecting the rotational speed, current value, and rotational load, it is possible to process the object with the optimum duty ratio.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Food-Manufacturing Devices (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Harvester Elements (AREA)

Abstract

La présente invention concerne un moteur à c.c. sans balai permettant de couper un objet à couper par rotation d'une lame, et qui comporte : un arbre destiné à faire tourner la lame lorsque le moteur à c.c. sans balai est entraîné ; un moyen d'entraînement pour entraîner le moteur à c.c. sans balai au moyen d'une commande MID ; un moyen de détection de rotation permettant de détecter la rotation et de délivrer en sortie un signal de détection de rotation ; et un moyen de détermination de vitesse de rotation permettant d'effectuer un traitement arithmétique sur le signal de détection de rotation et de déterminer la vitesse de rotation. Le moyen de détermination de vitesse de rotation comprend : un moyen de détermination de vitesse de rotation de limite inférieure permettant de déterminer si la vitesse de rotation devient inférieure à une vitesse de rotation de limite inférieure en raison d'une charge exercée sur le moteur à c.c. sans balai ; et un moyen de sortie permettant de délivrer en sortie le résultat du moyen de détermination de vitesse de rotation. Pendant que le moteur est entraîné à un rapport cyclique déterminé à l'aide du moyen d'entraînement, lorsque le moyen de détermination de vitesse de rotation délivre en sortie un signal indiquant que la vitesse de rotation devient inférieure à la vitesse de rotation de limite inférieure, le moyen d'entraînement établit le rapport cyclique à un premier rapport cyclique présentant une valeur supérieure au rapport cyclique déterminé.
PCT/JP2014/071127 2013-08-19 2014-08-09 Moteur WO2015025749A1 (fr)

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JP6486985B2 (ja) * 2017-04-03 2019-03-20 ミネベアミツミ株式会社 モータ駆動制御装置、モータ駆動制御方法及びチューブポンプ
DE102019211293A1 (de) * 2019-07-30 2021-02-04 BSH Hausgeräte GmbH Hausgerät mit einem automatisch einstellbaren Motor und Verfahren zum Betrieb eines Hausgeräts

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JPS60242815A (ja) * 1984-05-17 1985-12-02 松下電器産業株式会社 電動調理器
JP2012030323A (ja) * 2010-07-30 2012-02-16 Hitachi Koki Co Ltd 電動工具
WO2012108415A1 (fr) * 2011-02-10 2012-08-16 株式会社マキタ Outil électrique

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CN101098116B (zh) * 2006-06-30 2010-06-16 比亚迪股份有限公司 一种直流无刷电机的模拟无级调速方法
KR20080005776A (ko) * 2006-07-10 2008-01-15 삼성전자주식회사 비엘디씨 모터의 제어장치 및 그 제어방법
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JP5552701B2 (ja) * 2011-09-20 2014-07-16 日立オートモティブシステムズ株式会社 ブラシレスモータの駆動装置

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JPS60242815A (ja) * 1984-05-17 1985-12-02 松下電器産業株式会社 電動調理器
JP2012030323A (ja) * 2010-07-30 2012-02-16 Hitachi Koki Co Ltd 電動工具
WO2012108415A1 (fr) * 2011-02-10 2012-08-16 株式会社マキタ Outil électrique

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CN105408074B (zh) 2017-09-08

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