CN105408074A - Motor - Google Patents
Motor Download PDFInfo
- Publication number
- CN105408074A CN105408074A CN201480041394.3A CN201480041394A CN105408074A CN 105408074 A CN105408074 A CN 105408074A CN 201480041394 A CN201480041394 A CN 201480041394A CN 105408074 A CN105408074 A CN 105408074A
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- CN
- China
- Prior art keywords
- rotating speed
- motor
- judgement unit
- dutycycle
- brushless
- Prior art date
- Legal status (The legal status 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 status listed.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- 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
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- 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
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- 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
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Harvester Elements (AREA)
- Food-Manufacturing Devices (AREA)
Abstract
A brushless DC motor for cutting an object to be cut by rotating a blade has: a shaft for, when the brushless DC motor is driven, rotating the blade; a drive means for driving the brushless DC motor by a PWM control; a rotation detection means for detecting the rotation and outputting a rotation detection signal; and a rotation speed determination means for performing arithmetic processing on the rotation detection signal and determining the rotation speed. The rotation speed determination means comprises: a lower limit rotation speed determination means for determining whether or not the rotation speed becomes lower than a lower limit rotation speed because of a load imposed on the brushless DC motor; and an output means for outputting the result of the rotation speed determination means. While the motor is being driven at a predetermined duty ratio by the drive means, when the rotation speed determination means outputs a signal indicating that the rotation speed becomes lower than the lower limit rotation speed, the drive means sets the duty ratio to a first duty ratio having a value larger than the predetermined duty ratio.
Description
Technical field
The present invention relates to a kind of for driving the motor of cutter.
Background technology
In the past, there is the device of the driving cutter of the rotary speed control carrying out having divided constant level.These devices use induction motor mostly, and the rotary speed of being undertaken step by step by circuit structure is controlled.
Summary of the invention
Invent problem to be solved
But the device automatically adjusting rotary speed according to the target object cut off, pulverize is also few.
In the present invention, automatically to be controlled for the purpose of rotary speed by use brushless DC motor in the device driving cutter.
For solving the means of problem
Be a kind of for cutting or cut the brushless DC motor of target object by making cutter rotate at an example of the present patent application, it is characterized in that having: axle, it is made cutter rotate when described brushless DC motor drives; Driver element, it controls described brushless DC motor is driven by PWM; Rotary detecting circuit, its detection rotates and exports rotation detection signal; And rotating speed judgement unit, it calculates rotation detection signal and differentiates rotating speed, and described rotating speed judgement unit has: lower limit rotating speed judgement unit, and it differentiates described brushless DC motor applying load, and whether rotating speed is lower than lower limit rotating speed; And output unit, it exports the result of described rotating speed judgement unit, when being made described motor drive by appointment dutycycle by described driver element, when described rotating speed judgement unit outputs the signal lower than described lower limit rotating speed, the first dutycycle that described driver element setting value is larger than described appointment dutycycle.
Be a kind of for cutting or cut the brushless DC motor of target object by making cutter rotate at an example of the present patent application, it is characterized in that having: axle, it is made cutter rotate when described brushless DC motor drives; Driver element, it controls described brushless DC motor is driven by PWM; Rotary load detecting unit, it detects rotary load and exports rotary load detection signal; And rotary load judgement unit, it calculates described rotary load detection signal and differentiates rotary load, and described rotary load judgement unit has: specify rotary load judgement unit, and it differentiates that whether rotary load is higher than appointment rotary load; And output unit, it exports the result of described rotary load judgement unit, when being made described motor drive by appointment dutycycle by described driver element, when described rotary load judgement unit outputs the signal higher than described appointment rotary load, the first dutycycle that described driver element setting value is larger than described appointment dutycycle.
Invention effect
According to the present patent application, by carrying out changing the rotating speed corresponding to the load of the target object cut off or the control of torque, the power consumption of device can be reduced.
Accompanying drawing explanation
Fig. 1 is the stereoscopic figure of motor involved in the present invention.
Fig. 2 be motor involved in the present invention sectional view.
Fig. 3 is the schematic diagram of the food processor being equiped with motor of the present invention.
Fig. 4 is the schematic diagram of the grass mower being equiped with motor of the present invention.
Fig. 5 is the flow chart that one embodiment of the present invention is shown.
Fig. 6 is the flow chart that one embodiment of the present invention is shown.
Detailed description of the invention
In this manual, by the upside in the central axial direction of the motor of Fig. 1 referred to as " upside ", downside referred to as " downside ".In addition, position relationship when above-below direction is not the equipment that loading reality is shown, direction.Further, the direction with centerline axis parallel is called " axis ", by the radial direction centered by central axis referred to as " radial direction ", by the circumference centered by central axis referred to as " circumference ".
<1. the overall structure > of motor
The motor of present embodiment uses as the drive source making following cutter (blade) rotate, the cutter (blade) that the food processing equipments such as such as rod stirrer, hand mixer, blender, food processor are relevant; The cutter (blade) that grass mower, hay mover etc. are relevant to farm implements; And other cutter (blade).Below, the equipment being equiped with motor 1 is called " drive unit ".
Fig. 1 is the stereoscopic figure of the motor 1 involved by present embodiment.Fig. 2 is the sectional view of motor 1.As shown in Figure 1 and Figure 2, motor 1 has stationary part 2 and rotating part 3.Stationary part 2 is fixed on the housing of drive unit (not shown).Rotating part 3 is supported to and can rotates relative to stationary part 2.
The stationary part 2 of present embodiment has bracket 21, bottom bracket 22, stator core 23, coil 24, upper insulating part 25, lower insulating part 26, circuit board 27 and bearing portion 28.
Bracket 21 keeps stator core 23 and bearing portion 28 (upper bearing (metal) 281).More particularly, bracket 21 contacts with circuit board 27, and is fixedly sandwiched by multiple fixed part 61 with bottom bracket 22 and keep stator core 23.Bracket 21 is for there being lid substantially cylindrical shape.Bracket 21 is metal parts.Bracket 21 be by make with zinc be main component metal molten and flow into mould and shaping, the i.e. parts that obtain of so-called casting die.In addition, the kind of metal is not defined as zinc, also can use aluminium and other metal.Further, manufacture method be may not be casting die but is processed by other the processing method such as pressing.Bracket 21 may not be metal but resinous.
Bottom bracket 22 keeps stator core 23 and bearing portion 28 (lower bearing 282).Bottom bracket 22 is for there being end substantially cylindrical shape.Bottom bracket 22 is metal parts.Further, multiple hole (not shown) is circumferentially provided with in lower cover portion 221.By inserting through screw in this hole, motor 1 and drive unit are fixed.
Bottom bracket 22 by make with zinc be main component metal molten and flow into mould and shaping, the i.e. parts that obtain of so-called casting die.In addition, the kind of metal is not defined as zinc, also can use aluminium and other metal.Further, manufacture method be may not be casting die but is processed by other the processing method such as pressing.Bracket 21 may not be metal but resinous.Further, in the present embodiment, by keeping stator core 23 and bearing portion 28 (lower bearing 282) for the bottom bracket 22 of single parts.Therefore, it is possible to stator core 23 and axle 31 described later are accurately located each other.
Stator core 23 and coil 24 are the positions played a role as the armature of motor 1.Stator core 23 is by by the electromagnetic steel plates such as silicon steel plate (centrally axis J1 direction vertically.Identical below) stacked steel plate that is laminated forms.Stator core 23 has: circular core-back 231; And from core-back 231 towards radially inner side outstanding multiple magnetic pole tooths 232.Core-back 231 keeps by being sandwiched by bracket 21 and bottom bracket 22.The outer peripheral face of core-back 231 is the outer peripheral face of motor 1 except axial top and axial bottom.The circumferential width at the position of the winding coil 24 of each magnetic pole tooth 232 of stator core 23 is less than two times of the width of the radial direction of core-back 231.Further, in the present embodiment, the quantity of magnetic pole tooth 232 is six.
Here, the outer peripheral face of stator core 23 except not covered by bottom bracket 22 and bracket 21 near upper end He except lower end, and exposes from bottom bracket 22 and bracket 21.That is, compared by the situation that bottom bracket 22 and bracket 21 cover with the entirety of the outer peripheral face of stator core 23, in the present embodiment, area is little in opposite directions for the outer peripheral face of stator core 23 and the radial direction of bottom bracket 22 and bracket 21.Therefore, even if bottom bracket 22 and bracket 21 are magnet, be also not easy to produce the leakage field from the outer peripheral face of stator core 23 to bottom bracket 22 and bracket 21.Therefore, it is possible to reduce the iron loss produced by bottom bracket 22 and bracket 21, improve the efficiency of motor 1.
Through hole 233 is formed with the boundary of magnetic pole tooth 232 in a part of core-back 231 of stator core 23.In the present embodiment, the number of through hole 233 is three.Preferred through hole 233 equally spaced configures in the circumferential centered by central axis.In the present embodiment, the interval that through hole 233 is observed across 120 degree from central shaft configures.Through hole 233 does not limit for this reason, can be the groove to radially inner side depression yet.Fixed part 61 described later is through with at through hole 233 place.
The cannelure 234 extended vertically is formed at the outer peripheral face of stator core 23.Insert at cannelure 234 place or be fitted together to and have the jut 216 of bracket 21 and the jut 228 of bottom bracket 22.Thus, the radial direction of bracket 21 and bottom bracket 22 and the location of circumference is carried out.
Coil 24 is made up of the wire be wound in around magnetic pole tooth 232.Coil 24 is wound in magnetic pole tooth 232 across insulating part.In the present embodiment, wire is connected by so-called star-star connection.Therefore, U phase, V phase, W phase and these four ends public are drawn from coil 24.Derivative each end difference soldering is in circuit board 27.If provide drive current by circuit board 27 to coil 24, then produce radial magnetic flux at magnetic pole tooth 232 place as magnetic core.Then, by the effect of the magnetic flux between magnetic pole tooth 232 and the rotor core 33 of rotating part 3 side, produce the torque of circumference.Consequently, rotating part 3 rotates centered by central axis J1 relative to stationary part 2.
Upper insulating part 25 and lower insulating part 26 are the resinous parts with stator core 23 and coil 24 electric insulation.Upper insulating part 25 is configured at the upside of stator core 23.Lower insulating part 26 is configured at the downside of stator core 23.In other words, stator core 23 is sandwiched between insulating part 25 and lower insulating part 26.Upper insulating part 25 covers the upper surface of magnetic pole tooth 232.Lower insulating part 26 covers the lower surface of magnetic pole tooth 232.Further, upper insulating part 25 and lower insulating part 26 cover the side of magnetic pole tooth 232.Insulating part is formed by upper insulating part 25 and lower insulating part 26.In the present embodiment, be wound in magnetic pole tooth 232 by coil 24 from upper insulating part 25 and lower insulating part 26 and insulating part is fixed on stator core 23.
Upper insulating part 25 and lower insulating part 26 have between magnetic pole tooth 232 and coil 24, make the part of magnetic pole tooth 232 and coil 24 electric insulation.Further, at the radial outside of coil 24, upper insulating part 25 has the core-back insulation division 252 of continuous print ring-type in the circumferential.Core-back insulation division 252 is configured at the radial outside of coil 24.Core-back insulation division 252 is for making coil 24 when volume collapses and the position of other part insulates.The assembly of stator core 23, coil 24, upper insulating part 25, lower insulating part 26 is defined as armature 29.
Circuit board 27 is for having the substrate of the distribution for drive current to be supplied to coil 24 from external power source.Circuit board 27 when overlooking in roughly circular plate shape.The profile of circuit board 27 is roughly consistent with the profile of upper insulating part 25 described later.Circuit board 27 is fixed on the seat surface 2531 as the upper surface of upper insulating part 25.Further, the Magnetic Sensor 271 of the rotating speed for detecting rotating part 3 is provided with at the lower surface of circuit board 27.Magnetic Sensor 71 such as uses Hall element.In addition, the encoder replacing Hall element or increase except Hall element can be also equiped with.From detecting this viewpoint of precision rotated, encoder more can obtain high accuracy.
With reference to Fig. 2, bearing portion 28 is the parts supported by the axle 31 of rotating part 3 as freely rotating.Bearing portion 28 is made up of upper bearing (metal) 281 and lower bearing 282.Upper bearing (metal) 281 is held in the inner peripheral surface 2121 of the maintaining part 212 of bracket 21.Lower bearing 282 is held in bottom bracket 22.Bearing portion 28 such as uses and makes the outer ring ball bearing that rotate relative to inner ring by spheroid.But bearing portion 28 also can use the bearing of the alternate manner such as sliding bearing, FDB.
The rotating part 3 of present embodiment has axle 31, rotor retainer 32 and rotor magnet 33.Axle 31 is the centrally roughly columned parts that extend at above-below direction of axis J1.Axle 31 rotates while supporting above-mentioned bearing portion 28 centered by central axis J1.The bottom of axle 31 is outstanding to the below of bottom bracket 22.And the upper end of axle 31 is outstanding to the top of circuit board 27.Bottom or the upper end of axle 31 are connected with the drive division of drive unit by Poewr transmission mechanisms such as gears.But the drive division of drive unit also can by axle 31 Direct driver.
Rotor retainer 32 is the parts rotated together with axle 31 at stator core 23 and the radially inner side of coil 24.The rotor retainer 32 of present embodiment is made up of automatic steel.Rotor retainer 32 is shaped by cutting.The cross section of rotor retainer 32 is roughly H-shaped shape, and has central portion 321 and cylindrical portion 322.Central portion 321 is positioned at the axially central authorities of rotor retainer 32, and the axle 31 of side face press-in within it.Cylindrical portion 322 is for being positioned at the radial outside of central portion 321, and the roughly cylindric position extended to axial the upper side and lower side of central portion 321.
Although in the present embodiment the shape of rotor retainer 32 being formed as cross section is roughly H-shaped shape, be not limited to this.Also the shape of rotor retainer 32 only can be formed as drum.Further, also the shape of rotor retainer 32 can be formed as lid roughly cylindric, have been formed by punch process.Further, also rotor retainer 32 can be obtained by laminated magnetic steel plate.Further, also rotor retainer 32 can be obtained by sintering.Further, also the parts of laminated magnetic steel plate and the roughly cylinder-like part that covers by punch process can be combined and obtain rotor retainer 32.Further, although be the rotor of so-called SPM type (Surface-permanentmagnet, surface magnet) in the present embodiment, this is not limited to.Also can be the rotor of so-called IPM type (Interiorpermanent-magnet, built-in magnet type).During for IPM type rotor, preferred rotor retainer 32 is formed by laminated magnetic steel plate.
Rotor magnet 33 is drum, and is fixed on the outer peripheral face of the cylindrical portion 322 of rotor retainer 32.The surface of the radial outside of rotor magnet 33 is and stator core 23 and coil 24 magnetic pole strength in opposite directions diametrically.The mode that rotor magnet 33 is alternately arranged in the circumferential with the magnetic pole strength of the magnetic pole strength of N pole and S pole is magnetized.In addition, about rotor magnet 33, also can replace the magnet of drum, and configure multiple magnet in the mode that N pole and S pole are alternately arranged in the circumferential.Further, as mentioned above, can be also IPM type rotor, rotor magnet 33 is built in rotor retainer 32.
(food processor)
Below the example of food processor 41 as drive unit is described.With reference to Fig. 3, food processor 41 has base portion 411, operating portion 412 and food processing portion 413.Motor 1 is held in base portion 411.The axle 31 of motor 1 extends towards side, food processing portion 413.Operating portion 412 has the multiple switches for user's operation.
Food processing portion 413 has container part 4131 and blade 4132.Container part 4131 is that have can the parts of the lid of opening and closing and the cup-shaped of handle.In container part 4131, fruit and other food materials such as the vegetables such as tomato, potato, orange are put into by user.Blade 4132 is driven by the axle 31 of motor 1.If axle 31 rotates, then blade 4132 rotates, and cuts off food materials.Thereby, it is possible to processing food materials.
But, when making blade 4132 rotation cut off food materials, have according to the kind of food materials and hold scissile food materials and do not allow scissile food materials.In the example of above-mentioned vegetables, tomato is because containing a lot of moisture, therefore softness is easily cut off, and therefore potato is not easy because moisture is few and hard to cut off.In this case, hold scissile food materials if will equally cut off and do not allow scissile food materials, first, when have adjusted motor output by the scissile food materials of appearance, producing and can not cut off the unfavorable condition not allowing scissile food materials.Again by be not easy to cut off food materials have adjusted motor export time, become to cut off by required above power and hold scissile food materials, there is the problem that power consumption increases.
(grass mower)
Below the example of grass mower 51 as drive unit is described.With reference to Fig. 4, grass mower 51 has handle portion 511, bar portion 512, battery unit 513 and drive division 514.
Handle portion 511 is arranged on two places.Handle portion 511 is the position that operator can hold when using grass mower 51.The operating portion 5111 that operator operates grass mower 51 is configured with at handle portion 511 place.
Bar portion 512 is bar-shaped position, and is connected with handle portion 511, battery unit 513 and drive division 514.
Battery unit 513 is positioned at the end side end in bar portion 512.Battery unit 513 has the portion of terminal 5132 that battery 5131 is connected with battery 5131.Battery 5131 is supplied to motor 1 electric power.Battery unit 513 is under operator's using state, and battery unit 513 is positioned at the rear side of operator.
Drive division 514 is positioned at the other end side end in bar portion 512.Drive division 514 has motor 1, reducing gear 5141 and blade 5142.Reducing gear 5141 has multi-stage gear, and be configured at the gears meshing of end of axle 31.When the axle 31 of motor 1 is by driving, the reducing gear 5141 that is rotated through of axle 31 is passed to blade 5142.Blade 5142 is discoideus position, and has sword at outer peripheral face.By the rotation of blade 5142, grass can be cut off when grass contacts with blade 5142.Consequently, grass can be cut.
But, when making blade 5134 rotation cut off grass, have according to the kind of grass and hold scissile grass and do not allow scissile grass.Will when holding scissile grass and cutting grass with the place not allowing scissile grass to mix, hold scissile grass if want equally to cut off and do not allow scissile grass, then first, when have adjusted motor output by the scissile grass of appearance, produce and can not cut off the unfavorable condition not allowing scissile grass.In addition, by be not easy to cut off grass have adjusted motor export time, exist to cut off by required above power and hold scissile grass, thus the problem that power consumption increases.If power consumption increases, then produce the unfavorable condition that can not grass mower be used for a long time such.
(circuit structure)
The overview of motor and device for driving cutter is described.By AC-DC power circuit or DC-DC power source circuit, voltage is applied to control microcomputer and motor drive circuit.Carry out PWM control by controlling microcomputer, motor drive circuit is to control microcomputer instruction dutycycle (DUTY ratio).Motor drive circuit carrys out drived control motor by the dutycycle of paying.Driver element is realized by control microcomputer and motor drive circuit.Control microcomputer also can have any one unit in rotating speed judgement unit, rotary load judgement unit and rotary load detecting unit.Rotary detecting circuit both can realize by controlling microcomputer, also can be realized by encoder, Hall element.
Control microcomputer, encoder, Hall element both can be installed on motor, also can be installed on device.
Fig. 5 is for illustrating the flow chart of the action step involved by an exemplary embodiment of the present invention.Below, the action of embodiment when being realized rotary detecting circuit by encoder is described.
First, control to specify dutycycle to be 10% carry out CD-ROM drive motor (S1) by PWM.At this moment, owing to not having load at cutter place, therefore the rotating speed of motor is for specifying rotating speed.Next, when target object and tool contact, owing to applying load to cutter, therefore the rotating speed of motor changes.At this moment, the dutycycle being controlled to carry out controlling by PWM is still 10%.
When the rotating speed of motor changes, detect the rotation detection signal rotated and change.In the embodiment of Fig. 2, rotation detection signal is formed by the pulse signal generated from encoder.Rotating speed judgement unit is made to calculate rotating speed by reading this pulse signal.Specifically, control microcomputer and have rotating speed judgement unit, rotating speed judgement unit calculates rotating speed by carrying out counting to the quantity of the pulse signal in the time of specifying.
The rotating speed of motor is described higher than the situation of lower limit higher than the situation of lower limit rotating speed, the count value of namely at the appointed time interior pulse signal.In addition, in the example of above-mentioned food processor, tomato meets this situation.Further, in the example of above-mentioned grass mower, hold scissile grass and meet this situation.In this kind of situation, dutycycle is not changed, and make cutter rotate (S10) under rotating speed drops to the state lower than appointment rotating speed.Then, end object object add man-hour, owing to not applying load to cutter, therefore recover specify rotating speed.By this control, owing to controlling without unnecessary PWM, and cutter can be driven with the rotating speed of minimum, therefore, it is possible to the power consumption of restraining device.
Next, the rotating speed of motor is described lower than the situation of lower limit lower than the situation of lower limit rotating speed, the count value of namely at the appointed time interior pulse signal.In addition, in the example of above-mentioned food processor, potato meets this situation.Further, in the example of above-mentioned grass mower, scissile grass is not allowed to meet this situation.At this moment, cutter for the rotating speed of processing object object, is therefore extremely slow down or halted state (S2) due to not enough.Therefore, for the pulse signal of rotation detection signal count value can not at the appointed time in detect or reduce.At this moment, rotating speed is exported (S3) lower than the signal of lower limit rotating speed by rotating speed judgement unit.Therefore, by rotating speed judgement unit by rotating speed lower than lower limit rotating speed signal export time, driving control unit improves rotating speed by changing the first dutycycle, thus can processing object object.In the present embodiment, the first dutycycle is at this moment set as 50% (S11).That is, when rotating speed judgement unit outputs the signal lower than lower limit rotating speed, driver element setting value is than specifying the first dutycycle that dutycycle is large.
As mentioned above, set the dutycycle that can process due to the hardness according to target object, therefore, it is possible to process with most suitable power consumption.Consequently, can the unwanted power consumption of restraining device.
Next, even if to being set as that the first dutycycle can not the situation of processing object object be described.In this case, rotate judgement unit again to calculate the count value of the pulse signal in the fixed time.When the count value of pulse signal is lower than lower limit, the signal of rotating speed lower than lower limit speed exports by rotating speed judgement unit.Then, the second dutycycle that driving control unit setting value is larger than the first dutycycle.In the present embodiment, the second dutycycle is set as 80% (S4).
Even if be set as the second dutycycle can not processing object object time (S5), can by using identical rotating speed judgement unit setting the 3rd dutycycle.In the present embodiment, the 3rd dutycycle is set as 100%.
In general, the rotating speed being applicable to processing object object is according to the hardness of target object, viscosity and changing.Such as, when target object is soft object, just can process without the need to the rotating speed increasing cutter.But, when target object is hard object, need the rotating speed increasing cutter.If wanted with the less state of rotating speed to process hard target object, then cutter can be absorbed in target object or be only friction object object.
When the viscosity of target object is low, owing to diminishing to the load of cutter, therefore rotating speed can be less state.But during the viscosity height of target object, owing to becoming large to the load of cutter, therefore rotating speed needs to become large.
By the setup control of above-mentioned dutycycle, the rotating speed of applicable processing object object automatically selected by motor.Like this, in the device driving cutter, due to unnecessary High Rotation Speed can be avoided, therefore, it is possible to reduce power consumption.
Finally, even if can not the situation of processing object object be described setting the 3rd dutycycle.This situation is also as above-mentioned, and rotating speed judgement unit differentiates whether rotating speed reduces (S7).But, even if be set as the 3rd dutycycle, also when rotating speed judgement unit judges that rotating speed reduces, stop CD-ROM drive motor.That is, dutycycle is set as 0% by driver element.At this moment, also mistake can be informed in a device.
Controlled by this rotating speed, can prevent from applying excessive load to motor, and can prevent motor from breaking down because of overcurrent.
In addition, be described after arbitrary dutycycle dutycycle is set as in the first dutycycle, the second dutycycle, the 3rd dutycycle.
In change dutycycle, and cutter rotates, and when starting processing object object, applies load to cutter, and rotating speed is for specifying below rotating speed.Certainly, at this moment rotating speed higher than lower limit rotating speed.Then, during through terminating processing object object after a while, owing to reducing the load of cutter, therefore rotating speed little by little improves.
At this moment, rotating speed judgement unit has and differentiates rotating speed whether higher than the regulation rotating speed judgement unit of regulation rotating speed.Dutycycle is set as when outputing the signal higher than regulation rotating speed specifying dutycycle by rotating speed judgement unit.
In addition, after dutycycle being set as specify dutycycle, even if drive the fixed time, when also not applying load to cutter, make to stop rotational automaticly.Thus, owing to driving the device of cutter can judge the processing finishing target object, and stop automatic rotation, therefore, it is possible to fully automatically processing object object.
At this moment, also whether can be changed by the pulse value calculated with rotating speed judgement unit in time of specifying to the load of cutter and judge.Further, also can be detected the variation value of current value by other approach, differentiate not higher than appointment rotary load.
Appointment rotating speed in rotating speed judgement unit, lower limit rotating speed and regulation rotating speed are described.Rotating speed is specified to refer to according to appointment dutycycle, by the speed setting driven for specifying rotating speed.
In the first preferred embodiment, lower limit speed is less than 70% of command speed.Such as, when the target object of processing is soft object, even if also can process with the speed of specifying.But, want processing object object, and rotating speed becomes less than 70%, is then difficult to still to specify dutycycle to process.So, lower limit rotating speed is set to and specifies less than 70% of rotating speed, when lower than lower limit rotating speed, by dutycycle is set to the first dutycycle, make processing become possibility.
Further, regulation rotating speed is specify rotating speed more than 85%.Such as, through after a while and the process finishing of target object time, the load of cutter is alleviated.Therefore, there is no need dutycycle to be set as specify more than dutycycle.That is, can by differentiating that rotating speed differentiates process finishing.Continuation specifies more than dutycycle to drive, then consume unnecessary electricity.Therefore, regulation rotating speed being set to and specifying 85% of rotating speed, when higher than regulation rotating speed, by dutycycle being set as specifying dutycycle, unnecessary power consumption can be reduced.
As the second preferred embodiment, also can replace encoder with Hall element and be used as rotary detecting circuit.Because Hall element is configured on the circuit board of motor, therefore save space, the motor driving cutter can be used in miniaturized.
Fig. 6 is the flow chart that the exemplary action step involved by an embodiment of the present invention is shown.
In the 3rd preferred embodiment, by differentiating that rotary load carries out the control of rotating speed.When rotary load judgement unit outputs the signal higher than appointment rotary load, driver element setting value is than specifying the first dutycycle that dutycycle is large.
Such as, the method for the current value of the detection motor of the method as differentiation rotary load is described.By the threshold value of specifying is set as that current value differentiates appointment rotary load.To cutter generation load during processing object object, current value increases.Detect this increase to differentiate whether higher than the threshold value of specifying.The setting of the threshold value of current value also can be calculated by the absolute value of current value.Further, also can calculate the difference value of the current value of specifying dutycycle according to current value when producing load, and setting is relative to the threshold value of this difference value.In addition, also multiple threshold value can be set.Such as, also the first rotary load that rotary load is large can be specified by setting value ratio, the second rotary load that all right setting value is larger than the first rotary load.
Finally, in order to prevent the state being absorbed in target object with cutter from pinning, cutter reverse rotation is preferably enable.The method of the reverse rotation controlling cutter is below described.
Such as, in the first preferred embodiment, the pulse signal of rotating speed judgement unit to the encoder in the fixed time counts.After dutycycle being set as the 3rd dutycycle, when rotating speed judgement unit is judged lower than lower limit rotating speed, control microcomputer and export positive reverse rotation signal to motor.This reverse rotation controls also to carry out before error informing in the first preferred embodiment.Further, driver element also can not after being set as the 3rd dutycycle by dutycycle, and after the first dutycycle or the second dutycycle.
In addition, by being 10% by the specified rotation of motor, by uncharge rotation setting dutycycle, the rotating torques of motor can be improved further.That is, when processing stiff materials, dutycycle is improved.When improving dutycycle, can be come by optimal dutycycle processing object object by detection rotating speed, current value, rotary load.
Claims (11)
1. a brushless DC motor, it is for cutting by making cutter rotate or cut target object, and the feature of described brushless DC motor is to have:
Axle, it is made cutter rotate when described brushless DC motor drives;
Driver element, it controls described brushless DC motor is driven by PWM;
Rotary detecting circuit, its detection rotates and exports rotation detection signal; And
Rotating speed judgement unit, it calculates rotation detection signal and differentiates rotating speed,
Described rotating speed judgement unit has:
Lower limit rotating speed judgement unit, it differentiates described brushless DC motor applying load, and whether rotating speed is lower than lower limit rotating speed; And
Output unit, it exports the result of described rotating speed judgement unit,
When being made described motor drive by appointment dutycycle by described driver element,
When described rotating speed judgement unit outputs the signal lower than described lower limit rotating speed, the first dutycycle that described driver element setting value is larger than described appointment dutycycle.
2. the motor for making cutter rotate according to claim 1, is characterized in that,
Using in the non-loaded state by specify dutycycle drive rotating speed as appointment rotating speed time,
Lower limit rotating speed is specify rotating speed less than 70%.
3. the motor for making cutter rotate according to claim 1, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
Rotating speed judgement unit also has regulation rotating speed judgement unit, and described regulation rotating speed judgement unit differentiates that whether rotating speed is higher than regulation rotating speed,
Rotating speed judgement unit also has specifies dutycycle the unit that motor is driven higher than dutycycle being set as during regulation rotating speed outputing.
4. the motor for making cutter rotate according to claim 1, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
During using the rotating speed by the driving of appointment dutycycle as appointment rotating speed,
Regulation rotating speed is specify rotating speed phase more than 85%.
5. the motor for making cutter rotate according to claim 1, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
Rotation detection signal is formed with the pulse signal generated by encoder,
The quantity of rotating speed judgement unit to the pulse signal within the time of specifying counts,
When counting is lower than lower limit, rotating speed judgement unit is determined as lower than lower limit rotating speed.
6. the motor for making cutter rotate according to claim 1, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
Rotation detection signal is formed with the pulse signal generated by Hall element,
The quantity of rotating speed judgement unit to the pulse signal within the time of specifying counts,
When counting is lower than lower limit, rotating speed judgement unit is determined as lower than lower limit rotating speed.
7. the motor for making cutter rotate according to claim 1, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
Rotating speed judgement unit is differentiated by the absolute value of current value,
When the absolute value of current value is higher than rated current higher limit, rotating speed judgement unit is determined as lower than lower limit rotating speed.
8. the motor for making cutter rotate according to claim 1, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
Rotating speed judgement unit passes through Microcomputer Calculation.
9. a brushless DC motor, it is for cutting by making cutter rotate or cut target object, and the feature of described brushless DC motor is to have:
Axle, it is made cutter rotate when described brushless DC motor drives;
Driver element, it controls described brushless DC motor is driven by PWM;
Rotary load detecting unit, it detects rotary load and exports rotary load detection signal; And
Rotary load judgement unit, it calculates described rotary load detection signal and differentiates rotary load,
Described rotary load judgement unit has:
Specify rotary load judgement unit, it differentiates that whether described rotary load is higher than appointment rotary load; And
Output unit, it exports the result of described rotary load judgement unit,
When being made described motor drive by appointment dutycycle by described driver element,
When described rotary load judgement unit outputs the signal higher than described appointment rotary load, the first dutycycle that described driver element setting value is larger than described appointment dutycycle.
10. the motor for making cutter rotate according to claim 9, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
Rotary load judgement unit also has regulation rotary load judgement unit, and described regulation rotary load judgement unit differentiates that whether rotary load is higher than regulation rotary load,
Rotary load judgement unit also has specifies dutycycle the unit that motor is driven higher than dutycycle being set as during regulation rotary load outputing.
11. motors for making cutter rotate according to claim 9, it is the brushless DC motor for making cutter rotate, and it is characterized in that,
During using the rotating speed by the driving of appointment dutycycle as appointment rotating speed,
Regulation rotary load is specify rotary load more than 85%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361867244P | 2013-08-19 | 2013-08-19 | |
| US61/867,244 | 2013-08-19 | ||
| PCT/JP2014/071127 WO2015025749A1 (en) | 2013-08-19 | 2014-08-09 | Motor |
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| CN105408074A true CN105408074A (en) | 2016-03-16 |
| CN105408074B CN105408074B (en) | 2017-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN108696202A (en) * | 2017-04-03 | 2018-10-23 | 美蓓亚三美株式会社 | Motor drive control device, motor drive control method and tube pump |
| CN112398415A (en) * | 2019-07-30 | 2021-02-23 | Bsh家用电器有限公司 | Household appliance having an automatically adjustable motor and method for operating a household appliance |
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| CN105408074B (en) | 2017-09-08 |
| WO2015025749A1 (en) | 2015-02-26 |
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