CN106329869A - Brushless direct current motor capable of reducing braking time - Google Patents
Brushless direct current motor capable of reducing braking time Download PDFInfo
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- CN106329869A CN106329869A CN201510390713.8A CN201510390713A CN106329869A CN 106329869 A CN106329869 A CN 106329869A CN 201510390713 A CN201510390713 A CN 201510390713A CN 106329869 A CN106329869 A CN 106329869A
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- braking time
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Abstract
The invention relates to a brushless direct current motor capable of reducing braking time. The brushless direct current motor comprises a stator and a rotor, wherein the rotor comprises a rotor iron core, multiple pieces of magnetic steel and a rotary shaft; square holes for allowing the multiple pieces of magnetic steel to be inserted are formed in the rotor iron core; the rotary shaft is arranged in the rotor iron core; an integral number of stator grooves are formed in the stator; and the groove-opening coefficient of the stator grooves is greater than 0.3. Compared with the prior art, the brushless direct current motor has the advantages of capability of reducing braking time of the motor, and the like.
Description
Technical field
The present invention relates to a kind of brshless DC motor, especially relate to a kind of brushless dc reducing braking time
Machine.
Background technology
The braking of motor includes mechanical braking and electric braking, and the dynamic braking in electric braking is easy and simple to handle, and high
During speed, motor braking torque is big, and down time is short, thus brshless DC motor dynamic braking is widely used in and washes
The industries such as clothing machine, blower fan, weaving loom.In textile machine, cylinder yarn when bobbin-winding machine is properly functioning, is driven to rotate,
When running into broken string, bobbin-winding machine needs to stop immediately, after treating that broken string is spliced well, is again started up motor to normal condition.
In order to improve production efficiency, client is high to the skidding time requirement of automatic winding motor.
The brushless electric machine of surface mount sintering rare-earth magnet steel is used widely in automatic winder in recent years, motor
Rotor magnetic steel uses surface mount mode, and shortcoming is the big price of magnet steel consumption, and rotor manufacture process is complicated, and
During high speed, magnet steel gets rid of de-risk, and reliability is the highest, limits the rotating speed of motor.De-wind is got rid of in order to reduce magnet steel
Danger, a kind of way is to overlap steel bushing on magnet steel surface, but steel bushing produces eddy-current loss and electric efficiency is reduced, with
Time motor cost increase, complex process.Another kind of way is that motor uses the rotor configurations embedding magnet steel, uses magnetic
Steel embeds rotor core internal type, and compared with Surface Mount magnet steel mode, technique is simple, cost reduces and motor is reliable
Property high；But find that when actual motion the dwell time of this motor is considerably longer than current Surface Mount magnet steel brushless electric machine,
This can increase the bobbin-winding machine break line treatment time, reduces production efficiency, is that client is the most acceptant.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide a kind of when reducing brake
Between brshless DC motor, the dwell time of motor making magnet steel embed rotor structure is substantially improved, and bears large inertia
Carry and the motor that dwell time is short and reliability is high is provided.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of brshless DC motor reducing braking time, including stator and rotor, described rotor includes rotor ferrum
Core, magnet steel and rotating shaft, described rotor core is provided for the square hole that magnet steel inserts, and described rotating shaft is located at and is turned
Sub-core interior, it is characterised in that described stator is provided with several stator slot, the notch of described stator slot
Width b0With stator diameter DinMeet below equation: β=(b0·Z)/πDin, wherein β is notch coefficient, and greatly
In 0.3；Z is number of stator slots.
Described β is more than 0.3, less than 0.5.
Described β is preferably 0.347.
Described stator slot is preferably 4 or 6.
When described stator slot is 6, the width of rebate of described stator slot is the 0.18 of stator diameter.
When described stator slot is 4, the width of rebate of described stator slot is the 0.27 of stator diameter.
The thickness of described magnet steel increases by 10% to 30%.
Preferably, the thickness of described magnet steel increases by 20%.
Directly Hall element is placed on the notch of stator slot.
Compared with prior art, the invention have the advantages that
1) reduce the motor braking time, improve the broken string production efficiency of bobbin-winding machine；
2) directly optimize parts, on the basis of not increasing motor cost, therefore greatly reduce the motor braking time；
3) Hall components and parts can be placed directly in notch position, simplifies the processing technique of motor.
Accompanying drawing explanation
Fig. 1 is brushless DC motor structure schematic diagram.
Fig. 2 is stator structure schematic diagram；
Fig. 3 is three-phase shortcircuit equivalent circuit；
Fig. 4 is notch coefficient and exert oneself and the graph of a relation of inductance.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
As it is shown in figure 1, a kind of brshless DC motor reducing braking time, including stator 1 and rotor, described turn
Attached bag includes rotor core 2, magnet steel 3 and rotating shaft 4.Even number square hole, magnet steel 3 it is uniformly arranged on rotor core 2
Being inserted in the square hole on rotor core 2, it is internal that rotor core 2 is located in rotating shaft 4.Described stator is provided with idol
Several stator slots, the notch coefficient of this stator slot is more than 0.3, and the notch coefficient in the embodiment of the present invention is 0.347,
As shown in Figure 2.
Stator rabbet coefficient is defined as stator rabbet width b0With stator slot away from ratio.
β=(b0·Z)/πDin (1)
Wherein Z number of stator slots, in the present embodiment, groove number is 6；
DinDiameter of stator bore.
Automatic winder skidding principle:
Automatic winder typically uses the mode of motor triple line short circuit to allow motor brake brake, motor three-phase shortcircuit
Equivalent circuit diagram is as shown in Figure 3.Rotor also can turn down due to effect of inertia always, and stator winding is in rotor field
Cutting lower can produce the electric current lagging behind rotor field, when rotating speed is higher, stator reactance is far longer than stator resistance,
90 degree, rotor field electrical angle after current hysteresis；Rotating speed declines, and stator reactance declines, and after current hysteresis, rotor field is little
In 90 degree of electrical angles.Electric current while concussion, is decayed with the form of resistance heating in the stator windings, until
The rotational kinetic energy of rotor is converted into ohmically thermal energy consumption fall.
Electric current i (t) in circuit can use formula (1) to represent:
I (t)=(ke w)/(R+jpwL) (1)
In formula (1):
Ke winding back emf coefficient；
The mechanical separator speed that w rotor rotates, unit rad/s；
R motor phase resistance；
P motor pole logarithm；
L motor phase inductance.
When the rotational of motor is fully converted to resistance heat energy, motor will stop operating, so the braking of motor
Time TsFormula (2) can be used to represent:
In formula (2):
J rotor inertia；
According to formula, short-circuit braking time T can be reduced by 2 methodss。
Method 1, can increase resistance so that consumes and increases at ohmically power, reduces the time；
Method 2, can reduce inductance so that short circuit current increases, so that consume in ohmically merit
Rate increases, and reduces braking time.
If employing method 1 increases resistance, can reduce electric efficiency, motor performance declines；In order to not affect
The performance of motor, we use the method reducing inductance to reduce the motor braking time.
The existing way reducing inductance is to increase magnet thickness reduction umber of turn, reduces the magnetic linkage of armature induction,
Thus reduce motor inductances.The limited space of the rotor of this patent, the thickness increase of magnet steel is limited
System, thus the method that this patent proposes to increase stator rabbet coefficient reduces inductance.
Change width of rebate and calculate inductance and the electromagnetic torque that stator produces, and turn with original motor inductance and electromagnetism
Square is base value, calculates the perunit value of inductance and electromagnetic torque, obtains curve shown in Fig. 4.From curve:
Increasing notch coefficient, the inductance of motor reduces therewith, motor inductances and the inversely proportional relation of notch coefficient；With
This increases notch coefficient less on the electromagnetic torque impact of motor simultaneously, when notch coefficient is more than 0.33,
Exerting oneself of motor starts to reduce, and now inductance has declined 13%.Slot opening is increased it can thus be seen that use
The mode of degree can be substantially reduced motor inductances, does not affect exerting oneself of motor simultaneously.
We select notch coefficient 0.34, and now inductance have dropped 15%, and motor is exerted oneself and only declined 0.2% simultaneously.
Magnet thickness is increased 0.8mm by the embodiment of the present invention, and inductance can reduce 16%, simultaneously by stator rabbet away from
From increase, 2mm after increasing to 6.4mm, inductance can reduce 28%.
The electric machine structure using the present invention makes motor, and the skidding time of motor substantially shortens, no-load running
Carry out short-circuit test during 5400rpm, utilize oscillograph and current clamp to observe short circuit current waveform, the braking of original motor
Time is 3.39s, and the motor braking time of the present invention is 2.25s, and the time shortens 33.6%.Meet customer requirement
2.5s (braking time of no-load running 5400rpm).
The present invention is possible not only to reduce the skidding time, it is also possible to simplify the mounting process of motor three-phase Hall, fall
Low motor cost.The Hall of bobbin-winding machine motor is placed at stator rabbet, due to the stator rabbet width of motor at present
Less, after motor winding is passed through electric current, armature field also exists interference effect to hall signal, so to laying
The slot-open-section of Hall needs to do cutting process, increases the stator rabbet width near Hall element with this.Technique is relatively
Complicated.
After using the present invention to increase motor stator notch width, Hall is placed in this notch, can reduce winding electricity
The stream impact on hall signal so that hall signal is more accurate.Calculate winding and be passed through 3 times of sinusoidal current Hall letters
Number error angle, find notch increase after, the error angle of hall signal is decreased to 2.7 degree by 7.9 degree, can
To reduce the winding current impact on hall signal.Hall components and parts can be rest directly upon notch position, it is not necessary to
Notch is carried out cutting process, motor cost, simplified processing process can be reduced.
Claims (7)
1. reducing a brshless DC motor for braking time, including stator and rotor, described rotor includes turning
Sub-iron core, magnet steel and rotating shaft, described rotor core is provided for the square hole that magnet steel inserts, and described rotating shaft sets
Inside rotor core, it is characterised in that described stator is provided with several stator slot, described stator slot
Width of rebate b0With stator diameter DinMeet below equation:
β=(b0·)/πDin, wherein β is notch coefficient, and more than 0.3；Z is number of stator slots.
A kind of brshless DC motor reducing braking time the most according to claim 1, it is characterised in that
Described β is more than 0.3, less than 0.5.
A kind of brshless DC motor reducing braking time the most according to claim 3, it is characterised in that
Described β is preferably 0.347.
A kind of brshless DC motor reducing braking time the most according to claim 1, it is characterised in that
Described stator slot is preferably 4 or 6.
A kind of brshless DC motor reducing braking time the most according to claim 5, it is characterised in that
When described stator slot is 6, the width of rebate of described stator slot is the 0.18 of stator diameter.
A kind of brshless DC motor reducing braking time the most according to claim 5, it is characterised in that
When described stator slot is 4, the width of rebate of described stator slot is the 0.27 of stator diameter.
A kind of brshless DC motor reducing braking time the most according to claim 1, it is characterised in that
Directly Hall element is placed on the notch of stator slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510390713.8A CN106329869A (en) | 2015-07-06 | 2015-07-06 | Brushless direct current motor capable of reducing braking time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510390713.8A CN106329869A (en) | 2015-07-06 | 2015-07-06 | Brushless direct current motor capable of reducing braking time |
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| Publication Number | Publication Date |
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| CN106329869A true CN106329869A (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510390713.8A Pending CN106329869A (en) | 2015-07-06 | 2015-07-06 | Brushless direct current motor capable of reducing braking time |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1195916A (en) * | 1997-04-02 | 1998-10-14 | 三星电子株式会社 | Sensorless brushless DC motor |
| CN2301811Y (en) * | 1997-06-24 | 1998-12-23 | 中国船舶工业总公司第七研究院第七一二研究所 | Permanent-magnet brushless DC motor |
| CN101106294A (en) * | 2006-07-16 | 2008-01-16 | 万德鸿 | High-speed self started frequency conversion generator |
| CN201097440Y (en) * | 2006-10-10 | 2008-08-06 | 杭州英迈克电子有限公司 | A rotor for brushless permanent magnetic motor |
| JP2009050138A (en) * | 2007-08-21 | 2009-03-05 | Samsung Electronics Co Ltd | Brushless dc motor |
| CN102739136A (en) * | 2012-07-10 | 2012-10-17 | 浙江大学 | Intermittent fillet control method for single-phase brushless direct-current motors |
| CN203014628U (en) * | 2012-12-03 | 2013-06-19 | 常州格力博有限公司 | Brushless direct current motor |
| CN203840144U (en) * | 2014-05-14 | 2014-09-17 | 台州市金宇机电有限公司 | Motor with Hall sensor installing and positioning device |
| CN204906149U (en) * | 2015-07-06 | 2015-12-23 | 上海鸣志电器股份有限公司 | Reduce brushless DC motor of time of braking |
-
2015
- 2015-07-06 CN CN201510390713.8A patent/CN106329869A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1195916A (en) * | 1997-04-02 | 1998-10-14 | 三星电子株式会社 | Sensorless brushless DC motor |
| CN2301811Y (en) * | 1997-06-24 | 1998-12-23 | 中国船舶工业总公司第七研究院第七一二研究所 | Permanent-magnet brushless DC motor |
| CN101106294A (en) * | 2006-07-16 | 2008-01-16 | 万德鸿 | High-speed self started frequency conversion generator |
| CN201097440Y (en) * | 2006-10-10 | 2008-08-06 | 杭州英迈克电子有限公司 | A rotor for brushless permanent magnetic motor |
| JP2009050138A (en) * | 2007-08-21 | 2009-03-05 | Samsung Electronics Co Ltd | Brushless dc motor |
| CN102739136A (en) * | 2012-07-10 | 2012-10-17 | 浙江大学 | Intermittent fillet control method for single-phase brushless direct-current motors |
| CN203014628U (en) * | 2012-12-03 | 2013-06-19 | 常州格力博有限公司 | Brushless direct current motor |
| CN203840144U (en) * | 2014-05-14 | 2014-09-17 | 台州市金宇机电有限公司 | Motor with Hall sensor installing and positioning device |
| CN204906149U (en) * | 2015-07-06 | 2015-12-23 | 上海鸣志电器股份有限公司 | Reduce brushless DC motor of time of braking |
Non-Patent Citations (4)
| Title |
|---|
| 佘兆铭: "《电工技术基础》", 31 October 1995, 昆明：云南大学出版社 * |
| 刘雨棣，雷新颖: "《计算机控制技术》", 30 November 2013, 西安：西安交通大学出版社 * |
| 谭建成: "《永磁无刷直流电机技术》", 31 March 2011, 北京：机械工业出版社 * |
| 陈先锋: "《伺服控制技术自学手册》", 31 January 2010, 北京：人民邮电出版社 * |
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Application publication date: 20170111 |