CN102832859B - Accurate positioning method of rotor of brushless direct-current motor for direct drive type washing machine - Google Patents
Accurate positioning method of rotor of brushless direct-current motor for direct drive type washing machine Download PDFInfo
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- CN102832859B CN102832859B CN201210339437.9A CN201210339437A CN102832859B CN 102832859 B CN102832859 B CN 102832859B CN 201210339437 A CN201210339437 A CN 201210339437A CN 102832859 B CN102832859 B CN 102832859B
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Abstract
The invention provides an accurate positioning method of a rotor of a brushless direct-current motor for a direct drive type washing machine. According to an electromechanics principle, the phase separation of a winding of a motor is carried out according to a 60-degree phase belt method, and a stator is also stretched according to a circumferential direction. After an A-phase winding and a B-phase winding of the stator of the motor are electrified with direct current, a magnetic field is formed in the stator, and the electric angle direction of the magnetic field along the circumferential direction at interval of 180 degrees is alternated for one time. The primary winding is electrified with the direct current, static torque can be generated in the motor, and the rotor can be stopped at the position of a stable equilibrium point under the action of electromagnetic torque, so that the positioning of the rotor of the motor is realized. According to the accurate positioning method of the rotor of the brushless direct-current motor for the direct drive type washing machine, any position sensor is not needed, an open-loop control mode is adopted, and the accurate positioning control of the rotor of the motor in the circumferential direction is realized by the modes of electrifying the direct current in the primary winding of the brushless direct-current motor and also controlling the magnitude of the electrified current. The use requirement of a system of a direct drive type full-automatic washing machine can be met according to the accuracy of the method provided by the invention.
Description
Technical field
The present invention relates to a kind of accurate positioning method of the brushless DC motor rotor for direct-drive type washing machine, belong to rotor localization method technical field.
Background technology
Rotating speed and dehydrating speed numerical value difference several times are washed in single container washing and extracting machine.For common non-straight drive type full automatic washing machine, there is the speed-reducing clutch that integrated, the switching of motor driving condition under washing-dehydration two states can be completed.And for novel direct drive type full automatic washing machine, need the novel clutch of outfit one to complete this state task switching.This novel clutch does not have the structures such as reduction gearing, has not needed deceleration, and is just realized the switching of washing-dewatering state by the engaging structure of some particular design.Complete this to switch, need accurately to locate at circumferencial direction rotor, and this is the new problem do not run in former washing machine.
Summary of the invention
The object of the invention is the pinpoint problem in order to solve brushless DC motor rotor in direct-drive type washing machine, and then a kind of accurate positioning method of the brushless DC motor rotor for direct-drive type washing machine is provided.
The object of the invention is to be achieved through the following technical solutions:
One, being connected with casing by the stationary part of motor, being then assemblied on washing machine, determine the locus of motor stator winding, works in coordination in the installation site of stator and the stator tooth position of washing machine special clutch; Two, to motor stator A, B two phase winding lead to direct current, described give motor stator A, B two phase winding lead to the rated current 1A that galvanic electric current is motor; The composite magnetic power that A phase and B phase winding produce forms fixing magnetic field, a direction in the stator; Three, according to Electrical Motor principle, by 60 degree of facies tract methods, phase-splitting is carried out to winding, stator is circumferentially launched in direction; After the energising of A, B phase winding, the magnetic field formed in stator along the circumferential direction at interval of 180 degree of electrical degree direction alternations once; Four, Integrated Service Digital Network direct current, produces static torque in motor; Five, rotor can stop in multiple stable equilibrium position under electromagnetic torque effect, thus achieves the location of rotor.
The present invention has the following advantages: the present invention is without the need to any position transducer, adopt open loop control mode, control the mode of electrical current size by direct current logical in brshless DC motor one wire-wound group, achieve rotor accurate positioning control in a circumferential direction.The inventive method is simple, and it is convenient to control, and precision can meet the instructions for use of direct drive type full automatic washing machine system.
Accompanying drawing explanation
Fig. 1 is the magnetic potential composite diagram after motor winding Integrated Service Digital Network electricity of the present invention;
Fig. 2 is the magnetic field corresponding relation schematic diagram after energising;
Fig. 3 is the static torque performance diagram after energising.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail: the present embodiment is implemented under premised on technical solution of the present invention, gives detailed execution mode, but protection scope of the present invention is not limited to following embodiment.
As shown in FIG. 1 to 3, the accurate positioning method of a kind of brushless DC motor rotor for direct-drive type washing machine involved by the present embodiment, one, the stationary part of motor is connected with casing, is then assemblied on washing machine, determine the locus of motor stator winding; Two, to motor stator A, B two phase winding lead to direct current, the composite magnetic power that A phase and B phase winding produce forms fixing magnetic field, a direction in the stator; Three, according to Electrical Motor principle, by 60 degree of facies tract methods, phase-splitting is carried out to winding, stator is circumferentially launched in direction.After the energising of A, B phase winding, the magnetic field formed in stator along the circumferential direction at interval of 180 degree of electrical degree direction alternations once; Four, Integrated Service Digital Network direct current, produces static torque in motor; Five, rotor can stop at the position of stable equilibrium point Q under electromagnetic torque effect, thus achieves the location of rotor.
The described galvanic current value giving motor stator A, B two phase windings logical is 1A.
1, the present invention is applicable to the direct drive type full automatic washing machine that brshless DC motor drives, and object is for the accurate location of rotor at circumferencial direction.
2, one of technical essential of the present invention, be that motor winding adopts the galvanic mode of Integrated Service Digital Network, the detent force utilizing energising to produce realizes rotor accurate location along the circumferential direction.
3, technical essential two of the present invention is that control system runs on open loop control mode, without any need for position transducer.
4, technical essential three of the present invention is worked in coordination in the installation site of brushless DC motor stator and the stator tooth position of washing machine special clutch, and completion status switches.
5, general principle of the present invention is described as follows:
(1) stationary part of motor is connected with casing and is assemblied on washing machine, and stator winding locus is determined.Brushless DC motor stator winding construction schematic diagram as shown in Figure 1.When A, B two phase winding lead to direct current time, the composite magnetic power direction that A phase and B phase winding produce is as shown in Figure 2.Be equivalent to define fixing magnetic field, a direction in the stator.
(2) brushless DC motor stator is multi-groove structure, according to Electrical Motor principle, carries out phase-splitting by 60 degree of facies tract methods to winding.Circumferentially launched in direction by stator, when A, B phase winding is energized, form magnetic field as shown in Figure 2 in stator, magnetic field along the circumferential direction at interval of 180 degree of electrical degree direction alternations once.
Rotor is multi-polar structure, as shown in Figure 2.When motor stator N pole and position, rotor S pole exist an angle, rotor must be subject to the effect of electromagnetic torque.Integrated Service Digital Network direct current, the static torque curve that motor produces, namely the relation of electromagnetic torque and rotor position of magnetic pole angle as shown in Figure 3.
(3), under desirable no-load condition, rotor can stop at the position of stable equilibrium point Q under electromagnetic torque effect, thus achieves the location of rotor.Owing to there is frictional resistance in actual axle system, rotor finally can be positioned at the electrical degree Δ θ place that electromagnetic torque and load resistance square balance each other, and this angle is called error angle.The P point similar to Q point and S point, electromagnetic torque is also zero in theory, and the N pole and the N pole that are corresponding stators and rotators overlap, and S pole and S pole overlap, and are unstable equilibrium points, can not be used as anchor point.
(4) for specific washing machine, the motor load moment of resistance one timing, electromagnetic torque is larger, corresponding error angle is less, positioning precision is higher, and electromagnetic torque size depend on AB phase winding the size of logical direct current location current, can need according to available accuracy the size determining required location current.
As shown in Figure 1, to certain a Full-automatic wave wheeled washing machine Direct driver brushless DC motor system being applied to 5.0kg clothing, lead to the direct current of 1A at AB line, under no-load condition, positioning precision is better than 2 °, under loading condition, positioning precision is better than 5 °, achieves the accurate positioning requirements of rotor.
The above; be only the present invention's preferably embodiment; these embodiments are all based on the different implementations under general idea of the present invention; and protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (1)
1. the accurate positioning method for the brushless DC motor rotor of direct-drive type washing machine, it is characterized in that, one, the stationary part of motor is connected with casing, then be assemblied on washing machine, determining the locus of motor stator winding, works in coordination in the installation site of stator and the stator tooth position of washing machine special clutch; Two, to motor stator A, B two phase winding lead to direct current, described give motor stator A, B two phase winding lead to the rated current 1A that galvanic electric current is motor; The composite magnetic power that A phase and B phase winding produce forms fixing magnetic field, a direction in the stator; Three, according to Electrical Motor principle, by 60 degree of facies tract methods, phase-splitting is carried out to winding, stator is circumferentially launched in direction; After the energising of A, B phase winding, the magnetic field formed in stator along the circumferential direction at interval of 180 degree of electrical degree magnetic direction alternations once; Four, Integrated Service Digital Network direct current, produces static torque in motor; Five, rotor can stop in multiple stable equilibrium position under electromagnetic torque effect, thus achieves the location of rotor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210339437.9A CN102832859B (en) | 2012-09-14 | 2012-09-14 | Accurate positioning method of rotor of brushless direct-current motor for direct drive type washing machine |
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| CN201210339437.9A CN102832859B (en) | 2012-09-14 | 2012-09-14 | Accurate positioning method of rotor of brushless direct-current motor for direct drive type washing machine |
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| CN102832859A CN102832859A (en) | 2012-12-19 |
| CN102832859B true CN102832859B (en) | 2015-06-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008206386A (en) * | 2007-01-24 | 2008-09-04 | Matsushita Electric Ind Co Ltd | Inverter apparatus |
| CN102136820A (en) * | 2010-01-27 | 2011-07-27 | 建准电机工业股份有限公司 | Sensor-free start control method for brushless DC motor |
| CN102594246A (en) * | 2012-03-02 | 2012-07-18 | 北京金自天正智能控制股份有限公司 | Zero-frequency positioning control method of alternating-current synchronous motor stator and rotor |
| CN102664506A (en) * | 2012-05-09 | 2012-09-12 | 李金东 | Permanent magnetic brushless motor with rotor positioning device and debugging and installation method thereof |
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2012
- 2012-09-14 CN CN201210339437.9A patent/CN102832859B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008206386A (en) * | 2007-01-24 | 2008-09-04 | Matsushita Electric Ind Co Ltd | Inverter apparatus |
| CN102136820A (en) * | 2010-01-27 | 2011-07-27 | 建准电机工业股份有限公司 | Sensor-free start control method for brushless DC motor |
| CN102594246A (en) * | 2012-03-02 | 2012-07-18 | 北京金自天正智能控制股份有限公司 | Zero-frequency positioning control method of alternating-current synchronous motor stator and rotor |
| CN102664506A (en) * | 2012-05-09 | 2012-09-12 | 李金东 | Permanent magnetic brushless motor with rotor positioning device and debugging and installation method thereof |
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| CN102832859A (en) | 2012-12-19 |
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