CN1274982A - Brushless DC motor for air exchange in air conditioner - Google Patents
Brushless DC motor for air exchange in air conditioner Download PDFInfo
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- CN1274982A CN1274982A CN00116612A CN00116612A CN1274982A CN 1274982 A CN1274982 A CN 1274982A CN 00116612 A CN00116612 A CN 00116612A CN 00116612 A CN00116612 A CN 00116612A CN 1274982 A CN1274982 A CN 1274982A
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Abstract
The brushless DC motor has a twelve-polar outer rotor and a triphase nine-polar inner stator structure, a driving module TDA5141 as control circuit to realize triphase six-state no-position sensor counter electromotive force drive. Via counter eletromotive force to supply correct change-over signal, the motor runs correctly. With no position sensor and external power switch, the drive system is simple, low in cost and reliable. The motor of the present invention may be used in air conditioner, newly developed or improved, and may be also used in driving similar load, such as a fan.
Description
The present invention relates to a kind of brushless DC motor, relate in particular to a kind of brushless DC motor for air exchange in air conditioner, belong to the electric department technical field of motors.
In the prior art, brushless DC motor commonly used, generally position sensors all, the design of its placement location and adjustment be trouble very, especially very difficult in batch process, be difficult to guarantee in each motor, all be in the optimum position, so that influence the runnability of motor.DC motor having no brush and no position sensing device is a kind of novel brushless DC motor that is developing, and is characterized in there is not position transducer.But, in order to guarantee the normal operation of motor, control-driven system in the DC motor having no brush and no position sensing device is comparatively complicated, as document " Nd-Fe-B permanent magnetic three-phase five pole brushless DC motor and non-bridge-type Driving Scheme thereof " (Dong Lingsheng, small and special electric machine, 1999,3) introduced, small product size is bigger, and the cost height is difficult to adapt to general household appliances, renew the production of wind as domestic air conditioning, thereby fail to be used widely with motor.
In actual life, air-conditioning system needs a kind of fan/motor that more suitably renews, and in order to impel indoor-outdoor air exchange circulation, gets rid of indoor useless old flue gas, thereby improves the air quality of air-conditioned room, makes the air conditioner product open up new function, reach a new high.The brushless DC motor for air exchange in air conditioner of position-sensor-free belongs to the new function of air-conditioning, new product development, needs to solve the difficult problem of driving control system complexity.Through online information retrieval, there is not discovery patented product roughly the same.
The objective of the invention is at the deficiencies in the prior art, a kind of novel brushless DC motor for air exchange in air conditioner is provided, the design of employing position-sensor-free, simplify driving control system, make it not only simple in structure, reliable, and volume is little, particularly is applicable to the exploitation of household appliances.
For realizing such purpose, in the technical scheme of the present invention, adopt the motor outer rotor structure, permanent-magnetic clamp adopts Agglutinate neodymium-iron-boron Cheap rare-earth permanent magnetic material in the rotor, inwardly magnetize in the footpath, circumference is totally 12 utmost points, matches with 12 pole external-rotors, adopt three-phase 9 utmost points (9 groove) internal stator, 12 pole external-rotors and 9 utmost point internal stators generation stabilizing torque of working in coordination.The control circuit of motor adopts the commutation of three-phase 6 state position-sensor-free back-emfs to drive.
For understanding technical scheme of the present invention better, describe in further detail below in conjunction with accompanying drawing.
Fig. 1 is an overall structure schematic diagram of the present invention.
As shown in the figure, adopt the permanent-magnetic clamp 4 of Agglutinate neodymium-iron-boron to be inserted in the rotor casing 3, stator winding 6 directly is wound on the stator core 5, stator core 5 is enclosed within outside the stator axle sleeve 9 and with screw and is fixed on together on the fan shroud housing-plate 8, bearing 2 and helical spring 10 are inserted in stator axle sleeve 9 two ends respectively, armature spindle 1 is inserted in the bearing 2, and blocks with circlip for shaft 12, and driver circuit plate 7 is fixed on the fan shroud housing-plate 8.
Fig. 2 is an outer-rotor structure schematic diagram of the present invention.
As shown in the figure, motor of the present invention adopts outer-rotor structure, and permanent-magnetic clamp adopts Agglutinate neodymium-iron-boron Cheap rare-earth permanent magnetic material in the rotor, inwardly magnetizes in the footpath, and circumference is totally 12 utmost points.
Because the strong magnetic action of neodymium iron boron, magnetic field is stable in the rotor, does not produce eddy current, so the external rotor yoke need not adopt soft iron (10# steel) with silicon steel sheet, thereby has simplified technology, has reduced cost, is convenient to production and processing.
Fig. 3 is the structural principle schematic diagram that external stator of the present invention and internal rotor match.
As shown in the figure, match, adopt three-phase 9 utmost points (9 groove) internal stator with 12 pole external-rotors.Because the number of phases of stator winding is fewer, it is simpler then to drive (control) circuit, considers to make motor not have the dead band that the optimal selection of the stator number of phases is a three-phase.12 pole external-rotors and 9 utmost point internal stators generation stabilizing torque of working in coordination.
Fig. 4 is control circuit figure of the present invention.
The present invention adopts the commutation of three-phase 6 state position-sensor-free back-emfs to drive, and the driver module in the driver circuit is selected the TDA5141 brushless DC motor application-specific integrated circuit (ASIC) of being produced by PHILIPS for use.This is a kind of bipolar integrated circuit, be applicable to the three-phase full-wave brushless DC motor, needn't adopt Hall element or other rotor-position sensor, realize commutation control as the detection of rotor-position but use threephase stator winding back electromotive force zero-crossing during excitation not.TDA5141 inside has comprised driving stage, direct drive motors winding, thus save external device for power switching, driver circuit is very simplified, significantly reduce the volume of circuit board and reduce cost.
In the circuit, the 1st, 3,16 pin of driver module TDA5141 connect the input of internal stator three phase windings respectively, and the other end of three phase windings is connected on the 17th pin of driver module TDA5141.The 7th, 18 pin of driver module TDA5141, the negative pole of capacitor C 1 all are connected with the ground connection interface, and the 4th pin of driver module TDA5141 connects positive pole, the C utmost point of triode T2, the power supply+12V interface of capacitor C 1.The 8th pin of driver module TDA5141 connects the e utmost point of triode T2 and the positive pole of capacitor C 2.The 9th, 10,11,12 pin of driver module TDA5141 connect the end of capacitor C 3, C4, C5, C6 respectively, the other end of capacitor C 3, C4, C5, C6 and the e that meets negative pole, the triode T1 of back and the 13rd, 14 pin of driver module TDA5141, the C2 also ground connection that extremely links to each other.The two ends of resistance R 2 connect the b utmost point of triode T2 and the C utmost point of triode T1 respectively.The b utmost point of triode T1 is connected with resistance R 1, another termination control interface CON of resistance R 1.
The main composition of TDA5141 comprises phase change logic, drives output stage, back electromotive force comparator, operation independent amplifier (OTA).Three phase windings of brushless DC motor are connected to power stage output MOT1, MOT2 and MOT3, and each output has three kinds of possible states: high voltage (HIGH) attitude, and winding is received power positive end, has electric current to flow into; Low-voltage (LOW) attitude; Winding is received power supply ground end, has electric current to flow out; High-impedance state (F).To arbitrary phase winding, high-impedance state appears in the middle of high voltage attitude and the low-voltage attitude, and this moment, winding was in not energized condition, and the winding back electromotive force can be detected by the back electromotive force comparator in the circuit, and three back electromotive force comparator signal are selected by phase change logic.
In one-period, must there be two windings to be in high voltage attitude or low-voltage attitude respectively in three windings, have only a winding to be in high-impedance state, its back electromotive force zero-crossing is detected as rotor-position signal, the commutation of control winding.Calculate correct commutation time delay by self adaptation commutation time delay circuit by the motor load size.After the correct commutation of brushless DC motor winding, motor normally rotates.Drive output stage and also be provided with current-limiting circuit and overheating protection circuit.The commutation function of system is only rotated at motor and could be realized when the back produces certain back electromotive force amplitude.For electronic function is correctly started, this integrated circuit is provided with starting vibrator, produces the essential commutator pulse command signal of starting, allows motor start in the stepping motor mode.
Circuit input end has three ,+12V power supply, earth terminal GND and control end CON.When CON is high level, triode T1 conducting, triode T2 conducting then, like this+and the 12V power supply just adds on the integrated chip TDA5141 pin 4VMOT, and CAP-T1, CAP-ST, CAP-DC, electric capacity that CAP-CD connects has determined the starting time of chip internal, parameters such as communication time-delay timing, and the user can adjust these electric capacity to reach optimum performance.
When the circuit operate as normal, chip 1,3,16 pin are required voltage of P1, P2, P3 output brushless DC motor three-phase and correct phase sequence, and simultaneously, chip 17 pin connect the motor mid point, control motor powered gesture zero point, return on TDA5141 the 17th pin P0.
The characteristics of circuit of the present invention are: (1) utilizes motor phase winding back electromotive force that commutation signal is provided, and needn't settle rotor-position sensor specially; (2) be provided with starting circuit in; (3) optimize the commutation order, make under different motor and the load and all can work; (4) three-phase six steps all-wave commutation working method; (5) motor three phase winding star connection, Y connections have mid point to draw; (6) output current restriction and overtemperature protection; (7) utilize the counter electromotive force of motor signal to produce the frequency signal that accurately tests the speed.
The present invention adopts position-sensor-free back-emf commutation brushless DC motor, utilize the back-emf feedback that correct commutation signal is provided, guarantee that motor normally moves, three hall position sensors in three-phase brushless DC motor, being placed have usually not only been saved, reduced manufacturing cost, simultaneously simplify manufacturing process greatly, improved the reliability of production efficiency and use.
The driver module that the present invention adopts PHILIPS to make, six external device for power switching have been saved, make driving system structure simple, reliable, and reduced production cost, and noise is little, efficient is high, not only can be used for the exploitation of air conditioner new product, air conditioner in also can be used for producing, using increases the transformation that renews the wind function, or uses the driving of other similar load (as blower fan etc.).
In an embodiment of the present invention, axle adopts the processing of 45# steel and makes through heat treatment, the rotor casing adopts the 10# steel to be processed into, permanent-magnetic clamp adopts Agglutinate neodymium-iron-boron, be inserted in the rotor casing with tight fit, stator core adopts the cold rolling silicon steel sheet punching of 0.5mm repeatedly to adorn and makes through the fluid bowl insulation processing, stator winding adopts φ 19mm QZ-2 high strength enamelled wire, directly be wound on the stator core, stator core is enclosed within outside the stator axle sleeve of being processed into brass and with screw and is fixed on together on the fan shroud housing-plate, bearing (standard component) and helical spring are inserted in stator axle sleeve two ends respectively, armature spindle is inserted in the bearing, and block with circlip for shaft (standard component), the driver circuit plate is fixed on the fan shroud housing-plate with screw.
In the circuit, driver module is selected the TDA5141 brushless DC motor application-specific integrated circuit (ASIC) of being produced by PHILIPS for use, capacitor C 1, C2 are 10 μ F/25V, capacitor C 3, C4, C5, C6 are 103, triode T1 chooses 8050, triode T2 chooses 8550, and resistance R 1, R2 are 4.7K Ω, 1/4W.
Claims (2)
1, a kind of brushless DC motor for air exchange in air conditioner, it is characterized in that the structure that adopts 12 pole external-rotors and three-phase 9 utmost point internal stators to work in coordination, permanent-magnetic clamp (4) is inserted in the rotor casing (3), stator winding (6) directly is wound on the stator core (5), stator core (5) is enclosed within outside the stator axle sleeve (9) and is fixed on together on the fan shroud housing-plate (8), bearing (2) and helical spring (10) are inserted in stator axle sleeve (9) two ends respectively, armature spindle (1) is inserted in the bearing (2), and block with circlip for shaft (12), driver circuit plate (7) is fixed on the fan shroud housing-plate (8), control circuit adopts the commutation of three-phase 6 state position-sensor-free back-emfs to drive, and adopts driver module TDA5141.
2, as the said brushless DC motor for air exchange in air conditioner of claim 1, it is characterized in that the 1st of driver module TDA5141 in the said control circuit, 3,16 pin connect the input of internal stator three phase windings respectively, the other end of three phase windings is connected on the 17th pin of driver module TDA5141, the 7th of driver module TDA5141,18 pin, the negative pole of capacitor C 1 all is connected with the ground connection interface, the 4th pin connects the positive pole of capacitor C 1, the C utmost point of triode T2, power supply+12V interface, the 8th pin connects the e utmost point of triode T2 and the positive pole of capacitor C 2, the 9th, 10,11,12 pin connect capacitor C 3 respectively, C4, C5, the end of C6, capacitor C 3, C4, C5, the other end of C6 also meets back and the 13rd of driver module TDA5141,14 pin, the negative pole of C2, the e of triode T1 extremely links to each other and ground connection, the two ends of resistance R 2 connect the b utmost point of triode T2 and the C utmost point of triode T1 respectively, the b utmost point of triode T1 is connected with resistance R 1, another termination control interface CON of resistance R 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00116612A CN1274982A (en) | 2000-06-20 | 2000-06-20 | Brushless DC motor for air exchange in air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00116612A CN1274982A (en) | 2000-06-20 | 2000-06-20 | Brushless DC motor for air exchange in air conditioner |
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| CN1274982A true CN1274982A (en) | 2000-11-29 |
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| CN00116612A Pending CN1274982A (en) | 2000-06-20 | 2000-06-20 | Brushless DC motor for air exchange in air conditioner |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968251A (en) * | 2010-10-28 | 2011-02-09 | 上海平奉电气技术有限公司 | Method for controlling coil fan system of central air conditioner by computer program |
| CN102290948A (en) * | 2011-07-18 | 2011-12-21 | 深圳市双环全新机电股份有限公司 | Brushless motor with inner rotor |
| WO2015067011A1 (en) * | 2013-11-08 | 2015-05-14 | 何良远 | Rotor of brushless dc motor |
| CN108462271A (en) * | 2018-03-12 | 2018-08-28 | 宁勤顺 | The brushless direct current motor of included torsion slow start slow stop and its application |
-
2000
- 2000-06-20 CN CN00116612A patent/CN1274982A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968251A (en) * | 2010-10-28 | 2011-02-09 | 上海平奉电气技术有限公司 | Method for controlling coil fan system of central air conditioner by computer program |
| CN102290948A (en) * | 2011-07-18 | 2011-12-21 | 深圳市双环全新机电股份有限公司 | Brushless motor with inner rotor |
| WO2015067011A1 (en) * | 2013-11-08 | 2015-05-14 | 何良远 | Rotor of brushless dc motor |
| CN108462271A (en) * | 2018-03-12 | 2018-08-28 | 宁勤顺 | The brushless direct current motor of included torsion slow start slow stop and its application |
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