CN103956878A - Two-pole brushless direct-current motor position sensor and detection method thereof - Google Patents
Two-pole brushless direct-current motor position sensor and detection method thereof Download PDFInfo
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- CN103956878A CN103956878A CN201410215444.7A CN201410215444A CN103956878A CN 103956878 A CN103956878 A CN 103956878A CN 201410215444 A CN201410215444 A CN 201410215444A CN 103956878 A CN103956878 A CN 103956878A
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Abstract
Provided are a two-pole brushless direct-current motor position sensor and a detection method thereof. In a brushless direct-current motor control system, a Hall sensor is small in size, difficult to install and large in output signal errors. A photoelectric encoder cannot be applied to the poor environment which has vibration severity, is damp and has oil stain and dust. The two-pole brushless direct-current motor position sensor comprises a casing (3), the casing is installed on a support (9), the top of the casing is provided with an end cover (8), a circuit board (7) is installed on the lower surface of the end cover, a hollow shaft (1) penetrates the position of a lower opening of the casing, a bearing (2) is installed between the inner surface of the casing and the hollow shaft, the upper end of the hollow shaft is sleeved with two-pole annular magnetic steel (4), the outer portion of the two-pole annular magnetic steel is sleeved with an annular iron core (5), a groove is formed between the two-pole annular magnetic steel and the annular iron core, three switch Hall sensors (6) are installed in the groove, and a power supply circuit (10) is integrated on the circuit board and connected with the switch Hall sensors. The two-pole brushless direct-current motor position sensor and the detection method are used for brushless direct-current motor phase change position detection.
Description
technical field:
the present invention relates to a kind of 2 pole brushless DC motor position sensor and detection methods thereof.
background technology:
in brushless DC motor control system, conventional position transducer has Hall element and photoelectric encoder.Hall element volume is little, low price, but because it installs difficulty, output signal error is large, has limited its use.Photoelectric encoder is a kind of Electric Machine Control transducer that collects light, mechanical, electrical one.Because the shortcoming of himself, can't be applied to the adverse circumstances that vibration is violent, moist, have greasy dirt and dust; Because photoelectric device is not long useful life, the useful life of having limited photoelectric encoder; Manufacturing process complexity causes the expensive of photoelectric encoder.Above shortcoming, has limited the range of application of photoelectric encoder greatly, cannot be used in adverse circumstances and particular surroundings, the fields such as such as space flight.
summary of the invention:
the object of this invention is to provide a kind of 2 pole brushless DC motor position sensor and detection methods thereof.
above-mentioned object realizes by following technical scheme:
a kind of 2 pole brushless DC motor position sensors, its composition comprises: shell, described cover top portion has end cap, described end cap lower surface mounting circuit boards, the end opening place of described shell penetrates hollow shaft, between described inner surface of outer cover and described hollow shaft, bearing is installed, described hollow shaft upper end is set with 2 utmost point annular magnetic steels, the described outside suit of 2 utmost point annular magnetic steels annular core, between 2 described utmost point annular magnetic steels and described annular core, form groove, three switch Hall transducers are installed in described groove; Wherein, integrated power supply circuits on described circuit board, described power supply circuits connect described switch Hall transducer.
2 described pole brushless DC motor position sensors, described switch Hall transducer is vertically placed on space on described circuit board, phase difference between switch Hall transducer described in three is 120 degree electrical degrees, and the mechanical angle of described switch Hall transducer vertical welding differs 60 °.
utilize a detection method for above-mentioned 2 pole brushless DC motor position sensors,
the first step, because the connecting axle of 2 utmost point annular magnetic steels is hollow shaft, is directly sleeved on the outer end of described hollow shaft on the armature spindle of motor, and is fixed; By 2 utmost point annular magnetic steels of inner end outside suit of described hollow shaft;
second step, the electrical degree that switch Hall transducer is spent with interval 120 on the same circumference of circuit board is arranged, switch Hall transducer senses the square wave field that 2 utmost point annular magnetic steels produce, and be converted into and represent the voltage signal of armature spindle position, realize and will differ the output of three-phase brushless dc motor commutation signal of 120 degree electrical degrees; Meanwhile, the described outside suit of 2 utmost point annular magnetic steels annular core is adjusted to the magnetic field of its generation, to control the error of described switch Hall sensor sensing magnetic-field component.
the detection method of 2 described pole brushless DC motor position sensors, switch Hall sensor surface is vertical with 2 utmost point annular magnetic steel outer surface normals.
the detection method of 2 described pole brushless DC motor position sensors, 2 described pole brushless DC motor position sensors are designed to full-closed structure, and shell itself is exactly a magnetic shielding device, masks the interference of external magnetic field to sensor internal magnetic field, position.
beneficial effect:
1. the present invention is set with 2 utmost point annular magnetic steels by hollow shaft upper end, the outside suit of 2 utmost point annular magnetic steels annular core, and three switch Hall transducers installing between 2 utmost point annular magnetic steels and annular core form checkout gear; By 2 utmost point annular magnetic steels and a pair of utmost point square wave field of generation of radial magnetizing, for the position probing of a pair of pole brushless DC motor, and provide 2 pole brushless DC motor commutation signals.There is advantage simple in structure, easy for installation, the cost of the transducer that can greatly dip, production cost is compared with the about reduction by 20% of equal accuracy photoelectric encoder.
2. the present invention adopts magnet structure, has saved photoelectric device, compared with photoelectric encoder, has greatly extended useful life.And it is strong that it adapts to adverse circumstances abilities, owing to adopting magnet structure, violent to vibrating, moist, to have greasy dirt and dust adverse circumstances adaptable, has expanded the range of application of position transducer.
brief description of the drawings:
accompanying drawing 1 is structural representation of the present invention.
accompanying drawing 2 is enclosure winding diagrams of the present invention.
accompanying drawing 3 is the iron core relating to of the present invention and 2 utmost point annular magnetic steel locations drawing.
accompanying drawing 4 is the switch Hall sensor phase graphs of a relation that the present invention relates to.In figure, 15,16,17 are respectively U, V, W three-phase hall signal waveform.
embodiment:
embodiment 1:
a kind of 2 pole brushless DC motor position sensors, its composition comprises: shell 3, described shell 3 is arranged on support 9, described cover top portion has end cap 8, described end cap lower surface mounting circuit boards 7, the end opening place of described shell penetrates hollow shaft 1, between described inner surface of outer cover and described hollow shaft, bearing 2 is installed, described hollow shaft upper end is set with 2 utmost point annular magnetic steels 4, the described outside suit of 2 utmost point annular magnetic steels annular core 5, between 2 described utmost point annular magnetic steels and described annular core, form groove, three switch Hall transducers 6 are installed in described groove, wherein, integrated power supply circuits 10 on described circuit board, described power supply circuits connect described switch Hall transducer.
on the circuit board of described enclosure, described power supply circuits are 5V power supply, described 5V power supply connects described switch Hall transducer and three pull-up resistors 11, described pull-up resistor connects described switch Hall transducer, described pull-up resistor also connects respectively motor U phase position signal 12, motor V phase position signal 13 and motor W phase position signal 14, and described shell also connects power supply ground 15.
2 described utmost point annular magnetic steels are radial magnetizing, for generation of a pair of utmost point square wave field, are applicable to the position probing of a pair of pole brushless DC motor.
described shell adopts permeability magnetic material, the magnetic interference of isolating exterior environment.
embodiment 2:
according to 2 pole brushless DC motor position sensors described in embodiment 1, described switch Hall transducer is vertically placed on space on described circuit board, phase difference between switch Hall transducer described in three is 120 degree electrical degrees, and the mechanical angle of described switch Hall transducer vertical welding differs 60 °.
embodiment 3:
utilize a detection method for above-mentioned 2 pole brushless DC motor position sensors,
the first step, because the connecting axle of 2 utmost point annular magnetic steels is hollow shaft, is directly sleeved on the outer end of described hollow shaft on the armature spindle of motor, and is fixed; By 2 utmost point annular magnetic steels of inner end outside suit of described hollow shaft;
second step, the electrical degree that switch Hall transducer is spent with interval 120 on the same circumference of circuit board is arranged, switch Hall transducer senses the square wave field that 2 utmost point annular magnetic steels produce, and be converted into and represent the voltage signal of armature spindle position, realize and will differ the output of three-phase brushless dc motor commutation signal of 120 degree electrical degrees; Meanwhile, the described outside suit of 2 utmost point annular magnetic steels annular core is adjusted to the magnetic field of its generation, to control the error of described switch Hall sensor sensing magnetic-field component.
embodiment 4:
according to the detection method of 2 pole brushless DC motor position sensors described in embodiment 3, switch Hall sensor surface is vertical with 2 utmost point annular magnetic steel outer surface normals.
embodiment 5:
according to the detection method of 2 pole brushless DC motor position sensors described in embodiment 3 or 4,2 described pole brushless DC motor position sensors are designed to full-closed structure, shell itself is exactly a magnetic shielding device, masks the interference of external magnetic field to sensor internal magnetic field, position.
Claims (5)
1. a pole brushless DC motor position sensor, its composition comprises: shell, it is characterized in that: described cover top portion has end cap, described end cap lower surface mounting circuit boards, the end opening place of described shell penetrates hollow shaft, between described inner surface of outer cover and described hollow shaft, bearing is installed, described hollow shaft upper end is set with 2 utmost point annular magnetic steels, the described outside suit of 2 utmost point annular magnetic steels annular core, between 2 described utmost point annular magnetic steels and described annular core, form groove, three switch Hall transducers are installed in described groove; Wherein, integrated power supply circuits on described circuit board, described power supply circuits connect described switch Hall transducer.
2. 2 pole brushless DC motor position sensors according to claim 1, it is characterized in that: described switch Hall transducer is vertically placed on space on described circuit board, phase difference between switch Hall transducer described in three is 120 degree electrical degrees, and the mechanical angle of described switch Hall transducer vertical welding differs 60 °.
3. a detection method of utilizing above-mentioned 2 pole brushless DC motor position sensors, is characterized in that:
The first step, because the connecting axle of 2 utmost point annular magnetic steels is hollow shaft, is directly sleeved on the outer end of described hollow shaft on the armature spindle of motor, and is fixed; By 2 utmost point annular magnetic steels of inner end outside suit of described hollow shaft;
Second step, the electrical degree that switch Hall transducer is spent with interval 120 on the same circumference of circuit board is arranged, switch Hall transducer senses the square wave field that 2 utmost point annular magnetic steels produce, and be converted into and represent the voltage signal of armature spindle position, realize and will differ the output of three-phase brushless dc motor commutation signal of 120 degree electrical degrees; Meanwhile, the described outside suit of 2 utmost point annular magnetic steels annular core is adjusted to the magnetic field of its generation, to control the error of described switch Hall sensor sensing magnetic-field component.
4. the detection method of 2 pole brushless DC motor position sensors according to claim 3, is characterized in that: switch Hall sensor surface is vertical with 2 utmost point annular magnetic steel outer surface normals.
5. according to the detection method of 2 pole brushless DC motor position sensors described in claim 3 or 4, it is characterized in that: 2 described pole brushless DC motor position sensors are designed to full-closed structure, shell itself is exactly a magnetic shielding device, masks the interference of external magnetic field to sensor internal magnetic field, position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410215444.7A CN103956878A (en) | 2014-05-21 | 2014-05-21 | Two-pole brushless direct-current motor position sensor and detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410215444.7A CN103956878A (en) | 2014-05-21 | 2014-05-21 | Two-pole brushless direct-current motor position sensor and detection method thereof |
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| CN103956878A true CN103956878A (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410215444.7A Pending CN103956878A (en) | 2014-05-21 | 2014-05-21 | Two-pole brushless direct-current motor position sensor and detection method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451928A (en) * | 2016-08-31 | 2017-02-22 | 江苏大电机电有限公司 | Permanent magnet brushless direct current motor equipped with magnetic encoder |
| CN113791261A (en) * | 2021-09-28 | 2021-12-14 | 国网江苏省电力有限公司泰州供电分公司 | TMR-based contactless stranded wire current detection method |
-
2014
- 2014-05-21 CN CN201410215444.7A patent/CN103956878A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106451928A (en) * | 2016-08-31 | 2017-02-22 | 江苏大电机电有限公司 | Permanent magnet brushless direct current motor equipped with magnetic encoder |
| CN113791261A (en) * | 2021-09-28 | 2021-12-14 | 国网江苏省电力有限公司泰州供电分公司 | TMR-based contactless stranded wire current detection method |
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Application publication date: 20140730 |