CN109120107B - Motor shaft current suppression device and method - Google Patents
Motor shaft current suppression device and method Download PDFInfo
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- CN109120107B CN109120107B CN201811278131.0A CN201811278131A CN109120107B CN 109120107 B CN109120107 B CN 109120107B CN 201811278131 A CN201811278131 A CN 201811278131A CN 109120107 B CN109120107 B CN 109120107B
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- induction coil
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- shaft current
- induction
- coil assembly
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- 230000001629 suppression Effects 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 10
- 230000006698 induction Effects 0.000 claims abstract description 93
- 238000004804 winding Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/0094—Structural association with other electrical or electronic devices
Abstract
A motor shaft current suppressing device includes an induction coil unit that induces a magnetic field generated by a shaft current and generates an induced electromotive force, and a power consumption component that consumes electric power generated in the induction coil unit. Through installing the induction coil subassembly between motor rotor and motor bearing, the produced magnetic field of change of axle current can produce induced current on the induction coil subassembly, through set up the power consumption components and parts on the induction coil subassembly, consumes the electric energy in the induction coil subassembly, consequently, the energy that the axle current produced can consume on the resistance, and then restrain the axle current in the source.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor shaft current suppression device and a motor shaft current suppression method.
Background
In the running process of the motor, the rotating shaft of the motor inevitably rotates in an incompletely symmetrical magnetic field due to the reasons that the air gap between the stator and the rotor is not uniform, the center of the rotating shaft is inconsistent with the center of the magnetic field and the like because of the combination seam of the stator core and the seam of the silicon steel sheets of the stator. Thus, an ac voltage is generated across the shaft, causing a shaft current to flow through the motor shaft.
At present, the conventional suppression measure is to adopt an insulating material to separate the position of the inner ring or the outer ring of the motor bearing, so that an open circuit is formed at the position of a shaft current path, thereby blocking the shaft current, and the conventional suppression measure has two defects: (1) shaft current flowing through the motor and the load bearing cannot be blocked, and electric erosion is caused to the load bearing; (2) for the shaft current flowing through the motor bearing, a capacitor is added on the path, the capacitor can only block the shaft current with relatively low frequency, and when the frequency is relatively high, the capacitive reactance of the capacitor is reduced, and the method cannot suppress the shaft current.
Disclosure of Invention
The invention aims to provide a motor shaft current suppression device and a motor shaft current suppression method which can solve the problems, and in order to achieve the purposes, the invention adopts the following technical scheme:
a motor shaft current suppressing device includes an induction coil unit that induces a magnetic field generated by a shaft current and generates an induced electromotive force, and a power consumption component that consumes electric power generated in the induction coil unit.
Furthermore, the induction coil assembly comprises a plurality of induction coils, the induction coils are uniformly distributed on the outer peripheral surface of the motor rotating shaft in a circumferential mode, and magnetic induction lines generated by shaft current are perpendicular to the induction coils. When the frequency of alternating voltage generated on the rotating shaft of the motor is constant, the magnetic induction line vertically penetrates through the induction coil, the magnetic flux penetrating through the induction coil is maximum, the average induced electromotive force generated on the induction coil is also maximum, and the suppression effect of shaft current is also best.
Further, the induction coils are connected in series with each other to form a closed loop, and the power consumption component is connected in series on the closed loop.
Further, the induction coil assembly further comprises a hoop which penetrates through the induction coil and hoops the induction coil on the outer wall of the rotating shaft.
Further, the induction coil assembly includes a solenoid and an induction coil, and the solenoid includes a winding wire having a winding direction perpendicular to the winding direction of the induction coil and passing through the induction coil.
Further, the solenoid and the induction coil are connected in series to form a closed loop, and the power consumption component is connected in series to the closed loop.
Further, the electricity consumption component is a resistor.
Further, the induction coil assembly is disposed between the motor rotor and the motor bearing.
Further, the motor is a direct current motor or an alternating current motor.
In addition, the invention also provides a motor shaft current suppression method, wherein an induction coil assembly is arranged on a motor rotating shaft, and a power consumption component is arranged in the induction coil assembly, the induction coil assembly can induce a magnetic field generated by shaft current and generate induced electromotive force, and the power consumption component can consume electric energy generated on the induction coil assembly.
By adopting the technical scheme, the motor has the advantages that in the running process of the motor, the two ends of the rotating shaft can generate an alternating voltage, so that the rotating shaft of the motor generates a variable shaft current, according to the ampere rule, the rotating shaft is equivalent to a powered straight wire, the shaft current generates a magnetic field, and the magnetic induction wire ring surrounds the rotating shaft. Because the voltage at two ends of the shaft is alternating voltage, the shaft current is changed, the magnetic field is also changed, the induction coil is arranged between the motor rotor and the motor bearing, the changed magnetic field generated by the shaft current can generate induction current on the induction coil, and the resistance is arranged on the coil to consume the electric energy in the induction coil, so the energy generated by the shaft current can be consumed on the resistance, and further the shaft current is suppressed from the source.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of the invention.
Fig. 2 is a schematic diagram of a second embodiment of the present invention.
Detailed Description
A motor shaft current suppression device comprises an induction coil assembly 1 for inducing a magnetic field generated by a shaft current and generating an induced electromotive force and a power consumption component for consuming electric energy generated on the induction coil assembly 1, wherein the power consumption component is preferably a resistor 2, and specifically comprises the following two embodiments:
the first embodiment is as follows:
as shown in fig. 1, the induction coil assembly 1 includes a plurality of induction coils 3 and a collar 4 passing through the induction coils 3 and tightening the induction coils 3 around the outer wall of a rotating shaft 5. The induction coils 3 are uniformly distributed on the peripheral surface of the motor rotating shaft 5 in a circumferential mode, and magnetic induction lines generated by shaft current are perpendicular to the induction coils 3. The induction coils 3 are connected in series with each other to form a closed loop, and the resistor 2 is connected in series on the closed loop. For convenience of illustration of the structure of the ferrule 4, part of the induction coil 3 is hidden in fig. 1.
Example two:
as shown in fig. 2, the induction coil assembly 1 includes a solenoid 6 and an induction coil 3, the solenoid 6 includes a winding wire having a winding direction perpendicular to the winding direction of the induction coil 3 and passing through the induction coil 3, the solenoid 6 is connected in series with the induction coil 3 to form a closed loop, and a resistor 2 is connected in series to the closed loop. Part of the induction coil 3 is hidden in fig. 2 for convenience of illustration of the structure of the solenoid 6.
The induction coil assembly 1 in the two embodiments is arranged between the motor rotor and the motor bearing, the changing magnetic field generated by the shaft current can generate induction current on the induction coil 3, the electric energy on the induction coil 3 is consumed through the resistor 2, and the shaft current on the rotating shaft 5 is further inhibited.
When the frequency of the alternating voltage generated on the rotating shaft 5 of the motor is constant, the magnetic induction line vertically passes through the induction coil 3, the magnetic flux passing through the induction coil 3 is maximum, the average induced electromotive force generated on the induction coil 3 is also maximum, and the suppression effect of the shaft current is also best.
The motor is a direct current motor or an alternating current motor. During operation of the motor, an alternating voltage is generated across the shaft 5 at a frequency related to the speed of rotation of the shaft 5, thereby generating a varying magnetic field.
The working principle of the invention is as follows: in the process of motor operation, an alternating voltage is generated at two ends of the rotating shaft 5, so that a variable shaft current is generated on the rotating shaft 5 of the motor, according to the ampere rule, the rotating shaft 5 is equivalent to an electrified straight wire, the shaft current generates a magnetic field, and the magnetic induction wire surrounds the rotating shaft 5. Because the voltage at two ends of the shaft is alternating voltage, the shaft current is changed, the magnetic field is also changed, the induction coil 3 is arranged between the motor rotor and the motor bearing, the changed magnetic field generated by the shaft current can generate induction current on the induction coil 3, and the resistor 2 is arranged on the coil to consume the electric energy in the induction coil 3, so the energy generated by the shaft current can be consumed on the resistor 2, and further the shaft current is restrained from the source.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications, combinations and variations may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A motor shaft current suppression device characterized in that: the motor comprises an induction coil assembly and a power consumption component, wherein the induction coil assembly is used for inducing a magnetic field generated by shaft current and generating induced electromotive force, and the power consumption component is used for consuming electric energy generated on the induction coil assembly; the induction coil assembly comprises a plurality of induction coils, the induction coils are uniformly distributed on the outer peripheral surface of the rotating shaft of the motor in a circumferential manner, and magnetic induction lines generated by shaft current are vertical to the induction coils; the induction coils are connected in series to form a closed loop, and the power consumption components are connected in series on the closed loop; the power consumption component is a resistor.
2. A motor shaft current suppressing device as defined in claim 1, wherein: the induction coil assembly further comprises a hoop sleeve which penetrates through the induction coil and hoops the induction coil on the outer wall of the rotating shaft.
3. A motor shaft current suppressing device as defined in claim 1, wherein: the induction coil assembly further includes a solenoid including a winding wire wound in a direction perpendicular to and passing through the induction coil.
4. A motor shaft current suppressing device as defined in claim 3, wherein: the solenoid and the induction coil are connected in series to form a closed loop, and the power consumption component is connected in series on the closed loop.
5. A motor shaft current suppressing device as defined in claim 1, wherein: the induction coil assembly is disposed between the motor rotor and the motor bearing.
6. A motor shaft current suppressing device as defined in claim 1, wherein: the motor is a direct current motor or an alternating current motor.
7. A motor shaft current suppressing method characterized by comprising: the motor comprises a motor shaft, an induction coil assembly, a power consumption component and a control circuit, wherein the induction coil assembly is arranged on the motor shaft, the induction coil assembly is internally provided with the power consumption component, the induction coil assembly can induce a magnetic field generated by shaft current and generate induced electromotive force, and the power consumption component can consume electric energy generated on the induction coil assembly; the induction coil assembly comprises a plurality of induction coils, the induction coils are uniformly distributed on the outer peripheral surface of the rotating shaft of the motor in a circumferential manner, and magnetic induction lines generated by shaft current are vertical to the induction coils; the induction coils are connected in series to form a closed loop, and the power consumption components are connected in series on the closed loop; the power consumption component is a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811278131.0A CN109120107B (en) | 2018-10-30 | 2018-10-30 | Motor shaft current suppression device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811278131.0A CN109120107B (en) | 2018-10-30 | 2018-10-30 | Motor shaft current suppression device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109120107A CN109120107A (en) | 2019-01-01 |
| CN109120107B true CN109120107B (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811278131.0A Active CN109120107B (en) | 2018-10-30 | 2018-10-30 | Motor shaft current suppression device and method |
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| Country | Link |
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| CN (1) | CN109120107B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51136101A (en) * | 1975-05-20 | 1976-11-25 | Mitsubishi Electric Corp | Shaft current preventor |
| JPS6096150A (en) * | 1983-10-31 | 1985-05-29 | Nishishiba Denki Kk | Axial current preventing device of rotary electric machine |
| DE19742622A1 (en) * | 1997-09-26 | 1999-04-08 | Siemens Ag | Method and device for monitoring shaft currents and shaft voltages in a generator shaft |
| DE20301956U1 (en) * | 2003-02-07 | 2004-06-17 | Ab Skf | Device for protecting a bearing of an electrical machine from a damaging electrical continuity |
| JP6608711B2 (en) * | 2016-01-15 | 2019-11-20 | 株式会社Ｓｏｋｅｎ | Rotating electric machine and stator |
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2018
- 2018-10-30 CN CN201811278131.0A patent/CN109120107B/en active Active
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| CN109120107A (en) | 2019-01-01 |
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Denomination of invention: A motor shaft current suppression device and method Effective date of registration: 20231215 Granted publication date: 20201113 Pledgee: Canton bank Limited by Share Ltd. Yangjiang branch Pledgor: ENGGA (YANGJIANG) ELECTRIC CO.,LTD. Registration number: Y2023980072238 |
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