CN210297471U - Structure for reducing voltage of driving type plastic package motor shaft of PWM inverter - Google Patents
Structure for reducing voltage of driving type plastic package motor shaft of PWM inverter Download PDFInfo
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- CN210297471U CN210297471U CN201921611261.1U CN201921611261U CN210297471U CN 210297471 U CN210297471 U CN 210297471U CN 201921611261 U CN201921611261 U CN 201921611261U CN 210297471 U CN210297471 U CN 210297471U
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Abstract
The utility model discloses a reduce structure of driving plastic envelope motor shaft voltage of PWM dc-to-ac converter relates to the motor field. In the existing PWM inverter driving type plastic package motor, the high-frequency switch of a power element can cause the change of common mode voltage to cause parasitic capacitance at each position in the motor, so that potential difference is generated between an inner ring and an outer ring of a bearing, an oil film of bearing lubricating grease is easy to damage, the bearing is damaged by electric corrosion, and the electric corrosion generated by the inner ring, the outer ring and balls is always a key factor influencing the service life of the motor. The utility model discloses a connect in order to realize the equipotential through electrically conductive between front end housing and rear end cap, be connected with electric capacity between electrically conductive and the stator core. The effective conduction between the front end cover, the rear end cover and the stator core is conveniently realized, the equipotential is formed, the capacitor is arranged between the end cover and the stator core, the proper capacitance is added, and finally, the external induction capacitance of the inner ring and the outer ring of the bearing is balanced, so that the shaft voltage is effectively reduced, the electric corrosion risk of the bearing is avoided, and the service life and the reliability of the motor are improved.
Description
Technical Field
The utility model relates to a motor field especially relates to a reduce structure of driving plastic envelope motor shaft voltage of PWM dc-to-ac converter.
Background
In the existing PWM inverter driving type plastic package motor, because the iron core is insulated from the front end cover and the rear end cover after the stator is plastically packaged, when the PWM inverter drives the motor, the high-frequency switch of a power element can cause the change of common-mode voltage. The common mode voltage induces parasitic capacitances throughout the interior of the motor, the presence of which causes a potential difference between the inner and outer rings of the bearing. The oil film thickness of the bearing grease is generally below 1 μm, and the insulation breakdown voltage is only 5V to more than ten V, so that the peak value of the shaft voltage exceeds the insulation breakdown voltage of the oil film of the bearing grease, the discharge current EDM generated in the bearing causes the bearing to be damaged by electric corrosion, and the electric corrosion generated between the inner ring and the outer ring and the balls is always a key factor influencing the service life of the motor.
The prior plastic package motor industry mainly adopts the technical scheme that a front end cover and a rear end cover are welded and conducted by using a conducting wire, or the front end cover and the rear end cover are bonded by using a conducting adhesive tape on the surface of a stator, so that the front end cover and the rear end cover form equal potential, and in addition, a rotor inner-outer iron core separation structure is adopted and insulating plastic is added in the middle to change the capacitance value of a rotor so as to solve the problem of balance of capacitance of an inner ring and an outer ring. However, the rotor is relatively complex in insulating structure, the installation size of the interference magnetic steel and the shaft is small, the plastic insulating layer cannot bear large torque, and in addition, the electrostatic capacity of the rotor cannot be reasonably adjusted because some high-speed low-torque motor rotors need to directly adopt the integral plastic magnetic ring, so that the application range of the motor is influenced. The present structure solves these problems well.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model and the technical task that provides are perfected and improved prior art scheme, provide a structure that reduces the drive plastic envelope motor shaft voltage of PWM dc-to-ac converter to effectively reduce motor shaft voltage as the purpose. Therefore, the utility model adopts the following technical scheme.
The utility model provides a reduce structure of drive plastic envelope motor shaft voltage of PWM inverter, the drive plastic envelope motor of PWM inverter including winding stator core, the insulating skeleton of stator core, rotor, front end housing and rear end cap, the bearing chamber of front end housing and rear end cap in be equipped with the bearing, winding stator core, insulating skeleton and front end cap pass through plastic envelope piece plastic envelope integrative, front end housing and rear end cap between connect in order to realize the equipotential through electrically conductive, electrically conductive and stator core between be connected with electric capacity. The effective conduction between the front end cover, the rear end cover and the stator core is conveniently realized, the equipotential is formed, the capacitor is arranged between the end cover and the stator core, the proper capacitance is added, and finally, the external induction capacitance of the inner ring and the outer ring of the bearing is balanced, so that the shaft voltage is effectively reduced, the electric corrosion risk of the bearing is avoided, and the service life and the reliability of the motor are improved.
As a preferable technical means: the conductive piece comprises an electric corrosion lead and a terminal connecting piece, one end of the electric corrosion lead is connected to the outer surface of the front end cover after an insulating skin is stripped, the other end of the electric corrosion lead is connected with the terminal connecting piece together with a pin on one side of the capacitor after the insulating skin is stripped, and the terminal connecting piece is electrically connected with the inner side wall of the rear end cover. The front end cover and the rear end cover can be electrically connected effectively through the electric corrosion lead and the terminal connecting piece.
As a preferable technical means: and the pin at the other side of the capacitor is fixedly connected to the outer circular surface of the stator core through a conductive connecting piece. The connection and fixation are convenient to operate, and the electric connection between the capacitor and the iron core is effectively realized.
As a preferable technical means: and an insulating tape is wound on the excircle surface of the stator core to cover the excircle of the stator core, the capacitor pin and the electric erosion wire. The plastic package material can be effectively prevented from entering during injection molding.
As a preferable technical means: the terminal connecting piece include first terminal and second terminal, first terminal be fixed in insulating skeleton on, first terminal and plastic envelope piece plastic envelope are integrative, first terminal exposes the plastic envelope piece towards one side part of second terminal, second terminal and first terminal be connected fixedly, be equipped with the bullet tongue on the second terminal, the inside wall of bullet tongue and rear end cap is connected through elasticity oppression mode electricity. The terminal connecting piece is divided into the first terminal and the second terminal, and the first terminal is in plastic package, so that the connection and assembly are facilitated, the structural stability is good, and the reliability is high.
As a preferable technical means: the electric corrosion lead is welded or riveted with the outer surface of the front end cover, and the other end of the electric corrosion lead and the pin at one side of the capacitor are welded or riveted with the first terminal. The connection mode has high reliability and is not easy to break.
As a preferable technical means: the first terminal and the second terminal are inserted, matched and welded and fixed. The assembly is convenient, the connection is reliable, and the disassembly of the rear end cover is convenient.
As a preferable technical means: the first terminal comprises a first pin, a second pin opposite to the first pin in direction and a connecting portion perpendicular to the first pin, a slot matched with the first pin is formed in the insulating framework, the second pin is matched with a jack formed in the second terminal, and a U-shaped groove is formed in the connecting portion. This simple structure, U type groove can effectively realize the fixed supplementary of being connected of wire and electric capacity pin on the connecting portion, and first participating in can be convenient fix the insulating skeleton to first terminal on, the second participates in the realization and the plug-in connection of second terminal.
As a preferable technical means: the first terminal and the second terminal are both formed by stamping and bending a single sheet of material. The manufacture is convenient and the cost is low.
As a preferable technical means: the capacitor is a ceramic capacitor; the conductive connecting piece is a double-sided conductive adhesive tape. The ceramic capacitor has the advantages of higher service temperature, large specific capacity, good moisture resistance and smaller dielectric loss, and can work in the internal environment of the motor for a long time. The double-sided conductive adhesive tape can be firmly bonded, ensures conduction and has high reliability.
Has the advantages that: the effective conduction between the front end cover, the rear end cover and the stator core is conveniently realized, the equipotential is formed, the capacitor is arranged between the end cover and the stator core, the proper capacitance is added, and finally, the external induction capacitance of the inner ring and the outer ring of the bearing is balanced, so that the shaft voltage is effectively reduced, the electric corrosion risk of the bearing is avoided, and the service life and the reliability of the motor are improved.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is another view-direction structure diagram of the present invention.
Fig. 4 is a schematic diagram of the connection of the electric corrosion wire, the first terminal and the second terminal of the present invention.
Fig. 5 is a schematic view of the first terminal structure of the present invention.
In the figure: 1-a stator core; 2-an insulating framework; 3-a rotor; 4-front end cover; 5-rear end cap; 6-capacitance; 7-a first terminal; 8-a second terminal; 9-electroerosion wire; 10-plastic packaging parts; 701-first pins; 702-a second pin; 703-a linker; 70301-U-shaped groove; 801-spring tongue.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1-5, a structure for reducing voltage of a driving type plastic package motor shaft of a PWM inverter, the driving type plastic package motor of the PWM inverter comprises a winding stator core 1), a stator core insulating framework 2, a rotor 3, a front end cover 4 and a rear end cover 5, bearings are arranged in bearing chambers of the front end cover 4 and the rear end cover 5, the winding stator core 1, the insulating framework 2 and the front end cover 4 are integrated by plastic package through a plastic package part 10, the front end cover 4 and the rear end cover 5 are connected through a conductive piece to realize equipotential, and a capacitor 6 is connected between the conductive piece and the stator core 1.
In order to realize the electric connection of the front end cover 4 and the rear end cover 5, the conductive piece comprises an electric corrosion lead wire 9 and a terminal connecting piece, one end of the electric corrosion lead wire 9 is connected to the outer surface of the front end cover 4 after an insulating skin is stripped, the other end of the electric corrosion lead wire is connected with the terminal connecting piece together with a pin at one side of the capacitor 6 after the insulating skin is stripped, and the terminal connecting piece is electrically connected with the inner side wall of the rear end cover. The electric connection of the front end cap 4 and the rear end cap 5 can be effectively realized through the electric corrosion lead 9 and the terminal connecting piece.
In order to realize the electric connection between the capacitor 6 and the iron core, the pin at the other side of the capacitor 6 is connected and fixed on the outer circular surface of the stator iron core 1 through a conductive connecting piece. The connection and fixation are convenient to operate, and the electric connection between the capacitor 6 and the iron core is effectively realized.
In order to prevent plastic package materials from entering during injection molding, an insulating tape is wound on the outer circle surface of the stator core 1 to cover the outer circle of the stator core 1, the pins of the capacitor 6 and the electric erosion wire 9. The plastic package material can be effectively prevented from entering during injection molding.
In order to facilitate connection and assembly, the terminal connecting piece comprises a first terminal 7 and a second terminal 8, the first terminal 7 is fixed on the insulating framework 2, the first terminal 7 and the plastic package part 10 are in plastic package, one side part of the first terminal 7 facing the second terminal 8 is exposed out of the plastic package part 10, the second terminal 8 is fixedly connected with the first terminal 7, the second terminal 8 is provided with a spring tongue 801, and the spring tongue 801 is electrically connected with the inner side wall of the rear end cover 5 in an elastic compression mode. The terminal connecting piece is divided into the first terminal 7 and the second terminal 8, and the first terminal 7 is in plastic package, so that the connection and assembly are facilitated, the structural stability is good, and the reliability is high.
For reliable connection, the electrolytic corrosion lead 9 is welded with the outer surface of the front end cover 4, and the other end of the electrolytic corrosion lead 9 and one side pin of the capacitor 6 are welded with the first terminal 7. The connection mode has high reliability and is not easy to break, and riveting can be adopted to replace the connection mode in the example.
For convenient assembly and firm connection, the first terminal 7 is injection-molded in the stator, and the second pin 702 of the rear protruding part is inserted and matched with the second terminal 8 and fixed by welding. The assembly is convenient, the connection is reliable, and the disassembly of the rear end cover 5 is convenient.
In order to realize the connection structure of the first terminal 7, the first terminal 7 includes a first pin 701, a second pin 702 opposite to the first pin 701, and a connection portion 703 perpendicular to the first pin 701, the insulating frame 2 is provided with a slot matching with the first pin 701, the second pin 702 matches with a jack provided on the second terminal 8, and the connection portion 703 is provided with a U-shaped groove 70301. This simple structure, U type groove 70301 can effectively realize the fixed supplementary of being connected to wire and electric capacity 6 pin on connecting portion 703, and first participating in 701 can be convenient fix first terminal 7 to insulating skeleton 2 on, and the second participates in 702 and realizes being connected with the grafting of second terminal 8.
In order to reduce the cost, the first terminal 7 and the second terminal 8 are both formed by stamping and bending a single piece of sheet material. The manufacture is convenient and the cost is low.
During assembly, one end of an electroerosion lead 9 is stripped of an insulating skin and then is connected and conducted with the front end cover 4 through spot welding, the other end of the electroerosion lead is stripped of the insulating skin and then is inserted into a U-shaped groove 70301 of a first terminal 7 together with a pin at one side of a ceramic capacitor 6, and then is welded and conducted with the first terminal 7, the first terminal 7 is inserted into a slot of a winding stator core insulating framework 2 for fixation, a section of double-sided conductive copper foil adhesive tape is used for covering and bonding the pin at the other side of the ceramic capacitor 6 and the excircle of a stator core 1 firmly to ensure conduction, and then the electroerosion lead 9 and the electroerosion lead are wound and covered with the insulating adhesive tape at the outside to prevent plastic package materials from entering during injection molding to form the stator core 1 with the winding with the front end cover 4, and then is injected into a plastic package stator, a part of the first terminal 7 is exposed out of the plastic package, after the rotor 3 and other components are installed, the rear end cover 5 is pressed, the inner side wall of the rear end cover 5 is in contact conduction with the raised tongues of the second terminals 8, and a plastic-sealed EC motor complete machine is formed. ' Qiyi
The effective conduction between the front end cover 4, the rear end cover 5 and the stator core 1 is realized, the equipotential is formed, the capacitor 6 is arranged between the end cover and the stator core 1, a proper amount of capacitance is added, and finally, the external induction capacitance of the inner ring and the outer ring of the bearing is balanced, so that the shaft voltage is effectively reduced, the bearing electric corrosion risk is avoided, and the service life and the reliability of the motor are improved.
In this example, the capacitor 6 is a ceramic capacitor; the conductive connecting piece is a double-sided conductive copper foil tape.
The structure for reducing the voltage of the motor shaft of the driving plastic package of the PWM inverter shown in fig. 1-5 is a specific embodiment of the present invention, which embodies the outstanding substantial features and the significant improvements of the present invention, and can modify the motor shaft equally in the aspects of shape, structure, etc. according to the practical needs of use, all within the scope of protection of the present solution.
Claims (10)
1. The utility model provides a reduce structure of drive plastic envelope motor shaft voltage of PWM inverter, the plastic envelope motor including winding stator core (1), stator core insulation frame (2), rotor (3), front end housing (4) and rear end cap (5), the bearing chamber of front end housing (4) and rear end cap (5) in be equipped with the bearing, winding stator core (1), insulation frame (2) and front end housing (4) through plastic envelope piece (10) plastic envelope integrative, its characterized in that: the front end cover (4) and the rear end cover (5) are connected through a conductive piece to realize equipotential, and a capacitor (6) is connected between the conductive piece and the stator core (1).
2. The structure of claim 1 for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package, wherein: the conductive piece comprises an electric corrosion lead (9) and a terminal connecting piece, one end of the electric corrosion lead (9) is connected to the outer surface of the front end cover (4) after an insulating skin is stripped, the other end of the electric corrosion lead is connected with the terminal connecting piece together with a pin on one side of the capacitor (6) after the insulating skin is stripped, and the terminal connecting piece is electrically connected with the inner side wall of the rear end cover (5).
3. The structure of claim 2 for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package, wherein: and the pin at the other side of the capacitor (6) is fixedly connected to the outer circular surface of the stator core (1) through a conductive connecting piece.
4. The structure of claim 3 for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package, wherein: and an insulating adhesive tape is wound on the excircle surface of the stator core (1) to cover the excircle of the stator core (1), the pin of the capacitor (6) and the electrolytic corrosion wire (9).
5. The structure of claim 4 for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package, wherein: the terminal connecting piece include first terminal (7) and second terminal (8), first terminal (7) be fixed in insulating skeleton (2) on, first terminal (7) and plastic envelope piece (10) plastic envelope are integrative, first terminal (7) expose plastic envelope piece (10) towards one side part of second terminal (8), second terminal (8) be connected fixedly with first terminal (7), be equipped with on second terminal (8) and play tongue (801), the inside wall of bullet tongue (801) and rear end cap (5) is connected through the elasticity mode of oppression.
6. The structure of claim 5 for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package, wherein: the electric corrosion lead (9) is welded or riveted with the outer surface of the front end cover (4), and the other end of the electric corrosion lead (9) and a pin at one side of the capacitor (6) are welded or riveted with the first terminal (7).
7. The structure of claim 6, wherein the structure for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package is characterized in that: the first terminal (7) and the second terminal (8) are matched in an inserted mode and are fixed in a welded mode.
8. The structure of claim 7 for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package, wherein: the first terminal (7) comprises a first pin (701), a second pin (702) opposite to the first pin (701) in direction and a connecting part (703) perpendicular to the first pin (701), a slot matched with the first pin (701) is formed in the insulating framework (2), the second pin (702) is matched with a jack formed in the second terminal (8), and a U-shaped groove (70301) is formed in the connecting part (703).
9. The structure of claim 8 for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package, wherein: the first terminal (7) and the second terminal (8) are both formed by stamping and bending a single piece of sheet material.
10. The structure of claim 6, wherein the structure for reducing the voltage of the motor shaft of the PWM inverter driving type plastic package is characterized in that: the capacitor (6) is a ceramic capacitor (6); the conductive connecting piece is a double-sided conductive adhesive tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921611261.1U CN210297471U (en) | 2019-09-25 | 2019-09-25 | Structure for reducing voltage of driving type plastic package motor shaft of PWM inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921611261.1U CN210297471U (en) | 2019-09-25 | 2019-09-25 | Structure for reducing voltage of driving type plastic package motor shaft of PWM inverter |
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| CN210297471U true CN210297471U (en) | 2020-04-10 |
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| CN201921611261.1U Active CN210297471U (en) | 2019-09-25 | 2019-09-25 | Structure for reducing voltage of driving type plastic package motor shaft of PWM inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601454A (en) * | 2019-09-25 | 2019-12-20 | 卧龙电气驱动集团股份有限公司 | Structure for reducing voltage of driving type plastic package motor shaft of PWM inverter |
| WO2022067696A1 (en) * | 2020-09-30 | 2022-04-07 | 卧龙电气驱动集团股份有限公司 | Structure for reducing shaft voltage of pwm inverter driven plastic-packaged motor |
-
2019
- 2019-09-25 CN CN201921611261.1U patent/CN210297471U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601454A (en) * | 2019-09-25 | 2019-12-20 | 卧龙电气驱动集团股份有限公司 | Structure for reducing voltage of driving type plastic package motor shaft of PWM inverter |
| WO2022067696A1 (en) * | 2020-09-30 | 2022-04-07 | 卧龙电气驱动集团股份有限公司 | Structure for reducing shaft voltage of pwm inverter driven plastic-packaged motor |
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