Grounding carbon brush and position sensor combination assembly for automobile high-voltage driving motor

Abstract

The utility model discloses a grounding carbon brush and position sensor combination assembly for an automobile high-voltage driving motor, which comprises a main shell and is characterized in that the left end of the main shell is an external connector, a connector insert is arranged in the external connector, a plurality of bolt mounting holes are arranged at the edge of the main shell, the bolt mounting holes at the left end and the right end of the main shell are connected with a brush carrier, and the brush carrier is connected with a motor. A carbon brush assembly is arranged in the brush carrier, a circular groove is formed in the main shell, and a movable carbon brush protection plate is clamped in the circular groove. Certain electronic devices are arranged between the grounding carbon brush connecting shaft and the ground and used for reducing common-mode voltage on the shaft, and the devices and the eddy current sensor share one PCB. Before the carbon brush assembly is installed, the head of the carbon brush body is fixed in the brush box through the carbon brush protection plate, an operator does not need to make contact with the carbon brush body during installation, when the assembly is installed, a motor shell can press the carbon brush protection plate in place, the carbon brush body automatically pops out to make contact with a shaft, and the failure hidden danger caused by installation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of high -voltage drive motor and drive assembly for vehicle, concretely is a kind of ground carbon brush and position sensor combination assembly for automobile high -voltage drive motor. BACKGROUND

[0002] Modern vehicle new energy high -voltage drive motor is generally permanent magnet synchronous motor with special high -voltage control circuit, and the working principle based on control circuit can cause certain shaft voltage between the shaft of motor and the shell (ground) when motor works, and the shaft voltage can form loop through shaft, bearing, motor shell and generate shaft current in loop, and shaft current can cause irreversible damage to bearing raceway, steel ball and other, make bearing produce abnormal sound and other early failure, and bearing failure caused by shaft current accounts for a large proportion of current vehicle drive motor, and with the continuous improvement of motor voltage and speed, shaft voltage is more and more big, and more effective, reliable, economical technical scheme is needed to solve this problem.

[0003] Current mainstream several shaft current technical schemes have carbon fiber ring (reference background patent "conductive ring and motor", application publication number:CN218386131U);Sacrificial bearing (reference background patent "motor rotor, motor and vehicle", application publication number:CN112701824 A);And carbon brush / carbon rod structure (reference background patent "carbon brush assembly for motor shaft current grounding and its mounting structure", application publication number:CN11614191A), in these ways, from cost and structure complexity, reliability etc. Carbon brush / carbon rod structure is superior in cost, maintenance, reliability etc. But still has certain shortcomings.

[0004] Modern vehicle new energy high -voltage drive motor must be equipped with rotor angle position sensor based on the principle of motor control for real -time monitoring the relative angle relationship between rotor magnetic pole and stator coil, and the position sensor generally used at present is generally rotary transformer, divided into coil part, rotor part and connector part etc., and rotary transformer has the shortcomings of high installation requirement, complex structure, precision parts are easy to be damaged, signal is analog signal and needs to be decoded and converted, therefore, in recent years, a new type of position sensor using eddy current principle to collect rotor position signal (reference background patent "angle position sensor", application publication number CN113008130A) appears, compared with rotary transformer, it has the advantages of high detection precision, small size and low cost, but from the installation mode, the degree of integration etc. Compared with rotary transformer, it has not been improved, and still needs to be installed in motor, and it is more troublesome to use bolt fastening. UTILITY MODEL CONTENTS

[0005] Based on this, the utility model discloses a purpose is to provide a kind of automobile high-pressure drive motor ground carbon brush and position sensor combination assembly, to solve the problem mentioned in above background art.

[0006] Technical scheme as follows: a kind of automobile high-pressure drive motor ground carbon brush and position sensor combination assembly, including main casing, it is characterized in that, the left end of main casing is external connector, its inside is provided with connector insert, the edge of main casing is equipped with a plurality of bolt mounting holes, the bolt mounting hole of left and right ends is connected with brush holder, carbon brush assembly is equipped in the brush holder, round groove is equipped in main casing, the movable carbon brush guard is engaged in round groove, PCB board is equipped on main casing, main control circuit, internal connector, electric eddy current coil, grounding device are equipped on PCB board.

[0007] Further, main casing is connected with motor, and sealing rubber strip is arranged between main casing and motor bottom shell.

[0008] Further, the sealing rubber strip is bonded with the main casing by means of point gluing or liquid silicone process, and surrounds the upper edge of the main casing.

[0009] Further, the carbon brush guard is composed of a carbon rod sleeve, a braid wire and a spring, the carbon rod and the braid wire are integrally formed, the sleeve is sleeved on the braid wire, and the spring is sleeved on the sleeve.

[0010] Further, the motor rotating shaft can be deeply inserted into the round groove of the main casing to contact the carbon rod, and the motor stator temperature sensor circuit can be led out to the outside of the motor through the internal connector, the main control circuit and the external connector, so as to form a complete circuit transmission.

[0011] Further, the main casing is installed in the cavity sealing part of the motor bottom shell, and the outer end of the main casing is provided with a packaging cover covering the internal elements of the main casing.

[0012] In summary, the utility model mainly has the following beneficial effects:

[0013] 1. The assembly has both shaft grounding carbon brush and electric eddy current sensor, which are completely integrated and share key components (PCB board and main casing); the installation of the previous two components can be completed at one time;

[0014] 2. The assembly is installed outside the motor and has waterproof and dustproof properties; the assembly has a 4-pin connector facing the inside of the motor for connecting the temperature sensor on the stator coil; the assembly has a 10-14-pin connector facing the outside of the motor for connecting the wire harness of the motor controller; therefore, the mechanism of penetrating the cylinder or combining the connector is omitted, and the assembly has the function of leading the wire harness out of the outside;

[0015] 3. Ground carbon brush connecting shaft and ground will be arranged certain electronic devices for reducing the common mode voltage on the shaft, these devices with eddy current sensor share a PCB board; carbon brush assembly before installation carbon brush body head is fixed by carbon brush guard in the brush box, when installing operator does not need to contact the carbon brush body, the assembly is installed, the motor housing will press the carbon brush guard in place, the carbon brush body is automatically ejected and contacted with the shaft, avoid the failure caused by installation hidden trouble. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is overall structure schematic view of the present application;

[0017] Figure 2 It is shaft head structure schematic view of the present application;

[0018] Figure 3 It is internal structure diagram of the present application;

[0019] Figure 4 It is shell structure schematic view of the present application;

[0020] Figure 5 It is shell schematic view after reversing of the present application;

[0021] Figure 6 It is internal schematic view of the shell after reversing of the present application.

[0022] In the figure: 1-main shell;

[0023] 2-external connector;

[0024] 3-connector insert;

[0025] 4-mounting hole;

[0026] 5-brush holder;

[0027] 50-square groove;

[0028] 7-carbon brush guard;

[0029] 8-PCB board;

[0030] 9-main control circuit;

[0031] 10-internal connector;

[0032] 11-eddy current coil;

[0033] 12-ground device;

[0034] 13-sealing rubber strip;

[0035] 14-carbon rod;

[0036] 15-sleeve;

[0037] 16 - braid;

[0038] 17 - spring;

[0039] 100 - package cover;

[0040] 101 - shaft head. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as a limitation on the utility model.

[0042] The embodiments will be described below according to the overall structure of the utility model.

[0043] Referring to Figures 1-6 A ground carbon brush and position sensor combined assembly for a high-voltage driving motor of an automobile comprises a main shell 1, the left end of the main shell 1 is an external connector 2, the internal part of the connector 2 is provided with a connector insert 3, the edge of the main shell 1 is provided with a plurality of bolt mounting holes 4, the bolt mounting holes 4 at the left and right ends are connected with a brush holder 5, the brush holder 5 is provided with a carbon brush assembly, the carbon brush guard 7 is arranged at the middle position before installation, the carbon brush body is blocked by the structure on the carbon brush guard 7 and cannot be ejected; after installation is completed, the carbon brush guard 7 is lifted by the corresponding structure in the shell and arranged at the top position, the carbon brush body can be ejected, the main shell 1 is provided with a circular groove, the circular groove is provided with a movable carbon brush guard 7, the main shell 1 is provided with a PCB 8, the PCB 8 can be embedded into the main shell 1, the PCB 8 is provided with a main control circuit 9, an internal connector 10, an eddy current coil 11 and a grounding device 12.

[0044] Further, the main shell 1 is connected with a motor, the main shell 1 and the bottom shell of the motor are provided with a sealing rubber strip 13, the sealing rubber strip 13 is bonded together with the main shell 1 by using a point bonding or liquid silicone process, and the sealing rubber strip 13 surrounds the upper edge of the main shell 1.

[0045] Further, the carbon brush guard 7 is composed of a carbon rod 14, a sleeve 15, a braided wire 16 and a spring 17, the carbon rod 14 and the braided wire 16 are integrally formed, the sleeve 15 is sleeved on the braided wire 16, and the spring 17 is sleeved on the sleeve 15. The carbon brush assembly is arranged in the corresponding square groove 50 on the main shell 1, the tail end of the carbon brush braided wire 16 is connected to the corresponding hole position on the carbon brush insert through resistance welding or tin welding, the welded part is installed with the carbon brush cover and filled with structural glue for protection, meanwhile, the assembly and combination position of the carbon brush cover and the main shell 1 is sealed, the control circuit is arranged in the corresponding position of the main shell 1, the pin position on the control circuit is matched with the pin position on the connector insert 3, the carbon brush insert and the grounding insert through tin welding connection, after welding, the surface of the control PCB 8 should be completely covered and packaged by using epoxy resin or other types of glue, so as to be more firm. The motor rotating shaft can be deeply inserted into the circular groove of the main shell 1 and contact with the carbon rod 14, the motor rotating shaft contacts with the carbon rod 14 of the carbon brush, and a loop is formed through the carbon rod 14, the braided wire 16, the carbon brush insert, the grounding device 12 and the grounding insert and the motor shell, so as to reduce the shaft voltage and conduct the shaft current. The motor shaft head 101 should be processed or installed with the corresponding induced structure of the rotor magnetic pole structure, which is used to form a position sensor together with the eddy current coil 11. The internal connector is used to connect the motor temperature sensor and the like, and the above together with the control PCB 8, the connector insert 3 and the external connector 2 are transmitted to the motor controller.

[0046] The main shell 1 is installed in the cavity sealing part of the motor bottom shell, the outer end of the main shell 1 is provided with a packaging cover 100, the packaging cover 100 covers the internal elements of the main shell 1, and the carbon brush assembly, the carbon brush guard 7, the eddy current PCBA and other parts are welded together by using the ultrasonic welding process and the brush holder 5 after being tested, which belongs to the final packaging.

[0047] The shaft head 101 is surrounded by a cavity sealing mode, and the whole sensor is in contact with the shaft head 101 through bolts and is installed in the sealing cavity around the shaft head 101.

[0048] Although the embodiments of the utility model have been shown and described, the specific embodiments are only an explanation of the utility model, and are not a limitation of the utility model, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way, and the person skilled in the art can make modifications, replacements and variations of the embodiments without creative contribution after reading the specification without departing from the principles and purposes of the utility model, but as long as it is within the scope of the claims of the utility model, it is protected by the patent law.

Claims

1. A high-voltage automotive drive motor grounding carbon brush and position sensor combination assembly, comprising a main housing (1), characterized in that, the left end of the main housing (1) is an external connector (2), which is provided with a connector insert (3) inside, and the edge of the main housing (1) is provided with a plurality of bolt mounting holes (4), the bolt mounting holes (4) at the left and right ends are connected with a brush holder (5), and the brush holder (5) is provided with a carbon brush assembly inside, the main housing (1) is provided with a circular groove, and the circular groove is fitted with a movable carbon brush guard (7), the main housing (1) is provided with a PCB board (8), and the PCB board (8) is provided with a main control circuit (9), an internal connector (10), an eddy current coil (11), and a grounding device (12).

2. A ground carbon brush and position sensor combination assembly for a high voltage automotive drive motor according to claim 1, characterized in that: The main housing (1) is connected with the motor, and a sealing rubber strip (13) is arranged between the main housing (1) and the motor bottom shell.

3. A ground carbon brush and position sensor combination assembly for a high voltage automotive drive motor according to claim 2, wherein: The sealing rubber strip (13) is bonded with the main housing (1) by using a dispensing or liquid silicone process, and surrounds the upper edge of the main housing (1).

4. A ground carbon brush and position sensor combination assembly for a high voltage automotive drive motor according to claim 1, wherein: The carbon brush guard (7) is composed of a carbon rod (14), a sleeve (15), a braided wire (16), and a spring (17), the carbon rod (14) and the braided wire (16) are integrally formed, the sleeve (15) is sleeved on the braided wire (16), and the spring (17) is sleeved on the sleeve (15).

5. A ground carbon brush and position sensor combination assembly for a high voltage automotive drive motor according to claim 1, wherein: The motor rotating shaft can be deeply inserted into the circular groove of the main housing (1) to contact the carbon rod (14); the motor stator temperature sensor circuit can be led out to the outside of the motor through the internal connector (10), the main control circuit (9), and the external connector (2).

6. A ground carbon brush and position sensor combination assembly for a high voltage automotive drive motor according to claim 1, wherein: The main housing (1) is installed in the cavity sealing part of the motor bottom shell, and the outer end of the main housing (1) is provided with a packaging cover (100) covering the internal elements of the main housing (1).

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