Integrated motor structure with bidirectional power recovery

Abstract

The invention discloses an integrated motor structure with a bidirectional power recovery function, which belongs to the field of permanent magnet synchronous motors and comprises a casing suite, and a motor casing integrated electric control junction box assembly is mounted on the casing suite. A motor through type output shaft is arranged at the position of a central shaft of the machine shell suite, and a plurality of sets of stator assemblies and rotor assemblies are arranged in the machine shell suite. The stator assembly is fixedly connected with the inner wall of the machine shell suite, a radial gap is formed between the stator assembly and the circumference of the motor through type output shaft, the rotor assemblies are fixedly arranged on the motor through type output shaft, and the wet brakes are arranged between the different rotor assemblies. The motor is compact in structure, small in size, light in weight, capable of providing larger torque output, capable of reducing loss energy, capable of improving efficiency and capable of achieving accurate speed and torque control. The device is fast in dynamic response, does not generate electromagnetic noise and vibration in the operation process, is relatively simple in structure, and is relatively long in service life and relatively high in reliability.

Description

Technical Field

[0001] The invention relates to the field of permanent magnet synchronous motors, and in particular to an integrated motor structure with bidirectional power recovery. Background Art

[0002] Permanent magnet synchronous motor is the largest type of motor currently installed in electric vehicles. It is mainly due to the cheapness of electronically controlled speed regulation brought by its simple structure and its significantly superior power density, as well as the efficiency advantage of meters in domestic cities with medium and low speed working conditions. In addition, my country has a reserve advantage in rare earth resources. Therefore, most of the drive motors selected for domestic new energy vehicles are permanent magnet synchronous motors. The magnetic field of the water-magnetic synchronous motor is excited by permanent magnets that generate sinusoidal back electromotive force. Like any rotating motor, it is composed of components such as rotors and stators, and its structure is similar to that of synchronous motors. The only difference is the rotor, which is equipped with permanent magnets to generate a magnetic field, so there is no need to wind any excitation winding on the rotor. The most basic structure of a permanent magnet synchronous motor is a stator and a rotor. The stator is similar to the stator of an asynchronous motor and is wound with insulated copper wire. The rotor contains a water magnet and has a certain number of poles to establish the main magnetic field of the motor. The stator of the permanent magnet synchronous motor is energized, and the stator winding is composed of a group of electromagnets, and the N poles and S poles of the electromagnets are evenly distributed along the inside of the stator. The permanent magnet rotor itself has stable N and S poles. "Synchronous" means that the speed of the rotor is always consistent with the speed of the magnetic field generated by the stator winding. There is an electromagnetic force interacting between the stator and the rotor. When the stator magnetic field rotates at a certain speed, the electromagnetic force pulls the rotor to follow the movement of the magnetic field and keep it synchronized with the magnetic field.

[0003] The current disadvantages of permanent magnet synchronous motors are that they are large in size and low in power density, and it is impossible to achieve the motor power required by customers within the limited size. Summary of the invention

[0004] With regard to the above-mentioned problems existing in the prior art, an object of the present invention is to provide an integrated motor structure with bidirectional power recovery to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An integrated motor structure with bidirectional power recovery comprises a housing kit, on which a motor housing integrated electric control junction box assembly is mounted;

[0007] The casing kit is a cylindrical hollow cavity, and end covers are provided on the side walls at both ends of the casing kit, and the end covers are fixedly connected to the casing kit by fastening bolts;

[0008] A motor through-type output shaft is arranged at the position of the central axis of the housing kit, and the motor through-type output shaft is movably connected to the center position of the end cover through a motor shaft bearing;

[0009] A plurality of stator assemblies and rotor assemblies are arranged inside the housing kit; the stator assembly is fixedly connected to the inner wall of the housing kit, a radial gap is arranged between the stator assembly and the circumference of the through-type output shaft of the motor, a rotor assembly is fixedly arranged on the through-type output shaft of the motor, and the rotor assembly is arranged in the radial gap between the stator assembly and the through-type output shaft of the motor, and the rotor in the rotor assembly and the stator in the stator assembly are arranged in a one-to-one matching manner;

[0010] Wet brakes are provided between the different rotor assemblies.

[0011] As a further solution of the present invention: the number of groups of the rotor assembly is equal to and greater than or equal to the number of groups of the stator assembly.

[0012] As a further solution of the present invention: the wet brake comprises a wet brake oil seal seat, a wet brake stator, a wet brake rotor, a wet brake push plate, a first wet brake oil seal and a second wet brake oil seal, one side of the wet brake oil seal seat is connected to the inner wall of the housing kit through the first wet brake oil seal, and the other side of the wet brake oil seal seat is connected to the outer wall of the motor through-type output shaft through the second wet brake oil seal, there are two groups of wet brake oil seal seats, the two groups of wet brake oil seal seats are arranged close to different rotor assemblies, one side of the relative positions of the two groups of wet brake oil seal seats is respectively provided with a group of wet brake push plates, a wet brake stator and a wet brake rotor are provided between the two groups of wet brake push plates, multiple groups of wet brake stators and wet brake rotors are each provided, and the wet brake stators and wet brake rotors are arranged at intervals from each other.

[0013] As a further solution of the present invention: each iron core of the stator assembly is provided with a wire embedding groove, and the wire embedding groove is an inclined groove structure with a radial angle between the wire embedding groove and the corresponding stator.

[0014] As a further solution of the present invention: each iron core of the stator assembly is made of silicon steel sheet material.

[0015] As a further solution of the present invention: each iron core of the rotor assembly is an end face annular magnetic steel groove, in which a fan-shaped magnetic steel is bonded, and the fan-shaped magnetic steels are separated by aluminum alloy spacers, and the fan-shaped magnetic steels and their corresponding iron cores are fastened by bolts.

[0016] As a further solution of the present invention: each iron core of the rotor assembly is made of electrical soft iron material.

[0017] As a further solution of the present invention: a coolant injection joint and a coolant output joint are provided on the side wall of the housing kit, and the coolant injection joint and the coolant output joint are respectively arranged on the two end side walls of the housing kit.

[0018] As a further solution of the present invention: a rotary transformer is provided on the through-type output shaft of the motor.

[0019] As a further solution of the present invention: the motor housing integrated electric control junction box body assembly is provided with a cable socket of the rotary transformer, and the motor housing integrated electric control junction box body assembly is also provided with a supercapacitor-based battery.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention has a compact structure, small size, and light weight, and can provide a greater torque output, so that the gas source magnetic field of the permanent magnet synchronous motor is inductively enhanced. The excitation magnetic field of the permanent magnet synchronous motor is provided by the permanent magnet, and the rotor does not need an excitation current, so the loss can be reduced and the efficiency is improved. Especially when the speed is low, the energy saving effect is obvious, and accurate speed and torque control can be achieved. The present invention has a fast dynamic response, and the permanent magnet synchronous motor of the same power has a small rotor moment of inertia, synchronous operation, and no slip rate, so it responds quickly, has good starting acceleration, and does not generate electromagnetic noise and vibration during operation. It is suitable for application scenarios that require low noise and low vibration. The structure of the permanent magnet synchronous motor is relatively simple, so its life and reliability are high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention is a schematic structural diagram of an integrated motor structure with bidirectional power recovery disclosed in an embodiment.

[0023] Figure 2 An internal cross-sectional view of an integrated motor structure with bidirectional power recovery disclosed in an embodiment.

[0024] The reference numerals in the figure are: 1. end cover; 2. fastening bolts; 3. motor housing integrated electronic control junction box body assembly; 4. motor shaft bearing; 5. stator assembly; 6. rotor assembly; 7. wet brake; 701. wet brake oil seal seat; 702. wet brake stator; 703. wet brake moving plate; 704. wet brake push plate; 705. first wet brake oil seal; 706. second wet brake oil seal; 8. motor through-type output shaft; 9. housing kit; 10. coolant injection connector; 11. coolant output connector. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", and "connected" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] See also Figure 1-2 An integrated motor structure with bidirectional power recovery includes a casing kit 9, on which a motor casing integrated electric control junction box body assembly 3 is installed. The motor casing integrated electric control junction box body assembly 3 is used to control the operation of the motor, facilitate the use of the device, and ensure safety.

[0028] The casing kit 9 ​​is set as a cylindrical hollow cavity, and the side walls at both ends of the casing kit 9 ​​are provided with end covers 1. The end covers 1 are fixedly connected to the casing kit 9 ​​by fastening bolts 2. The end covers 1 ensure the sealing of the device, which is beneficial to protecting the internal structure of the device and increasing safety.

[0029] The motor through-type output shaft 8 is arranged at the central axis of the housing kit 9, and the motor through-type output shaft 8 is movably connected to the central position of the end cover 1 through the motor shaft bearing 4, ensuring the use of the device and facilitating subsequent work. Both ends of the motor shaft 8 extend out of the housing kit 9, and are used for the double output shaft extension structure of the transmission;

[0030] A plurality of groups of stator assemblies 5 and rotor assemblies 6 are arranged inside the casing kit 9; the stator assembly 5 and the inner wall of the casing kit 9 ​​are fixedly connected, a radial gap is arranged between the stator assembly 5 and the circumference of the motor through-type output shaft 8, a rotor assembly 6 is fixedly arranged on the motor through-type output shaft 8, and the rotor assembly 6 is arranged in the radial gap between the stator assembly 5 and the motor through-type output shaft 8, the rotor in the rotor assembly 6 and the stator in the stator assembly 5 are arranged in a one-to-one matching manner to generate an electromagnetic torque for driving the motor shaft 8.

[0031] The number of groups in the rotor assembly 6 is equal to that in the stator assembly 5 and is greater than or equal to 2.

[0032] This embodiment adopts a horizontal double output shaft extension structure, which is flat and close to the outer diameter of the reducer input shaft. The two shaft extension ends of the motor can be installed with a planetary gear reducer and a brake respectively. The planetary gear reducer is used as an intermediate transmission device to connect the hub of the drive axle and the external reducer assembly. The motor working torque is reduced by nearly dozens of times after the planetary gear reducer ratio is changed, and the size of the motor is reduced at the same time. In addition, a spiral water circulation channel is used in the casing cavity, which has small water resistance and large heat dissipation power, which can greatly increase the thermal load of the motor and further reduce the size of the motor; the wet brake is directly installed in the central part of the motor, with a compact and reasonable structure, and safe and reliable braking. Two sets of disc stators and rotors are symmetrically distributed inside the motor, which belongs to the dual-motor synchronous drive mode, sharing a set of structural components and rotary transformers, and can flexibly convert single motor operation or dual motor operation according to the application occasion, thereby improving the utilization rate of materials and saving electricity and material costs. This invention adopts the principle of permanent magnet motor, which has high efficiency, high power factor, large torque, smooth start-up, low noise and good speed regulation performance. It can be accurately positioned in crane applications, while avoiding the impact of frequent jogging and extending the service life of the system.

[0033] Wet brakes 7 are provided between different rotor assemblies 6, and the wet brakes 7 include a wet brake oil seal seat 701, a wet brake stator 702, a wet brake rotor 703, a wet brake push plate 704, a first wet brake oil seal 705, and a second wet brake oil seal 706. One side of the wet brake oil seal seat 701 is connected to the inner wall of the housing kit 9 ​​through the first wet brake oil seal 705, and the other side of the wet brake oil seal seat 701 is connected to the outer wall of the motor through-type output shaft 8 through the second wet brake oil seal 706.

[0034] There are two groups of wet brake oil seal seats 701, and the two groups of wet brake oil seal seats 701 are arranged near different rotor assemblies 6. A group of wet brake push plates 704 is respectively arranged on one side of the relative positions of the two groups of wet brake oil seal seats 701, and a wet brake stator 702 and a wet brake movable plate 703 are arranged between the two groups of wet brake push plates 704. There are multiple groups of wet brake stator plates 702 and wet brake movable plates 703 respectively, and the wet brake stator plates 702 and wet brake movable plates 703 are arranged at intervals from each other.

[0035] According to the number of stators and rotors and the relative position of stators and rotors, they can be divided into four categories: single stator and rotor structure, double stator intermediate rotor structure, double rotor intermediate stator structure and multi-disc structure. The present invention can start the number of stators and rotors according to the load. The bilateral structure of the intermediate stator or rotor can overcome the problem of unilateral magnetic pull.

[0036] Each core of the stator assembly 5 is provided with a wire embedding groove, which is a skewed groove structure with a radial angle between the corresponding stator, so as to reduce the noise of the motor and overcome the cogging torque of the permanent magnet motor. Preferably, the radial angle of the skewed groove structure is a tooth pitch, which can better eliminate noise.

[0037] In another preferred embodiment, each iron core of the stator assembly 5 is made of silicon steel sheet material.

[0038] In addition, each iron core of the rotor assembly 6 is an end face annular magnetic steel groove, in which a sector-shaped magnetic steel is bonded. The sector-shaped magnetic steels are separated by aluminum alloy spacers, and the sector-shaped magnetic steels are fastened to the corresponding iron core by bolts.

[0039] Preferably, each iron core of the rotor assembly 5 is made of electrical soft iron material.

[0040] The side wall of the housing kit 9 ​​is provided with a coolant injection joint 10 and a coolant output joint 11, and the coolant injection joint 10 and the coolant output joint 11 are respectively arranged on the side walls of the housing kit 9 ​​at both ends, which is convenient for the use of the motor and ensures safety. The motor housing body 3 is provided with a spiral water circulation channel for heat dissipation, and two water joints are provided on the housing body 1. The water inlet and water outlet of the spiral water circulation channel are respectively connected to one of the water joints, and the cooling water flows into the spiral water circulation channel from the water inlet joint. The cooling water takes away the heat of the motor housing body 3, the stator assembly 5 and the housing kit 9 ​​in the spiral water circulation channel, and flows out of the motor from the water outlet joint. The spiral water circulation channel for heat dissipation is used in the housing cavity, which has small water resistance and large heat dissipation power, can greatly increase the heat load of the motor, and further reduce the size of the motor.

[0041] Preferably, a rotary transformer is provided on the through-type output shaft 8 of the motor. The rotary transformer is an electromagnetic sensor, also known as a synchronous resolver. It is a small AC motor used for measuring angle, used to measure the angular displacement and angular velocity of the rotating shaft of a rotating object. The rotary transformer is a precision angle, position, and speed detection device, suitable for all occasions where rotary transformers are used, and is suitable for high temperature, severe cold, humidity, high speed, high vibration and other occasions where rotary encoders cannot work normally. Due to the above characteristics of the rotary transformer, it can completely replace the photoelectric encoder or the magnetic encoder. Here it is used to detect the angular displacement and angular velocity of the rotating shaft of the through-type output shaft 8 of the motor.

[0042] The motor housing integrated electric control junction box body assembly 3 is provided with a cable socket of the rotary transformer, and the motor housing integrated electric control junction box body assembly is also provided with a battery based on a supercapacitor. The permanent magnet motor rotor is equipped with a permanent magnet. During the process of vehicle speed reduction, the permanent magnet used for driving can be in a power generation state, converting the kinetic potential energy into electrical energy, and storing it in a battery based on a supercapacitor. The advantages of supercapacitors are high power density, short charging and discharging time, long cycle life, and wide operating temperature range, which are very suitable for the working condition of industrial vehicle speed reduction. When the power grid suddenly loses power, the direct current stored in the supercapacitor can be supplied to the permanent magnet motor through an inverter, which can ensure that the vehicle can continue to work in a short time after the power outage, so that the vehicle can be decelerated smoothly, and the fully reliable operation of the vehicle is guaranteed. Among them, the battery based on the supercapacitor belongs to the prior art and will not be repeated here.

[0043] The present invention has a compact structure, small size and light weight. Since high-performance permanent magnet materials are used to provide the magnetic field, the gas-generating magnetic field of the permanent magnet synchronous motor is enhanced compared to the induction motor, and the volume and mass of the permanent magnet synchronous motor are smaller than those of the induction motor. Compared with asynchronous motors of the same specifications, the weight and volume can be reduced by about 30%. High efficiency: high efficiency, energy saving, and low loss. The excitation magnetic field of the permanent magnet synchronous motor is provided by permanent magnets, and the rotor does not require excitation current. Compared with the asynchronous motors of the same specifications, the loss can be reduced by 40%, and the efficiency is increased by 3%, especially when the speed is low. The energy-saving effect is obvious. The present invention has a fast dynamic response, and the permanent magnet synchronous motor of the same power has a small rotor moment of inertia, synchronous operation, and no slip rate, so it responds quickly and has good starting acceleration.

[0044] The present invention has a low failure rate and is widely used; since high-performance rare earth permanent magnet materials are used to provide the magnetic field, the failure rate is even lower and the use is more universal.

[0045] The invention has high efficiency: the disc-type permanent magnet synchronous motor does not need additional excitation current to generate a magnetic field, thereby reducing energy loss. Its efficiency can reach more than 95%, which is more than 10% higher than the efficiency of traditional asynchronous motors.

[0046] The invention has high power density and small volume: Since the permanent magnet synchronous motor does not require additional excitation current, its volume and weight can be relatively small, thereby achieving high power density. This means that under the same volume and weight, the permanent magnet synchronous motor can provide higher power output.

[0047] High torque density of the present invention: The disc-type permanent magnet synchronous motor has a high torque density, which means that it can provide a greater torque output under the same volume and weight, which is very important for application scenarios that require high torque output.

[0048] Good control performance of the present invention: The permanent magnet synchronous motor has good control performance and can achieve precise speed and torque control. This makes the permanent magnet synchronous motor advantageous in application scenarios that require precise control.

[0049] The present invention has low noise and low vibration: since the magnetic field of the permanent magnet synchronous motor is generated by permanent magnets, no electromagnetic noise and vibration will be generated during its operation, and it is suitable for application scenarios requiring low noise and low vibration.

[0050] The invention has long life and high reliability: the permanent magnet of the permanent magnet synchronous motor does not require additional excitation current, so there will be no overheating problem during its operation. In addition, the structure of the permanent magnet synchronous motor is relatively simple, so its life and reliability are high.

[0051] The present invention has good dynamic performance: the disc-type permanent magnet synchronous motor has high dynamic performance and is suitable for use in situations requiring rapid response and high-precision control.

[0052] A multi-plate brake system is set in the center of the motor to realize mechanical central parking with a compact structure; the motor housing is equipped with central internal circulation cooling to ensure the heat dissipation of the motor and central brake, and avoid high temperature of the motor caused by long-term use; the two motors integrated in the motor can be controlled separately, which can realize single-motor drive as well as dual-motor boost drive. At the same time, the dual-motor power recovery in different environments is set in linkage with the whole vehicle, and the power recovery efficiency is higher.

[0053] The present invention can improve output, quality, yield, quality, precision and efficiency, save energy consumption, raw materials and working procedures, simplify processing, operation, control and use, increase service life and reliability, and is beneficial to environmental protection and reduces labor intensity.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention, and any reference numerals in the claims should not be considered as limiting the claims involved.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An integrated motor structure with bidirectional power recovery, characterized in that: It comprises a housing kit (9), on which a motor housing integrated electric control junction box body assembly (3) is mounted; The casing kit (9) is provided with a cylindrical hollow cavity, and end covers (1) are provided on the side walls at both ends of the casing kit (9), and the end covers (1) are fixedly connected to the casing kit (9) by fastening bolts (2); A motor through-type output shaft (8) is provided at the position of the central axis of the housing kit (9), and the motor through-type output shaft (8) is movably connected to the central position of the end cover (1) through a motor shaft bearing (4); A plurality of groups of stator assemblies (5) and rotor assemblies (6) are arranged inside the housing assembly (9); the stator assembly (5) and the inner wall of the housing assembly (9) are fixedly connected; a radial gap is arranged between the circumference of the stator assembly (5) and the motor through-type output shaft (8); a rotor assembly (6) is fixedly arranged on the motor through-type output shaft (8); the rotor assembly (6) is arranged in the radial gap between the stator assembly (5) and the motor through-type output shaft (8); the rotor in the rotor assembly (6) and the stator in the stator assembly (5) are arranged in a one-to-one matching manner; Wet brakes (7) are arranged between different rotor assemblies (6).

2. The integrated motor structure with bidirectional power recovery according to claim 1, characterized in that: The number of groups of the rotor assembly (6) and the stator assembly (5) is equal and greater than or equal to 2.

3. The integrated motor structure with bidirectional power recovery according to claim 2, characterized in that: The wet brake (7) comprises a wet brake oil seal seat (701), a wet brake stator (702), a wet brake rotor (703), a wet brake push plate (704), a first wet brake oil seal (705) and a second wet brake oil seal (706). One side of the wet brake oil seal seat (701) is connected to the inner wall of the housing kit (9) through the first wet brake oil seal (705), and the other side of the wet brake oil seal seat (701) is connected to the outer wall of the motor through-type output shaft (8) through the second wet brake oil seal (706). Two groups of wet brake oil seal seats (701) are provided. The two groups of wet brake oil seal seats (701) are arranged close to different rotor assemblies (6). A group of wet brake push plates (704) are respectively arranged on one side of the two groups of wet brake oil seal seats (701) at opposite positions. A wet brake stator plate (702) and a wet brake rotor plate (703) are arranged between the two groups of wet brake push plates (704). Multiple groups of wet brake stator plates (702) and wet brake rotor plates (703) are respectively provided. The wet brake stator plates (702) and wet brake rotor plates (703) are arranged at intervals from each other.

4. The integrated motor structure with bidirectional power recovery according to claim 3, characterized in that: Each iron core of the stator assembly (5) is provided with a wire embedding groove, and the wire embedding groove is an inclined groove structure with a radial angle between the groove and the corresponding stator.

5. The integrated motor structure with bidirectional power recovery according to claim 4, characterized in that: Each iron core of the stator assembly (5) is made of silicon steel sheet material.

6. The integrated motor structure with bidirectional power recovery according to claim 5, characterized in that: Each iron core of the rotor assembly (6) is an end face annular magnetic steel groove, in which a sector-shaped magnetic steel is bonded, and the sector-shaped magnetic steels are separated by aluminum alloy spacers, and the sector-shaped magnetic steels and their corresponding iron cores are fastened by bolts.

7. The integrated motor structure with bidirectional power recovery according to claim 6, characterized in that: Each iron core of the rotor assembly (5) is made of electrical soft iron material.

8. The integrated motor structure with bidirectional power recovery according to claim 7, characterized in that: A coolant injection joint (10) and a coolant output joint (11) are provided on the side wall of the casing kit (9), and the coolant injection joint (10) and the coolant output joint (11) are respectively arranged on the side walls at both ends of the casing kit (9).

9. The integrated motor structure with bidirectional power recovery according to claim 8, characterized in that: The motor through-type output shaft (8) is provided with a rotary transformer.

10. The integrated motor structure with bidirectional power recovery according to claim 9, characterized in that: The motor housing integrated electric control junction box body assembly (3) is provided with a cable socket of the rotary transformer, and the motor housing integrated electric control junction box body assembly (3) is also provided with a supercapacitor-based battery.

Images