A speed regulating motor

Abstract

The present invention relates to the field of motor technology, and specifically to a speed-regulating motor. It comprises a housing and a motor shaft, and further comprises: a mounting housing, located inside the housing and rotatably arranged relative to both the housing and the motor shaft; an electric portion, comprising an inner rotor and an armature winding, wherein the inner rotor is fixedly sleeved on the motor shaft, the armature winding is fixed on the inner side of the mounting housing, and the armature winding is powered by a collector ring carbon brush assembly; a power generation portion, comprising a permanent magnet rotor and a stator winding, wherein the permanent magnet rotor is fixed on the outer side of the mounting housing, and the stator winding is fixed on the inner side of the housing; and a control portion, electrically connected to the stator winding, wherein the control portion is adapted to adjust the output speed of the motor by controlling the current in the stator winding. The speed of the armature winding of the present invention is the slip of the system speed regulation, and the speed is very low, which greatly prolongs the service life of the collector ring carbon brush assembly, and also prolongs the service life of the armature winding support bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a speed-regulating motor. Background Art

[0002] Electric motors are major energy consumers in people's daily lives and industrial production. According to statistics, electric motor power consumption accounts for more than 60% of the total power generation. Therefore, improving the energy efficiency of electric motors is of great significance to the achievement of energy-saving goals and the high-quality development of the social economy. Among them, motor speed regulation is recognized as a very effective energy-saving method. There are three main speed regulation methods: electromagnetic speed regulation, cascade speed regulation, and variable frequency speed regulation. Each of the three methods has its disadvantages: electromagnetic speed regulation has low speed regulation efficiency, large slip power loss, and a large axial length; cascade speed regulation does not have a low voltage ride-through function; variable frequency speed regulation technology is complex, expensive, has high environmental requirements, and is difficult to maintain and repair. Therefore, there is an urgent need for a speed regulation motor with high efficiency, small axial length, and low voltage ride-through function.

[0003] The patent with announcement number "CN207053364U" discloses a permanent magnet coupled speed regulation motor. This structure has high speed regulation efficiency, small size, and low voltage ride-through capability. However, due to the high speed of the structure to which the collector ring carbon brush assembly is attached, the service life of the collector ring carbon brush assembly will be greatly shortened, and the life of the corresponding bearing structure will also be greatly reduced, increasing maintenance costs. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the speed regulating motor in the prior art has the advantages of high efficiency, small axial length and low voltage ride-through function, but its carbon brushes and corresponding bearing structures have short lifespan, resulting in high maintenance costs, thereby providing a speed regulating motor.

[0005] The speed-regulating motor provided by the present invention comprises a housing and a motor shaft, and further comprises:

[0006] An installation housing is located inside the housing and is rotatably arranged relative to the housing and the motor shaft, and the installation housing is coaxial with the motor shaft;

[0007] The electric part includes an inner rotor and an armature winding, wherein the inner rotor is fixedly sleeved on the motor shaft, the armature winding is fixed on the inner side of the mounting housing and arranged opposite to the inner rotor, and the armature winding is powered by a slip ring carbon brush assembly;

[0008] A power generation part, comprising a permanent magnet rotor and a stator winding, wherein the permanent magnet rotor and the stator winding are arranged opposite to each other, and the permanent magnet rotor is fixed to the outside of the mounting shell, and the stator winding is fixed to the inside of the casing;

[0009] The control part is electrically connected to the stator winding, and the control part is suitable for adjusting the output speed of the motor by controlling the current in the stator winding.

[0010] Optionally, the mounting housing includes:

[0011] A cylinder, the armature winding is fixed to the inner wall of the cylinder, and the permanent magnet rotor is fixed to the outer wall of the cylinder;

[0012] The flange shaft includes a shaft and a first flange plate. The shaft is coaxial with the cylinder, and one end of the shaft is fixed to one end of the cylinder through the first flange plate. The other end of the shaft extends away from the cylinder. The collector ring carbon brush assembly is installed on the shaft, and the end of the shaft away from the cylinder is rotatably installed on the casing.

[0013] Optionally, the mounting housing further includes:

[0014] a hollow flange shaft comprising a hollow shaft and a second flange plate, wherein the hollow shaft is coaxial with the cylinder, one end of the hollow shaft is fixed to the other end of the cylinder via the second flange plate, the other end of the hollow shaft extends away from the cylinder, and the hollow shaft is rotatably mounted on the housing;

[0015] The motor shaft is rotatably mounted on the hollow flange shaft and is coaxial with the cylinder. One end of the motor shaft passes through the hollow flange shaft to form an output end.

[0016] Optionally, the slip ring of the slip ring carbon brush assembly is fixedly sleeved on the shaft, and the carbon brush of the slip ring carbon brush assembly is fixed on the inner side of the housing.

[0017] Optionally, the inner rotor is a squirrel-cage rotor, a permanent magnet rotor, or a winding rotor.

[0018] Optionally, the control part includes a rectifier and an inverter, and is suitable for connecting to a power grid.

[0019] Optionally, the control part includes a variable resistor, which adjusts the motor speed by changing the resistance value.

[0020] Optionally, the speed regulating motor may also include:

[0021] The braking structure is fixed on the inner side of the housing and is suitable for preventing the mounting shell from rotating.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. The speed-regulating motor provided by the present invention is provided with an electric part, a power generation part and a control part. The control part realizes speed regulation by controlling the current of the stator winding in the power generation part, and has the advantages of high efficiency, small axial length and low voltage ride-through function in the existing structure; and, the present invention installs the electric part on the inner side of the power generation part, and the armature winding of the electric part is powered by the slip ring carbon brush assembly. The slip ring and the armature winding of the electric part rotate synchronously, and the speed of the armature winding is the slip of the system speed regulation, and the speed is very low, which greatly extends the service life of the slip ring carbon brush assembly, and also improves the operating conditions of the armature winding support bearing, thereby extending the service life of the armature winding support bearing.

[0024] 2. The speed-regulating motor provided by the present invention is provided with a braking structure, which can fix the mounting housing according to actual needs, thereby losing the speed regulation function, allowing the motor to operate at the highest efficiency under rated working conditions, and can meet the needs of special occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 2 is a cross-sectional view of the entire structure of the speed-regulating motor according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic structural diagram of the rotor part in an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the structure of the stator part in an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 1. Casing; 2. Motor shaft; 3. Mounting housing; 31. Cylinder; 32. Flange shaft; 321. Shaft; 322. First flange plate; 33. Hollow flange shaft; 331. Hollow shaft; 332. Second flange plate; 4. Electric part; 41. Inner rotor; 42. Armature winding; 43. Collector ring carbon brush assembly; 5. Power generation part; 51. Permanent magnet rotor; 52. Stator winding; 6. Control part; 7. Braking structure; 8. External power supply. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1

[0034] like Figure 1-3 A specific embodiment of the speed-regulating motor shown includes a housing 1 and a motor shaft 2, and further includes:

[0035] The mounting housing 3 is located inside the housing 1 and is rotatably arranged relative to the housing 1 and the motor shaft 2. The mounting housing 3 is coaxial with the motor shaft 2.

[0036] The motor part 4 includes an inner rotor 41 and an armature winding 42. The inner rotor 41 is fixedly sleeved on the motor shaft 2. The armature winding 42 is fixed on the inner side of the mounting housing 3 and arranged opposite to the inner rotor 41. The armature winding 42 is powered by a slip ring carbon brush assembly 43.

[0037] The power generation part 5 includes a permanent magnet rotor 51 and a stator winding 52. The permanent magnet rotor 51 and the stator winding 52 are arranged opposite to each other, and the permanent magnet rotor 51 is fixed to the outside of the mounting housing 3, and the stator winding 52 is fixed to the inside of the casing 1;

[0038] The control part 6 is electrically connected to the stator winding 52 . The control part 6 is suitable for adjusting the output speed of the motor by controlling the current in the stator winding 52 .

[0039] The above-mentioned speed regulating motor has the advantages of high efficiency, small axial length and low voltage ride-through function in the existing structure. The description of this part of the advantages can be specifically referred to the patent with the announcement number "CN207053364U"; and, the present invention installs the electric part 4 on the inner side of the power generation part 5, and the armature winding 42 of the electric part 4 is powered by the slip ring carbon brush assembly 43. The slip ring and the armature winding 42 of the electric part 4 rotate synchronously, and the speed of the armature winding 42 is the slip of the system speed regulation. The speed is very low, which greatly extends the service life of the slip ring carbon brush assembly 43. At the same time, it also improves the operating conditions of the armature winding 42 support bearings and extends the service life of the armature winding 42 support bearings. For example: a 4-stage motor with a synchronous speed of 1500rpm, if the load requires a speed regulation of 10%, the slip n s=1500×10%=150rpm. It can be seen that compared with the structure described in the patent publication number “CN207053364U”, the rotation speed of the armature winding 42 in the present invention is very low.

[0040] The housing 1 and the motor shaft 2 are well-known structures in the art. The motor shaft 2 is rotatably arranged relative to the housing 1. Specifically, it can be directly rotatably mounted on the housing 1 through a bearing, or indirectly rotatably mounted on the housing 1 through other structures, such as Figure 1 shown.

[0041] It is easy to understand that the mounting shell 3 is rotatable relative to both the housing 1 and the motor shaft 2 , that is, the mounting shell 3 can freely rotate relative to the housing 1 and can also freely rotate relative to the motor shaft 2 .

[0042] The structure of the mounting housing 3 is not limited. Here, a preferred structure is provided. The mounting housing 3 includes:

[0043] The cylinder 31, the armature winding 42 is fixed to the inner wall of the cylinder 31, and the permanent magnet rotor 51 is fixed to the outer wall of the cylinder 31;

[0044] The flange shaft 32 includes a shaft 321 and a first flange plate 322. The shaft 321 is coaxial with the cylinder 31, and one end of the shaft 321 is fixed to one end of the cylinder 31 through the first flange plate 322. The other end of the shaft 321 extends away from the cylinder 31. The collector ring carbon brush assembly 43 is installed on the shaft 321. The end of the shaft 321 away from the cylinder 31 is rotatably installed on the housing 1.

[0045] This structure not only ensures the installation of the electric part 4 and the power generation part 5, but also facilitates the installation of the collector ring carbon brush assembly 43.

[0046] Furthermore, the mounting housing 3 further comprises:

[0047] The hollow flange shaft 33 includes a hollow shaft 331 and a second flange plate 332. The hollow shaft 331 is coaxial with the cylinder 31, and one end of the hollow shaft 331 is fixed to the other end of the cylinder 31 via the second flange plate 332. The other end of the hollow shaft 331 extends away from the cylinder 31. The hollow shaft 331 is rotatably mounted on the housing 1.

[0048] The motor shaft 2 is rotatably mounted on the hollow flange shaft 33 and is coaxial with the cylinder 31 . One end of the motor shaft 2 passes through the hollow flange shaft 33 to form an output end.

[0049] This mounting housing 3 has a relatively compact structure, and the motor shaft 2 is rotatably mounted on the hollow flange shaft 33 . Compared with directly rotatably mounting the motor shaft 2 on the housing 1 , the structure of the housing 1 is simplified, and installation is more convenient.

[0050] Specifically, the hollow shaft 331 or the shaft 321 and the corresponding flange plate can be fixed by integral molding or fixed by welding or bolts; the cylinder 31 and the flange plate can be fixed by welding or bolts.

[0051] Specifically, the slip rings of the slip ring carbon brush assembly 43 are fixedly sleeved on the shaft 321 , and the carbon brushes of the slip ring carbon brush assembly 43 are fixed on the inner side of the housing 1 .

[0052] As a replaceable structure for mounting the housing 3 , the hollow shaft 331 may be replaced by a cylindrical structure, the cylindrical structure may be directly rotationally mounted on the inner wall of the casing 1 , and then the motor shaft 2 may be rotationally mounted on the casing 1 .

[0053] The motor part 4 is similar to a conventional motor, but the present invention is unique in that the armature winding 42 is also a rotating component, and the armature winding 42 is powered by a slip ring carbon brush assembly 43. Specifically, the inner rotor 41 can be a squirrel cage rotor, a permanent magnet rotor, or a winding rotor.

[0054] Among them, the power generation part 5 is similar to a conventional permanent magnet generator, and its main function is to convert slip energy (energy absorbed by the electric part 4 from the power grid - energy consumed by the load end - a small amount of loss during energy conversion / transmission) into electrical energy.

[0055] The control unit 6 adjusts the motor output speed by adjusting the current in the stator winding 52 according to the actual load requirements. Specifically, the control unit 6 comprises a variable resistor, which adjusts the motor speed by changing its resistance. The control unit 6 can be fixed to the housing 1 or externally connected via leads, requiring only electrical connection to the stator winding 52.

[0056] Furthermore, the control unit 6 includes a rectifier and an inverter and is suitable for connection to the power grid. The slip energy generated by the speed regulation is converted into electrical energy by the power generation unit 5 and fed back to the power grid via the rectifier and inverter. Of course, the control unit 6 does not need to be connected to the power grid.

[0057] As an improved implementation of the speed-regulating motor, the speed-regulating motor further includes:

[0058] The braking structure 7 is fixed on the inner side of the housing 1 and is suitable for preventing the mounting shell 3 from rotating.

[0059] The braking structure 7 can fix the mounting housing 3 according to actual needs, thereby losing the speed regulation function, allowing the motor to operate at the rated working condition with the highest efficiency, which can meet the needs of special occasions.

[0060] Specifically, the braking mechanism may adopt a common structure such as a holding brake.

[0061] Based on the above specific embodiments, the working principle of the integrated speed regulating motor of the present invention is as follows:

[0062] Electric process: The external power supply provides AC power to the armature winding 42 of the electric part 4 through the collector ring carbon brush assembly 43. The armature winding 42 generates a rotating magnetic field. The conductor in the inner rotor 41 cuts the rotating magnetic field of the armature winding 42 to generate an induced current, thereby generating an induced magnetic field in the inner rotor 41. The induced magnetic field of the inner rotor 41 interacts with the rotating magnetic field of the armature winding 42 to transmit torque, thereby rotating the inner rotor 41 and driving the motor shaft 2 to rotate. It should be noted that since the armature winding 42 is freely rotatable, while driving the inner rotor 41 to rotate, the armature winding 42 itself will also rotate, and the speed of the armature winding 42 is the slip of the system speed regulation, that is, the lower the output speed required by the load, the higher the speed of the armature winding 42 can be adjusted.

[0063] Power generation process: The armature winding 42 rotates through the mounting housing 3 to drive the permanent magnet rotor 51 of the invention to rotate, forming a rotating magnetic field. The stator winding 52 cuts the rotating magnetic field of the permanent magnet rotor 51 to form an induced current, which is rectified and inverted by the control part 6 and then fed back to the power grid.

[0064] Speed ​​regulation process: This part is implemented based on the hardware structure of the power generation part 5. The control part 6 can adjust the size of the induced magnetic field generated by the induced current by adjusting the size of the induced current in the stator winding 52, thereby adjusting the size of the torque of the induced magnetic field on the permanent magnet rotor 51. The permanent magnet rotor 51 and the armature winding 42 rotate as a whole, so the speed of the armature winding 42 will be adjusted, and finally the output speed of the motor is adjusted.

[0065] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A speed regulating motor, comprising a housing (1) and a motor shaft (2), characterized in that: Also includes: An installation housing (3) is located inside the housing (1) and is rotatably arranged relative to both the housing (1) and the motor shaft (2), and the installation housing (3) is coaxial with the motor shaft (2); The motor part (4) includes an inner rotor (41) and an armature winding (42), wherein the inner rotor (41) is fixedly sleeved on the motor shaft (2), the armature winding (42) is fixed on the inner side of the mounting housing (3) and arranged opposite to the inner rotor (41), and the armature winding (42) is electrically connected to a collector ring carbon brush assembly (43); A power generation part (5), comprising a permanent magnet rotor (51) and a stator winding (52), wherein the permanent magnet rotor (51) and the stator winding (52) are arranged opposite to each other, and the permanent magnet rotor (51) is fixed on the outside of the mounting housing (3), and the stator winding (52) is fixed on the inside of the casing (1); A control part (6) is electrically connected to the stator winding (52), and the control part (6) is adapted to adjust the output speed of the motor by controlling the current in the stator winding (52); the control part (6) includes a rectifier and an inverter, and is adapted to be connected to a power grid; the control part includes a variable resistor, and the motor speed is adjusted by changing the resistance value; The mounting housing (3) comprises: A cylinder (31), the armature winding (42) is fixed to the inner wall of the cylinder (31), and the permanent magnet rotor (51) is fixed to the outer wall of the cylinder (31); A flange shaft (32) includes a shaft (321) and a first flange plate (322), wherein the shaft (321) is coaxial with the cylinder (31), and one end of the shaft (321) is fixed to one end of the cylinder (31) through the first flange plate (322), and the other end of the shaft (321) extends in a direction away from the cylinder (31), the collector ring carbon brush assembly (43) is mounted on the shaft (321), and the end of the shaft (321) away from the cylinder (31) is rotatably mounted on the housing (1); The hollow flange shaft (33) comprises a hollow shaft (331) and a second flange plate (332). The hollow shaft (331) is coaxial with the cylinder (31), and one end of the hollow shaft (331) is fixed to the other end of the cylinder (31) through the second flange plate (332). The other end of the hollow shaft (331) extends in a direction away from the cylinder (31). The hollow shaft (331) is rotatably mounted on the housing (1).

2. The speed regulating motor according to claim 1, characterized in that: The collector ring of the collector ring carbon brush assembly (43) is fixedly sleeved on the shaft (321), and the carbon brush of the collector ring carbon brush assembly (43) is fixed on the inner side of the housing (1).

3. The speed regulating motor according to claim 1 or 2, characterized in that: The inner rotor (41) is a squirrel-cage rotor, a permanent magnet rotor, or a winding rotor.

4. The speed regulating motor according to claim 1 or 2, characterized in that: Also includes: A braking structure (7) is fixed on the inner side of the housing (1) and is suitable for preventing the mounting shell (3) from rotating.

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