Double-winding double-pole speed-regulating motor for fan

Abstract

The utility model relates to a double-winding bipolar speed regulation motor for fan, and relates to the technical field of motor, and is used for solving the technical problems of narrow rotating speed range of the existing three-phase asynchronous motor, only running at a fixed rotating speed under the rated load, low efficiency, high long-term operation cost, non-adjustable motor rotating speed and single mode, wherein two independent windings with different pole pairs are embedded in the stator slot, and each winding adopts Y type connection, specifically, the stator core with winding is pressed into the inside of the machine base, and the terminal box seat is assembled to the top of the machine base, the rear end of the main shaft is without fan and fan cover, and the rear end cover at the shaft end is assembled with the protective cover by using the cross head screw.

Description

Technical Field

[0001] This utility model relates to the field of electric motor technology, and in particular to a double-winding, double-pole speed-regulating motor for fans, especially a 4 / 6-pole double-winding, double-stage speed-regulating motor with a rated power of 3.6 / 1.8kW for fans. Background Technology

[0002] Currently, electric motors, as crucial power devices in modern industrial automation, are widely used in various mechanical equipment. For applications requiring high speeds, bipolar speed-regulating motors are needed to adapt to switching between different speeds under rated loads and meet diverse operational requirements. Bipolar speed-regulating motors are suitable for applications requiring frequent speed changes, such as mechanical transmissions in industrial production and acceleration / deceleration in electric vehicles. They have a wide range of applications, high efficiency, energy saving, good performance, low vibration, low noise, long lifespan, and high reliability.

[0003] The 3.6 / 1.8kW, 4 / 6-pole double-winding bipolar speed-regulating motor is a new type of pole-changing speed-regulating motor that solves the aforementioned technical problems. Its rated voltage is [voltage value missing] volts, rated frequency is [frequency value missing] Hz, and its power rating and installation dimensions are identical, conforming to International Electrotechnical Commission (IEC) standards. This facilitates interchangeability with other motors in the series and export, achieving a comparable level to similar pole-changing speed-regulating motors from abroad. Furthermore, its efficiency is significantly improved compared to comparable specifications, contributing to energy savings in applications requiring long-term continuous operation.

[0004] However, the inventors of this application have discovered that in the prior art, a single-winding dual-speed motor has a set of stator windings placed in the stator slots. Changing the connection method of this set of windings can change the number of pole pairs, but the motor has poor overload capacity and dynamic stability. When the speed is low, the slip power consumption is large, which limits the speed range. The speed can only be changed at a few speed levels, and the speed regulation smoothness is poor. In addition, the maximum torque is reduced under certain connection methods, and it is only suitable for constant power speed regulation. Furthermore, the motor is large in size and has high manufacturing cost.

[0005] The pole-changing speed control method changes the number of poles in the motor by altering the stator winding connection, thereby achieving speed regulation. While this method offers relatively rigid mechanical characteristics and good stability, its speed adjustment is limited to a few predetermined speed levels, failing to achieve smooth speed regulation. Furthermore, due to limitations in motor structure and manufacturing processes, it typically only allows for stepped speed regulation with 2-3 pole pairs, resulting in a rather limited speed range. In addition, changing the wiring configuration may affect the motor's maximum torque, restricting its application scenarios. Utility Model Content

[0006] The purpose of this utility model is to provide a dual-winding, dual-pole speed-regulating motor for wind turbines, which solves the technical problems of existing three-phase asynchronous motors, such as narrow speed range, generally only able to operate at a fixed speed under rated load, low efficiency, high long-term operating costs, non-adjustable motor speed, and single operating mode.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A dual-winding, double-pole speed-regulating motor for a fan has two independent windings with different numbers of pole pairs embedded in the stator slots, and each winding is Y-connected; specifically, the winding stator core is pressed into the frame, and the junction box is assembled to the top of the frame.

[0009] There is no fan or fan cover at the rear end of the spindle, and the rear end cover at the spindle end is fitted with a protective cover using crosshead screws.

[0010] In practical applications, the spindle extension end is equipped with a type A flat key; the bearing chamber of the rear end cover is equipped with a rotor, and the two ends of the rotor are press-fitted with a first deep groove ball bearing and a second deep groove ball bearing; the oil seal position of the rear end cover is equipped with a first skeleton oil seal and fixed with a wave spring, and the rear end cover equipped with the first skeleton oil seal is locked to the machine base with hexagonal head bolts with spring washers.

[0011] The winding stator core includes a stator core and stator coils; the stator coils are wired in a double-layer configuration, with the lower coil being a single-layer cross-type winding and the upper coil being a single-layer chain-type winding.

[0012] Specifically, the first deep groove ball bearing is installed in the bearing chamber of the flange end cover, the second skeleton oil seal is installed in the oil seal position of the flange end cover, and the flange end cover with the first deep groove ball bearing is locked and fixed to the machine base.

[0013] Furthermore, the junction box cover is mounted on the junction box base using Phillips head recessed screws, and the junction box base is equipped with a waterproof connector made of polyamide resin.

[0014] Furthermore, the rotor includes the main shaft and the cast aluminum rotor, and the cast aluminum rotor is sleeved on the main shaft, while the first deep groove ball bearing and the second deep groove ball bearing are press-fitted at both ends of the cast aluminum rotor;

[0015] The main body of the cast aluminum rotor is made of 50W800 silicon steel sheets stacked together and aluminum-manganese alloy is cast. The aluminum-manganese alloy and silicon steel sheets are integrally formed. The two ends of the aluminum cage include rotor end rings, fan blades and balance columns.

[0016] Compared with the prior art, the dual-winding bipolar speed-regulating motor for wind turbines described in this utility model has the following advantages:

[0017] The dual-winding, dual-pole speed-regulating motor for fans provided by this utility model features two independent windings with different pole pairs embedded in the stator slots, each winding being Y-connected. Specifically, the stator core with windings is press-fitted into the frame, and the junction box is mounted on the top of the frame. The rear end of the main shaft has no fan or fan cover, and the rear end cover at the shaft end is fitted with a protective cover using crosshead screws. Therefore, the dual-winding, dual-pole speed-regulating motor for fans provided by this utility model significantly reduces the size and cost of the speed-regulating motor through its speed regulation and cooling methods. It effectively shortens the motor length, making the structure more compact. While maintaining the same performance, the length of the motor body is greatly shortened, effectively improving the space utilization of the equipment. This makes the motor more adaptable to compact spatial layouts and facilitates motor installation and maintenance. In other words, the dual-winding, double-pole speed-regulating motor for fans provided by this utility model enables a three-phase asynchronous motor to select a more suitable operating state at different speeds, thereby achieving better working efficiency. This effectively improves motor efficiency, reduces noise, and enhances control accuracy and reliability. It also effectively shortens the length of the stator core and frame, reduces processing steps and difficulty, and saves axial space in the motor. In other words, the dual-winding, double-pole speed-regulating motor for fans provided by this utility model has advantages such as convenient installation, high efficiency, low noise, good dust and water resistance, and a reasonable and easily adjustable counterweight structure. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of a double-winding, double-pole speed-regulating motor for a fan provided in an embodiment of this utility model.

[0019] Figure label:

[0020] 1-Main spindle; 2-Type A key; 3-Second skeleton oil seal; 4-First deep groove ball bearing; 5-Flange end cover; 6-Cast aluminum rotor; 7-Stator coil; 8-Waterproof connector; 9-Phillips head recessed screw; 12-Junction box cover; 13-Junction box base; 14-Stator core; 15-Rear end cover; 16-Second deep groove ball bearing; 17-Wave spring; 18-First skeleton oil seal; 19-Protective cover; 20-Phillips head screw; 21-Hex head bolt; 22-Base; 23-Eye contact screw. Detailed Implementation

[0021] The dual-winding, dual-pole speed-regulating motor provided in this utility model embodiment is based on a conventional multi-stage speed-regulating motor with only one winding. It adopts two sets of windings, with two independent windings of different pole numbers embedded in the stator slots. By energizing the two sets of windings at different time periods, two pole numbers can be obtained, thereby realizing two different output speeds.

[0022] In addition, due to the special operating environment of the motor, there is external airflow to cool the motor. Therefore, the IC418 cooling method is adopted in the structure, eliminating the ordinary motor fan and fan cover, effectively shortening the motor length and making the structure more compact. While maintaining the same performance, the body length is greatly shortened, which effectively improves the space utilization of the equipment and makes the motor easier to adapt to the compact space layout, facilitating the installation and maintenance of the motor.

[0023] For ease of understanding, the following description, in conjunction with the accompanying drawings, provides a detailed description of the dual-winding bipolar speed-regulating motor for fans provided in the embodiments of this utility model.

[0024] This utility model embodiment provides a double-winding, double-pole speed-regulating motor for fans, such as... Figure 1 As shown, the stator slot has two independent windings with different pole pairs, and each winding is Y-connected; specifically, the stator core with windings is pressed into the machine base 22, and the junction box 13 is assembled to the top of the machine base 22.

[0025] The rear end of the spindle 1 has no fan or fan cover, which effectively shortens the length of the motor structure and makes the motor structure more compact. It also effectively solves the problem of motor heat generation based on the characteristics of the motor itself. Furthermore, the rear end cover 15 at the shaft end is equipped with a protective cover 19 using crosshead screws 20, so that the motor can achieve an IP65 protection level.

[0026] Compared with the prior art, the dual-winding bipolar speed-regulating motor for wind turbines described in this embodiment of the invention has the following advantages:

[0027] In the dual-winding, dual-pole speed-regulating motor for fans provided in this embodiment of the utility model, since the stator slots are embedded with two independent windings of different pole pairs, and each winding adopts a Y-type connection, specifically, the winding stator core is pressed into the machine base 22, and the junction box 13 is assembled to the top of the machine base 22. The rear end of the main shaft 1 has no fan or fan cover, and the rear end cover 15 at the shaft end is fitted with a protective cover 19 using crosshead screws 20; therefore, the dual-winding, dual-pole speed-regulating motor for fans provided in this utility model, through its speed regulation method and cooling method, greatly reduces the size and cost of the speed-regulating motor, effectively shortens the motor length, and makes the structure more compact. While maintaining the same performance, the body length is greatly shortened, effectively improving the space utilization rate of the equipment, making the motor easier to adapt to compact space layouts, and facilitating the installation and maintenance of the motor. In other words, the dual-winding, double-pole speed-regulating motor for fans provided in this embodiment of the invention enables a three-phase asynchronous motor to select a more suitable operating state at different speeds, thereby achieving better working efficiency. This effectively improves motor efficiency, reduces noise, and enhances control accuracy and reliability. It also effectively shortens the length of the stator core and frame, reduces processing steps and difficulty, and saves axial space in the motor. In other words, the dual-winding, double-pole speed-regulating motor for fans provided in this embodiment of the invention has advantages such as convenient installation, high efficiency, low noise, good dust and water resistance, and a reasonable and easily adjustable counterweight structure.

[0028] In practical applications, such as Figure 1 As shown, the shaft extension end of the main shaft 1 is equipped with a type A flat key 2; the bearing chamber of the rear end cover 15 is equipped with a rotor, and the two ends of the rotor are press-fitted with a first deep groove ball bearing 4 and a second deep groove ball bearing 16; the oil seal position of the rear end cover 15 is equipped with a first skeleton oil seal 18 and fixed with a wave spring 17, and the rear end cover 15 equipped with the first skeleton oil seal 18 is locked to the machine base 22 by a hexagonal head bolt 21 with a spring washer.

[0029] Among them, such as Figure 1 As shown, the above-mentioned winding stator core includes: stator core 14 and stator coil 7; the stator coil 7 is wired in a double-layer manner, with the lower coil being a single-layer cross-type and the upper coil being a single-layer chain-type.

[0030] Specifically, such as Figure 1 As shown, a first deep groove ball bearing 4 is installed in the bearing chamber of the flange end cover 5, and a second skeleton oil seal 3 is installed in the oil seal position of the flange end cover 5. The flange end cover 5 equipped with the first deep groove ball bearing 4 is locked and fixed to the machine base 22.

[0031] Furthermore, such as Figure 1 As shown, the junction box cover 12 is mounted on the junction box base 13 by a crosshead recessed screw 9, and the junction box base 13 is equipped with a waterproof connector 8 made of polyamide resin.

[0032] Furthermore, such as Figure 1 As shown, the rotor includes a main shaft 1 and a cast aluminum rotor 6, with the cast aluminum rotor 6 sleeved on the main shaft 1. At the same time, the two ends of the cast aluminum rotor 6 are press-fitted with a first deep groove ball bearing 4 and a second deep groove ball bearing 16 to fix the main shaft 1 and the rotor, thereby effectively preventing the rotor from axial movement.

[0033] The main body of the cast aluminum rotor 6 is made of 50W800 silicon steel sheets stacked together and aluminum-manganese alloy is cast. The aluminum-manganese alloy and silicon steel sheets are integrally formed. The two ends of the aluminum cage include rotor end rings, fan blades and balance columns, thereby realizing bipolar speed regulation of the three-phase asynchronous motor and reducing the damage to the motor itself, while ensuring that the generator operates more safely and efficiently.

[0034] The rotor has an outer diameter of 119.4 mm and an inner diameter of 38 mm. The length of the lamination portion of the cast aluminum rotor 6 is 170 mm. The rotor laminations consist of a lamination structure formed by rotor lamination slots and rotor lamination heat dissipation slots. There are 28 rotor lamination slots, evenly distributed in a ring shape. The slots are concave, with a slot opening width of 1.00 mm, a slot opening height of 0.50 mm, a slot shoulder width of 7.0 mm, a slot shoulder angle of 20°, and a depth at the top of the slot. The diameter of the rotor lamination is 16.5 mm, and the bottom width of the slot is 3.60 mm. There is one rotor lamination heat dissipation slot, which is a trapezoidal slot with a width of 5 mm and heights of 2.2 mm and 3 mm respectively, with its centerline aligned with the central axis of the rotor lamination slot. The stator core 14 in the winding stator core has an outer diameter of 175 mm, an inner diameter of 120 mm, and a length of 170 mm. The stator core 14 is formed by stacking stator laminations. The stator lamination slots and snap-fit ​​slots together form the lamination structure. The core has 36 slots evenly distributed in a ring shape. The slots are semi-closed pear-shaped, with a slot opening width of 2.80 mm, a slot opening height of 0.7 mm, a top depth of 16.85 mm, a shoulder width of 6.0 mm, a shoulder angle of 30°, and a bottom width of 7.9 mm. The stator snap-fit ​​slots also have grooves, and the centerline of the stator snap-fit ​​slot passes through the edge of the groove and through the center of the two slots of the stator lamination. The stator coil... 7. Two forms are adopted: single-layer cross-type and single-layer chain-type. There are a total of 6 stator coils with wire diameters of 0.63mm and 0.83mm. The wire gauge is QZY-2 / 180—Ø0.63 and QZY-2 / 180—Ø0.83 enameled wire. The number of turns of the 4-pole coil is 48 turns and the number of turns of the 6-pole coil is 65 turns. There are 36 stator slots and the number of poles is 4 / 6. For the 4-pole coil, it is distributed in the lower layer of the stator slots, and for the 6-pole coil, it is distributed in the upper layer of the stator slots.

[0035] Furthermore, in the dual-winding dual-pole speed-regulating motor for fans provided in this embodiment of the invention, the rotor of the dual-winding dual-speed induction motor is a squirrel-cage type, and its rotor pole number can automatically match the stator pole number; the dual-winding pole-changing speed regulation can also be made into three-speed or even four-speed motors, such as variable speed motors with pole numbers of 8 / 4 / 2, 8 / 6 / 4, 10 / 8 / 6 / 4 and 12 / 8 / 6 / 4, etc.; the dual-winding dual-pole speed-regulating motor has simple wiring and convenient control. Due to its advantage of not being easily affected by external interference, the dual-winding motor is more suitable for some special environments, such as occasions with high noise requirements, occasions that need to operate at low speeds, and occasions that require more precise speed control;

[0036] The speed of the motor can be changed by altering the connection method of the motor windings to change the number of pole pairs of the stator rotating magnetic field. The speed of the motor is changed by changing the connection method of the windings, that is, by changing the number of pole pairs of the motor rotating magnetic field. The dual-speed motor normally runs at a low speed and sometimes runs at a high speed, which is mainly achieved by changing the winding connection method of the motor coil through the switching of the following external control circuits.

[0037] The 3.6kW / 1.8kW, 4 / 6-pole double-pole speed-regulating motor, through the adoption of reasonable stator and rotor slot numbers and sinusoidal windings, reduces losses and achieves higher efficiency than ordinary motors, averaging nearly 5% higher. Energy consumption is reduced by more than 30% on average compared to ordinary motors. It is used to solve the problems of low efficiency and high long-term operating costs of three-phase asynchronous motors. It effectively shortens the length of the stator core and frame, reduces processing steps, lowers processing difficulty, and saves axial space of the motor.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A double-winding, double-pole speed-regulating motor for a fan, characterized in that, The stator slots are embedded with two independent windings of different pole pairs, and each winding is Y-connected; specifically, the winding stator core is pressed into the machine frame, and the junction box is assembled to the top of the machine frame. There is no fan or fan cover at the rear end of the spindle, and the rear end cover at the spindle end is fitted with a protective cover using crosshead screws.

2. The double-winding, double-pole speed-regulating motor for wind turbines according to claim 1, characterized in that, The spindle is fitted with a type A flat key at its shaft extension end; a rotor is fitted in the bearing chamber of the rear end cover, and a first deep groove ball bearing and a second deep groove ball bearing are press-fitted at both ends of the rotor; a first skeleton oil seal is fitted at the oil seal position of the rear end cover, and a wave spring is fixed thereon; the rear end cover fitted with the first skeleton oil seal is locked to the machine base by a hexagonal head bolt with a spring washer.

3. The double-winding, double-pole speed-regulating motor for wind turbines according to claim 2, characterized in that, The wound stator core includes: a stator core and stator coils; the stator coils are wired in a double-layer configuration, with the lower coil being a single-layer cross-type and the upper coil being a single-layer chain-type.

4. The double-winding, double-pole speed-regulating motor for wind turbines according to claim 3, characterized in that, The first deep groove ball bearing is installed in the bearing chamber of the flange end cover, and the second skeleton oil seal is installed in the oil seal position of the flange end cover. The flange end cover with the first deep groove ball bearing is locked and fixed to the machine base.

5. The double-winding, double-pole speed-regulating motor for wind turbines according to claim 1, characterized in that, The junction box cover is mounted on the junction box base using Phillips head recessed screws, and the junction box base is equipped with a waterproof connector made of polyamide resin.

6. The double-winding, double-pole speed-regulating motor for wind turbines according to claim 2, characterized in that, The rotor includes the main shaft and the cast aluminum rotor, and the cast aluminum rotor is sleeved on the main shaft. At the same time, the first deep groove ball bearing and the second deep groove ball bearing are press-fitted at both ends of the cast aluminum rotor. The main body of the cast aluminum rotor is made of 50W800 silicon steel sheets stacked together and aluminum-manganese alloy is cast. The aluminum-manganese alloy and silicon steel sheets are integrally formed. The two ends of the aluminum cage include rotor end rings, fan blades and balance columns.

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