High-speed positioning motor

Abstract

The utility model relates to a high-speed positioning motor, which comprises a rotor assembly, a stator assembly, a speed measurement module and an end cover, and is characterized in that the rotor assembly is supported and arranged in the stator assembly through a bearing and is provided with a magnetic field signal generation unit and a rotating speed signal source which synchronously rotate along with the rotor assembly; the end cover is provided with an angle sensor used for detecting a magnetic field signal and outputting position information of the rotor assembly, and the axis of an electronic signal bin of the angle sensor and the axis of the magnetic field signal generating unit are coaxially arranged. The speed measurement module measures the rotating speed of the rotor assembly by detecting a signal of the rotating speed signal source. According to the technical scheme, high-speed centrifugal operation can be achieved, and the positioning function of the high-speed centrifugal machine can be accurately and stably achieved at low cost.

Description

Technical Field

[0001] This utility model belongs to the field of centrifuge motor positioning technology, specifically relating to a high-speed positioning motor. Background Technology

[0002] A centrifuge is a device that uses centrifugal force to separate liquid suspensions of different densities and particle sizes. The sample is placed inside the centrifuge rotor. The rotor is mounted on top of the motor shaft.

[0003] Currently, positioning centrifuges are widely used in petroleum, chemical, pharmaceutical, food, and sample testing automation fields. Especially in automated sample pretreatment applications, the requirements for sample centrifugation efficiency are increasingly stringent, with the positioning accuracy and stability of the rotor after each centrifugation cycle being a key indicator. While existing solutions using custom-designed high-performance servo motors and positioning mechanisms can meet the positioning accuracy and stability requirements, these solutions are prohibitively expensive. Furthermore, most custom-designed high-performance servo motors are imported brands, resulting in high maintenance costs, and their maximum speed does not exceed 8000 rpm. To date, a high-speed centrifuge motor (speed greater than or equal to 10000 rpm) has not yet been provided. There is an urgent market need to implement positioning functionality for high-speed centrifuges (maximum speed greater than or equal to 10000 rpm).

[0004] In summary, there is an urgent need to provide a high-speed positioning motor that can achieve high-speed centrifugation operations and also provide low-cost, accurate, and stable positioning for high-speed centrifuges. Utility Model Content

[0005] The purpose of this invention is to provide a high-speed positioning motor that can achieve high-speed centrifugation operation and also achieve the positioning function of high-speed centrifuges in a low-cost, accurate and stable manner.

[0006] The above objective is achieved through the following technical solution: a high-speed positioning motor, comprising a rotor assembly, a stator assembly, a speed measuring module, and an end cover. The rotor assembly is supported by bearings and disposed inside the stator assembly. The rotor assembly is provided with a magnetic field signal generating unit and a speed signal source that rotate synchronously with the rotor assembly. The end cover is provided with an angle sensor for detecting the magnetic field signal and outputting the position information of the rotor assembly. The axis of the electronic signal chamber of the angle sensor is coaxially arranged with the axis of the magnetic field signal generating unit. The speed measuring module realizes the speed measurement of the rotor assembly by detecting the signal from the speed signal source.

[0007] This invention is used in high-speed centrifuges. During operation, when the high-speed positioning motor receives a high-speed electrical power signal, the rotor assembly begins to rotate at high speed, entering the high-speed centrifugation stage. The directly connected components, magnetic field signal generator, and speed signal source rotate synchronously at high speed. The frequency of the speed signal source's signal change is proportional to the rotor speed. The speed measurement module detects the frequency of the speed signal source's limit change and outputs a speed signal to the control system in real time to ensure operational stability. The control system presets a deceleration threshold (e.g., 1000 rpm). When centrifugation is completed or a positioning command is received, the motor begins to decelerate. The speed measurement module continuously monitors the speed. When the speed drops below the threshold, the positioning mode is triggered, and the control system switches from high-speed mode to low-speed positioning mode, reducing the motor drive current. The rotor assembly enters a controllable deceleration stage, and the magnetic field signal generator rotates synchronously with the rotor assembly. Field changes are detected in real time by an angle sensor, generating a position signal. The periodic linear signal output by the angle sensor is converted into a real-time rotor angle value and transmitted to the control system. The control system uses a PID algorithm or a fuzzy control algorithm to compare the target position angle with the current angle and dynamically adjust the deceleration rate to avoid overshoot. When entering precise stop and locking, when the rotor assembly speed drops to an extremely low range (e.g., <20 rpm), the control system enters the fine-tuning stage. First, angle matching is performed. Based on the real-time signal from the angle sensor, the deviation between the current rotor position and the target position is calculated. During the application process, a short-term reverse current pulse can also be applied to counteract inertia and gradually approach the target angle. When the rotor assembly reaches the target position (deviation ≤ ±1°), the motor stops completely. After the angle sensor signal confirms the position, the control system locks the rotor assembly and prevents deviation through a mechanical braking mechanism (e.g., an electromagnetic brake).

[0008] This invention can realize high-speed centrifugation operation and also achieve the positioning function of high-speed centrifuges in a low-cost, accurate and stable manner, making it suitable for efficient and accurate positioning of centrifuges.

[0009] A further technical solution is that the extended end of the rotor assembly is provided with a connector, and the magnetic field signal generating unit is connected to the rotor assembly through the connector. The end cover includes a lower end cover, and the lower end cover is provided with a mounting base. The angle sensor is mounted on the mounting base and is positioned at a predetermined distance from the magnetic field signal generating unit. This configuration, through a non-contact sensing design, allows for a predetermined distance of 1-3mm, eliminating mechanical and electrical wear, enabling high-speed operation without speed limits, and extending service life.

[0010] A further technical solution is that the mounting base has an inner stop, and the lower end cover has an outer stop, with the inner and outer stops aligned and connected. The lower end cover and mounting base employ an inner and outer stop design and are aligned to ensure that the axis of the magnetic field signal generating unit is strictly coaxial with the axis of the angle sensor, thus improving operational stability and signal stability.

[0011] A further technical solution involves using a magnetic ring as the speed signal source. The magnetic ring is fitted onto the connector, and the lower end cover is also equipped with a mounting bracket. The speed measuring module is fixed to the mounting bracket and positioned at a predetermined distance from the magnetic ring. In practical applications, the speed measuring module is fixed to the mounting bracket with screws, and the mounting bracket and the lower end cover are securely connected by screws, ensuring that the speed measuring module can stably output the motor speed signal when the rotor assembly is rotating at high speed. The speed measuring module and the magnetic ring also employ a non-contact sensing design to eliminate mechanical wear, achieve high-speed operation without speed limits, and extend component lifespan. The speed signal source can be a multi-pole magnetic ring with alternating N / S poles on its surface, and the magnetic field change frequency is linearly related to the rotor speed. The speed measuring module is fixed to the mounting bracket and directly connected to the rotor assembly, reducing intermediate transmission links.

[0012] A further technical solution is that the speed measuring module includes a Hall sensor or a magnetoresistive element. In this way, the speed measuring module detects the frequency of changes in the magnetic field of the magnetic ring through the Hall sensor or magnetoresistive element, converting the mechanical rotation into an electrical pulse signal. The pulse frequency is proportional to the rotational speed, thereby outputting rotational speed data in real time.

[0013] A further technical solution is that the magnetic field signal generating unit is a magnetic head, and the change in magnetic field when the magnetic head rotates synchronously with the rotor assembly is detected in real time by an angle sensor, which generates a periodic absolute position signal from 0 to 360°.

[0014] With this setup, after centrifugation, the motor's rotor assembly is in a free-rotating state. When the centrifuge executes a positioning command, the rotor assembly begins to rotate slowly for positioning, and the magnetic head rotates synchronously. Since the magnetic head axis and the electronic signal chamber axis of the angle sensor are coaxial, when the magnetic head is stationary or rotating, the angle sensor outputs a stable periodic linear electrical signal, which is converted into a periodic angle signal of 0-360°. This signal is an absolute value signal and is retained even when power is off. By reading this periodic angle signal in real time, the real-time position of the motor's rotor assembly can be read. By matching the appropriate control algorithm and actuator, accurate and reliable positioning of the rotor assembly can be achieved.

[0015] In practical applications, the following hardware interfaces can be used: Angle sensor (connected to the I / O module of the upper controller or a dedicated motion control card via cable); Communication protocol: supports analog or digital protocols to achieve high-speed signal transmission; Control logic: the upper system matches a preset algorithm (such as PID control) based on the angle signal, drives the motor to perform positioning actions, and dynamically adjusts the speed by feeding back the rotational speed through the speed measurement module.

[0016] A further technical solution is that the high-speed positioning motor also includes a motor line for receiving high-speed electrical power signals.

[0017] A further technical solution is that the end cover also includes an upper end cover, and the upper end cover and the lower end cover form a motor housing.

[0018] Compared with existing technologies, the implementation of this utility model can achieve high-speed centrifugation operations and also achieve the positioning function of high-speed centrifuges in a low-cost, accurate and stable manner. Attached Figure Description

[0019] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is a schematic diagram of the structure of a high-speed positioning motor according to one embodiment of the present invention;

[0021] Figure 2 for Figure 1 The main intention of the high-speed positioning motor involved in the process;

[0022] Figure 3 for Figure 2 The high-speed positioning motor involved is shown in the cross-sectional view along the NN plane.

[0023] In the picture:

[0024] 1. Rotor assembly; 2. Upper end cover; 3. Stator assembly; 4. Lower end cover

[0025] 5. Motor wire; 6. Magnetic ring; 7. Speed ​​measuring module; 8. Mounting bracket

[0026] 9 Connector 10 Magnetic head 11 Angle sensor 12 Mounting base Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings. This description is merely illustrative and explanatory, and should not be construed as limiting the scope of protection of the present invention. Furthermore, those skilled in the art can combine the features in the embodiments described herein and in different embodiments according to the description in this document.

[0028] The embodiments of this utility model are as follows, please refer to... Figures 1-3A high-speed positioning motor includes a rotor assembly 1, a stator assembly 3, a speed measuring module 7, and an end cover. The rotor assembly 1 is supported by bearings and disposed inside the stator assembly 3. The rotor assembly 1 is provided with a magnetic field signal generating unit and a speed signal source that rotate synchronously with the rotor assembly 1. The end cover is provided with an angle sensor 11 for detecting the magnetic field signal and outputting the position information of the rotor assembly 1. The axis of the electronic signal chamber of the angle sensor 11 is coaxial with the axis of the magnetic field signal generating unit. The speed measuring module 7 realizes the speed measurement of the rotor assembly 1 by detecting the signal of the speed signal source.

[0029] This invention is used in a high-speed centrifuge. During operation, when the high-speed positioning motor receives a high-speed electrical power signal, the rotor assembly 1 begins to rotate at high speed, entering the high-speed centrifugation stage. The directly connected connector 9, magnetic field signal generator, and speed signal source rotate synchronously at high speed. The frequency of the speed signal source's signal change is proportional to the rotor speed. The speed measurement module 7 detects the frequency of the speed signal source's limit change and outputs a speed signal to the control system in real time to ensure operational stability. The control system presets a deceleration threshold (e.g., 1000 rpm). When the centrifugation operation is completed or a positioning command is received, the motor begins to decelerate. The speed measurement module 7 continuously monitors the speed. When the speed drops below the threshold, the positioning mode is triggered, and the control system switches from high-speed mode to low-speed positioning mode, reducing the motor drive current. The rotor assembly 1 enters a controllable deceleration stage, and the magnetic field signal generator rotates synchronously with the rotor assembly 1, its magnetic field changing... The rotor is detected in real time by angle sensor 11, which generates a position signal. The periodic linear signal output by angle sensor 11 is converted into the real-time angle value of the rotor and transmitted to the control system. The control system uses PID algorithm or fuzzy control algorithm to compare the target position angle with the current angle and dynamically adjust the deceleration rate to avoid overshoot. When entering precise stop and locking, when the rotor assembly 1 speed drops to a very low range (e.g., <20rpm), the control system enters the fine-tuning stage. First, angle matching is performed. Based on the real-time signal of angle sensor 11, the deviation between the current position of the rotor and the target position is calculated. During the application process, a short-time reverse current pulse can also be applied to counteract inertia and gradually approach the target angle. When rotor assembly 1 reaches the target position (deviation ≤±1°), the motor stops completely. After the angle sensor 11 signal confirms the position, the control system locks rotor assembly 1 and prevents deviation through mechanical braking mechanism (e.g., electromagnetic brake).

[0030] This invention can realize high-speed centrifugation operation and also achieve the positioning function of high-speed centrifuges in a low-cost, accurate and stable manner, making it suitable for efficient and accurate positioning of centrifuges.

[0031] Based on the above embodiments, in another embodiment of the present invention, such as Figure 3The rotor assembly 1 has a connector 9 at its extended end. The magnetic field signal generating unit is connected to the rotor assembly 1 through the connector 9. The end cover includes a lower end cover 4, which has a mounting base 12. The angle sensor 11 is mounted on the mounting base 12 and is positioned at a predetermined distance from the magnetic field signal generating unit. This configuration, through non-contact sensing design, allows for a predetermined distance of 1-3mm, eliminating mechanical and electrical wear, enabling high-speed operation without speed limits, and extending service life.

[0032] Based on the above embodiments, in another embodiment of the present invention, such as Figure 3 The mounting base 12 has an inner stop, and the lower end cover 4 has an outer stop, with the inner and outer stops aligned and connected. The lower end cover 4 and the mounting base 12 adopt an inner and outer stop design and are aligned to ensure that the axis of the magnetic field signal generating unit is strictly coaxial with the axis of the angle sensor 11, thereby improving operational stability and signal stability.

[0033] Based on the above embodiments, in another embodiment of the present invention, such as Figure 3 The rotational speed signal source is a magnetic ring 6, which is sleeved on the connector 9. The lower end cover 4 is also provided with a mounting bracket 8. The speed measuring module 7 is fixed on the mounting bracket 8 and is set at a predetermined distance from the magnetic ring 6.

[0034] In practical applications, the speed measuring module 7 is fixed to the mounting bracket 8 with screws. The mounting bracket 8 and the lower end cover 4 are also fastened together with screws, ensuring that the speed measuring module 7 can stably output the motor speed signal when the rotor assembly 1 is rotating at high speed. The speed measuring module 7 and the magnetic ring 6 also adopt a non-contact sensing design to eliminate mechanical wear, achieve high-speed operation without speed limit, and extend the service life of the components. The speed signal source can be a multi-pole magnetic ring 6, whose surface has alternating N / S poles, and the frequency of magnetic field change is linearly related to the rotor speed. The speed measuring module 7 is fixed to the mounting bracket 8 and directly connected to the rotor assembly 1, reducing intermediate transmission links.

[0035] Based on the above embodiments, in another embodiment of this utility model, the speed measuring module 7 includes a Hall sensor or a magnetoresistive element. Thus, the speed measuring module 7 detects the frequency of magnetic field changes in the magnetic ring 6 through the Hall sensor or magnetoresistive element, converting the mechanical rotation into an electrical pulse signal. The pulse frequency is proportional to the rotational speed, thereby outputting rotational speed data in real time.

[0036] Based on the above embodiments, in another embodiment of the present invention, such as Figure 3The magnetic field signal generating unit is a magnetic head 10. The magnetic field changes of the magnetic head 10 as it rotates synchronously with the rotor assembly 1 are detected in real time by an angle sensor 11. The angle sensor 11 generates a periodic absolute position signal from 0 to 360°. With this configuration, after centrifugation, the rotor assembly 1 of the motor is in a free-rotating state. When the centrifuge executes a positioning command, the rotor assembly 1 begins to rotate slowly for positioning, and the magnetic head 10 rotates synchronously. Since the axis of the magnetic head 10 is coaxial with the axis of the electronic signal chamber of the angle sensor 11, when the magnetic head 10 is stationary or rotating, the angle sensor 11 outputs a stable periodic linear electrical signal, which is converted into a periodic angle signal from 0 to 360°. This signal is an absolute value signal and is retained even when power is off. By reading this periodic angle signal in real time, the real-time position of the rotor assembly 1 of the motor can be read. Matching the appropriate control algorithm and actuator allows for accurate and reliable positioning of the rotor assembly 1.

[0037] In practical applications, the following hardware interface can be used: Angle sensor (connected to the I / O module of the upper controller or a dedicated motion control card via cable); Communication protocol: supports analog or digital protocols to achieve high-speed signal transmission; Control logic: the upper system matches a preset algorithm (such as PID control) according to the angle signal, drives the motor to perform positioning actions, and dynamically adjusts the speed by feeding back the rotational speed through the speed measurement module 7.

[0038] Based on the above embodiments, in another embodiment of the present invention, such as Figure 1 The high-speed positioning motor also includes a motor line 5 for receiving high-speed electrical power signals.

[0039] Based on the above embodiments, in another embodiment of the present invention, such as Figure 1 The end cover also includes an upper end cover 2, which together with the lower end cover 4 forms the motor housing.

[0040] Specific Implementation: A high-speed positioning motor with a maximum speed of 18,000 rpm is applied to a high-speed refrigerated centrifuge. With a load of 6 x 50ml angle rotors, the maximum speed is 13,000 rpm. After one hour of normal centrifugation, the angle rotors are positioned at 6 stations. Actual testing shows an absolute positioning accuracy of ±0.3° and a repeatability of ±0.5°, demonstrating extremely high positioning precision. This high-speed positioning motor has low manufacturing costs and enables both high-speed centrifugation and precise, repeatable positioning.

[0041] Compared with existing technologies, the implementation of this utility model can achieve high-speed centrifugation operations and also achieve the positioning function of high-speed centrifuges in a low-cost, accurate and stable manner.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-speed positioning motor, characterized in that, The device includes a rotor assembly, a stator assembly, a speed measuring module, and an end cover. The rotor assembly is supported by bearings and installed inside the stator assembly. The rotor assembly is equipped with a magnetic field signal generating unit and a speed signal source that rotate synchronously with the rotor assembly. The end cover is equipped with an angle sensor for detecting the magnetic field signal and outputting the position information of the rotor assembly. The axis of the electronic signal chamber of the angle sensor is coaxial with the axis of the magnetic field signal generating unit. The speed measuring module measures the speed of the rotor assembly by detecting the signal from the speed signal source.

2. The high-speed positioning motor according to claim 1, characterized in that, The rotor assembly has a connector at its extended end, and the magnetic field signal generating unit is connected to the rotor assembly through the connector. The end cover includes a lower end cover, and the lower end cover has a mounting base. The angle sensor is mounted on the mounting base and is set at a predetermined distance from the magnetic field signal generating unit.

3. The high-speed positioning motor according to claim 2, characterized in that, The mounting base has an inner stop, and the lower end cover has an outer stop, with the inner stop and the outer stop being aligned and connected.

4. The high-speed positioning motor according to claim 2 or 3, characterized in that, The speed signal source is a magnetic ring, which is sleeved on the connector. The lower end cover is also provided with a mounting bracket. The speed measuring module is fixed on the mounting bracket and set at a predetermined distance from the magnetic ring.

5. The high-speed positioning motor according to claim 4, characterized in that, The speed measurement module includes a Hall sensor or a magnetoresistive element.

6. The high-speed positioning motor according to claim 1, characterized in that, The magnetic field signal generating unit is a magnetic head. The change in magnetic field when the magnetic head rotates synchronously with the rotor assembly is detected in real time by an angle sensor. The angle sensor generates a periodic absolute position signal from 0 to 360°.

7. The high-speed positioning motor according to claim 1, characterized in that, The high-speed positioning motor also includes a motor line for receiving high-speed electrical power signals.

8. The high-speed positioning motor according to claim 1, characterized in that, The end cover also includes an upper end cover, which together with the lower end cover form the motor housing.

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