CN-224218261-U - High-speed positioning motor

CN224218261UCN 224218261 UCN224218261 UCN 224218261UCN-224218261-U

Abstract

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

Inventors

SUN YUFANG
LIN JIANGBO
HU XUAN
WU QIANG
HU CHANGCHUN

Assignees

北京大学
长沙金泰时仪器有限公司

Dates

Publication Date: 20260508
Application Date: 20250528

Claims (8)

1. The utility model provides a high-speed location motor, its characterized in that, includes rotor subassembly, stator module, speed measuring module and end cover, rotor subassembly passes through the bearing to be supported and sets up inside the stator module, rotor subassembly is equipped with along with rotor subassembly synchronous rotation's magnetic field signal generation unit and rotational speed signal source, be equipped with on the end cover and be used for detecting magnetic field signal and output rotor subassembly positional information's angle sensor, angle sensor's electronic signal storehouse's axis with the coaxial setting of axis of magnetic field signal generation unit, speed measuring module is through detecting the signal realization of rotational speed signal source rotor subassembly's rotational speed measurement.
2. The high-speed positioning motor of claim 1, wherein the protruding end of the rotor assembly is provided with a connecting member, the magnetic field signal generating unit is connected with the rotor assembly through the connecting member, the end cover comprises a lower end cover provided with a mounting base, and the angle sensor is arranged on the mounting base and is arranged at a predetermined distance from the magnetic field signal generating unit.
3. The high-speed positioning motor of claim 2, wherein the mounting base is provided with an inner spigot and the lower end cover is provided with an outer spigot, and the inner spigot is connected with the outer spigot in a centered manner.
4. The high-speed positioning motor according to claim 2 or 3, wherein the rotation speed signal source is a magnetic ring, the magnetic ring is sleeved on the connecting piece, the lower end cover is further provided with a mounting bracket, and the speed measuring module is fixed on the mounting bracket and is arranged at a preset distance from the magnetic ring.
5. The high speed positioning motor of claim 4, wherein the speed measurement module comprises a hall sensor or a magneto-resistive element.
6. The high-speed positioning motor of claim 1, wherein the magnetic field signal generating unit is a magnetic head, and the magnetic field change of the magnetic head when the magnetic head rotates synchronously with the rotor assembly is detected in real time by an angle sensor, and the angle sensor generates a periodic absolute value position signal of 0-360 degrees.
7. The high speed positioning motor of claim 1, further comprising a motor wire for interfacing a high rotational speed electrical power signal.
8. The high speed positioning motor of claim 1, wherein the end cap further comprises an upper end cap, the upper end cap and lower end cap forming a motor housing.

Description

High-speed positioning motor Technical Field The utility model belongs to the technical field of positioning of centrifugal machines and particularly relates to a high-speed positioning motor. Background A centrifuge is a device that uses centrifugal force to separate liquid suspensions of different densities and particle sizes. The sample is placed in the centrifuge rotor. The rotor is arranged at the top end of the motor shaft. The positioning centrifuge has wide application in the fields of petroleum, chemical industry, pharmacy, food, sample detection automation and the like. In particular, in the application of pretreatment automation of sample detection, the requirement on the centrifugal treatment efficiency of the sample is higher and higher, wherein the positioning precision and stability of the rotating cup after the completion of each centrifugation are one of key indexes. The high cost scheme of the conventional customized high-performance servo motor and positioning mechanism can meet the positioning accuracy and stability indexes, but the scheme has high cost, most of customized high-performance servo motors are imported brands, the maintenance cost is high, the maximum rotating speed is not more than 8000rpm, a high-speed centrifugal motor (the rotating speed is more than or equal to 10000 rpm) cannot be provided until now, and the positioning function of a high-speed centrifugal machine (the maximum rotating speed is more than or equal to 10000 rpm) is urgently needed to be realized in the market at present. In view of the foregoing, there is a need for a high-speed positioning motor that can perform high-speed centrifugation operation, and that can perform positioning functions of a high-speed centrifuge with low cost and precision and stability. Disclosure of utility model The utility model aims to provide a high-speed positioning motor which can realize high-speed centrifugal operation, can realize the positioning function of a high-speed centrifugal machine accurately and stably with low cost. The high-speed positioning motor comprises a rotor assembly, a stator assembly, a speed measuring module and an end cover, wherein the rotor assembly is supported and arranged inside the stator assembly through a bearing, the rotor assembly is provided with a magnetic field signal generating unit and a rotating speed signal source which synchronously rotate along with the rotor assembly, the end cover is provided with an angle sensor for detecting magnetic field signals and outputting position information of the rotor assembly, the axis of an electronic signal bin of the angle sensor is coaxially arranged with the axis of the magnetic field signal generating unit, and the speed measuring module realizes rotating speed measurement of the rotor assembly by detecting signals of the rotating speed signal source. When the high-speed positioning motor is connected with a high-speed electric power signal, the rotor assembly starts to rotate at a high speed and enters a high-speed centrifugal operation stage, the connecting piece, the magnetic field signal generating unit and the rotating speed signal source which are directly connected with the rotor assembly synchronously rotate at a high speed, the signal change frequency of the rotating speed signal source is in direct proportion to the rotating speed of the rotor, and the speed measuring module outputs the rotating speed signal to the control system in real time by detecting the limited number change frequency of the rotating speed signal source so as to ensure the running stability; the control system presets a deceleration threshold (such as 1000 rpm), when the centrifugal operation is finished or a positioning instruction is received, the motor starts decelerating, the speed measuring module continuously monitors the rotating speed, when the rotating speed is detected to be lower than the threshold, the positioning mode is triggered, the control system switches from the high-speed mode to the low-speed positioning mode, the motor driving current is reduced, the rotor assembly enters a controllable deceleration stage, the magnetic field signal generating unit synchronously rotates along with the rotor assembly, the magnetic field change is detected in real time by the angle sensor, a position signal is generated, the periodic linear signal output by the angle sensor is converted into a rotor real-time angle value, the rotor real-time angle value is transmitted to the control system, the control system compares the angle of a target station with the current angle through a PID algorithm or a fuzzy control algorithm, the deceleration rate is dynamically adjusted to avoid overshoot, when the rotor assembly rotates to an extremely low range (such as <20 rpm) when the rotating speed of the rotor assembly is detected to be lower than the threshold, the angle matching is firstly carried out, the rotor assembly is calculated according to the real-time signa