scholarly journals Design and implementation of speed fluctuation reduction for a ball screw feed system at low-speed operation

2020 ◽  
Vol 11 (1) ◽  
pp. 163-172
Author(s):  
Zhaoguo Wang ◽  
Xianying Feng ◽  
Fuxin Du ◽  
Hui Li ◽  
Zhe Su
Keyword(s):  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Servo System ◽  
Ball Screw ◽  
Motor Speed ◽  
Feed System ◽  
Low Velocity ◽  
Motor Torque ◽  
Low Speed ◽  
Speed Fluctuation

Abstract. In the high-precision servo feed system, when the permanent magnet synchronous motor (PMSM) is operated at low speed in the classical drive feed system (CDFS), the speed fluctuation caused by the motor torque harmonics seriously affects the speed smoothness of the servo system. In this paper, a novel double-drive differential feed system (DDFS) is proposed to effectively suppress the effect of torque harmonics of PMSM on speed fluctuation of the linear feed system at low-speed operation. Firstly, the effect of motor torque harmonics on motor speed for the DDFS is analyzed by the sensitivity function of the servo system, which indicates that the torque harmonics have little effect on the motor speed at high-speed operation. Then, in the DDFS, we make two motors rotate in the same direction at high speed and differentially synthesize at the ball screw to obtain low-velocity linear motion. Compared with the CDFS, the DDFS can suppress the effect of motor torque harmonics on speed fluctuation of the table and improve speed smoothness at low-speed operation.

Error Compensation Technology of Semi-Strapdown MEMS Inertial Measurement System

2014 ◽  
Vol 609-610 ◽  
pp. 1213-1218 ◽  
Author(s):  
Jie Li ◽  
Jing De Zhu ◽  
Li Peng Hou ◽  
Jun Liu
Keyword(s):  
High Precision ◽  
Error Compensation ◽  
High Speed ◽  
Measurement Method ◽  
Motor Speed ◽  
High Precision Measurement ◽  
Inertial Measurement ◽  
Force Equation ◽  
Speed Fluctuation ◽  
Set Up

Semi-strapdown inertial measurement method provides a new solution for the high-precision measurement on flight attitude of high-spinning ammunition, while the specific set of components in the semi-strapdown application will cause a series of errors. This paper mainly analyzes the generation mechanism of motor speed fluctuation error and the misalignment error in coupling axis. Then the instantaneous motor speed measurement method based on the high-precision gyroscope is designed and the misalign model of coupling axis is set up, MEMS inertial measurement area centripetal force equation under the condition of high speed is worked out, and accuracy error parameters affecting the measurement are obtained. Finally, the paper provides corresponding error compensation method and comparative tests are conducted. The results show that the compensated system improves the accuracy of attitude angle calculating and the error has been effectively suppressed.

Uncontrolled Generation of Synchronous Traction Motors in EV/HEV/PHEV

2013 ◽  
Vol 446-447 ◽  
pp. 497-502
Author(s):  
Xiao Feng Ding ◽  
Zhen Li
Keyword(s):  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Simple Analytical Model ◽  
Motor Speed ◽  
Traction Motors ◽  
Battery Capacity ◽  
Interior Permanent Magnet ◽  
Drive Signals ◽  
The Impact

Interior permanent magnet synchronous motor (IPMSM) systems are vulnerable to uncontrolled generation (UCG) when the inverter switches loss their drive signals suddenly during flied weakening high speed operation. At this point, uncontrolled rectifier is composed by freewheel diodes in the inverter, the current comes from the motor through the rectifier, and then charges the battery. This paper develops a simple analytical model of this system firstly, and then carries out the simulation of UCG transient process to investigate the impact of the motor speed, battery capacity and other factors on UCG and feedback-power obtained throughout the process. Moreover, circuit improvement is presented in order to avoid destruction risk of the battery, motor, inverter and other relevant components during UCG.

scholarly journals Research on low-speed characteristics of differential double-drive feed system

2021 ◽  
Vol 12 (2) ◽  
pp. 791-802
Author(s):  
Zhaoguo Wang ◽  
Xianying Feng ◽  
Hongtao Yang ◽  
Huawei Jin
Keyword(s):  
Dynamic Models ◽  
Simulation Models ◽  
Ball Screw ◽  
Feed System ◽  
Low Speed ◽  
System A ◽  
Friction Models ◽  
Lugre Friction ◽  
Control Methodology ◽  
System Operating

Abstract. It is difficult to achieve high-precision control due to frictional nonlinearity by traditional linear control methodology for the classical drive feed system at low speed. Here, the double-drive differential feed system is proposed to reduce the influence of the nonlinear friction at the ball screw pair of a linear feed system operating at low speed. The dynamic models and the LuGre friction models of the classical drive feed system and the double-drive differential feed system are established, respectively. Based on these, the simulation models of the classical drive feed system and the double-drive differential feed system are established in MATLAB to study the critical creeping velocity of the table. Compared with the classical drive feed system, a lower stable velocity can be obtained for the table with the double-drive differential feed system, because the speed of both motors in the double-drive differential feed system is higher than the critical creeping speed of the classical drive feed system screw motor, thereby overcoming the influence of the Stribeck effect and avoiding the frictional nonlinearity at low speed.

Dynamic characteristics analysis and experimental of differential dual drive servo feed system

2021 ◽  
pp. 095440622110179
Author(s):  
Hanwen Yu ◽  
Laigang Zhang ◽  
Chong Wang ◽  
Xianying Feng
Keyword(s):  
Degrees Of Freedom ◽  
Electromechanical Coupling ◽  
Simulation Analysis ◽  
Drive System ◽  
Ball Screw ◽  
Parameter Method ◽  
Feed Speed ◽  
Feed System ◽  
Stick Slip ◽  
Low Speed

This paper presents the design for a new differential-dual-drive low-speed micro-feed mechanism. The ‘nut rotary ball screw pair’ is the main driving component of the mechanism. The screw and nut are each driven by a servo motor and these motors rotate in the same direction at a similar speed. The nonlinear factors such as friction and backlash can lead to unstable behaviours such as stick-slip and oscillation of the feed system. We use the Euler–Bernoulli beam elements, which have axial and torsional degrees of freedom, to describe the axial and torsional vibration of the ball screw, and use the spring-lumped parameter method to analyse other components of the feed system. An electromechanical coupling dynamic model with nonlinear factors of friction and clearance is established. Through simulation analysis and experiment, the difference in response of single-drive and differential-dual-drive systems under the influence of friction and clearance is studied. The results show that the nonlinear factors of friction and clearance have an influence on the feed speed of single-drive and differential-dual-drive system, but the low-speed micro-feed performance of the differential-dual-drive system is evidently better than that of the single-drive system. In the experiment, under the condition of screw single drive and differential dual drive, the critical crawling velocities of the table are measured. The experimental results are consistent with the simulation results, which verifies that the established models are reasonable. This lays a foundation for the design and research of the controller.

scholarly journals A Review on Disturbance Analysis and Suppression for Permanent Magnet Linear Synchronous Motor

Actuators ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 77
Author(s):  
Xuezhen Wang ◽  
Feixue Chen ◽  
RenFeng Zhu ◽  
Xiaolu Huang ◽  
Na Sang ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Thermal Effects ◽  
High Speed ◽  
Synchronous Motor ◽  
Ball Screw ◽  
Mitigation Measures ◽  
Feed System ◽  
Residual Vibration ◽  
Linear Synchronous Motor ◽  
Disturbance Analysis

In high-end testing and manufacturing equipment, a trend exists whereby the traditional servo feed system with a ball screw and rotary motor will gradually be replaced by a direct drive system. The precision motion system driven by a permanent magnet linear synchronous motor (PMLSM) offers several advantages, including high speed, high acceleration, and high positioning accuracy. However, the operating precision of the feed device will be affected by the PMLSM robustness to nonlinear and uncertain disturbances, such as cogging force, friction, thermal effects, residual vibration, and load disturbance. The aim of this paper was to provide a survey on disturbance analysis and suppression approaches to improve the dynamic performance of PMLSM motion systems. First, the origin and inhibition methods of thrust ripple and friction are presented. Second, the mechanisms, modeling approaches, and mitigation measures of thermal effects are introduced. Additionally, the residual vibration characteristics and suppression methods are discussed. Finally, disturbance observers of periodic and aperiodic loads are introduced. These suppression methods from structural design and control compensation are then discussed in order to improve the dynamic response and steady-state accuracy of PMLSM.

A Drive-Transmission Integrated Linear Electromechanical Actuator

2010 ◽  
Vol 37-38 ◽  
pp. 5-8 ◽  
Author(s):  
Wen Jia Chen ◽  
Jiang Zhang ◽  
Yan Zhong He
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Integrated Design ◽  
Servo System ◽  
Synchronous Motor ◽  
Ball Screw ◽  
Electromechanical Actuator ◽  
Position Feedback

Based on the idea of integrated design, a drive-transmission integrated linear electromechanical actuator is developed. The actuator consists of a permanent magnet synchronous motor (PMSM), a ball-screw and shells. By using coaxial assemblage, the ball-screw is inserted into the hole of the hollow motor rotor and the nut of the ball-screw connects with the motor rotor. In order to restrict the ball-screw rotating relatively to the shell, splines machined respectively on ball-screw and the shell come into being a spline pair. A driver based on a DSP processor and IGBTs plus a position feedback resolver forms a precise servo system.

scholarly journals Four-Level Hysteresis-Based DTC for Torque Capability Improvement of IPMSM Fed by Three-Level NPC Inverter

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1558 ◽  
Author(s):  
Samer Saleh Hakami ◽  
Kyo-Beum Lee
Keyword(s):  
High Speed ◽  
Control Strategies ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Simple Algorithm ◽  
Torque Control ◽  
Motor Speed ◽  
Average Value ◽  
Stator Current ◽  
Interior Permanent Magnet

Direct torque control (DTC) is considered one of the simplest and fastest control strategies used in motor drives. However, it produces large torque and flux ripples. Replacing the conventional two-level hysteresis torque controller (HTC) with a four-level HTC for a three-level neutral-point clamped (NPC) inverter can reduce the torque and flux ripples in interior permanent magnet synchronous motor (IPMSM) drives. However, the torque will not be controlled properly within the upper HTC bands when driving the IPMSM in the medium and high-speed regions. This problem causes the stator current to drop, resulting in poor torque control. To resolve this problem, a simple algorithm based on a torque error average calculation is proposed. Firstly, the proposed algorithm reads the information of the calculated torque and the corresponding torque reference to calculate the torque error. Secondly, the average value of torque error is calculated instantaneously as the reference torque changes. Finally, the average value of the torque error is used to indicate the operation of the proposed algorithm without the need for motor speed information. By using the proposed algorithm, the torque can be controlled well in all speed regions, and thus, a better stator current waveform can be obtained. Simulation and experimental results validate the effectiveness of the proposed method.

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