Linear Pulse Motor Research Articles

THE INFLUENCE OF FRICTION FORCES ON LONGITUDINAL WAVE PROPAGATION IN A STUCK DRILL STRING IN A BOREHOLE

A mathematical model and the computer software for the analysis of dynamic processes occurring in the drilling pipes in the borehole under stuck drill string release by means of an impact mechanism (a jerking device) or a pulse-wave installation, equipped with electric linear pulse motor are presented. The drill string with an impact mechanism, which is inserted over the stuck section after failure, is detected and is activated by lowering and taking the non-stuck upper part of the string by means of the drilling rig drive and is considered as a discrete-continuous mechanical system. As a result of the impact of the hammer on the body of the impact mechanism, wave processes are formed in the drill string, which helps to release the stuck drill string. The influence of friction forces on propagation of longitudinal waves in the drill pipe string is investigated. Practical recommendations are developed regarding the above-mentioned efficiency of drilling for oil and gas.

Operator‐based robust non‐linear vibration control for an L‐shaped arm with unknown load by using on‐line wavelet transform

An L-shaped arm with unknown load driven by a linear pulse motor is studied in this work. To control the motor motion and the arm vibration, an operator-based non-linear control is designed using an on-line discrete wavelet transform (DWT). First, the dynamics of the L-shaped arm vibration is modelled by considering the arm as a two-dimensional Euler–Bernoulli beam. The relationship between the load and the arm vibration is given. Second, by using the on-line DWT in the operator-based non-linear control, the proposed control for the system is designed. The wavelet transform is used to estimate the load and remove the influence of some undesired uncertainties. The operator-based right coprime factorisation method is used to guarantee the robust stability of the motor-arm system. The piezoelectric actuator is utilised to further reduce the arm vibration. The hysteresis of the piezoelectric actuator is compensated by using a Prandtl–Ishlinskii hysteresis model. Finally, simulation results are demonstrated to validate the proposed control.

Experimental Study on Robust Nonlinear Forced Vibration Control for an L-Shaped Arm with Reduced Control Inputs

This paper presents an operator-based robust nonlinear control approach for an L-shaped arm vibration experimental system. The arm is driven by a linear pulse motor to move along a frame and controlled by a piezoelectric actuator in parallel. The aim of this paper is to allow the motor to move fast and reduce the arm vibration by controlling the motion of the motor and the piezoelectric actuator simultaneously. In detail, first, the vibration dynamics of the L-shaped arm is modeled based on the Euler–Bernoulli beam theory. The hysteresis of the piezoelectric actuator is modeled using a Prandtl–Ishlinskii hysteresis model. Second, by using operator-based robust right coprime factorization approach, the proposed control for the system is designed where the linear motor is optimally controlled to reduce the time consumption and the vibration at the vertical part of the arm. Meanwhile, with the hysteresis compensation, the piezoelectric actuator is used to further reduce the vibration at the horizontal part of the arm. Finally, the results of the experiment are demonstrated to verify the effectiveness of the proposed control scheme.

Operator-based robust nonlinear optimal vibration control for an L-shaped arm driven by linear pulse motor

An L-shaped arm driven by a linear pulse motor is considered in this paper, an operator-based robust nonlinear control approach is proposed to reduce the vibration of the arm. First, by separating the arm into two parts, its vibration dynamics is modelled based on Euler-Bernoulli beam theory. Second, by using operator-based robust right coprime factorization approach, two control schemes are designed, one for controlling the linear pulse motor move to the desired destination and reducing the vibration of the arm with optimal trajectory, another one is to control vibration of the arm by using a piezoelectric actuator, where a tracking compensator is designed to compensate the hysteresis of the piezoelectric actuator and make the arm vibration track to the reference values. Finally, simulation results are demonstrated to verify the effectiveness of the proposed control scheme.

Study on the FEA model of the linear pulse motor for railway application and reduction of thrust ripple

Study on the FEA model of the linear pulse motor for railway application and reduction of thrust ripple

리니어 펄스모터의 고정자 상권선 적층에 따른 추력 리플 저감 기법 연구

The stator phase winding of a linear pulse motor, which is a new type of linear motor, is comprised of two phases and is structurally characterized by a stacking method in which the winding of one phase is laid on top of the winding of another phase. Such a structural characteristic induces a difference in the flux linkage resulting from the flux of each stator phase winding in the same condition. The difference in the induced flux linkage acts as a kind of thrust ripple component in terms of the generated thrust. Thus, in order to maintain consistent thrust force, a method is required to solve the problem caused by the structural singularity. Hence, in this study, we present a technique for reducing the thrust force ripple generated by the stacking of the stator phase windings of a linear pulse motor through the generation of a compensating current reference value of the current controller in order to keep the torque constant. The proposed compensating algorithm is validated by simulations and experimental results.

Basic characteristics of new interior permanent magnet linear pulse motor

Basic characteristics of new interior permanent magnet linear pulse motor

Characteristics Analysis of Linear Pulse Motor Using 3-D Finite Element Method

In this paper, thrust characteristics of a linear pulse motor for the use of automatic doors driven by 2-phase excitation are computed using the 3-D finite element method. The effectiveness of this calculation is verified through the comparison with the measured results. The influences of the excitation control on the thrust characteristics are investigated. Furthermore, the influences of loads on dynamic performances are investigated.

Position-sensorless drive of linear pulse motor for suppressing transient vibration

The linear pulse motor (LPM) has been widely used because of its simple structure and easy control without the use of feedback. However, degradation of the response performance occurs, resulting from the transient vibration which is inherent in the LPM. The fastest way to suppress the vibration is to close the control loop using the position feedback sensor, However, the straightforward use of such a sensor feedback leads to higher cost and complicated configuration, sacrificing the structural advantage of the LPM. Therefore, the authors propose a Kalman filter-based sensorless control for suppressing the transient vibration. In this proposed control method, the LPM mover position and speed are optimally estimated using an extended Kalman filter applied to the nonlinear state equations of excitation winding circuits. The effectiveness of this method is confirmed by experiments on a prototype LPM control system using a digital signal processor.

Considerations of output voltage waveform on magnetic linear encoder for artificial heart using linear pulse motor

Sinusoidal output voltage waveforms have been considered on magnetic linear encoders which are used to detect a displacement of a mover on an artificial heart using a linear pulse motor. The magnetic linear encoder needs to be miniature, able to detect a small displacement and able to control speed. A new idea using the tooth of a mover has been developed to detect the displacement by using a small magneto-resistive element which is capable of high frequency response. Obtained results are as follows: (1) the magnetic linear encoder for the linear pulse motor was considered and clarified as a structure and a principle operation; (2) the sinusoidal output for the magnetic linear encoder was formatted with the output waveform of 29.9 mV and a distortion factor less than 10%; and (3) it was found that a bias gap of maximum output voltage was not dependent on the tooth pitch of the linear pulse motor mover when the detecting gap was fixed.

Position sensorless drive of linear pulse motor for suppressing transient vibration

The linear pulse motor (LPM) has been widely used because of its simple structure and ease of control without the use of feedback. However, the transient vibration inherent in the LPM results in degraded response performance. The fastest way to suppress the vibration is to close the control loop by means of a position feedback sensor. But the straightforward use of such a sensor feedback results in high cost and a complicated configuration and therefore sacrifices the structural advantages of the LPM. The authors therefore propose Kalman filter-based position sensor control as a means of suppressing transient vibration. In this proposed control method, the mover position and speed are optimally estimated by using an extended Kalman filter applied to the nonlinear state equation of the excitation winding circuits. The effectiveness of this control method is demonstrated by experiments on a prototype LPM system using a DSP. © 2000 Scripta Technica, Electr Eng Jpn, 134(1): 53–63, 2001

Wireless transmission of power and information and information for cableless linear motor drive

In previous papers, the authors introduced the wireless transmission of power and information (WTPI) for realizing a future manufacturing system which is free from the complexity of wiring for the power supply or control. In extension from these studies, the authors have attempted to apply the linear-type WTPI for realizing the maintenance-free drive and the multimover operation of a moving coil-type linear motor. This paper describes the basic concept of the WTPI and the analysis on the performance of the WTPI configured in the linear shape, thereafter introducing the preliminary test result on a prototype of the cableless linear pulse motor (CLLPM) which was constructed by integrating a linear pulse motor (LPM) with the associated driver and the linear WTPI for noncontact motion transfer.

Operation Condition for Linear Compressor using Linear Pulse Motor

Operation Condition for Linear Compressor using Linear Pulse Motor

Position Sensorless Drive of Linear Pulse Motor for Suppressing Transient Vibration

A linear pulse motor (LPM) has been widely used because of its simple structure and easy control without the use of feedback. However, there happens the degraded response performance resulting from the occurrence of transient vibration which is inherent to the LPM. The fastest way to suppress the vibration is to close the control loop using the position feedback sensor. But the straight-forward use of such a sensor feedback leads to the high cost and complicated configuration, sacrificing the structural advantage of the LPM. Therefore, the authors propose a Kalman Filter based position sensorless control for suppressing the transient vibration. In this proposed control method, the mover position and speed are optimally estimated using an extended Kalman Filter applied to the nonlinear state equation of excitation winding circuits. Effectiveness of this control method is clarified by the experiments on the prototype LPM system using a DSP.

Design investigation of a linear motor for artificial heart driving

The authors have been considering the use of a linear pulse motor (LPM) as a driving source of a totally implantable artificial heart (TAH), and have developed a series of artificial heart models that incorporate such a motor. The newly developed linear-type TAH (linear TAH) has two blood-pumps, which are inflated and deflated alternately by the LPM, causing a pusher plate to pulsate the blood. This paper deals with the performance calculation of the LPM using the loading ratio. Some motors manufactured for driving TAHs were then selected to compare their machine parameters. The selected motors were LPM, linear oscillatory actuator, brushless dc motors, and ultrasonic motor. Two parameters were selected for the comparison: the mechanical output/volume ratio and the motor constant. The results may be summarized as follows: 1. The LPM was designed based on the loading ratio, and the kinetic thrust and velocity were obtained at the range of 77 newtons and 80 mm/s, respectively. 2. The loading ratio of the LPMs were more than eight times larger in comparison with the rotary motors that were used in industrial machines. 3. The motor constants of the LPMs were recognized to be one figure larger than that of the brushless dc motors. In order to reduce the volume of the linear TAH, it is necessary to increase the drive velocity of the LPMs. Application of the linear motor to a nonpulsatile artificial heart will be one way to achieve this. © 1998 Scripta Technica, Electr Eng Jpn, 123(1): 43–50, 1998

Design Investigation of Linear Motor for Artificial Heart Driving.

The authors have been considering to use a linear pulse motor (LPM) as a driving source of a totally implantable artificial heart (TAH), and have developed a series of artificial heart models that incorporate such a motor. The newly developed linear-type TAH (linear TAH) has two blood pumps, which are inflated and deflated alternately by the LPM, causing a pusher plate to pulsate the blood.This paper deals with the performance calculation of the LPM using the loading ratio. Then some motors manufactured for driving TAHs were selected to compare their machine parameters. The selected motors were LPMs, linear oscillatory actuator, brushless dc motors, and ultrasonic motor. Two parameters were selected for the comparison: the mechanical output/volume ratio and the motor constant. The results may be summarized as follows:1. the LPM was designed based on the loading ratio, and the kinetic thrust and velocity were obtained at the range of 77 newtons, 80mm/s respectively;2. the loading ratio of the LPMs were more than eight times larger in comparison with the rotary motors which were used in industrial machines;3. the motor constants of the LPMs were recognized one figure larger than that of the bnrshless dc motors.In order to reduce the volume of the linear TAN, it is necessary to increase the drive velocity of the LPMs. Application of the linear motor to a nonpulsatile artificial heart will be one way to achieve this.

Performance Characteristics of an X-Y Linear Pulse Motor Using Air Bearing

This paper deals with the performance characteristics of a two-axis linear pulse motor (X-Y LPM) using air bearing. The mass, M, of the mover of X-Y LPM is 1.35 kg and the maximum static thrust, Fs, is 48.5 N with two-phase excitation at 2 A. The maximum velocity of the mover, v, is 1.4 m/s and the maximum acceleration, a, is 14.3 m/s2 at a velocity of 1 m/s without any load. The kinetic thrust, Fk, is 19.3 N. A non-oriented magnetic steel sheet, 50A350, is used as the core in the mover, and rolled steel for general structures, SS400, is used as the stator. The maximum flux densities, Bm, of 50A350 and SS400 are 1.45 T and 0.123 T, respectively, in a magnetic field with a maximum intensity of 1 kA/m and at a frequency of 1 kHz. The material of the stator must have a high magnetic flux density at the driving frequency to achieve high velocity and high-thrust driving of the X-Y LPM.

Analysis of the Losses of a Linear Pulse Motor for a Total Artificial Heart

Analysis of the Losses of a Linear Pulse Motor for a Total Artificial Heart

In vitro evaluation of linear motor-driven total artificial heart.

This paper deals with the in vitro evaluation of a newly developed linear motor-driven total artificial heart (linear TAH). The linear TAHs have been developed and evaluated in mock testing and acute animal experiments. The new linear TAH was made based on experience with acute animal experiments. The maximum static thrust of the new linear pulse motor is 146 N with exciting current of 1.69 A. The weight and the volume of this linear TAH are 1.9 kg and 560 ml, respectively. The linear TAH has a kinetic thrust of 85 to 43 N and provides the maximum flow rate of 6.8 L/min in mock circulatory testing.

完全人工心臓駆動用モータの特性値の比較

The authors have been considering the possibility of using a linear pulse motor (LPM) as a driving source, and have developed a series of artificial heart models that incorporate such a motor. The newly developed linear-type totally implantable artificial heart (linear TAH) has two blood pumps, which are inflated and deflated alternately by the LPM, causing a pusher plate to pulsate the blood. This paper compares the machine parameters of LPMs, brush- less dc motors, and ultrasonic motor for driving artificial hearts. We selected two parameters for the comparison: the mechanical output/volume ratio and the motor constant. The results may be summarized as follows: (1)the brushless dc motors had a mechanical output/volume ratio 3 to 5.5 times larger than that of the LPMs; (2) we considered that the motor constant of the LPM was within almost the same range as that of the brushless dc motors. It was established that in order to reduce the volume of the linear TAH, it is necessary to increase the drive velocity of the LPMs by using a special mechanism. We consider that application of the LPM to a nonpulsatile artificial heart is one way to achieve this.