This research presents a finite-element analysis of the electromechanical field of a BLDC motor considering speed control and mechanical flexibility. The magnetic field is analyzed by the nonlinear time-stepping finite-element method considering the switching action of the pulse width modulation (PWM) inverter. Magnetic force and torque are calculated by the Maxwell stress tensor. Mechanical motion of a rotor is determined by a time-stepping finite-element method considering the flexibility of shaft, rotor, and bearing. Both magnetic and mechanical finite-element equations are combined in the closed loop to control the speed using PWM. Simulation results are verified by the experiments, and they are in good agreement with the experimental results.

Finite-element analysis of an electromechanical field of a BLDC motor considering speed control and mechanical flexibility

The authors propose a suppression control method for torque vibration of brushless DC motors utilizing feedforward compensation control and a generation method of compensation signals for the feedforward control by the repetitive control system with the Fourier transform utilizing a vibration signal acquired by an acceleration sensor attached to the motor frame, and in order to realize online generation of the feedforward compensation signals to reduce the vibration. An auto-tuning method of the repetitive control parameters is also presented. In this paper, an experimental system to detect and reduce the motor torque vibration is constructed, and the effectiveness of the proposed method is confirmed by experimental results.

Suppression control method for torque vibration of brushless DC motor utilizing repetitive control with Fourier transform

This paper deals with the characteristic analysis of a brushless dc motor (BLDC) taking into consideration the freewheeling diodes and dc link voltage ripple using a time-stepped voltage source finite-element method. By comparing the experimental results, the authors show that the proposed computational method is useful for the analysis and design of a BLDC motor. They also examine the influence of freewheeling diodes and dc link voltage ripples on the performance of a BLDC motor such as torque ripples and radial force on the surface of the teeth.

Finite-element analysis of brushless DC motor considering freewheeling diodes and DC link voltage ripple

A rotary pump having thrust bearings includes a system for equalizing the loading on the thrust bearings. The thrust bearings are each supported on pistons that are in fluid communication with a hydraulic circuit. The hydraulic circuit has substantially the same pressure throughout, thereby floating each piston at the same pressure to provide an equal support force to each thrust bearing via each piston.

Electrical submersible pump with equally loaded thrust bearings

Comparatıve analysis of the magnet effects on the permanent magnet BLDC motor performance used in electric vehicles

In this paper, we propose an analytical method for a motor with skewed magnets.In our proposal method, a motor is divided into the some segments, and then the sum of the induced voltage of each segments are coupled with the circuit equation, so that it becomes possible for 2-D FEM to take skewed effects into account.The proposed method has been applied to the analysis of DC Blushless Motor. Calculated results of induced voltage waveforms on no-load show close agreement with measured values. In addition the results of winding current waveformes and average torque vs. speed characteristics in steady state indicate good results. These results confirmed the validity of this method.

Magnetic Field Analysis of DC Blushless Motor with Skewed Magnet by 2-D FEM

Magnetic Field Analysis of DC Brushless Motor considered Volt-Ampere Characteristic of Feedback Diodes

PROBLEM TO BE SOLVED: To improve reliability of an underwater pump for a deep well which maintains sealability of a switched reluctance motor of a problem in use of the switched reluctance motor in the pump for the well. SOLUTION: The underwater pump for the deep well includes a motor 12 having the switched reluctance motor 12a which maintains sealability and a rotor 20 of which is coupled to a spindle 14, a pump 30 having an impeller 42 having a plurality of blades 42a disposed spirally at a rotary shaft 38 to pressurize water perpendicularly to the shaft 38, and a shaft joint 56 for coupling the spindle 14 of the motor 12 to the shaft 38 of the pump 30. COPYRIGHT: (C)2004,JPO

Underwater pump for deep well

In this paper we propose an analytical method of DCBLM with polar anisotropic plastic rotor magnets. The orientation of the polar anisotropic plastic magnet is different for each part.



In our method, the magnetic flux distribution of the injection mold for polar anisotropic plastic magnets is analyzed by FEM first. Next, the orientation is determined from the magnetic flux distribution. Finally, based on the latter, the nonlinear dynamic magnetic field of DCBLM is analyzed. The analytical value was in good agreement with the experimental value of magnetic flux distribution in the magnet unit and the characteristic of DCBLM. © 1999 Scripta Technica, Electr Eng Jpn, 127(3): 53–61, 1999

https://www.jstage.jst.go.jp/article/ieejias1987/117/8/117_8_1001/_pdf

Magnetic Field Analysis of Polar Anisotropic Plastic Magnet and Application for DC Brushless Motor

This paper presents a method to analyze magnetic field with accuracy by 2DFEM in shaded-pole type induction motor. That is to say, the equations of electric circuits which consist of the rotor bars are coupled with Maxwell's field equations directly to solve the currents in the rotor bars regardless of ‘grad φ’. And in the same way, all other secondary currents are solved with accuracy. Then the motor torque can be calculated by using the currents and the variations of the interlinkaged flux in the rotor bars.When the calculated results by this method are compared with the measured results, the good agreement is obtained.

Magnetic Field Analysis Using All Unkown Secondary Current Quantities in Shaded-Pole Type Induction Motor

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