International Journal of Applied Electromagnetics and Mechanics - Volume 15, issue 1-4

Authors: Wakiwaka, Hiroyuki | Misron, Norhisam | Kamiya, Akinori | Yajima, Hisashi | Tamura, Kazuya | Fujiwara, Nobuhiro | Hosono, Masayuki | Takada Takada, Susumu

Article Type: Research Article

Abstract: In recent years, linear motors are gaining wide popularity in the field of office and factory automation. Therefore, small and high thrust linear motors are needed. This paper deals with a proposal of a new interior permanent magnet type linear pulse motor and it's characteristics. The thrust density of the interior permanent magnet linear pulse motor is larger compared to the other type linear pulse motors.

DOI: 10.3233/JAE-2002-445

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 129-133, 2002

Authors: Fujii, Nobuo | Tanaka, Shinobu | Okinaga, Kinjiro

Article Type: Research Article

Abstract: As a two-dimensional movement motor, the double-sided X-Y linear synchronous motor without armature core has been proposed as a precise positioning device. The linkage flux density and thrust are studied analytically by using three-dimensional numerical analysis. The results show that this motor has sufficiently large values on them and the satisfied thrust per mass in the air core type for the double-sided pole configuration. There is little ripple in the thrust in the motion to any …position as there is no detent force. Show more

DOI: 10.3233/JAE-2002-443

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 135-142, 2002

Authors: Schofield, N. | Giraud-Audine, C. | Powell, D.J. | Howe, D.

Article Type: Research Article

Abstract: Permanent magnet brushless ac machines are ideally suited for traction applications, since they are energy efficient and have a high specific torque and a high peak to continuous torque capability. Further, they can be field-weakened to facilitate constant power operation over an extended speed range without compromising the VA rating of the drive. However, they must be design optimised with due regard to their duty cycle, their thermal management, the volt-ampere constraint of the drive and …any space envelope constraints. A design methodology which accommodates these aspects into the electromagnetic design synthesis process has been developed and employed to design a traction machine for a small urban vehicle. Show more

DOI: 10.3233/JAE-2002-452

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 143-148, 2002

Authors: Kluszczyński, Krzysztof

Article Type: Research Article

Abstract: It is explained why a polyphase (m > 3) induction motor supplied separately by single consecutive symmetrical components of voltage behaves as a multi-speed motor. As an example a 9-phase 4-speed motor is considered and results of computer simulations are presented. As regards the theory of polyphase machines it is shown that the so-called diagram of decomposition of polyphase induction motor into elementary machines (the graphical representation of a motor model in αβ …0 coordinates) is very convenient means for their analysis and modelling. Show more

DOI: 10.3233/JAE-2002-507

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 149-154, 2002

Authors: Rens, J. | Clark, R.E. | Howe, D.

Article Type: Research Article

Abstract: Reciprocating air-compressors inherently generate high vibrational forces, which are transmitted to supporting structures and may result in a high level of acoustic noise. In many applications, this cannot be tolerated, and, therefore, an effective means of controlling the transmitted vibration energy between a compressor and its surroundings must be employed. In this paper, an analysis of a typical reciprocating actuator is described, and an active method for suppressing the transmission of vibrations is proposed.

DOI: 10.3233/JAE-2002-448

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 155-162, 2002

Authors: Tsutomu, Mizuno | Takuya, Yaegashi | Masaki, Takai | Makoto, Utsuno | Hideo, Yamamoto | Kouyou, Shibuya | Hajime, Yamada

Article Type: Research Article

Abstract: This paper deals with the efficiency characteristics of a moving-magnet-type linear oscillatory actuator (LOA) for compressor by using a novel measuring method. In this measurement, another linear motor is used as the load instead of compressor. The relationship between efficiency and the phase of the load current is investegated. Maximum efficiency of the LOA reaches to 87% at the output power of 61 W.

DOI: 10.3233/JAE-2002-438

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 163-167, 2002

Authors: Fujii, Nobuo | Sakamoto, Yasuaki | Kayasuga, Takeshi

Article Type: Research Article

Abstract: The authors have proposed new compensation methods for a solution of the end effect of the linear induction motor (LIM), which is to supply the eddy current with minimum power loss in front of LIM. As one of proposed methods, the magnet rotator type compensator is discussed in the paper. The effect is studied analytically on the LIM parameters used in subways in Japan. The thrust density distribution of the LIM with the compensator clearly shows the …improvement in the front region. The thrust and the output kW per input kVA of the LIM at the slip of 0.1 increase by 58% and 45% respectively by using the compensator. Show more

DOI: 10.3233/JAE-2002-444

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 169-174, 2002

Authors: Kitazawa, Kanji | Kikuchi, Yoshimi | Mimura, Hisashi | Makiuchi, Hiromi | Kamiya, Akinori | Wakiwaka, Hiroyuki

Article Type: Research Article

Abstract: The VR type Resolver is an angle sensor for the motor of electric vehicles and hybrid electric vehicles. The static angle accuracy of the Resolver affects the dynamic error during rotation of the motor. Therefore, for the purpose of reducing the static error of the Resolver, the cause of error was investigated by means of experiment and FEM analysis, especially regarding the effect of leakage flux distribution around the coils. As a result, it became evident …that the flux distribution in stator slots is not equal, thus uniform winding and balance between 2-phase output coils are needed. Show more

DOI: 10.3233/JAE-2002-505

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 175-182, 2002

Authors: Jung, Sang-Yong | Jung, Hyun-Kyo

Article Type: Research Article

Abstract: Running characteristics of permanent magnet linear synchronous motor(PMLSM) which is usually used in the system requiring the high acceleration and the accurate position precision are investigated. Also, employment of partial excitation of primary current according to the mover position for the efficient motor drive, and its influence on the EMF and thrust force ripple are considered in detail. Furthermore, capability of PMLSM manifesting the speed-force feasibility under the running condition will be …followed. Show more

Keywords: Permanent magnet Linear Synchronous motor(PMLSM), Partial Excitation of primary current, capability, speed-force feasibility

DOI: 10.3233/JAE-2002-439

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 183-187, 2002

Authors: Hantila, F. | Vasiliu, M. | Preda, G. | Demeter, E.

Article Type: Research Article

Abstract: The paper presents a very useful method for computation of the sensitivities of electrical machines, taking into account the non-linearity of the ferromagnetic bodies. In the first step, the magnetic field in non-linear media and the performances of the given machine are calculated. The non-linear medium is replaced with a linear medium having a magnetic polarization that is iteratively corrected by the flux density. Each linear field problem is solved using the periodic Green function. In …the second step, the difference of the magnetic field due to the small modification is computed directly. The polarization of the eliminated ferromagnetic domain is the field source. The {\bf B-I} relation is given by Frechet first derivative. Show more

DOI: 10.3233/JAE-2002-451

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 15, no. 1-4, pp. 189-194, 2002