Indirect magnetic suspension by an actively controlled permanent magnet

Yamamoto, Akihiro; Kimura, Masayuki; Hikihara, Takashi

doi:10.1587/nolta.4.284

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…To obtain sufficient attractive force, permanent magnetic (pre-magnetized) floators are used instead of ferromagnetic floators as shown by Fig.3. Yamamoto et al has proposed indirect suspension, which corresponds to 2-series magnetic suspension, and achieved stable noncontact suspension (4) .…”

Section: Basic Conceptmentioning

confidence: 99%

Multiple Magnetic Suspension Systems

Mizuno

Takasaki

Ishino

2013

JSDD

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The paper proposes multiple magnetic suspension systems. The concepts are presented by using their basic models. They are classified according to multiple structure, power amplifier and coil connection. According to the first item, they can be divided into series and parallel. This paper mainly treats the latter. The controllability and the observability of each parallel suspension system are discussed based on its mathematical model. The concept of self-sensing magnetic suspension is stretched to the multiple systems. The feasibility of parallel magnetic suspension is demonstrated by simulation

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Section: Basic Conceptmentioning

confidence: 99%

Multiple Magnetic Suspension Systems

Mizuno

Takasaki

Ishino

2013

JSDD

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“…磁気浮上機構は，磁気力を用いて浮上体を非接触で支持する機構である．機械的な接触による摩擦がないこと，塵埃などを発生しないことなどの利点があり，種々の磁気浮上機構が提案されている．多くの磁気浮上装置 (1) や磁気軸受 (2) には，電磁コイルを用いた電磁石が使われている．一方，永久磁石を用いた種々の磁気浮上も提案されている．例えば，リニアアクチュエータを用いて永久磁石と強磁性体との間に動く吸引力を制御する方式 (3) (4) や，永久磁石の反発力を用いた方式 (5) ，永久磁石を浮上装置の磁路中に挿入して磁歪素子と圧電材料を用いて磁路を制御する方式 (6) ，磁路中に挿入した強磁性体の位置を変化させることによって，浮上力を調整する方式 (7) ，円盤形磁石を回転モータにより駆動し浮上力を制御する方式 (8) などである．これらの永久磁石を用いた浮上機構は，電磁コイルと違い起磁力発生に発熱の問題がなく，またコイル体積を少なくできる可能性がある．また，円盤磁石を用いた浮上機構は，浮上力をほぼ零にできるため，浮上体が永久磁石に吸着したときにも復帰が可能であるという特長を持つ．磁気浮上機構において，近年多重磁気浮上システムが提案されるようになってきた．通常磁気軸受などでは，磁石の吸引力を制御するために浮上体の運動の自由度ごとに最低１つの電流源または電圧源を用いている．これらの多重式磁気浮上機構を用いることにより，浮上体の複数の自由度を１つの電流(電圧)源で駆動させることが可能となり，磁気浮上機構の低コスト化を図ることが期待できる．永久磁石を用いたシステム (3) によるものとして，永久磁石の運動制御を用いて鉛直方向に複数の鉄球を浮上させるシステムの検討が行なわされている (9) ．しかし，これは多自由度の浮上の実現の可能性を示した提案のものである．また電磁石を用いた多重磁気浮上システムでは，支持用電磁石の生成する磁場によって，永久磁石と鉄球を直列に浮上させることや (10) ，直列に接続された二つの電磁コイルと一つのアンプを用いた多自由度浮上システムが提案されている (11) Rotation Angle of Magnet (Degree)…”

Section: 緒言unclassified

Magnetic Suspension Using Variable Flux Path Control Mechanism with Permanent Magnet (Simultaneous Suspension Experiment of Two Iron Balls)

Sun¹,

Oka

2012

Trans.JSME(C)

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This paper proposes a simultaneous suspension of two iron balls using a variable flux path control mechanism.This mechanism consists of a disk-type permanent magnet, a rotary actuator, and two iron cores. In this mechanism, the two iron balls are suspended in parallel. The suspension forces for two iron balls are generated on the ends of two iron cores, and controlled by varying the angle of the disk magnet that is driven by a rotary actuator. In this paper, first, the control principle of suspension force is explained, and the experimental prototype and the controller are introduced.Second, basing on experimental data, a numerical model is setup, and the controllability is proved. Finally, the feedback gains are calculated by LQR (Linear Quadratic Regulator), and the simultaneous suspension experiment of two iron balls is succeeded with the linear rails. All results indicate that the two iron balls can be suspended simultaneously.

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“…Currently, digital control systems are used in several technological and academic fields. Nowadays, there is a lot of research studies related to these systems, and they are oriented to developing more and better control systems [26,20,27,14]. Some of these control strategies have been developed with high-complexity techniques.…”

Section: Introductionmentioning

confidence: 99%

Digital proportional‐derivative controller implemented in low‐resource microcontrollers

Jiménez-Ramírez

Cardenas-Valderrama

Ordonez-Sanchez

et al. 2020

Comp Applic In Engineering

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The use of software and microcontrollers helps engineering students to gain a better understanding of the different concepts and algorithms of digital control theory, which they can apply in their professional work in industrial environments. Typically, these digital control concepts and algorithms are implemented in high-resources microcontrollers; nevertheless, we show that they can also be implemented in low-resource devices, helping students to acquire fundamental knowledge and develop long-term skills to solve real problems from the learning they achieve in their undergraduate educational programs in control or computer engineering. For this purpose, we provide an algorithm to synthesize a digital proportional-derivative controller oriented to low-resource microcontrollers (microcontrollers without floating-point unit). This algorithm allows implementing solutions for classic controllers in low-resource microcontrollers applied to academic and technological fields. This algorithm reduces the excessive amount of execution time in a low-resource microcontroller, it works with integer numbers and it is designed to implement fast classical controllers, which typically are performed with floating-point operations. Furthermore, we present a brief description of the implemented electronic circuit, serving as a guide for students to develop their own circuits. The experimental results show that the proposed algorithm can be successfully applied to an electromagnetic levitation system, which is commonly used in the academic training of electronics and control engineers, mainly due to its unstable nature. In this case, although the levitation system has a small time constant, the proposed algorithm appropriately leads the system to a stable regime.

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Indirect magnetic suspension by an actively controlled permanent magnet

Cited by 4 publications

References 12 publications

Multiple Magnetic Suspension Systems

Multiple Magnetic Suspension Systems

Magnetic Suspension Using Variable Flux Path Control Mechanism with Permanent Magnet (Simultaneous Suspension Experiment of Two Iron Balls)

Digital proportional‐derivative controller implemented in low‐resource microcontrollers

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