A Lorentz Force Type Self-Bearing Motor with New 4-Pole Winding Configuration

Kim, Seung-Jong; Abé, Keisuke; Kanebako, Hideki; Okada, Yohji; Lee, Chong Won

doi:10.1299/jsmec.46.349

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Since the end of the 1980s, extensive research has been carried out, resulting in the development of various kinds of integrated motor-bearing systems [2]. The new integrated motor-bearing systems that have been proposed in recent years deserve much attention, as they employ the Lorentz force for rotor position regulation as well as motoring [3][4][5][6][7]. Unlike the Maxwell force, the bidirectionality and good linear properties of the Lorentz force can simplify the analysis and design of the system when it is applied to stabilize the rotor position.…”

Section: Introductionmentioning

confidence: 99%

Experimental Compensation of Runout and High Order Harmonic Effects in Lorentz Force Type Integrated Motor-Bearing System

Park

Lee

2005

Volume 1: 20th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C

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An integrated motor-bearing system integrates the functions of an active magnetic bearing and an electric motor into a single unit. Because this system requires the simultaneous generation of torque and radial control force, there will inevitably be undesired high order harmonic components in the rotating magnetic field, which will result in torque ripple and radial force distortion. Sensor target runout is a severe excitation source and, as such, causes a lot of vibration. In this paper, we propose an experimental compensation procedure for the oscillation and coupling of torque and radial force using a digital controller of the Lorentz force type integrated motor-bearing system in a dual disk rotor configuration. After the compensation of high order harmonics, the runout profile and rotor unbalance are identified by the extended influence coefficient method. The proposed scheme does not require complicated analysis or modeling of high order harmonic effects, and it can also compensate for manufacturing errors. The experimental results confirm that this compensation method effectively attenuates the rotor vibration throughout the operating range of rotational speeds.

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Section: Introductionmentioning

confidence: 99%

Experimental Compensation of Runout and High Order Harmonic Effects in Lorentz Force Type Integrated Motor-Bearing System

Park

Lee

2005

Volume 1: 20th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C

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“…Kim and Lee [8] proposed an eddy current model accounting for the arrangement of poles and the size of pitch, and developed the hybrid-type AMB that is able to reduce the eddy current loss. In recent years, a new concept system, called the integrated motor-bearing or self-bearing motor, which is a functional combination of motor and AMB, has been developed, using lamination cores and rotor [9][10][11][12]. Those integrated motor-bearings use the Lorentz force for levitation and motoring of rotor.…”

Section: Introductionmentioning

confidence: 99%

“…Han et al [9] developed a Lorentz-type integrated motor-bearing system with a disk-shape rotor. Okada et al [10][11][12] introduced another disk-type integrated motor-bearing system and a cylindrical one, using Lorentz force.…”

Section: Introductionmentioning

confidence: 99%

Design and Control of Active Magnetic Bearing System With Lorentz Force Type Axial Actuator

Kim

Lee

2003

Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C

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As the size of 5-axis active magnetic bearing (AMB) gets smaller, the space limitation for installation of axial magnetic bearing unit becomes stringent. In this paper, a new type of compact, high-performance 5-axis AMB with solid cores and rotor is proposed, which consists of four permanent magnets, four U-shaped cores and 16 control coils. The proposed homopolar AMB system is levitated by the Lorentz type axial as well as Maxwell type radial forces. Based on the magnetic flux distribution analysis, the control algorithm is designed to account for the coupled effect between the radial and axial control fluxes. Experiments are also carried out with a prototype AMB system to validate the new design concept.

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“…This idea was initially proposed by Okada et al (6) and it has led to several investigations on this type of self-bearing motor (7)(8)(9). This method exploited Lorentz relationship to produce both the levitating forces and motoring torque.…”

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confidence: 99%

Development of Lorentz Force‐Type Self‐bearing Motor for an Alternative Axial Flow Blood Pump Design

Lim

Zhang

2006

Artificial Organs

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A Lorentz force-type self-bearing motor was developed to provide delivery of both motoring torque and levitation force for an alternative axial flow blood pump design with an enclosed impeller. The axial flow pumps currently available introduce electromagnetic coupling from the motor's stator to the impeller by means of permanent magnets (PMs) embedded in the tips of the pump's blades. This design has distinct disadvantages, for example, pumping efficiency and electromagnetic coupling transmission are compromised by the constrained or poor geometry of the blades and limited pole width of the PMs, respectively. In this research, a Lorentz force-type self-bearing motor was developed. It is composed of (i) an eight-pole PM hollow-cylindrical rotor assembly supposedly to house and enclose the impeller of an axial flow blood pump, and (ii) a six-pole stator with two sets of copper wire and different winding configurations to provide the motoring torque and levitating force for the rotor assembly. MATLAB's xPC Target interface hardware was used as the rapid prototyping tool for the development of the controller for the self-bearing motor. Experimental results on a free/simply supported rotor assembly validated the design feasibility and control algorithm effectiveness in providing both the motoring torque and levitation force for the rotor. When levitated, a maximum orbital displacement of 0.3 mm corresponding to 1050 rpm of the rotor was measured by two eddy current probes placed in the orthogonal direction. This design has the advantage of eliminating the trade-off between motoring torques, levitating force, and pumping efficiency of previous studies. It also indicated the benefits of enclosed-impeller design as having good dynamic response, linearity, and better reliability. The nonmechanical contact feature between rotating and stationary parts will further reduce hemolysis and thromboembolitic tendencies in a typical blood pump application.

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A Lorentz Force Type Self-Bearing Motor with New 4-Pole Winding Configuration

Cited by 5 publications

References 2 publications

Experimental Compensation of Runout and High Order Harmonic Effects in Lorentz Force Type Integrated Motor-Bearing System

Experimental Compensation of Runout and High Order Harmonic Effects in Lorentz Force Type Integrated Motor-Bearing System

Design and Control of Active Magnetic Bearing System With Lorentz Force Type Axial Actuator

Development of Lorentz Force‐Type Self‐bearing Motor for an Alternative Axial Flow Blood Pump Design

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