An Improved Control Method of Buried-Type IPM Bearingless Motors Considering Magnetic Saturation and Magnetic Pull Variation

Ooshima, M.; Chibá, Akira; Rahman, Mohammad Azizur; Fukao, T.

doi:10.1109/tec.2004.832065

Cited by 69 publications

(27 citation statements)

References 6 publications

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“…Under the same conditions (10) simplifies to a twice rotational-speed oscillation in the first term which is a negative sine wave which F y agrees with. (ii) When p = 3, according to (11) and (12), F x and F y should have an oscillation component which is three times the rotational speed, i.e., we should see an oscillation with ¾ of a cycle. However when comparing the coefficients in (11) we will see that 4πA p (A p being the magnet MMF) is likely to be much higher than A sx sin(3θ m /2) (the suspension current MMF in the along the x-axis) and in this case this appears to be so.…”

Section: Principle Of Suspension Force Generationmentioning

confidence: 99%

“…These machines are a BPM motor [11] and an inset type of motor [8]. In Table III, the maximum suspension force is divided by the rotor diameter D and stack length L. For the torque comparison, it is divided by D 2 and L. Remember that the suspension force is the vector integration of the radial stress around the airgap while the torque is the mean airgap radius multiplied by the integration of the tangential stress around the airgap.…”

Section: Comparison Of Motor Performancementioning

confidence: 99%

“…For the permanent magnet bearingless motor, a variety of types and topologies have been proposed, e.g., the surface mounted permanent magnet motor (SPM) [1]- [7], the inset permanent magnet motor [8], the buried permanent magnet motor (BPM) [9]- [11], the interior permanent magnet motor (IPM), the homopolar hybrid motor [12] [13], etc. However most of these permanent magnet bearingless motors need rotor angular position sensing for feedback to the magnetic suspension controller as well as radial position sensing.…”

Section: Introductionmentioning

confidence: 99%

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Basic characteristics of a consequent-pole-type bearingless motor

et al. 2005

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---In this paper, the basic characteristics of a consequent-pole bearingless motor are described. The consequent-pole type rotor has buried permanent magnets polarized in the same radial direction. An analysis is carried out to find the optimum pole number for the machine to produce stable magnetic suspension. The results indicate that there is decoupling of the radial suspension forces from the drive torque when eight or more poles are used. A comparison is given for the torque and suspension force generation with respect to a conventional surface-mount PM rotor. It is shown that the suspension force is several times higher for the consequent-pole rotor; however the torque decreases by 12%. A test machine was built and the torque and suspension characteristics were confirmed. Comparison is also made with other conventional bearingless motors.

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Section: Principle Of Suspension Force Generationmentioning

confidence: 99%

Section: Comparison Of Motor Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Basic characteristics of a consequent-pole-type bearingless motor

et al. 2005

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“…The main advantage here is that the torque and levitation force can be controlled independently. According to the location of the permanent magnet on the rotor, the PM type bearingless motor can be classified into several types, including surface permanent magnet type [16,17], inset permanent magnet type [18], interior permanent magnet type [19], consequent-pole type [20], and toothless type [21,22]. In general, if the thickness of the permanent magnet is larger, larger torque can be produced, although the radial suspension force will become smaller.…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study of a Bearingless Motor Based on Three-pole Active Magnetic Bearing

Chen

Hsu

Wang

et al. 2012

AUSMT

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Abstract:The active magnetic bearing (AMB) offers several advantages such as having no friction, high rotational speed, less energy loss, and long life span. In rotation application, however, it must be connected to a motor which may degrade its performance. A bearingless motor is the combination of the active magnetic bearing and a motor. It saves software and hardware facilities, resulting in lower costs. In this paper, a permanent-magnet type bearingless motor is proposed based on a three-pole AMB. The translational magnetic field (generating the bearing forces) and the rotational magnetic field (generating the motor torque) are analyzed to establish the mathematical dynamic model of the overall system. Based on the dynamic model, a two-stage controller that sequentially levitates the rotor and controls the motor speed is designed. Numerical simulations are performed to verify the analysis.

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“…These characteristics are very favourable for high performance applications, e.g., robotics, aerospace, and electric ship propulsion systems Rahman et al (1996), Ooshima et al (2004). PMSMs as traction motors are common in electric or hybrid road vehicles, but not yet widely used for rail vehicles.…”

Section: Introductionmentioning

confidence: 99%

A Robust Decoupling Estimator to Identify Electrical Parameters for Three-Phase Permanent Magnet Synchronous Motors

Mercorelli¹

2011

Recent Advances in Robust Control - Theory and Applications in Robotics and Electromechanics

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IntroductionAs the high field strength neodymium-iron-boron (NdFeB) magnets become commercially available and affordable, the sinusoidal back electromagnetic force (emf) permanent magnet synchronous motors (PMSMs) are receiving increasing attention due to their high speed, high power density and high efficiency. These characteristics are very favourable for high performance applications, e.g., robotics, aerospace, and electric ship propulsion systems Rahman et al. (1996), Ooshima et al. (2004). PMSMs as traction motors are common in electric or hybrid road vehicles, but not yet widely used for rail vehicles. Although the traction PMSM has many advantages, just a few prototypes of vehicles were built and tested. The following two new prototypes of rail vehicles with traction PMSMs, which were presented at the InnoTrans fair in Berlin 2008, were the Alstom AGV high speed train and the Skoda Transportation low floor tram 15T ForCity. The greatest advantage of the PMSM is its low volume in contrast to other types of motors, which makes a direct drive of wheels possible. However, the traction drive with PMSM must meet special requirements typical for overhead-line-fed vehicles. The drives and especially their control should be robust to a wide range of overhead line voltage tolerance (typically from −30% to +20% ), voltage surges and input filter oscillations. These features may cause problems during flux weakening operation, which must be used for several reasons. The typical reason is to obtain constant power operation in a wide speed range and to reach nominal power during low speed (commonly 1/3 of the maximum speed). In the case of common traction motors such as asynchronous or DC motors, it is possible to reach the constant power region using flux weakening. This is also possible for traction PMSM, however, a problem with high back emf arises. In the report by Dolecek (2009), the usage of a flux weakening control strategy for PMSM as a prediction control structure is shown to improve the dynamic performance of traditional feedback control strategies. This is obtained in terms, for instance, of overshoot and rising time. It is known that, an accurate knowledge of the model and its parameters is necessary for realizing an effective prediction control. To achieve desired system performance, advanced control systems are usually required to provide fast and accurate response, quick disturbance recovery and parameter variations insensitivity Rahman et al. (2003). Acquiring accurate models for systems under investigation is usually the fundamental part in advanced control system designs. Will-be-set-by-IN-TECH common parameters required for the implementation of such advanced control algorithms are the classical simplified model parameters: L d -the direct axis self-inductance, L q -t h e quadrature axis self-inductance, and Φ -the permanent magnet flux linkage. Prior knowledge of the previously mentioned parameters and the number of pole pairs p allows for the implementation of torque control through the use of curr...

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An Improved Control Method of Buried-Type IPM Bearingless Motors Considering Magnetic Saturation and Magnetic Pull Variation

Cited by 69 publications

References 6 publications

Basic characteristics of a consequent-pole-type bearingless motor

Basic characteristics of a consequent-pole-type bearingless motor

A Feasibility Study of a Bearingless Motor Based on Three-pole Active Magnetic Bearing

A Robust Decoupling Estimator to Identify Electrical Parameters for Three-Phase Permanent Magnet Synchronous Motors

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