Effects of samarium cobalt permanent magnet on the performance of polyphase hysteresis-reluctance motors

Rahman, M.A.; Osheiba, A. M.; Little, T.; Slemon, G.R.

doi:10.1109/tmag.1984.1063477

Cited by 10 publications

(7 citation statements)

References 5 publications

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“…Selecting a suitable rotor material for the hysteresis motor is the most important issue in the designing process. Performances of only few materials used in the rotors of hysteresis motors have already been investigated [20][21][22][23]. The rotor of the prototype fabricated motors is made of special alloy steel with composition Fe-Cr-Ni-Mo-C and a particular heat treatment.…”

Section: Performance Calculationmentioning

confidence: 99%

Comparison between coreless and slotless kinds of dual rotor discs hysteresis motors

Ghanbari

Moghadam

Darabi

2016

IET Electric Power Applications

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Hysteresis motors have some distinct advantages such as constant speed and torque, noiseless operation, robust structure, and low-starting current in comparison with other synchronous motors. The main general defects of the hysteresis machines are low efficiency and relatively low-torque density. In this study, two previously proposed structures for the hysteresis motors named 'coreless dual rotor discs hysteresis motor' and 'slotless dual rotor discs hysteresis motor' are compared with each other and with other conventional hysteresis motors from different aspects. Rectifying the iron loss in the coreless type, especially in high-speed applications, and rotor parasitic loss in the slotless type are the most important advantages of these structures. Relative ease of manufacturing process, low production cost, and extendable torque (by multi stack structure) are other significant advantages of these motors. On the basis of two derived optimal designs for the motors, the performances of the motors are compared in different supply voltages.

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Section: Performance Calculationmentioning

confidence: 99%

Comparison between coreless and slotless kinds of dual rotor discs hysteresis motors

Ghanbari

Moghadam

Darabi

2016

IET Electric Power Applications

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“…Perov showed that the use of permanent magnets in the rotor of hysteresis motor eliminates many of its shortcomings including low power factor, low efficiency and oscillations around synchronous speed. In 1984, Rahman et al investigated the effect of adding Samarium-Cobalt permanent magnets to a cylindrical hysteresis motor [3]. They also showed that the use of this magnet would yield a greater airgap excitation voltage than the other magnets like Alnico 5, and eventually would improve the machine performance.…”

Section: Introductionmentioning

confidence: 99%

“…In 1991, Rahman built and patented the cylindrical permanent magnet hysteresis motor through adding a permanent magnet to the hysteresis ring [6]. This structure has the same characteristics as the structure of [3]. The PMHS motor with the same structure introduced in [6] was then investigated in 1996 and its behavior was predicted using the state variables of the motor in the time domain [7].…”

Section: Introductionmentioning

confidence: 99%

A new design algorithm for the PMHS motor considering the combination ratio

Behniafar¹,

Darabi²

2021

Turkish Journal of Electrical Engineering and Computer Sciences

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Recently, the hysteresis motors have a special significance in the nuclear industries. This is because these motors have some advantages such as low noise, high mechanical strength and group feeding ability. They also have some disadvantages that make some limitations for related industries. These disadvantages include low synchronization torque, low power factor, low efficiency, and hunting. One solution to reduce these disadvantages is to combine the hysteresis motor with the PM motor. This however requires a correct and flexible design procedure as well as an appropriate choice of the machine structure. Accordingly, this paper aims to present a new design algorithm for a disc-type permanent magnet hysteresis synchronous (PMHS) hybrid motor. The proposed design algorithm not only tries to retain the positive features of the both motors in the resulted hybrid motor, but it also gives the user the option of determining the percentage of the combination of the two motors. In other words, the user can determine the contribution of each motor to the output power of the resulted motor. The proposed algorithm is finally validated through fabricating a prototype disc-type PMHS motor and evaluating its performance by simulation and experiment.

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“…He also indicated that the use of permanent magnets in the rotor of a hysteresis motor leads to removing many weaknesses of this motor such as low power factor, low efficiency, and hunting. In [2], the effect of a samarium cobalt permanent magnet on the steady-state performance of a cylindrical hysteresis reluctance motor was studied. It was demonstrated that the use of this magnet compared to other magnets like Alnico5 increases the exciting air-gap voltage and thus can improve the machine performance.…”

Section: Introductionmentioning

confidence: 99%

A new semianalytical method for analysis of the disc-type permanent magnet hysteresis motor in steady-state operational conditions

Behniafar¹,

Darabi²

2018

Turk J Elec Eng & Comp Sci

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Considering the characteristics of hysteresis and permanent magnet motors, it seems that these two motors are complements of each other. Thus, their combination yields a motor with an excellent performance. In order to preserve the major advantages of both motors in the new motor, a disc-type slotless structure is chosen. This paper presents a new finite-element method for the modeling of disc-type permanent magnet hysteresis synchronous (PMHS) motor. In this modeling method a new iterative algorithm is used. Programming software has been linked to finiteelement software because of its limitation in the modeling of hysteresis phenomena. Validity of the proposed analysis is checked by experimental results. Reasonably close agreement between the two is obtained and good performance of the PMHS motor is verified.

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Effects of samarium cobalt permanent magnet on the performance of polyphase hysteresis-reluctance motors

Cited by 10 publications

References 5 publications

Comparison between coreless and slotless kinds of dual rotor discs hysteresis motors

Comparison between coreless and slotless kinds of dual rotor discs hysteresis motors

A new design algorithm for the PMHS motor considering the combination ratio

A new semianalytical method for analysis of the disc-type permanent magnet hysteresis motor in steady-state operational conditions

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