Performance characteristics improvement of a PM disk motor by using soft magnetic composite material (original) (raw)
Related papers
Analysis of Novel Brushless DC Motors Made of Soft Magnetic Composite Core
IEEE Transactions on Magnetics, 2012
The soft magnetic composite material has merits of the low eddy current loss and the flexible machine design and assembly. This paper develops new brushless DC motors made of this material. The shape of the developed motor is similar to a hybrid type stepping motor, which utilizes three-dimensional isotropic ferromagnetic behavior, and the motor has hollows in the stator main teeth in order to reduce the copper loss and the motor size. This paper clarifies the steady state characteristics of the motors using the three-dimensional finite element analysis. The motor efficiency becomes larger than that of the conventional laminated core, when the rotating speed is high, or if the motor size becomes large.
Soft Magnetic Composite Core - A New Perspective For Small AC Motors Design
In the paper is presented a new design of a small permanent magnet AC motor, based on the application of the soft magnetic composite (SMC) material, patented under the trade name Somaloy TM 500 by Hoganas AB, Sweden. The new possibilities and perspectives of the SMC are analysed. This experimental work is a step further of the previous authors' research, dealing with a detailed electromagnetic field analysis of a self-starting single-phase permanent magnet synchronous motor. The Finite Element Method (FEM) has been used for evaluation of proposed new designs and estimation of the performance behaviour of the developed models. A detailed analysis of advantages of the stator core made of SMC, in comparison with laminated steel is presented; the particular emphasis is put on the losses and efficiency of the motor.
Design and analysis of a claw pole permanent magnet motor with molded soft magnetic composite core
Soft magnetic composite (SMC) materials and SMC electromagnetic devices have undergone substantial development in the past decade. Much work has been conducted on designing and prototyping various types of electrical machine. However, the iron cores were often made by cutting existing SMC preforms that were formed by compacting SMC powder in simple cylinder or bar-shape molds, and the magnetic properties of the cores may deteriorate significantly during the cutting process. To investigate "industry production-ready" products, this paper presents the design and analysis of a claw-pole permanent magnet (PM) motor with a molded SMC core of low mass density to replace the existing induction motor in a dishwasher pump. The magnetic properties of the molded SMC core are measured and utilized in the motor design and analysis. Finite element analysis (FEA) of magnetic field is carried out to accurately determine key motor parameters, and an improved phase variable model is applied to predict the motor performance. Both parameter computation and performance prediction are validated by the experimental results on the prototype.
A new structure of universal motor using soft magnetic composites
IEEE Transactions on Industry Applications, 2004
The universal or ac commutator motor, widely used in hand tools and domestic appliances generally uses a two-pole stator with a concentrated winding and an armature with interlocked coils elements. The copper volume and the axial length of the end windings of such conventional structures are then usually very important. In this paper, the authors present a new universal motor structure based on an efficient use of the isotropic magnetic properties of the soft magnetic composites and on the concentrated winding technique. The stator core presents a claw-pole structure and the armature has a concentrated winding with several coils wound around the same tooth. With this new ac commutator motor structure, a reduction of the total volume by a ratio equal to 200% is obtained when compared to a classical universal motor structure with nearly identical performance.
Impact of Soft Magnetic Material on Construction of Radial Flux Electrical Machines
IEEE Transactions on Magnetics, 2000
Electrical machines with distributed concentrated windings are challenging the selection of the soft magnetic materials due to stator design and power conversion efficiency. A shorter magnetization path and relatively high magnetization frequency is beneficial for low-permeability soft magnetic materials with low power losses in the core. In this paper, a three-phase machine with laminated and iron powder cores is analyzed with focus on a modular winding design, the torque capability, and the stator energy conversion efficiency. Different iron powder cores are compared to a laminated core using 2-D finite element analysis (FEA). The three-phase machine torque is compared among a conventional distributed concentrated winding, an axially distributed wave-winding, and a number of circumferentially distributed wave-winding segments. According to 3-D FEA, the conventional coils are preferred if the permeability of the core is low. Index Terms-Machine design and windings, soft magnetic composites, 2-D and 3-D finite element (FE) analysis.
Comparative study of 3-D flux electrical machines with soft magnetic composite cores
IEEE Transactions on Industry Applications, 2003
This paper compares two types of threedimensional (3D) flux electrical machines with soft magnetic composite (SMC) cores, namely claw pole and transverse flux machines. 3D electromagnetic field analysis is conducted for the computation of some important parameters and optimization of the machine structures. An Equivalent electric circuit is derived to calculate the machine performances. The analysis methods are validated by experimental results of a single phase claw pole permanent magnet machine with a SMC core. Useful conclusions are drawn from the evaluation and comparison of two machines with soft magnetic composite cores.
2009 IEEE Energy Conversion Congress and Exposition, 2009
SMC (soft magnetic composite) materials and SMC electrical machines have undergone significant development in the past decade. For the molding of the SMC core, if a high productivity low pressure press is used, the manufacturing cost can be dramatically reduced. However, the magnetic properties of the SMC core and the machine performance are highly dependant on the mass density of the core. This paper presents the development of a claw pole permanent magnet motor with a low mass density SMC stator core molded at low pressure which can replace the existing single phase induction motor in a dish washer pump. The developed SMC motor has been prototyped and tested. Both the parameter computation and performance prediction are validated by the experimental results. These show that the low mass density SMC core is suitable for low cost mass production of SMC electrical machines.
Effect of Laminated Core Body Size on Motor Magnetic Properties
Magnetism
The magnetic characteristics of electromagnetic steel sheets used for motors are evaluated under ideal sinusoidal excitation. However, in actual equipment driving, excitation by pulse-width modulation (PWM) waves is the mainstream method. Therefore, it is necessary to clarify how the magnetic properties used in motors are changed by sinusoidal excitation and inverter excitation. To clarify the magnetic properties of the laminated core by inverter excitation, samples with different core sizes were prepared and the effects on the magnetic properties were then investigated. The magnetic properties were measured by changing only the input voltage VDC while maintaining the carrier frequency and modulation factor constant. As the results, the iron loss values of the small, medium, and large samples with inverter excitation were 6.05, 9.58, and 11.62 W/kg, respectively. The iron losses of the small, medium, and large toroidal cores with inverter excitation increased by 124.9, 256.1, and 33...
IEEE Transactions on Magnetics, 2000
This paper deals with the design and test of a permanent-magnet machine based on a novel modular stator concept. The manufacturing and recycling costs are minimized thanks to the use of composite magnetic materials (plastic bonded magnets, soft magnetic composites). The main properties of composite magnetic materials, from a magnetic and mechanical point of view, are briefly presented in the first part of this paper. After focusing on their thermal properties by detailing a thermal experimental study, the proposed concept of a modular permanent-magnet machine is described. Experimental characterization of the realized prototype, in static and dynamic operating modes, demonstrates its advantages compared with conventional structures.
Amorphous Soft Magnetic Core for the Stator of the High-Speed PMBLDC Motor With Half-Open Slots
IEEE Transactions on Magnetics, 2016
Several papers have appeared in recent years on application of the amorphous soft magnetic materials in the stators of the electric motors. In our previous work, we demonstrated that the replacement of a slotless stator from the FeSi electrical steel with the stator from an amorphous alloy Metglas 2605 SA1 in a high-speed permanent magnet brushless direct current (PMBLDC) motor resulted in a substantial decrease of power losses in this stator, even by three times at the rotary frequency of 70 000 rpm. This work was concentrated on the development of the cores for stators with halfopen slots, which are technologically more difficult to produce than the slotless cores. The cores were made by cutting out suitable amount of 25 µm thick rings from the FeSiB amorphous ribbon by a laser technique, followed by stacking up the rings and their consolidation, and suitable heat treatment of the compressed stacks. Next, measurements of the magnetic properties of the sample cores with half-open slots were made using the Remacomp C-1200 hysteresisgraph and the Lakeshore 450 gaussmeter. Based on the results of measurements, the sample cores of different heights (17.5 and 10 mm) were selected for application in a stator of the prototype high-speed PMBLDC motor, 800 W in rated power and with a maximum rotary speed of 60 000 rpm. The preliminary performance tests with this prototype motor showed that after 1 hour of uninterrupted operation, temperature of a motor housing did not exceed 60 0 C. It was also found that operating efficiency of the PMBLDC motor incorporating a stator with half-open slots, made from an amorphous material, was almost 90 % over a wide range of torques (from 40 to 140 mN•m).