Compared with induction machines and switched reluctance machines, one of the novel features of permanent magnet brushless machines is that there exhibit numerous machine topologies. In this presentation, novel topologies and performance features of various permanent magnet brushless machines will be presented and potential applications highlighted. These include (a) Halbach machines, (b) Fractional slot machines, c Magnetic geared machines, (d) Double salient and flux reversal machines, (e) Various switching flux machines, (f) Various hybrid excited machines, (g) Other machines, such as soft magnetic composite (SMC) machines, dual mechanical port machines, and fault-tolerant machines, as well as (h) Magnet less machines.

Energy saving of electrical appliances and electric vehicles (EV) require reduction of power consumption of motors. The motors applied to these apparatus operate at variable speed. Furthermore, the motors operate with small load at stationary mode and with large load at starting mode. A permanent magnet motor can operate with high efficiency at rated point. However, the efficiency is lower at small load or high speed because the large constant-magnetic-force generates the large core loss. Furthermore, the flux-weakening current to depress voltage at high speed generates the large copper loss. Then, a new technology, which controls the magnetic flux of permanent magnets depending on the load or speed of the motor, is investigated. We introduce new motors that can change magnetic flux of permanent magnets.

This paper proposes a new rotor design for flux-intensifying interior permanent magnet synchronous machine (FI-IPM SM) which has similar torque-speed and power capabilities to a traditional flux-weakening IPM SM (FW-IPM SM). Design steps for the rotor structure of the new machine are laid out and discussed to emphasize key designing challenges. The proposed FI-IPM SM and a FW-IPM SM with similar torque-speed capability, are made to evaluate performances in power conversion as well as self-sensing capability at very low speed. Finite-element analysis (FEA) is used to evaluate the machine performances. The proposed FI-IPM SM shows less variation in the saliency when the machine is loaded, leading to a possibility of better self-sensing performance at very low speed as compared to the traditional FW-IPM SM. Experimental results on the self-sensing performance of these two machines are also shown for verification.

In response to recent issues concerning rare-earth materials, this paper presents research and development results of hybrid excitation motor (HEM) as a candidate of less rare-earth permanent magnet and high power density machine for electric propulsion system installed on automotives, which is supported by NEDO. 3D-FEA-based design and performance prediction using JMAG-Studio demonstrates that the proposed motor makes possible to reduce the volume of rare permanent magnet by approximately half of that used in IPM motor for LEXUS RX400h while keeping the power density intact. The design and performance prediction results in terms of variable flux control and high torque capabilities are verified by experimental test using a trial manufacturing of the downsized motor.

Many of the designers of control systems have been forced to resolve conflicting issues between “High quality and Complex System” and “Shorten Development Time” and they believe that “Model Based Development (MBD)” is a powerful approach to solve these problems, which is often applied in the field of control system development. In many case studies this development approach seems to apply universal but in order to success in MBD, we need to solve the following two points.

1. How fast do you build real-time environment including hardware and software (models) and how improve the accuracy of the plant model itself upstream.
2. How do you make enormous effort of downstream experiments and parameter tuning more efficient.

In this presentation, we introduce a couple of solution for motor designers and developers to solve these problems by using an accurate Motor-HIL simulator achieved by combination between JMAG-RT and NI’s COTS products and automated control parameter tuning by combination with optimization tools.

Electrical Motors specifically and Power electronics in general are mechanical systems that produce noise and vibrations. In most cases, the noise and vibration is unwanted for environmental, functional or comfort purposes. The presentation will address the different aspects of the noise, including cooling fan noise, unbalance noise and Electromagnetical noise. It will be demonstrated how recent technologies in acoustics can be applied to simulate, analyse and address the noise of electrical machinery.
In a second part of the presentation the scope of the collaboration between JSOL and LMS will be highlighted in view of interfacing JMAG and Virtual.Lab products, resulting in a premier solution for Noise and Vibration analysis.

Technology to raise the performance of home appliances including air conditioners and washing machines is making progress recently, such as high efficiency, low vibration, low noise.
MCU, inverters, and motors are starting to be modeled and simulated in motor development as a key technology for energy conservation and noise reduction.
IPM(Interior Permanent Magnet)Motors are used as a motif to analyze and simulate in both MATLAB and JMAG-RT which can obtain the same results as real object, i. e. the current is warped by the current phase.
Inconsequence, a simulation model which can simulate synthetically with considerations of the motor’s magnetic circuit, inverter, and software implemented in MCU can be obtained.

In recent years for motor drive systems, the motor design and the control development need to be undertaken simultaneously to achieve higher quality under even stricter development schedules. This presentation introduces how to create highly accurate motor models using JMAG-RT for new motor designs, run motor simulations linking to the motor control, and then use the results that are obtained to provide feedback to the motor design and the control development. In addition, Hardware in the Loop Simulation (HILS) with JMAG-RT built-in is examined as a real time simulator and an example linking our drive products with highly accurate motor models is also introduced.

A new type of DC brushless motor was developed as the drive motor for a fuel cell electric vehicle, the Honda FCX Clarity. A more compacted design was achieved by integrating a power drive unit in addition to using a gearbox with a coaxial structure. The magnetic circuit was also optimized by implementing an IPM rotor to gain higher rotation speed to improve maximum speed as well as higher output to improve engine performance. The drive unit reduced the length by 162 mm and the height by 240 mm through the innovations above when compared to conventional models. Furthermore, the drive motor performance reached a maximum output of 100 kW and a maximum torque of 256 Nm.
This motor has contributed to expanding cockpit space and increasing drive performance and cruising distance above conventional 2.4 liter gasoline vehicles.

The current waveform of the real drive status is reproduced highly accurately by linking to the motor control using JMAG-RT resulting in the precision of the loss calculation for the drive motor of the hybrid vehicle to improve. The influence on various losses by the differing current waveforms is reported in this case. Moreover, case studies for loss analysis by linking to control are introduced.

Currently, people are able to control a door lock from a distant point outside of a vehicle. Recently, a door lock system has been developed to detect an owner approaching and unlock when he/she grips a door handle. In this system, an antenna detects the existence of an owner with his electrical key within a 3000 mm radius around the vehicle. As the performance of the antenna decides the operating area, it is essential to grasp directivity and confirm that there are no dead areas. In this report, we will describe how we have developed a technique to predict directivity of an antenna using the electromagnetic field analysis software, JMAG.

Through connecting with JMAG-Designer, modeFRONTIER has contributed to many JMAG Users, providing Automation, statistical analysis using Design of Experience and Multi-Objective Optimization. However, for the users who are not good at programming, it could be difficult to connect modeFRONTIER and JMAG-Designer. Therefor, JMAG-Designer Direct Interface is developed now. The users can connect both without any program. We will demonstrate it on the day.

Motor HILS (Hardware-in-the-loop simulator) has been recognized for many years now as an essential design and testing tool of motor drives, for increased product reliability, shorter time to market and lower total design cost. However, there remained many needs of the motor HILS to be addressed. Among these needed features are: more accurate models, more powerful simulators with distributed processing, etc.

Finite-Element Analysis based motor HILS, resulting from the integration of JMAG-RTR tool with RT-LABR simulator, addresses and fulfills these requirements. JMAG-RT-based Motor HILS of a complete permanent magnet synchronous motor drive can be conducted today on RT-LAB HILS at sub-microsecond time steps on powerful new FPGA resulting in unprecedented simulation accuracy. And the integration with multi-processor platform yields a full motor HILS with high accurate motor model, ultra-fast drive simulation and distributed multi-rate simulation enabling the integration of other parts of the designed system (electrical, mechanical, hydraulic, etc), for a complete system HILS.

The presentation discusses all these items and describes the latest advancements in motor HILS.

This motor consists of a permanent magnet, iron yoke and four GMM rods, which the magnetostriction controlled by PZT changes the flux distribution on four magnetic poles. This motor has advantages of low power consumption and low heat generation compared with a conventional system with electromagnetic actuators.

Large power transformer for a power station is generally applied Isolated Phase Bus (IPB) between the transformer and the generator, and IPB connection box is mounted on the low voltage side of the transformer. Because very large current flows through the IPB, there is a concern of local heating on the metallic parts around the IPB due to the influence of the magnetic flux. In this paper, it is reported that 3-D magnetic analysis is performed to grasp the phenomenon visually and numerically by using JMAG and evaluate it.

The magnetic properties of magnetic materials are considerably changed near the Curie temperature. In order to analyze the magnetic characteristics of magnetic devices which operate at high temperature, such as induction heaters, the consideration of the temperature dependence of B-H curves and iron loss curves is necessary for the precise analysis.
In this paper, the measuring method of magnetic properties at high temperature using a ring specimen is examined, and a technique to improve the accuracy is investigated considering the expansion of the specimen at high temperatures and the problem of using a mean magnetic path length nearly at the Curie temperature. The eddy current and temperature distribution of an induction heater are analyzed considering the heat emission, heat conduction and temperature dependence of magnetic characteristics which are measured by us. It is shown that the calculated values of temperature are in good agreement with the measured values.

Vibration and noise of motors, especially harsh electromagnetic noises, are explained in an easily comprehensible manner using both fundamental theories and practical case studies of noise-reduction.
Recently, the demand of resolving noise issues is increasing as a result of growing concern about environmental problems. Meanwhile, as electric vehicles are becoming more popular, noise reduction on electric motors which are the major noise source of various electrical equipments such as electrical home appliances and medical equipment, have become a necessity.
The never-ending challenges of motor technology such as (1) noise reduction, (2) higher efficiency, and (3) miniaturization are important to both manufacturers and end-users. Noise reduction is considered one of the most difficult problems to resolve.
Countermeasures for motor vibration and noise including (1) electromagnetic force acting as the excitation force, (2) motor structures transfer system, and (3) vibration transmission to other mechanical equipment are necessary. In other words, reduction of motor noise requires sufficient understanding of mechanism causing the noise and the structure transferring the vibration.
Simulation analysis as well as theoretical calculation methods and measuring methods of magnitude and frequency of electromagnetic forces causing the electromagnetic noise are described in an easily comprehensible manner. Furthermore, structural characteristics of motors, specifically the measurement of mechanical natural frequencies and finite element simulations that are applicable in actual analysis work, will be explained.

– This seminar is for users that have purchased the DS module for JMAG.

– A separate registration from JMAG Users Conference is required.
Available for up to 30 participants.

Magnetic gears have some advantages such as maintenance-free operation and self-overload protection that are not observed in mechanical gears. Though a century has passed since a magnetic spur gear was suggested, they were not in practical use due to the low transmission-torque density. But, recently, the practical transmission-torque density could be obtained by developing a magnetic harmonic gear (MHG) operating with harmonic magnetic flux.
We have developed the cogging torque reduction method of MHG to reduce the vibration caused by the cogging torque. But, few studies regarding electromagnetic vibration have not been seen. This paper describes the electromagnetic vibration of a MHG by employing the coupled analysis between magnetic field and structure, and the results are verified by carrying out measurements by a prototype.

Generally, chip inductance is known to have varying magnetic properties caused by the effects of stress during manufacturing which also effects the electric properties such as inductance. These effects were examined using stress, magnetic, and coupled analysis to assist in the design and development through analytical understanding.

– Corporate Introduction
– Background to Implementing JMAG
– Description of the Analysis Target and Testing
– Each Parameter Affecting the Mesh
– Guidelines for Optimal Mesh Divisions
– Comparing the Tested Results to the Simulated Results

There are many benefits that can be achieved to uniformly refine and concentrate the components of crystals through stirring systems in material manufacturing processes.
Among the stirring systems that are available, electromagnetic stirring systems are known to be highly effective, especially electromagnetic tornado stirring systems, because they can control the flow of fluids three dimensionally.
The application of electromagnetic stirring systems using conventional copper magnets is minimal due to high operation costs caused by the large Joule losses that occur.
By replacing the copper magnets with AC superconducting magnets, manufacturing of highly concentrated Si aluminum alloy capable of miniaturization as engine materials in automobiles and airplanes becomes possible through energy conservation and powerful electromagnetic Lorentz force.
The performance of a tornado stirring system was evaluated by building a superconducting electromagnetic stirring system for electromagnetic stirring that has rotational stirring, vertical stirring, and tornado stirring which combines both rotational and vertical stirring.
In addition, the analysis results for the magnetic field and electromagnetic force produced using JMAG-Designer 10.3 by modeling the molten metal and superconducting magnets was compared to the test results.
The effects of rotational stirring, vertical stirring, and electromagnetic tornado stirring were evaluated using metal gallium, which is a liquid at room temperature, with an electromagnetic tornado stirring system.
This showed conclusively that the analysis results obtained in JMAG and the test results matched.

Designers rather than CAE-engineers at the Tohoku Pioneer Corporation utilize JMAG-Designer for the design and development of magnetic circuits for loudspeakers.
This presentation introduces the configuration and environment necessary to use JMAG-Designer as a tool for designers to examine magnetic circuits in the design process.

In recent years, the technical development of brushless motors for a higher output density and miniaturization are increasing with the demand for energy efficient motors as the cost of raw materials rises around the world.
This presentation examines the magnetic pathways of motors three dimensionally to achieve a brushless motor that has a higher output density focusing on analysis examples that utilize the CAD link features provided in JMAG-Designer.

Sintered Nd-Fe-B magnets are applied for many mechatronics fields but their physical properties are not sufficiently investigated. As a result, they are poorly-modeled in the simulation study.
We will therefore introduce the research results, including thermal demagnetization, electric conductivity, and thermal expansion.
Concerning thermal demagnetization, we will compare the measurement results with the JMAG analysis results.

Design and development that efficiently increases quality while reducing the cost and time required is necessary for electric/hybrid electric vehicles. This presentation attempts to explain the mechanism of later magnetizing interior permanent magnets while trying to discover new innovation by utilizing JMAG.