Electric Motor Design, plus stuff
Summary YASA just announced a prototype axial-flux motor with an unprecedented 59 kW/kg peak power density. That’s roughly triple the power density of today’s top EV motors. In this post,I take a quick engineering look at what’s behind this number The post Analysis of the YASA Record-Breaker Axial Flux Motor, and What Everybody Gets Wrong appeared first on Antti Lehikoinen .
Preface I had already written this post up to the analytical methods section when WordPress saw fit to lose all my progress for some reason. So, if you get an aura of pissed-offness from the first few sections, it s not The post On Eddy-Current Iron Losses appeared first on Antti Lehikoinen .
Summary You may have come across the term fluid flux barrier , or fluid barrier , or in any case fluid-something, in the context of synchronous reluctance motors. I certainly have, on multiple occasions. In fact, I encountered the term multiple times The post Fluid Flux Barriers appeared first on Antti Lehikoinen .
Summary Getting started in consulting electric motor design. The title says it all. Just my condensed thoughts on the topic. Colossal Disclaimer I. Do. Not. Teach. Consulting. There, I said it. I mean, if you take one thing out of The post Getting Started in Consulting Electric Motor Design Version appeared first on Antti Lehikoinen .
The split ratio, defined as the rotor OD divided by the the stator OD, is one of the key dimensions defining the performance of an inrunner electrical machine. For a (relatively) fixed OD and stack length, it s probably the most The post On split ratios appeared first on Antti Lehikoinen .
Finding the operating point of an electric motor is no longer as simple as it used to be. I mean, in the past, or in the textbooks and course slides we often see during our studies, it was simple. Just The post Finding the operating point of a motor appeared first on Antti Lehikoinen .
Which is better - axial or radial flux? The correct answer is complex and depends on a million things, but here's a first-principles comparison. The post Axial versus Radial Flux First Principles appeared first on Antti Lehikoinen .
Tesla Model S Plaid will apparently have carbon fiber retaining sleeves in their motors. Here are some thoughts on what this might mean. The post Tesla s Carbon-Wrapped Motor appeared first on Antti Lehikoinen .
Mahle's new EV motor is marketed with being rare-earth free and wirelessly excited, but what is the reality? Here are some first thoughts and impressions. The post Mahle Magnet-Free Motor First Impressions appeared first on Antti Lehikoinen .
Here s a no-brainer tip for you: space vectors are useful when designing electric motors. Duh. However, there s one specific detail you might not know: they are also extremely handy when computing the back-EMF waveform, or induced no-load voltages. Specifically, they The post Computing Back-EMFs with space vectors appeared first on Antti Lehikoinen .
How to compute flux linkages of a coil, using the results of 2D finite element analysis. Nice to know information, with occasional professional uses. The post Computing Flux Linkages in 2D appeared first on Antti Lehikoinen .
Linear Labs - have been making quite sizable waves in the recent year or so. But how revolutionary is their HET motor, really? The post Evaluation of the Linear Labs HET motor appeared first on Antti Lehikoinen .
Electric motors come with various number of poles. But why is that the case, and what are the benefits and drawbacks of an increased number? The post Pole count The Good, the Bad, and the Ugly appeared first on Antti Lehikoinen .
Why two popular torque formulas, based on Lorentz force and magnetic shear stress, are in fact the SAME formula and thus yield identical results. The post Shear Stress versus Lorentz Force appeared first on Antti Lehikoinen .
Interview of Rahul Gonsalves, CEO of DARWYN. The post Interview: Rahul Gonsalves from DARWYN appeared first on Antti Lehikoinen .
How does the peak torque capacity of an axial-flux motor compare to radial-flux. Read here to find out, kinda. The post Axial-Flux Machines Part 2 appeared first on Antti Lehikoinen .
Interview series on the motorsphere movers and shakers. This time, Arlissa Vaughn from Aegis Power Systems. The post Interview: Arlissa Vaughn from Aegis Power Systems appeared first on Antti Lehikoinen .
they, really? And are they as good as promised? Read to find out! The post Axial-Flux Machines Part 1 appeared first on Antti Lehikoinen .
What are the most important dimensions for switched and synchronous reluctance motors? The same ones as for all motors, luckily - click for details! The post SRM vs SynRM Important Dimensions appeared first on Antti Lehikoinen .
Hypehypehypehypehypehypehypehypehype Alright, let s be serious. Interest in machine learning is booming. (And I refuse to use the term artificial intelligence or AI there s nothing intelligent in being able to do a very tightly defined task quite well). Anyways, I ve gotten some The post A.I. and Electrical Machines appeared first on Antti Lehikoinen .
How to get a job, or some informal tips for job-seeking. Not a comprehensive list by far, just some general observations and opinions to help you out. The post How to get a job appeared first on Antti Lehikoinen .
Which one is better - an SRM or a SynRM? You won't find the answer here, but you'll get some tools to make the decision yourself. The post SRM vs SynRM Performance Basics appeared first on Antti Lehikoinen .
My guest post at Revonte.com covers the optimization of an e-bike powertrain: the benefits of a CVT transmission, along with other basic principles. The post Optimization of an e-bike drivetrain appeared first on Antti Lehikoinen .
Ever wondered what switched and synchronous reluctance machines are? Well, this post here covers the basics - how they work and where they differ. The post Switched and Synchronous Reluctance Machines appeared first on Antti Lehikoinen .
What are BLDC motors? And how do they differ from AC motors? Why do people keep using such contradictory terms and confusing us? The post What are BLDC motors? appeared first on Antti Lehikoinen .
Video of induced eddy currents in a lamination steel sheet - plus how they can be computed. There's a SMEKlib example too for you to try! The post Induced eddy currents in sheet SMEKlib example appeared first on Antti Lehikoinen .
Maglev - magnetic levitation - systems can be quite different from electric motors. So how to model them without time-consuming 3D simulations? The post Maglev Systems How to model them analytically? appeared first on Antti Lehikoinen .
The Poyinting vector is quite rarely used in electric motor design. However, this underutilized tool can be extremely useful in the right hands. The post Poynting vector and motor design appeared first on Antti Lehikoinen .
Matlab and Python are both popular languages, but which one is better? You won't find an explicit answer here, but a few factors to consider. The post Matlab versus Python in numerical analysis appeared first on Antti Lehikoinen .
Circulating and eddy currents combined with PWM supply, illustrated with a nice video. What more could you wish for, really? The post Video: Circulating and eddy currents with PWM supply appeared first on Antti Lehikoinen .
An active magnetic bearing system can be directly integrated into an electric motor, resulting in a self-levitating motor. Here's how it works. The post How a self-levitating motor works appeared first on Antti Lehikoinen .
Ever wondered how 3D magnetics works, with finite element analysis? Now you can learn, with a simple SMEKlib example. The maths is anything but, sorry. The post Introduction to 3D Magnetics with SMEKlib appeared first on Antti Lehikoinen .
What are circulating currents, why are random-wound windings called random, why should you care? Find out here, with convenient bullet points! The post Circulating currents Post-it version appeared first on Antti Lehikoinen .
Active magnetic bearings are widely used in high-speed machines and sensitive environments both. Here's what they are, and how they work. The post Introduction to active magnetic bearings (AMB) appeared first on Antti Lehikoinen .
No time to waddle through dozens of pages full of mathematics? Here's how FEA works - the sticky note version! Basic math skills required. The post How FEA works Post-it version appeared first on Antti Lehikoinen .
Lagrange multipliers are a handy way of adding constraints to an FEA problem. Be careful with them, though - or don't trust your results. The post Lagrange multipliers and their physical meaning appeared first on Antti Lehikoinen .
A commonly-used approach for torque computation utilizes the virtual work principle. Here's what it is, and what options you have with it. The post Options for (Analytical) Torque Computation Part 3 appeared first on Antti Lehikoinen .
More methods for analytical torque computation. Somewhat more advanced than previously, but still simple and fast. A little more versatile, too. The post Options for (analytical) torque computation, part 2 appeared first on Antti Lehikoinen .
Analytical torque computation - aka pen-and-paper stuff. Fast, efficient, extremely enlightening - and unfortunately fairly complex, more often than not. The post Options for (analytical) torque computation Part 1 appeared first on Antti Lehikoinen .
Knowing the torque of an electric motor is kinda important, so it makes sense to double-check your results by using an alternative computation method. The post Options for (numerical) torque computation appeared first on Antti Lehikoinen .
The title says it all. 6 things you might not know about finite element analysis, but should. A bit tongue-in-cheek, but still valid info. The post 6 Things you might not know about finite element analysis appeared first on Antti Lehikoinen .
The SMEKlib library (open-source FEA for electrical machines in Matlab) just received a huge update. Here's a brief rundown, plus associated rambling. The post SMEKlib update appeared first on Antti Lehikoinen .
No matter what happened globally, on my personal level 2017 was a great year. Here's a short rundown of the highlights, and what's next. The post Late 2017 Review appeared first on Antti Lehikoinen .
Torsional vibrations lead to oscillations in the electromagnetic torque, too. These may dampen the vibrations, but they may also do the exact opposite. The post Stability of Torsional Vibrations appeared first on Antti Lehikoinen .
Of mechanics in electrical machines, torsional vibrations are often the most critical. Read here to learn the basic principles, and how to analyze them. The post Torsional Vibrations in Electrical Machines appeared first on Antti Lehikoinen .
Vibrations in electrical machines can be divided into several categories, differing on the mechanism and type of vibrations produced. The post Vibrations in Electrical Machines appeared first on Antti Lehikoinen .
You may have seen the term "second-order finite elements" mentioned once or twice. But what are they really, and where are they used? Read to learn. The post Second-Order Finite Elements Why, How, and When appeared first on Antti Lehikoinen .
Nicola Chiodetto is a PhD student at the Newcastle University developing superpowered electric motors for aircraft use. Read his interview here. The post Awesome Interview: Nicola Chiodetto and Electric Aviation appeared first on Antti Lehikoinen .
A brief introduction to my doctoral thesis titled "Circulating and Eddy-Current Losses in Random-Wound Electrical Machines". The post Circulating and Eddy-Current Losses in Random-Wound Electrical Machines appeared first on Antti Lehikoinen .
D.Sc. time. Soon. Hi folks! Just a brief, wholly me-centric post about, well, me today. Long story short: I recently successfully defended my doctoral thesis last Friday (15 September 2017). So, I should be officially getting my degree later this The post Getting my Doctoral Degree (Tech.) just about now appeared first on Antti Lehikoinen .