Antti Lehikoinen

Electric Motor Design, plus stuff

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Research and work

On split ratios

Antti (admin) 22nd August 202422nd August 2024 Research and work 3 Comments

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…

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Finding the operating point of a motor

Antti (admin) 31st March 202331st March 2023 FEM, Research and work 2 Comments

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…

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Axial versus Radial Flux – First Principles

Axial versus Radial Flux – First Principles

Antti (admin) 5th November 20215th November 2021 Electrical engineering, Research and work 3 Comments

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.

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Computing Back-EMFs with space vectors

Computing Back-EMFs with space vectors

Antti (admin) 21st December 202021st December 2020 FEM, Research and work No Comments

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…

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Computing Flux Linkages in 2D

Antti (admin) 20th October 202020th October 2020 FEM, Research and work 4 Comments

How to compute flux linkages of a coil, using the results of 2D finite element analysis. Nice to know information, with occasional professional uses.

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Pole count – The Good, the Bad, and the Ugly

Pole count – The Good, the Bad, and the Ugly

Antti (admin) 3rd September 20194th November 2019 Electrical engineering, Research and work 2 Comments

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?

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Shear Stress versus Lorentz Force

Shear Stress versus Lorentz Force

Antti (admin) 31st May 20196th June 2019 Research and work No Comments

Why two popular torque formulas, based on Lorentz force and magnetic shear stress, are in fact the SAME formula and thus yield identical results.

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Axial-Flux Machines – Part 2

Axial-Flux Machines – Part 2

Antti (admin) 7th April 20198th April 2019 Electrical engineering, Research and work No Comments

How does the peak torque capacity of an axial-flux motor compare to radial-flux. Read here to find out, kinda.

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Axial-Flux Machines – Part 1

Axial-Flux Machines – Part 1

Antti (admin) 22nd March 201922nd March 2019 Electrical engineering, Research and work 2 Comments

they, really? And are they as good as promised? Read to find out!

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SRM vs SynRM – Important Dimensions

SRM vs SynRM – Important Dimensions

Antti (admin) 14th January 201914th January 2019 Electrical engineering, Research and work No Comments

What are the most important dimensions for switched and synchronous reluctance motors? The same ones as for all motors, luckily – click for details!

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Recent Posts

  • On split ratios
  • Finding the operating point of a motor
  • Axial versus Radial Flux – First Principles
  • Tesla’s ‘Carbon-Wrapped’ Motor
  • Mahle Magnet-Free Motor – First Impressions

Recent Comments

  • Alexander Shendi on On split ratios
  • Antti (admin) on On split ratios
  • Pär Ingelström on On split ratios
  • Antti (admin) on Matlab versus Python – in numerical analysis
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