'Virtual magnet' claims clarify why EVs rely on rare-earth permanent magnets
A Bengaluru startup, Vimag Labs, claims to replace rare-earth permanent magnets in motors with 'virtual' magnets using copper coils and software. However, this article explains that software only controls current flow in electromagnets, not creates magnetism itself. While electromagnets are used in large generators, they are less efficient for electric vehicles (EVs) compared to permanent magnets. EVs prioritize efficiency for range and cost, making permanent magnet synchronous motors dominant due to their high efficiency. Attempts to use electrically excited motors or switched reluctance motors have faced challenges with efficiency, starting torque, and noise, highlighting why rare-earth magnets remain crucial for EV performance.
Key Points
- Vimag Labs claims to use 'virtual magnets' in EV motors by replacing rare-earth permanent magnets with copper coils and software.
- The article clarifies that software controls current in electromagnets, but doesn't create magnetism, and this approach is generally less efficient than permanent magnets.
- High efficiency is critical for EVs to maximize range and reduce battery cost, making permanent magnet synchronous motors dominant.
- Alternatives like electrically excited motors and switched reluctance motors face challenges in efficiency, starting torque, and noise, underscoring the need for rare-earth magnets.
Exam Facts
- Startup: Vimag Labs (Bengaluru).
- EV motor types: Permanent magnet synchronous motors, electrically excited motors, switched reluctance motors.
- Companies trying alternatives: BMW, Renault, Honda (with Enedym), Hitachi Astemo.
- Nikola Tesla invented the three-phase induction motor in 1888.
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