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  1. T

    Legit electric motor technology breakthrough?

    Worth noting that their "mechanical field weakening" will not avoid the torque penalty. By mechanically field weakening you reduce the effective strength of the magnets and thus get less torque, same as with IPMs. It's physically impossible to make a motor without this problem. The difference...
  2. T

    SPM VS IPM Motor - And Field weaken, is it worth it

    You're correct that power factor is maximized when the current vector is perfectly aligned with the voltage vector. There are really two EMFs in a salient motor with permanent magnets (IPM) The magnets in an IPM produce an EMF which is aligned with the q axis. This is traditional BEMF. If...
  3. T

    Vq/Vd ratio of different motors and consequences

    You're correct that this phenomenon is related to saliency and flux weakening. In general for a permanent magnet motor, there is flux on the D axis due to the permanent magnets, and there is flux on both the D and Q axis due to the currents through the coils. Mathematically (neglecting motor...
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