Because there's sparking in DC motors, they are inherently less efficient than say AC motors are,
The trick with AC motors is that they run primarily at the frequency of their power source. What happens when the power source can change it's frequency and amplitude? The motor can behave
as well as any DC motor.
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Comparison of space vector modulation techniques based onperformance indexes and hardware implementation
Space-vector (pulse width) modulation technique is a PWM technique for three-phase voltage-source inverters. Read the white paper I linked below, or the app note that I also linked below. Interested in the real nitty gritty? Try the PhD Thesis that I linked below.
There does not seem to be an under vector room, but there is vector space. Vector space is a structure that is formed by a collection of vectors. This is a term in mathematics.
Vector spaces can be formed of vector subspaces.
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