Ya, same here. I've done a bit of reading & it seems 3 phase DC brushless motors are becoming more commonplace due to their efficiency. It appears that most are controlled using a PWM (pulse width modulated) signal but the folks at Blue Eco have decided that a sine wave is a better design than PWM to run the motor more reliably. Probably another reason for the higher cost, since the controller would be more complex to produce a 3 phase sine wave.
So looks like my initial musings about the motor actually being AC were wrong! I must eat crow!
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