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A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and single-phase AC motors above 10 hp (7.5 kW) are uncommon. Three-phase motors also vibrate less and hence last longer than single-phase motors of the same power used under the same conditions. [32]
For example; a single-phase motor with 3 north and 3 south poles, having 6 poles per phase, is a 6-pole motor. A three-phase motor with 18 north and 18 south poles, having 6 poles per phase, is also a 6-pole motor. This industry standard method of counting poles results in the same synchronous speed for a given frequency regardless of polarity.
The three-phase induction is now used for the vast majority of commercial applications. [57] [58] Mikhail Dolivo-Dobrovolsky claimed that Tesla's motor was not practical because of two-phase pulsations, which prompted him to persist in his three-phase work. [59] The General Electric Company began developing three-phase induction motors in 1891 ...
Kawak 7.5 kW 208 VAC 400 Hz 3-phase synchronous motor [28] 11.8 kg 26 lb 7.5 kW ... 3.6 hp/lb Electric aircraft: Tesla Model 3 [35] 40.1 kg 88 lb 250 kW
Motor HP Port Ratios Years of Production Sound Output Type Notes Allertor 125 Electro-Mechanical 10, 15 8/12, 9/12, 10/12 (Gen 1) 9/12 (Gen 2 and 3) 1968–1980 Rotating 126 dB at 100 ft. Design changed at least three times throughout production. The most common port ratio is 9/12. The standard Allertor 125 can produce 2 tones.