Page 159 - Automotive Engineering Powertrain Chassis System and Vehicle Body

CH AP TER 6 .1 Battery/fuel-cell EV design packages

Fig. 6.1-16 AC drive systems: (a) transaxle motor; (b) controller arrangement; (c) controller drive system; (d) 3 phase induction motor
stator; (e) air-gap type reluctance motor; (f) induction motor controller.

number of poles p. Rotor current frequency f r ¼ sf p construction and, when used with power transistors, can
where s is the slip. Power supplied to a 3 phase motor can be applied as a variable speed drive. Axial air-gap versions
be expressed as EI(3) 1/2 f s n where n is efficiency. When are possible as at (e); such an electronically commutated
a synchronous motor has no exciting voltage on the rotor motor can operate with a DC source by periodic reversal
it is termed a ‘reluctance’ motor which has very simple of the rotor polarities.

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