On 18/03/2024 11:30, 'Geoff Olsen' via TramsDownUnder wrote:
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> To answer another of Mick’s questions DC  electronic drives, regardless of the technology used, eliminate the need for any form of transition steps. The motors are usually permanently connected in parallel.

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I think that PCC cars all used 300V DC motors permanently coupled in series pairs - and no series/parallel switching.  MMTB wiring diagram attached.

The modern adoption of AC induction motors with no commutator and where speed is controlled by frequency enables motors to be waterproof, as in the Skoda motors that will be in the Melbourne G class trams.

See: https://tdu.to/m/288585

Mal Rowe in a city buying from the Czech Republic!