A graph of speed on the x axis and torque on the y axis. The line shows that torque is proportionate to 1/speed

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   Garry Keenor (25kv@mas.to)'s status on Monday, 22-Jan-2024 02:07:23 JST Garry Keenor

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   So you’re a late Victorian engineer working out how to configure your electric tram. The first thing you need to do is to pick a motor to use in your rail vehicle. In the 1890s, this meant the Series DC motor. This motor was well-understood, easy to build and crucially, had the right speed-torque characteristic for its purpose: high torque from standstill, dropping away as speed builds up.