The analogy is a development of transport motors.
Once upon a time we had horses mules and oxen to power our carraiges and machines. One gear, good torque, easy controls. But high maintenance.
Then steam power. Not very efficient, especially at smaller sizes. Excellent low speed torque, but generally large plant, and for powering machines we had step belt drives to vary speed and have low speed torque and high speed for smaller diameters. Locomotives had single speed direct drive.
Along came electric motors. For smaller applications and transport like trams and locos we stepped the voltage to vary motor speed to optimise torque and speed.
Along came Infernal Combustion Engines. While some had automatic (stepped gearbox).transmissions and hydraulic torque converters, others had manual step gear changes. Machines also want down the route of gears with stepped torque-speed variation., using a constant speed electric motor.
But now transport is returning to battery electric, using clever electronics to give "seamless" variable speed optimising the motor to speed required. And machines are doing the same.
What goes around comes around, with th nice advancement.
K2
Once upon a time we had horses mules and oxen to power our carraiges and machines. One gear, good torque, easy controls. But high maintenance.
Then steam power. Not very efficient, especially at smaller sizes. Excellent low speed torque, but generally large plant, and for powering machines we had step belt drives to vary speed and have low speed torque and high speed for smaller diameters. Locomotives had single speed direct drive.
Along came electric motors. For smaller applications and transport like trams and locos we stepped the voltage to vary motor speed to optimise torque and speed.
Along came Infernal Combustion Engines. While some had automatic (stepped gearbox).transmissions and hydraulic torque converters, others had manual step gear changes. Machines also want down the route of gears with stepped torque-speed variation., using a constant speed electric motor.
But now transport is returning to battery electric, using clever electronics to give "seamless" variable speed optimising the motor to speed required. And machines are doing the same.
What goes around comes around, with th nice advancement.
K2