If the wheel diameter, gear ratio and speed of the vehicle are all halved. What will be
its effect on the rpm of the electric motor?
Answers
Explanation:
Gears allow the speed and output power of a motor to be changed. By reducing the speed of the output, the torque (amount of turning power) of the output gearin increases. The reverse also applies.
On a bicycle, a low gear ratio (i.e. a small gear on the pedals driving a larger gear on the rear wheel) helps when climbing hills - the cyclist has to pedal more times to get up the hill distance, but each cycle of the pedals takes less effort.
Simple gear chains
With single gears, gear ratios are simple mathematics. If gear A has 20 teeth, and B has 80, we express this as…
Gear ratio = 80:20 = 8:2 = 4:1
This tells us that gear A will to revolve 4 times for each full revolution of gear B. If gear A was connected to a motor which spins at 1000rpm (Revolutions Per Minute), gear B would spin at 250rpm.