Ebike maximum speed from motor rpm

Description

J E Patterson - jepspectro.com - version 20160210

Enter motor rpm
Enter wheel size in inches or mm
Press GSB A.

The maximum speed at 36 volts is displayed.
Press R/S.
The maximum speed at 42 volts is displayed.

speed km/h = 4.79E-3 x motor rpm x wheel size at 42 volts
25.4 x pi x 60 / E^6 = 4.79E-3.
At 36 volts speed = speed at 42 volts * 36/42

Speed is proportional to the battery voltage and the wheel diameter.
Speed is limited by hills and wind.
For a 20 inch wheel the bike speed in km/h at 42 volts is approximately motor rpm/10.

Program Resources

Labels

Name Description
 A Enter bike rpm

Storage Registers

Name Description
 1 Maximum speed km/h at 42 volts
 2 Maximum speed km/h at 36 volts
 3 25.4
 4 Wheel size in inches

Program

Line Display Key Sequence Line Display Key Sequence
000 019 7 7
001 42,21,11 f LBL A 020 9 9
002 2 2 021 26 EEX
003 5 5 022 16 CHS
004 48 . 023 3 3
005 4 4 024 20 ×
006 44 3 STO 3 025 45,20, 4 RCL × 4
007 33 R⬇ 026 44 1 STO 1
008 2 2 027 48 .
009 0 0 028 8 8
010 0 0 029 5 5
011 34 x↔y 030 7 7
012 43,30, 7 g TEST x>y 031 20 ×
013 45,10, 3 RCL ÷ 3 032 44 2 STO 2
014 44 4 STO 4 033 45 2 RCL 2
015 33 R⬇ 034 31 R/S
016 33 R⬇ 035 45 1 RCL 1
017 4 4 036 43 32 g RTN
018 48 .