Motor timing advance

Simon

http://www.castlecreations.com/support/max_tuning_guide.html
原來係咁timing advance會令摩打過熱, 要快, 應用齒比配合直路最終車速.

Simon

唔明唔明.
乜唔係用個Kv值乘V=nominal rpm
再用rpm乘gear ratio= max road speed
如果個rpm唔係過高就唔會有overheat問題?
等我計計先
4370Kv x 7.2V = 31464rpm
摩打gear ratio 61/19 = 3.21
尾牙gear ratio 39/15 = 2.6
Total gear ratio = 8.346
tyre diameter 65mm, 圓周= 204.1mm
當1分鐘摩打轉31464rpm, 轆轉31464/8.346=3770圈, 即係769.4m
行60分鐘就46164m, 即係我架TT01E極速係   46.2km/hr   

Simon

http://homepage.mac.com/kmyersefo/timing/timing.htm
timing 一述.

Simon

我個Leopard 4370 Kv屬2 pole inrunner brushless設計. 唔知advance到幾多係最理想呢?
http://www.leopardhobby.com/prod ... functionID=01020807

Simon

Many brushless ESC allow the user to set the Electronic Advance Timing.
High advance timing (hard timing) is suitable for high pole count motors (above 6
poles, such as Jeti, Mega, Plettenberg).

High advance timing gives more output power at expense of efficiency.
Low advance timing (soft timing) is suitable for low pole count motors. It gives
higher efficiency with some loss of output power and is recommended when long
run-time is the primary goal.

A recent type of brushless motor is the so-called "outrunner".
These motors have the rotor "outside" as part of a rotating outer case while the stator is
located inside the rotor.

This arrangement gives much higher torque than the conventional brushless motors, which
means that the "outrunners" are able to drive larger and more efficient propellers without the need of gearboxes.

Simon

In general:
More timing - More rpms, less torque.
Less timing - Less rpms, more torque.