Jeffrey Ho eCycleElectric Sept. 2010. Taiwanese 20 years LEV related experience including 14 year...
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Jeffrey Ho eCycleElectric Sept. 2010
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Transcript of Jeffrey Ho eCycleElectric Sept. 2010. Taiwanese 20 years LEV related experience including 14 year...
Jeffrey HoeCycleElectric
Sept. 2010
Taiwanese 20 years LEV related experience including
14 year electric motor experience. Managing Director of eCycleElectric
Taiwan Past General Manager of Taiwan DC
Motor. Past VP of Engineering of Ultra Motor.
2Interbike Sep 23, 2010
Weight Size Efficiency Speed Torque Duty cycle Durability Cost
3Interbike Sep 23, 2010
Weight In general, 50W/lb is the technology today at a
reasonable cost 5 lb for 250W motor and 10 lb for 500 W motor
Size Must fit in standard front fork width or possible rear
dropout width Pan Cake motor if put in wheel
Efficiency 80% and up during “cruise” is general industry
standard
4Interbike Sep 23, 2010
Speed Hub motor is relative low speed motor. Bottom bracket
motor speed is OK
Torque in starting/Low speed 30 N-m (max) is minimum requirement 200 lb rider start from 5% slope without pedaling
Duty cycle Variable load condition instead of steady load. 500 hr min, 1000+ hr is not a difficult target today.
Durability Environment requirement (water and temperature)
Cost Range from US$40 for low power (180W) Chinese motor
to US$200 (400W) German motor. 5Interbike Sep 23, 2010
Rated (continuous) power vs. Max. power Both are important Continuous power and maximum torque are more
important
Input power vs. Output power Power requirement
European market: <250W US Market: <750W 200 lb/2 degree (3.5%) climbing ability for 10 minutes,
breezed head wind under 90F: 500W 36V/16A/85+% efficiency=503W
6Interbike Sep 23, 2010
Cost Motor Cost is about the same. But controller cost are different More powerful, more expensive (percentage of diff.)
Efficiency Brushless motor efficiency is higher Brush motor has better chance for higher torque. (with
Lead Acid battery)
Safety Feature Brushless motor has better safety features. When controller MOSFET fail, motor just stops Brushless motor EMC issue in general is less serious.
7Interbike Sep 23, 2010
Number of Motors made per year is relative high now.
Still relative low for traditional motor industry.
Future direction for e-bike motor Improved low speed torque and low speed
efficiency Better reliability but cost will be slightly higher More selection for High power motor for US
market 8Interbike Sep 23, 2010
LEVA Thanks our 2010 Interbike Sponsors!LEVA Thanks our 2010 Interbike Sponsors!
