Starter Motor Torque for Electric Motorcycle Propulsion

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SUMMARY

The discussion centers on the expected stall torque of starter motors for electric motorcycle propulsion, specifically comparing a measured torque of 7-9 Nm from a standard starter motor to the required 200 Nm for effective performance. The motor was tested with a 12V battery and a battery booster, indicating significant current draw. The user references performance specifications from Denso starter motors, suggesting that the measured torque may be adequate when factoring in gearing. The importance of gearing in torque output is highlighted as a crucial element in achieving desired performance levels.

PREREQUISITES
  • Understanding of electric motor specifications, particularly stall torque
  • Familiarity with battery systems, specifically 12V configurations
  • Knowledge of gear ratios and their impact on torque multiplication
  • Experience with measuring electrical current and torque in motors
NEXT STEPS
  • Research the specifications of Denso 2.0kW starter motors for electric applications
  • Learn about gear ratio calculations and their effect on torque output
  • Investigate battery booster designs and their efficiency in motor applications
  • Explore electric motorcycle design considerations, focusing on starter motor integration
USEFUL FOR

Electric motorcycle designers, automotive engineers, and hobbyists interested in electric propulsion systems will benefit from this discussion, particularly those exploring starter motor applications and torque requirements.

MechatronO
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What is expected in stall torque from a regular car/small tractor starter motor?

I measured 7-9 Nm on a starter motor I had lying around, and I'm not sure if this motor is crappy or if such performance is expected.
It was fed with 12V battery and parallelled with a battery booster (basically a transformer with 12V ouput). I couldn't measure the current, but the boosters 40A current indicator looked like it was going to hurl its pointer through the glass.

The reason I ask is because if it seems to have a reasonable stall torque it will propel an electric motorcycle.
 
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