Experimental E-Bike Platforms
Research, testing, and evolution of combined-winding induction hub motors on light electric transport |
Denzel Sparta — Testing Hub Motors 186 & 318
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Experimental Base
Denzel Sparta became a crucial testing platform after ElMoto for evaluating higher-power induction hub motors and controllers under aggressive acceleration and heavy loads. Detailed documentation began in early 2017. |
First Tests - Airport (21 October 2015)
In October 2015, the size-318 hub motor was mounted. Road tests on October 14 showed exceptional throttle response and dynamic response compared to earlier builds. The 318-size motor was tested at currents up to ~200 A. |
Controllers & Tuning
Curtis 1232E/1232SE controllers were utilized. Controller tuning proved vital for top speed, soft RPM limiting, and preventing system oscillations accompanied by current spikes. |
High-Speed Record
Equipped with the 318-size hub motor, the Sparta platform featured in international exhibitions (including Monaco) and reached speeds of approximately 106 km/h, serving as a flagship show bike. |
Drivetrain Analysis
Hub Motor ? Controller ? Battery ? Current ? Acceleration ? RPM ? Speed
Comprehensive analysis of interconnected drivetrain variables under dynamic stress. |
Project Significance
Demonstrated that effective dynamic performance relies on rapid torque build-up under variable loads rather than rated motor power alone. Formed a cornerstone for ASPP Weihai's larger designs. |
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ElMoto — Early Testing Platform
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Stock ElMoto HR-2
| • Voltage: |
48 V |
| • Battery: |
48V / 31.5 Ah |
| • Power (Nom/Max): |
0.9 kW / 2.0 kW |
| • Stock Speed: |
> 47 km/h |
| • Stock Range: |
up to 65 km |
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Modification (2015–2016)
Fitted with a custom combined-winding induction hub motor, a Curtis 1232E controller (48V / 200A), and a high-discharge Sony VTC4 14S6P battery pack designed to sustain peak currents. |
Test Results
| • WOT Current: |
~ 200 A RMS |
| • Stable Torque: |
94 Nm (up to 650 rpm) |
| • Max Speed: |
~ 101 km/h |
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Range & Efficiency
• @ 25 km/h: ~ 70 km range (8.6 Wh/km)
• @ 30 km/h: ~ 60 km range
• @ 40–50 km/h (+1 °C): ~ 32 km range |
Monaco Debut
In April 2016, the induction hub motor-equipped ElMoto served as one of the first international public demonstrations of the technology at the Monaco Expo. |
Phase Summary
Transitioned a standard low-power commuter bike into a high-torque experimental rig. These tests established the foundation for developing larger-frame induction hub motors. |
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| Sources: Denzel Sparta Test Archives (2017); ElMoto HR-2 Technical Specifications; German Test Documentation (2016); ASPP Weihai International Archive. |
© ASPP Weihai Technology |
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