Tier 1 motor suppliers
Practical engineering support to improve performance, reliability and manufacturability.
SL Propulsion
Engineering support for Tier 1 motor suppliers and developers of EV, eVTOL and electric propulsion systems.
Discuss your project →DEEP EXPERTISE. REAL-WORLD IMPACT. A MORE ELECTRIFIED TOMORROW.Powertrain test bench · supplied photograph
WHO WE WORK WITHDifferent challenges.
Different challenges.
A common drive.
We work with Tier 1 motor suppliers and EV, eVTOL and electric propulsion system developers.
System developers
Technical insight for integrated electric drive systems and new applications.
Research teams
Independent analysis and technical guidance for exploratory and advanced concepts.
Focused expertise. Tangible outcomes.
Motor Control
Machine models and field-oriented control, from simulation to real-time validation.
Models & control algorithms
Performance & efficiency
Motor and inverter loss modeling, efficiency maps and HIL evaluation.
Loss maps & efficiency analysis
Testing & training
Prototype testing, vehicle calibration and practical motor-control training.
Test plans & training
SELECTED PROJECTS
View all projects →Real engineering challenges. Practical insight.
VEHICLE CONTROL
Dynamic Motor Drive
- Challenge
- Improve low-load propulsion efficiency through control software.
- Approach
- Torque modulation while preserving average requested torque.
- Evidence
- Reported 0.6% CLTC range gain; rear axle only, Li Auto L9.
MOTOR CHARACTERIZATION
EESM modeling & testing
- Challenge
- Characterize a production motor without a supplied control model.
- Approach
- Identify nonlinear parameters across rotor excitation settings.
- Evidence
- Efficiency mapping and an offline model, per project record.
Work directly with the engineers.
Dr. Siyu Leng
Technical focus
Motor modeling, power electronics and drive control.
Education & research
Ph.D., Florida State University; postdoctoral research, University of Alberta.
Selected contributions
Electric aviation software, motor drives and vehicle calibration.
Read the biography and supporting APEGA feature.
View full profile →A clear path from challenge to progress.
- 1
Scope the challenge
Understand your goals,
constraints and context. - 2
Agree deliverables
Define the right analyses,
outputs and timeline. - 3
Analyze and review
Apply simulation, calculation
and engineering judgement. - 4
Document next steps
Provide clear findings and
practical recommendations.
INSIGHTSIdeas and analysis for a more
View all insights →Ideas and analysis for a more
electrified future.
TECHNICAL FUNDAMENTALS
From losses to temperature rise
How electrical, magnetic and mechanical losses translate into heat and what it means for thermal design in electric machines.
Read article →
TECHNOLOGY OUTLOOK
Next-generation electric drives
Potential, constraints and engineering trade-offs.
Read article →LET’S TALK
Discuss your project.
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