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Location: Chennai
Company: Raptee.HV
As a Hardware Engineer, you will own the schematic design, MCU selection, control analysis, and debugging of our PMSM motor controllers. From deriving PI gains mathematically, to designing circuits, to validating MTPA and field-weakening strategies on dyno, your work will directly shape the efficiency, drivability, and reliability of our motorcycles.
This role offers a unique chance to bridge theory and practice — combining advanced control mathematics, hardware design, and real-world validation — with your designs powering vehicles on the road.
Key Responsibilities
- Power Electronics & High-Voltage Hardware
- Design inverter stages, gate driver circuits, protection circuits, and sensing hardware for PMSM controllers.
- Select and validate semiconductors (MOSFETs, IGBTs, drivers, sensors) with attention to thermal and EMI/EMC constraints.
- Support EMI/EMC compliance and reliability engineering.
- Low-Voltage & Schematic-Level Design
- Create schematics for microcontroller circuits, decoupling, RC filters, and signal conditioning.
- Define best practices for analog vs digital ground separation, noise mitigation, and mixed-signal design.
- Provide clean schematic packages for PCB design engineers and review their implementation.
- Control Systems & Plant Modeling
- Develop mathematical plant models of inverter–motor systems using Laplace transforms and transfer functions.
- Perform stability analysis and analytically calculate PI/PID gains before dyno validation.
- Simulate and validate control loops in MATLAB/Simulink.
- Advanced PMSM Control Strategies
- Apply advanced PMSM/IPM control methods such as MTPA, MTPV/field weakening, and deep field weakening.
- Understand differences in strategy between surface PMSM and interior PMSM.
- Implement and validate smooth transitions between torque control, MTPA, and flux-weakening regions.
- Optimise strategies for efficiency, drivability, and thermal limits.
- Hardware Debugging & Validation
- Bring up new boards, validate signals, and debug hardware issues across power and low-voltage domains.
- Diagnose noise, grounding, or signal integrity problems and propose corrective design changes.
- Validate torque output, efficiency, and stability on dyno setups.
- System Architecture & MCU Selection
- Collaborate with software and firmware engineers to select appropriate microcontrollers.
- Define requirements such as clock speed, memory size, ADC resolution, PWM frequency, and peripheral availability.
- Decide pin mapping, communication interfaces (CAN, SPI, I2C, UART), and safety features to support system needs.
- Ensure hardware choices align with control-loop timing and software requirements.
- Vehicle-Level Perspective
- Understand how motor controller design affects regen strategies, drive-cycle energy use, and overall vehicle range.
- Use vehicle-level simulations to align hardware and control choices with efficiency and drivability goals.
- Collaboration & Documentation
- Work closely with firmware/software engineers for integrated development.
- Document schematics, component justifications, control analysis, debugging results, and validation procedures.
What We’re Looking For:
- B.E./B.Tech or M.E./M.Tech in Electrical, Electronics, Power Electronics, or Control Systems Engineering.
- Strong knowledge of PMSM/IPM motor controller hardware (inverters, gate drivers, sensing, protection).
- Deep understanding of control theory: Laplace transforms, transfer functions, Bode/Nyquist stability, PI/PID tuning.
- Practical expertise in advanced PMSM control strategies (MTPA, MTPV, flux weakening, deep field weakening).
- Experience in schematic-level design of both power and low-voltage circuits.
- Hands-on experience in hardware debugging and board bring-up.
- Familiarity with MATLAB/Simulink for plant modeling, control simulation, and vehicle-level analysis.
- Experience validating controllers on dyno setups.
- Ability to collaborate on microcontroller selection and requirements definition with software teams.
Nice-to-Have
- Experience with automotive standards (ISO 26262, EMI/EMC).
- Exposure to state-space or observer-based control methods.
- Knowledge of thermal design and reliability analysis.
- Experience with HIL testing or rapid prototyping.
