ISO 21782-1:2023

Overview

ISO 21782-1:2023 - Electrically propelled road vehicles - Test specification for electric propulsion components - Part 1 defines the general test conditions and definitions used across the ISO 21782 series. It specifies standardized test procedures and terminology for voltage class B electric propulsion components: motor, inverter, DC/DC converter, and their combinations (the motor system). The standard enables reproducible, comparable performance and operating-load testing for electrically propelled road vehicles.

Key topics and technical requirements

• Scope & terminology: clear definitions for components and test-relevant terms (e.g., chopper, DC/DC converter, conversion rate, efficiency, maximum current/power/torque for specified durations).
• General test conditions:
  • Operating points for motor, inverter and motor system (defined in figures and tables). Test durations t include 2 s, 10 s, 1 800 s (30 s or 60 s optional).
  • Methods for determining rank during operating-load tests: target rank verification and rank search methods.
  • Provision for measurement: requirements for current, voltage and power measurement and measurement accuracy.
  • DC input voltage ranges and considerations (aligned with voltage class B definitions and OS1 references).
  • Environmental conditions: temperature and humidity control and steady-state (room temperature) starting conditions.
• Abbreviations & references: standardized shorthand (AC, DC, PWM, RT, DUT) and links to ISO/IEC terminology resources.
• Informative annexes: example formulas for power calculation and a bibliography supporting the series.

Practical applications

• Standardized lab test protocols for component performance characterization (efficiency, loss, torque/speed behavior).
• Operating-load and endurance testing to assess durability and thermal limits (e.g., maximum current/power for defined durations).
• Component and system validation during R&D, prototype evaluation, and pre-qualification for production.
• Supplier comparison and procurement specification: enabling fair, reproducible comparisons of motor systems and converters.
• Test-bench and regulatory test program development for electric vehicle (EV) propulsion components.

Who uses ISO 21782-1

• Automotive OEMs and EV powertrain engineers
• Motor, inverter and DC/DC converter manufacturers and suppliers
• Independent test laboratories and certification bodies
• R&D teams working on electric propulsion performance and reliability
• Quality assurance and procurement teams evaluating component suppliers

Related standards

• Other parts of the ISO 21782 series (Parts 2–7) - detailed performance and operating-load tests for motor, inverter and DC/DC converter.
• ISO 21498-1 (OS1 voltage definitions) and IEC terminology references (IEC Electropedia, IEC 60050).

Keywords: ISO 21782-1, electric propulsion components, electric vehicle testing, motor system test specification, inverter testing, DC/DC converter, operating load test, EV component standards.