ISO 21782-6:2019

Overview

ISO 21782-6:2019 - "Electrically propelled road vehicles - Test specification for electric propulsion components - Part 6: Operating load testing of motor and inverter" specifies operating-load tests and acceptance criteria for motors and inverters designed as a voltage class B electric propulsion system for electrically propelled road vehicles. The standard defines endurance and verification tests that evaluate mechanical and electrical robustness under repeated high-load and transient conditions, and it links to general definitions and test conditions in ISO 21782-1:2019.

Key topics and technical requirements

• Scope and linkage

  • Applies to motor and inverter components of voltage class B propulsion systems.
  • Normative references include ISO 21782-1 for general test conditions and definitions.

• Motor operation endurance tests

  • High acceleration/deceleration endurance test: evaluates fatigue on bearings, end rings, shaft key, rotor fixture, rotor, and position sensor by repeating intermittent maximum speed cycles. Cycle counts are ranked (C → S) - e.g., C = 100 000 cycles (bidirectional), S = 500 000 (bidirectional); single-direction rankings are higher (C = 200 000, S = 1 000 000). Pre/post-energizing measurements and optional disassembly criteria (back-EMF ±5%, position sensor ±5° electrical, torque ±5%) are specified.
  • Maximum torque endurance test: stresses components under intermittent maximum torque at constant speed. Ranks and cycle counts are provided (C = 300 000 up to S = 2 000 000). Temperature control to saturation during permissible continuous load is required.

• Inverter operation endurance tests

  • Cyclic test: verifies inverter endurance under repeated load transients (details and test parameters defined in the standard).

• Rotor breakdown strength verification

  • Spin test and other verification methods to confirm rotor mechanical integrity.

• Measurements & acceptance criteria

  • Key measurable criteria include back-EMF, torque–speed characteristics, position sensor waveform, vibration, and post-test physical inspection (bearings, end ring, shaft key, rotor, adhesives).

• Test reporting

  • Test report contents and an informative annex template are included.

Practical applications and users

• Who uses it: OEMs, propulsion component suppliers, independent test laboratories, validation and reliability engineers, and procurement teams specifying component durability.
• Typical uses: component qualification, supplier benchmarking, durability ranking, validation during design iteration, and contractual verification for motor and inverter acceptance.

Related standards

• ISO 21782-1:2019 - General test conditions and definitions for testing electric propulsion components (normative reference).
• Other parts of the ISO 21782 series address complementary test specifications for propulsion components.

Keywords: ISO 21782-6:2019, electrically propelled road vehicles, motor/inverter testing, operating load testing, endurance test, high acceleration test, maximum torque endurance, spin test, voltage class B.