Ais 041(rev.1)

Electric Motor standard for electric vehicles

1. Scope Test Conditions Test Procedure Bench Dynamometer Chassis Dynamometer Data to be recorded Accuracy of Measurement Determination of Net power Determination of 30 minutes power Test Results AIS- 041 Rev. 1

2. Representation of the curve as a function of motor speed and the power at full load indicated by the vehicle/motor manufacturer for motors of the electrical drive trains. Also the maximum 30 minutes power of the electric drive trains intended for propulsion for L, M and N categories of the Electric Power train Vehicle is recorded. Scope

3. The test for motor power may be conducted by testing the motor using a bench dynamometer or by testing the vehicle using a chassis dynamometer as per manufacturer’s option. If power measurement has been carried out on the motor alone with gear box or a reducer mounted, then efficiency has to be taken into account. Test Conditions

4. Bench Dynamometer Procedure Auxiliaries Test Procedure No. Auxiliaries Fitted for net power and maximum 30 minutes power test 1 DC Voltage Source Voltage drop during test < 5% 2 Speed Variator and control device Yes: Standard Production equipment 3 Liquid cooling ►Motor bonnet ► Bonnet outlet No 4 ►Radiator ►Fan ►Fan cowl ►Pump ►Thermostat Yes: Standard production equipment 5 ►Air Cooling ►Air Filter ►Cowl Blower ►Temperature adjustment system Yes: Standard production equipment 6 Electric equipment Yes: Standard production equipment 7 Bench test auxiliary fan Yes, If Necessary

5. The radiator, fan, fan cowl, water pump and thermostat shall be located on the test bench in the same relative position as on the vehicle. The cooling-liquid circulation shall be activated by the motor liquid pump only The power absorbed by fan with radiator and cowl (if used), shall be determined at the speeds used for measurement of motor power either by calculation from the standard characteristics or by practical tests. All auxiliaries (like air conditioning systems, power steering compressor etc.) shall be removed when performing the test. Where auxiliaries cannot be removes, the power they absorb in the unloaded condition may be determined and added to the measured power. Test Procedure

6. Chassis Dynamometer Procedure While testing on chassis dynamometer, it should be adjusted for cancelling the friction losses from the running vehicle other than the electric power train and installed accessories. The power supply may be from REESS of the vehicle with voltage within the specified limits. If the power supply is from REESS, it shall be charged according to normal procedure for a period not exceeding 12 hour. Test Procedure

7. The net power determined from the test shall be carried out with speed control setting at maximum position with full setting of the power controller Torque and speed data to be recorded simultaneously If cooling liquid is used the temperature recorded should be maintained at ±5°C of the thermostat setting specified by the manufacturer. If cooling liquid is used the temperature recorded should be maintained at ±5°C of the thermostat setting specified by the manufacturer . If air cooling is used, the maximum temperature maintained should be ±20°C of the maximum valuye supplied by the manufacturer Data to be recorded

8. Accuracy of measurements Parameter Accuracy Remarks Torque ±1% of the measured torque Measurement system must be calibrated to take frictional losses into account Speed 0.5% of the measured speed Air inlet Temperature ± 2°C Vehicle Speed ± 1 kmph

9. Determination of Net Power The motor/vehicle and all its equipment assembly must be at temperature 25°C± 5°C for a min of 2 hours before the start of test Net power test shall consist of a run at full setting of the power controller Just before the beginning of test, the vehicle/motor shall be run on the chassis/bench dynamometer for 3 minutes delivering 80% of the maximum rated power at speed recommended by the manufacturer. Measurement should be done on at least four speeds to correctly define the power curve between the minimum and maximum speeds recommended by the manufacturer Whole test should be completed in 5 minutes.

10. Determination of 30 min power The motor/vehicle and all its equipment assembly must be at temperature 25°C± 5°C for a min of 4 hours before the start of test The vehicle/motor shall be run on the chassis/bench dynamometer for maximum 30 minutes which is declared by manufacturer Speed is recommended to be in range at which net power is greater than 90% of the maximum power measured in the previous section. The power must be in the range of ±5% of the power value at the start of test. 30 minutes power is the average power within 30 minutes period.

11. Test Result The net power and the maximum 30 minutes power should not differ by ±2% for maximum power and more than ±4% at other measurement points on the curve Tolerance of ± 1kmph for vehicle speed/ ±2% of the motor speed