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BS ISO 8856:2014 pdf free

BS ISO 8856:2014 pdf free.Road vehicles一Electrical performance of starter motors一Test methods and general requirements
Test method A or B shall be used. Method C can also be used in addition, if required.
If it is important to know the starter motor performance at a temperature of -25℃, this can be measured according to 5.2.3 or it can be calculated by using the values measured in accordance with 5.2.1 or 5.2.2 and the calculation methods described in Clause 6.
If required, temperatures different from -25℃ can be considered as agreed between the starter motor manufacturer and the engine manufacturer.
Energize the starter motor and allow it to reach the starting rotational frequency for the test, e.g. near to the no load rotational frequency. Using the brake or variable load, decrease the rotational frequency at a constant rate while torque, current, voltage, and rotational frequency are automatically recorded. The test is finished when a minimum armature speed is reached. This speed is defined by the starter motor manufacturer to avoid damage to the starter motor.The total test time shall be≤10 s.
Run the starter motor at discrete torque load, rotational frequency, or current points and record the torque, current, voltage, and rotational frequency at each of these discrete points. The number of points will be determined by the purpose of the test.The time for each discrete point measurement shallbe≤3 s.After each measurement point, cool all parts of the starter motor to the test temperature (see 3.1.1).
Precondition the starter motor at cold cranking temperature and test it according to 5.2.1. The test shall be completed within 3 min of the starter motor being removed from the preconditioning environment.The total test time shall be≤10 s.
The measured values of torque and rotational frequency shall be corrected taking into account the influence of the test bench, inertia, and temperature. The calculations described below are applicable to both permanent magnet starter motors and electrically excited starter motors.
Torque is measured either directly as the reaction torque of the starter motor, or at the drive gear shaft.If torque is measured directly, the corrections given in 6.2.3 and 6.2.4 apply. If torque is measured at the drive gear shaft, the corrections given in 6.2.2 to 6.2.4 apply.BS ISO 8856 pdf download.

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