Establishment of standard device for high rotational speed generation

The high rotational speed standard device based on brushless DC coreless micro motor and FPGA technology for highaccuracy rotational speed control was investigated and established, with resolution of 1 r/min in the measurement range of 40000 r/min to 100000 r/min. The expanded calibration uncertainty of this standard device is 1×10-5, k=3 The structure of the device and key technology involved were described．The dual closed-loop control solution was explained. The calibration results were provided．This high rotational speed standard device is used as an important working standard for the feasible traceability of high-precision optical tachometers and rotational speed measuring instruments at measurement range above 40000 r/min.