Rotational speed calibration?equipment with variable frequency speed governing(VFSG) function

The utility model relates to a calibration?equipment of the tachometry instrument of the large -scale favourable turn equipment of chemical industry and electric power enterprise, concretely relates to rotational speed calibration?equipment with variable frequency speed governing(VFSG) function, including power, signal generator, converter, motor, speed?sensor, sensor fixed support, preamplifier and rotational speed instrument, for the converter power supply behind the power process signal generator, the gear is installed to the rotational speed of converter control motor on the rotor of motor, sensor fixed support sets up under the gear, sets up the mounting hole that a plurality of is used for fixed speed?sensor on the support, speed?sensor passes through preamplifier and rotational speed instrument connecting. The utility model provides it is high to required speed?detection instrument measuring accuracy of large -scale favourable turn equipment and security, provide the guarantee for the long period run o