Pulse counter

摘要

The pulse counter counts high speed pulses and detects an absolute phase difference among a plurality of electric motors.Pulse outputs 5 and 6 from pulse generators 3 and 4 are inputted into integrating counters 15 and 16 through pulse converters 9 and 11 and rotation direction detectors 10 and 12. Integrating counters 15 and 16 count up/dow the pulses in response to the rotation direction. Integrating counters 15 and 16 are cleared with a zero phase pulse output 7, outputted per revolution from the pulse generators 3 and 4. Multipliers 19 and 20 multiply outputs from the integrating counters 15 and 16 by a ratio set by a coefficient unit, and output a signal corresponding to the rotation angle of each electric motor.Adder/subtractor 21 estimates a deviation between the outputs of the multipliers 19 and 20 such that the phase difference between the pulse generators 3 and 4 is estimated.