Abstract: The present invention relates to a detecting device of rotational position deviation, which detects deviation of the rotational position of machine axes driven by electric motors with pulse signals outputted from pulse generators, which are attached to at least two electric motors. One or more deceleration mechanisms are provided between an electric motor and a machine axis connected to the electric motor. A pulse transducer transforms two pulse trains outputted from the pulse generators to one pulse train, and an integrating counter counts the pulse train which is outputted from the pulse transducer, thus corresponding to the rotation angle. A zero phase pulse is outputted by each rotation of the pulse generator. The invention further comprises a count transducer transforming the count output from the integrating counter, and a calculator of rotational position counter calculating the output of the integrating counter and the count transducer and outputting rotational position errors.

Abstract: A synchronous control device according to the present invention completes an origin matching between a master section and a slave section without causing a phase difference even when a deceleration device is employed in the master section or in the slave section so as to perform an accurate synchronous control. The synchronous control device constantly detects the phase of a shaft of a master electric motor by a phase detector of the master electric motor according to the outputs of a master rotary encoder, and the phase of a shaft of the master machine by a phase detector of the shaft of the master machine according to the outputs of a master rotary encoder and an origin detector of the shaft of the master machine.

Abstract: A synchronization control device and a synchronization control method are provided in which it includes controllers Am and As1 of a master section and a slave section for accurately synchronizing rotational frequency and rotation phases of driving electric motors Mm and Ms1. The controller As1 includes rotational frequency detectors Ss1, Fs1, a master phase counter Cm1, and a slave phase counter Cs1, and detects at all times both of a rotational frequency and a rotation phase of the electric motors Mm of the master based upon an output of the rotary encoder Pm, and further detects at all times both of a rotational frequency and a rotation phase of the electric motor Ms1 of the slave.

Abstract: An object of the present invention is realizing a highly accurate synchronous control device which does not cause time lag by detecting the rotational frequency and phase simultaneously perpetually by same signal in the synchronous control of plural electric motors. The synchronous control device synchronizes accurately rotational frequency and rotation phase of an electric motor or a machine axis driven by the electric motor. A master section outputs phase signals or frequency signals based on rotational frequency reference.

Abstract: 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.

Abstract: A synchronization control device and a synchronization control method are provided in which it includes controllers Am and As1 of a master section and a slave section for accurately synchronizing rotational frequency and rotation phases of driving electric motors Mm and Ms1. The controller As1 includes rotational frequency detectors Ss1, Fs1, a master phase counter Cm1, and a slave phase counter Cs1, and detects at all times both of a rotational frequency and a rotation phase of the electric motors Mm of the master based upon an output of the rotary encoder Pm, and further detects at all times both of a rotational frequency and a rotation phase of the electric motor Ms1 of the slave.