Fanuc Corporation

Kunio Tsuchida

Taku Sasaki

Nobuo Hirayama

Kiichi Inaba

A switching regulator circuit to convert an inputted first voltage to a second voltage by turning on and off a switching device and to output the second voltage to a load includes: a load current determination unit configured to determine a level of a load current passing the load connected to the switching regulator circuit; a switching frequency setting unit configured to set a switching frequency for the switching device according to a result of determination by the load current determination unit; and a switching control unit configured to turn on and off the switching device at the switching frequency set by the switching frequency setting unit.

Switching regulator circuit to convert input DC voltage to output DC voltage with setting a switching frequency according to load current

A current detection circuit includes: a resistor in a current path; first and second signal transmission units that transmit signals of first and second terminal sides of the resistor; a first difference operation unit that executes a difference operation on the signals transmitted by the first and second signal transmission units; a noise-capturing transmission unit starting point; third and fourth signal transmission units connected with the noise-capturing transmission unit starting point; a second difference operation unit that executes a difference operation on the signals transmitted by the third and fourth signal transmission units; and a summing operation unit that executes a summing operation on the first and second difference signals, wherein the first signal transmission unit and the fourth signal transmission unit are disposed close to each other and the second signal transmission unit and the third signal transmission unit are disposed close to each other.

Current detection circuit not affected by noise

A motor driving apparatus includes an amplifier receiving, from a detector, a sine wave shaped signal detected in response to rotation of a motor, and amplifying the signal with a set amplification factor, an A/D converter for performing digital conversion by sampling the signal amplified by the amplifier at a sampling timing in a predetermined cycle, an amplification factor setting part for changing setting of the amplification factor of the amplifier, and an amplification factor set timing command part for issuing a command with respect to a timing for changing the setting of the amplification factor by the amplification factor setting part. The amplification factor set timing command part issues the command with respect to the timing so that a waveform stabilizing period until distortion in a waveform of the signal occurring when the amplification factor setting part changes the setting is stabilized does not overlap with the sampling timing.

Motor driving apparatus

To provide a motor driving apparatus capable of obtaining high detection resolution irrespective of whether a frequency of a signal from a detector is high or low. A motor driving apparatus for driving a motor includes an amplifier circuit for receiving a signal from a detector for outputting information including a position and a speed of the motor as the signal, and amplifying the received signal with a set amplification factor, a frequency detecting part for detecting a frequency of the signal, and an amplification factor setting part for changing setting of the amplification factor of the amplifier circuit according to the frequency detected by the frequency detecting part.

A machine learning apparatus, which learns a condition associated with a filter unit for filtering an analog input signal, includes a state observer for observing a state variable that includes at least one of a noise component and noise amount of an output signal from the filter unit and a responsivity to the input signal; and a learner for learning the condition associated with the filter unit in accordance with a training data set that includes the state variable.

Machine learning to establish optimal filter for removing external noise without degrading responsivity

A current detection circuit includes a first resistor and a second resistor identical in current path and equal in resistance value, a first and second signal transmission units which transmit respectively a signal representing the potential of the first resistor, a third and fourth signal transmission units which transmit respectively a signal representing the potential of the second resistor, a first difference operation unit which calculates the difference between the respective signals from the first and second signal transmission units, a second difference operation unit which calculates the difference between the respective signals from the third and fourth signal transmission units, and a summing unit which sums the signals output from the first and second difference operation units. The first signal transmission unit and the fourth signal transmission unit, and the second signal transmission unit and the third signal transmission unit are disposed in proximity to each other.

Current detection circuit unaffected by noise

A motor drive device includes an inverter for generating an AC voltage from a DC voltage by switching power elements, a current detection unit for detecting a current to be inputted to a motor, a current controller for generating a voltage command from a current command and a current detection value, a gate drive command generator for generating drive commands for the power elements such that a dead time in an output stage, that is a period of time in which both of the power elements for upper and lower arms that compose the output stage of the inverter are turned off, becomes a predetermined value, a gate drive circuit unit for outputting gate drive signals for the power elements, and a dead time estimator for estimating the dead time in the output stage that is produced by the gate drive signals for the power elements.

Motor drive device having function of estimating dead time in output stage

A detection signal receiving unit receives, via signal lines, a detection signal output from a position detector which is used in a motor control device. The resistance value of a termination resistor unit is changed to a resistance value determined depending on the type of the position detector in accordance with the received detection signal and the reference value determined depending on the type of the position detector.

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Yamanashi, Japan

Kunio Tsuchida