Toshiba Kikai Kabushiki Kaisha

Shibaura Machine Co., Ltd.

Takamichi Ito

Jun Fujita

Atsushi Tada

Ryuji Aono

Hirohiko Matsuzaki

Takeshi Iida

Naomi Kobayashi

Kazuhiro Katsumata

An industrial machinery includes: a drive mechanism driving a control target that moves work or a tool; a motor; a first sensor detecting a position of the control target; a second sensor detecting a position of the motor; a current controller controlling a supply current to the motor; a servo controller outputting a torque instruction to the current controller; and a numerical controller calculating a processing force of the control target to the work based on position information on the control target acquired from the first sensor, position information on the motor acquired from the second sensor, and the torque instruction, the numerical controller determining that the tool is in failure if an absolute value of a first component of the processing force becomes equal to or larger than a first threshold value while processing the work, the first component having a frequency lower than a predetermined frequency.

Industrial machinery and control method thereof

An electric machine according to the embodiment includes: a motor; a current controller supplying a current to the motor; a detector detecting a position, a speed, or an acceleration of a shaft of the motor; a controller calculating a torque parameter indicating a torque of the motor based on a current instruction that specifies a supply current to the motor and calculating a speed parameter indicating a rotational speed of the shaft of the motor based on a detection result from the detector; and a display part displaying a graph showing a relation between the torque parameter and the speed parameter.

Electric machine and display method

A method for controlling temperature rise in divided heating zones of a barrel of a molding machine includes: setting tentative target temperatures for the respective heating zones; simultaneously raising temperatures in the heating zones to the set tentative target temperatures; when temperatures in the heating zones reach the respective tentative target temperatures, selecting a master zone from the heating zones, and selecting, as a slave zone, a heating zone which is other than the master zone among the heating zones; and after temperatures in the heating zones reach the respective tentative temperatures, raising the temperatures in the master zone and the slave zone to respective final target temperatures according to an attainment degree of temperature rise in the master zone.

Automatic temperature rise control method for molding machine

A method of controlling a current by supplying a d-axis current in order to prevent a voltage saturation includes: defining an amount of the d-axis current as Id=|Idmax|&#xb7;sin &#x3b8;; continuously comparing a voltage command value with the voltage command value threshold Vo in a predetermined cycle; extracting a predetermined number No of latest comparison results in terms of time; setting a phase angle &#x3b8; to be 0&#xb0; when a number N of the comparison results out of the predetermined number No of the comparison results is equal to or less than an integer Nb; and increasing the phase angle &#x3b8; depending on largeness of the number N when the number N is more than the integer Nb.

Servomotor current control method and servomotor

A driving velocity of a motor is detected by processing a position information signal output from a sensor in accordance with a driving position of a motor. The signal processing device includes a position information signal processor () that processes the position information signal and calculates driving velocity information of the motor, and an internal position information generator () that reflects a latest driving velocity information (&#x3c9;) calculated by the position information signal processor () and generates a latest presumed position of the motor as internal position information. An amplitude correcting unit () detects the amplitude of the position information signal from the sensor and corrects the amplitude of the internal position information signal based on the detected amplitude.

Signal processing device, velocity detecting device and servo mechanism

Under a low load condition, a produced torque is small and a synthetic current command I* with respect to an armature of a servomotor is small so that a magnitude in a negative direction of a reactive current command Id* determined by Id*=&#x2212;|I*|&#xb7;sin &#x3b8; is small. As a result, under the low load condition, the synthetic current flowing through the armature can be small, and generation of wasteful heat can be suppressed. Further, under a high load condition, because a q-axis current Iq that produces the torque is large, voltage saturation is liable to occur. However, at the same time, the overall current command I* is large under the high load condition, and Id* is large in the negative direction. Therefore, a large reactive current Id can be flowed in the negative direction, and voltage saturation under the high load condition can be effectively prevented.

A servo control device includes a current supply unit for supplying a drive unit with a drive current for driving a target to be controlled; a first detector for detecting at least the drive current value; and a logical arithmetic section which introduces a current command determining the drive current for controlling the drive speed of the drive unit to move the target to be controlled to a predetermined position, and which introduces the drive current value fed back from the first detector. The logical arithmetic section outputs the current command to the current supply unit after correcting the current command by a digital logic process on the basis of the drive current value.

Servo control device

A signal processing device processes a position information signal (A sin&#x3b8;, A cos&#x3b8;) output from a sensor in accordance with a driving position of a motor and detects a driving speed of the motor. The signal processing device includes a position information signal processor () that processes the position information signal and calculates driving speed information of the motor, and an internal position information generator () that reflects a latest driving speed information (&#x3c9;) calculated by the position information signal processor () and generates a latest presumed position of the motor as internal position information. The position information signal processor () calculates driving speed information (&#x3c9;) of the motor based on a difference between the position information signal (A sin&#x3b8;, A cos&#x3b8;) from the sensor and the internal position information (A sin&#x3b8;, A cos&#x3b8;) generated by the internal position information generator ().

Signal processing device, signal processing method, signal processing program, recording medium storing the program, speed detector and servomechanism

A servo control device comprises a current supply unit for supplying a drive unit with a drive current for driving a target to be controlled, a first detector for detecting at least the drive current value, and a logical arithmetic section. The logical arithmetic section introduces a current command determining the drive current for controlling the drive speed of the drive unit to move the target to a predetermined position, and introduces the drive current value fed back from the first detector. The logical arithmetic section outputs the current command to the current supply unit after converting the current command by a digital logic process on the basis of the drive current value by using a custom LSI.

Automatic speed loop gain adjustment of a feedback control system begins by setting up a phase margin range and a gain margin range. A speed open loop condition is provided by separating a speed command value from a speed feedback value. White noise is input into the feedback control system where the speed open loop condition has been made. A phase margin and a gain margin are then detected and comparisons are made with the phase margin range and the gain margin range, respectively. The speed loop gain is adjusted if the comparison results for either one of the detected phase margin and the detected gain margin fall outside of the associated phase margin range or gain margin range. Once the adjustment of the speed loop gain is complete, the position loop gain of the position control loop is adjusted on the basis of the adjusted speed loop gain.

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Numazu, Japan

Takamichi Ito