摘要:
Provided is a motor control device which realizes automatic adjustment of control of a motor for driving a mechanical load through a simple operation. The motor control device includes: a follow-up control unit (6) for receiving detection information of a detector (3) to output a torque command signal and output a status of motor control of a motor (1) as a control status amount signal, when a command signal regarding the motor control to be output from an upper-level controller is absent; an oscillation detection unit (9) for receiving the control status amount signal and detecting oscillation of a control status amount to output an oscillation detection signal; and an automatic adjustment unit (10) for receiving the oscillation detection signal to monitor a control status of the motor (1) and adjust a control parameter of the follow-up control unit (6) only when abnormality is detected.
摘要:
Provided is a motor control device which realizes automatic adjustment of control of a motor for driving a mechanical load through a simple operation. The motor control device includes: a follow-up control unit (6) for receiving detection information of a detector (3) to output a torque command signal and output a status of motor control of a motor (1) as a control status amount signal, when a command signal regarding the motor control to be output from an upper-level controller is absent; an oscillation detection unit (9) for receiving the control status amount signal and detecting oscillation of a control status amount to output an oscillation detection signal; and an automatic adjustment unit (10) for receiving the oscillation detection signal to monitor a control status of the motor (1) and adjust a control parameter of the follow-up control unit (6) only when abnormality is detected.
摘要:
This invention discloses an oxide superconductor shaped body including a noble metal layer formed on at least one surface of an oxide superconductor layer formed on a substrate, and a method of manufacturing oxide superconductor shaped body.
摘要:
To reduce the load of a communication process performed between pseudo base stations of different communication standards. An LTE pseudo base station unit 3 includes: an LTE message processing unit 3b that transmits broadcast information including base station information about a C2K pseudo base station unit 4 to a mobile communication terminal 10, which is a test target, extracts location registration request message information from data when receiving the data including the location registration request message information as response message information to the transmitted broadcast information, and outputs the location registration request message information; and a specific C2K message processing unit 3c that outputs the location registration request message information as response message information when receiving the location registration request message information from the LTE message processing unit 3b.
摘要:
Provided is a lead-based alloy for a lead-acid battery, comprising not less than 0.02% and less than 0.05% by weight of calcium, not less than 0.4% and not more than 4.0% by weight of tin, not less than 0.005% and not less than 0.002% and not more than 0.014% by weight of barium, and the balance of lead and unavoidable impurities.
摘要:
The present invention provides inexpensive electric contact materials having higher hardness and higher melting point and being more excellent in the points of wear resistance and environmental resistance over the electric contact materials of Ag type, Au type, platinum group type, etc. having been used so far, production methods thereof and electric contacts used said contact materials.In the electric contact materials of the invention, basically, a covering layer having at least one selected from transition metals of groups IVa (Ti, Zr, Hf, etc.), Va (V, Nb, Ta, etc.) and VIa (Cr, Mo, W, etc.) as a major ingredient is formed on the substrate as an electric contact in a thickness of 0.03 to 100 .mu.m, and, if need be, a fixed intermediate layer is formed between said covering layer of electric contact and substrate or a fixed surface layer is formed on the outside of covering layer of electric contact, thus aiming at further improvement in the characteristics of contact.Such covering layer of electric contact can be formed by chemical vaporization or physical vaporization such as plasma CVD, sputtering, ion assist vaporization, ion plating, laser beam sputtering or the like and, by making the conditions of these vaporizations appropriate, it is possible to produce the electric contact materials having excellent characteristics of contact.
摘要:
A method of manufacturing a lead or a lead alloy plate lattice for a lead-acid battery, featured in that a melt of lead or a lead alloy is continuously extruded under temperatures lower by 10 to 100° C. than the melting point of the lead or the lead alloy, followed by subjecting the extrudate to cold rolling under temperatures lower by 50 to 230° C. than the melting point of the lead or the lead alloy with the total draft rate set at 10 to 90% and subsequently cooling and processing the cold rolled extrudate so as to manufacture a plate lattice.
摘要:
There is provided a controlling device for an AC motor having a structure in which a current of a three phase brushless DC motor is detected and then converted to a rotor coordinate system, to separately control a torque split current (q axis) and an exciting split current (d axis), wherein an offset is estimated with a DC component of a multiplied value of the values corresponding to a d axis voltage command which is an output of an exciting split current controller and an electrical angle, and the detected current is compensated for, so that an offset of a current detector may be estimated and compensated for during its operation without stopping its rotation and the motor can rotate smoothly without a torque ripple, even in the case in which the current detector has an offset error or in the case in which an offset changes due to a temperature drift.
摘要:
A heat exchanger tube for effecting a heat exchange between a fluid inside the heat exchanger tube and another fluid flowing outside the heat exchanger tube, which is provided with a first kind of spiral grooves and a second kind of spiral grooves, each being formed on an outer surface of the heat exchanger tube. The twisting direction of the first kind of spiral grooves in relative to the axis of the heat exchanger tube is the same as that of the second kind of spiral grooves but differs in helix angle from each other with helix angles of the first kind of spiral grooves and the second kind of spiral grooves falling within the range of 3.degree. to 80.degree. in relative to the axis of the heat exchanger tube.
摘要:
In an encapsulated contact material which varies little in contact resistance and has good working life performance, at least one contact coating layer is formed covering the surface of a contact substrate. The contact coating layer includes a substantial matrix formed of at least one element selected from a group including Mo, Zr, Nb, Hf, Ta, and W, the matrix being loaded with 0.5 to 50 atom % of at least one element selected from a group including Zn, Cd, Hg, Al, Ga, In, Tl, Ge, Sn, Pb, As, Sb, and Bi. The contact coating layer has a thickness of 0.1 .mu.m or more.