摘要:
A motor drive unit used in controlling an AC motor which drives the spindle or feed shaft of a machine tool is suitable for automatic assembly in which a plurality of electrical components are mounted and wired. In accordance with the motor drive unit of the invention, an upper frame (2) supporting a printed circuit board (1) having electrical circuitry which employs control semiconductors, and a lower frame (4) for mounting a heat radiating device (5), which mounts a rectifier or the like, as well as a power resistor (6), are constructed of synthetic resin. A power board (3) on which power circuit components are connected by soldering is sandwiched between the two frames (2), (4) and has the components on the heat radiating device (5) and the power resistor (6) mounted and connected thereto by screws. The two frames (2), (4) are fastened together by screws (25).
摘要:
A connecting terminal for connecting an electronic component to a printed circuit board includes a rectangular metal plate and a leg provided at each of four corners thereof. The approximate center of the metal plate is provided with a screw hole through which a screw is passed that is screwed into a terminal of a screw terminal-type electronic component. The legs of the connecting terminal, which are passed through pin holes provided in the printed circuit board, are soldered to an electrical circuit and thereby fixed to the circuit board. A screw which is screwed into the terminal of the screw terminal-type electronic component is passed through the screw hole of the connecting terminal. When the screw is tightened, the electronic component is secured to the printed circuit board.
摘要:
This invention provides compounds having antiviral activities especially inhibiting activity for influenza virus, more preferably provides substituted 3-hydroxy-4-pyridone derivatives having cap-dependent endonuclease inhibitory activity.
摘要:
A motor driving apparatus for driving and braking a motor equipped with a brake comprises a motor/brake driving DC power supply which is used both as a motor driving power supply and as a brake driving power supply, wherein when the motor/brake driving DC power supply is being used as the motor driving power supply, a voltage conversion circuit via which a voltage supplied from the motor/brake driving DC power supply is applied to the brake feedback-controls the voltage applied to the brake. This configuration serves to reduce the loss (due to temperature rise) in the brake coil of the motor being driven to move a robot arm.
摘要:
An object of the invention is to provide a communication terminal capable of causing an associated communication terminal to execute the function at the level required by the home terminal. A communication terminal of the invention is a video telephone 1 having a communication function and installing a common function to a function that a video telephone 2 installs, and includes a display image generation section 13A for generating data to execute the function that the video telephone 1 installs and data to execute the function that the video telephone 2 installs, and a data transmission section 11A for transmitting the data to execute the function that the video telephone 2 installs.
摘要:
An arc welding method using a welding material having a low transformation temperature, characterized in that it is carried out by the use of a shielding gas consisting of a rare gas alone or a mixed gas of a rare gas and a small amount of an oxygen gas; and an additional welding method using a welding material having a low transformation temperature, characterized in that it is carried out while moving a weld line in the form of a straight line. The former method allows the enhancement of a Charpy value in combination with improved fatigue strength, and the latter allows the experience of heat history of the material having a low transformation temperature to be suppressed, resulting in the prevention of weld crack in combination with an improved fatigue strength.
摘要:
Provided to the motor controller is means which can alter a conversion ratio with which a current value detected by a current detector is converted into a unit (such as voltage) easily usable in motor current control. According to the maximum current value of the motor and the demagnetization limit current of the motor, an optimum conversion ratio is selected and switched over. By making it possible to select and preset a conversion ratio, a plurality of motors can be controlled by one motor controller. Therefore, restrictions imposed on the combination of the motor controller and the motor are lightened.
摘要:
A bridge-type main valve located at a connecting outlet between a vacuum chamber and a main vacuum pump, and having a rod of an electric cylinder driven by a stepper motor connected to a valve seat for opening and dosing the connecting outlet so that the driving direction and a closing surface of the valve seat form a right angle. A piston may be attached to the rod, and a cylindrical housing fitted in the piston so that the piston and the cylindrical housing form a pressurized air pumping chamber for moving the rod and the valve seat in the outlet closing direction. The valve can achieve fine pressure adjustment without any variable orifice by stopping a valve seat at an arbitrary (not stepwise) position.
摘要:
A process for producing a cationic polymer, which comprises polymerizing a vinyl monomer represented by the general formula, ##STR1## wherein R.sub.1 represents --H or --CH.sub.3, R.sub.2 represents --CH.sub.2 CH.sub.2 -- or ##STR2## R.sub.3 and R.sub.4 represent --CH.sub.3 or --CH.sub.2 CH.sub.3, R.sub.5 represents --C.sub.n H.sub.2n+1, in which n is an integer of 0 to 4, ##STR3## or --CH.sub.2 COOH, and X.sup.- represents Cl.sup.-, CH.sub.3 SO.sub.4.sup.-, CH.sub.3 SO.sub.3.sup.-, or 1/2 SO.sub.4.sup.--, either alone or in admixture with up to 25% by weight, based on the total weight of the monomers, of other copolymerizable vinyl monomers in the presence of 7 to 18% by weight, based on the weight of the polymerization system, of water and, if necessary, choline chloride by use of a polymerization initiator and elevating the temperature, in the final polymerization stage, to 110.degree. to 150.degree. C. to complete the polymerization, thereby obtaining the water-soluble cationic polymer in the form of a lump. The polymer in the lump form thus obtained may be easily ground with a high efficiency at room temperature. The powdered polymer is excellent as a cationic flocculant.
摘要翻译:一种阳离子聚合物的制造方法,其包括聚合由通式表示的乙烯基单体,其中R 1表示-H或-CH 3,R 2表示-CH 2 CH 2 - 或R 3,R 4表示-CH 3 或-CH 2 CH 3,R 5表示-C n H 2n + 1,其中n为0至4的整数,或者是-CH 2 COOH,X表示Cl - ,CH 3 SO 4 - ,CH 3 SO 3 - 或1/2 SO 4 - 在基于聚合体系的重量的7至18重量%的存在下,单独或以至多25重量%的混合物,基于单体的总重量,其它可共聚的乙烯基单体的混合物,以及 如果需要,使用聚合引发剂进行氯化胆碱化,并在最终聚合阶段将温度升高至110℃至150℃以完成聚合,从而获得块状形式的水溶性阳离子聚合物 。 如此获得的块状聚合物可以容易地在室温下高效地研磨。 粉末聚合物作为阳离子絮凝剂是优异的。
摘要:
The present invention provides a compound having antiviral effects, particularly having growth inhibitory activity on influenza viruses, a preferred example of the compound being a substituted 3-hydroxy-4-pyridone derivative prodrug having cap-dependent endonuclease inhibitory activity.