36 results about "Form constant" patented technology

The invention discloses a constant direct-axis current control method and system of an embedded permanent magnet synchronous motor, and belongs to the technical field of motors. According to the constant direct-axis current control method and system disclosed by the invention, a coordinate original point O and an intersection point A of a limited current circle and a quadrature-axis current form constant direct-axis current control of a constant torque output region, an intersection point of a straight line perpendicular to a direct-axis current and extending from a center C of a voltage limited oval of a control region of the embedded permanent magnet synchronous motor and a center point B of the voltage limited oval form constant direct-axis current control of a constant power output region, a phase current, a phase voltage and a rotational speed of the embedded permanent magnet synchronous motor are detected according to a target rotational speed of the embedded permanent magnet synchronous motor, and the embedded permanent magnet synchronous motor is driven to work by utilization of the constant and invariable direct-axis current and an inverse relation between the quadrature-axis current and the rotational speed of the motor. The constant direct-axis current control method and system have the characteristics of fast response speed, high reliability and no speed limit control, and have good application prospects in the fields of new energy automobiles and the like.

The invention discloses an online type integrated switching type constant-current charging device. The online type integrated switching type constant-current charging device comprises an industrial frequency transformer, a rectification and filtering circuit, a constant-current charging power circuit, a constant-current charging control circuit and an output filtering circuit. The AC 220-V alternating current is transformed by the online type industrial frequency transformer T1 and then is output to an integrated bridge type rectifier D1, and then is rectified by the D1, and stable direct-current voltage VIN is output by a capacitor C1; the direct-current voltage VIN is output to the constant-current charging power circuit; the constant-current charging power circuit is controlled by the constant-current charging control circuit to output constant current to the output filtering circuit, and the output constant current is filtered by the output filtering circuit to form constant direct current output. The online type integrated switching type constant-current charging device has the characteristics of strong power grid adaptation capability, wide output voltage range, rapid charging speed, automatic floating charge mode, high reliability, strong environment adaptation capability and the like.

The invention relates to a preparation method of a degradable polybutylene adipate / potassium bromide composite. The preparation method includes: (1) grinding potassium bromide particles prior to vacuum drying for standby; (2) putting PBA into a volumetric flask, and forming constant volume with a good solvent CHCl3 to enable PBA to dissolve completely; (3) adding KBr into prepared PBA solution to obtain KBr blended solution; (4) adding ionized water into the PBA solution different in KBr content, performing room-temperature ultrasonic treatment on the volumetric flask to prepare PBA / KBr membrane casting suspension; (5) subjecting the prepared PBA membrane casting suspension to spin coating to obtain a composite film, and performing vacuum drying for 6 hours after solvent CHCl3 completely volatilizes at room temperature; (6) subjecting the prepared composite film to constant temperature culture to eliminate thermal history; (7) subjecting the composite film with thermal history eliminated to constant temperature culture till fully recrystallized; (8) cooling the fully crystallized product in the step (3) to room temperature for under test. The preparation method is simple and scientific in process, low in cost, controllable in procedure and hopeful in industrial production, and has tremendous potential application prospect and economic benefit.

Technical field: the invention relates to the field of textile, in particular to an integral yarn automatic lubricating device used in textile industry for mitigating friction between yarn and machine. The aims of the invention are realized by the following measures: a lubricating box (1) is connected with a transparent dust cover (2), a cone-shaped lubricating block (3) is plugged in the lubricating box (1), a porcelain eye (4) is connected on the top central hole of the cone-shaped lubricating block (3) in a plugging way, yarns (5) are led out through the central hole of the porcelain eye (4), a central tube (11) of the dust cover is plugged in a yarn ball (8), a door of dust cover door (6) is connected with a hinge (9), clasp (7) and clasp (10) are locked when closing the door, and a dust discharge port (12) is connected with a dust collector for dedusting. The device can be applied to integrated design of multiple storehouses numbering 1, 2, 3, 4...12, mainly used in textile industry, and on equipments such as braiding machine, strand combining machine, weaving machine, warp knitting machine, beam-warping, spinning machine, yarn forming machine and the like. The structure is characterized in that natural air ring is generated when a yarn roll is unwinded during beam-warping to form constant corkscrew force to straighten hairfeather, yarns rotate 360 degrees to be uniform and smooth. The invention is defined as: uniformity and smoothness are achieved while straightening hairfeather by rotating 360 degrees.

The invention relates to a strong abrasion resisting electric arc spraying powder core wire containing Ti (C, N) hard phase and a preparation method thereof. The wire comprises the following powder core raw materials by mass percentage: 13-17% of Ti (C, N) powder, 16-20% of Cr powder, 17-23% of Cr2C3 powder, 9-13% of Ni powder, 1-3% of Mo powder, 15-17% of Si-Fe powder, and the rest being Mn-Fe powder. The preparation method comprises the following steps: (1) the powder core raw materials are weighed in proportion; (2) the powder core raw materials are mixed; (3) steel strips are used to wrapthe mixed powder core raw materials to form thick wires; (5) the diameter of the thick wires is reduced grade by grade to form finished wire products. The wires can form constant dense protective coating on metal substrates by electric arc spraying, especially supersonic electric arc spraying, the protective coating has Ti(C, N)-based metal ceramic texture and performance, and has the characteristics of stainless steels, has higher hardness, red hardness, abrasion resistance, crater wear resistance and high pyrochemical stability, and is mainly used in surface protection for equipment such asboiler three pipes under high temperature and high abrasion and corrosion.

The invention provides a comparator for a oscillator circuit with a self bias reference voltage. The comparator includes: a depleted metal oxide semiconductor transistor network which forms constant current equivalent connection, wherein a gate electrode and a source electrode which belong to the depleted metal oxide semiconductor transistor are connected; a enhanced metal oxide semiconductor transistor network, wherein a drain electrode or a source electrode of the enhanced metal oxide semiconductor transistor is connected with the depleted metal oxide semiconductor transistor in series, and a gate electrode terminal can receive a input voltage. The comparator outputs a high level signal when the input voltage is lower than the reference voltage and a low level signal when the input voltage is higher than the reference voltage. Moreover, the oscillator circuit with the comparator ensures that the reference voltage is independent from changes of external voltage source and temperature.

PURPOSE: A composite magnetic powder and a dust core using the same are provided to form constant resistance of a surface of each composite magnetic powder by cohering binder resin on a surface of composite magnetic powder. CONSTITUTION: Magnetic material powder(10) is formed by combining a soft magnetic particle(11). The magnetic material powder is coated on a binder resin. The most surface of the magnetic material does not include a soft magnetic particle. A surface approximation line A is located inside composite magnetic powder. The surface approximation line A puts a line of a soft magnetic particle.

In the space solar battery string non-contact pressure exerting method used is pressure exerting device with corresponding shape and size to space solar battery string. There is a gas storage cell inside the pressure exerting device, and gas entrnace is at top end of the gas storage cell, some small gas exit are arranged at the bottom end of the gas storage cell. The pressure exerting device is fixed on robot which drives pressure exerting device moving straight above the solar battery, controlls relative space between pressure exerting device and space solar battery, makes gas into gap of space solar battery and pressure exerting device through the small hole on pressure exerting device after gas source is put-through to form constant pressure space to make solar battery be firm fixed on said board.