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1820 results about "Linear drive" patented technology

Description: Linear drives are a gearless mechanical transmission which converts rotary motion of a drive shaft to linear motion.

Mask aligner mask platform adopting magnetic suspension technology

The invention provides a mask aligner mask platform adopting the magnetic suspension technology. The mask aligner mask platform mainly comprises a precision slideway, a base, a suspension and the like, wherein the inside of the suspension is provided with an electromagnet which combines with a vortex displacement sensor to realize that the suspension is suspended above the slideway stably; the stator of a linear electric motor is fixed on the base, the rotor of the linear electric motor is fixed on the suspension; and the slideway surface is provided with a linear scale which combines with a linear scale reading-head arranged on the suspension to realize the precise and linear positioning motion of the suspension. The magnetic suspension mask aligner mask platform provided by the invention utilizes electromagnetic attraction and electromagnetic linear drive to ensure that the mask aligner mask platform can perform precise and fast reciprocating linear positioning motion, realize the functions of ultra-clean, high-speed, long-distance and precise positioning motion and the like which can not be realized by using the traditional scheme using a rotary servo motor for drive, a precision ball lead screw for transmission and a slideguide for support, and have higher suspension stiffness and better load-bearing characteristic than the gas phase suspension mask aligner mask platform.
Owner:CENT SOUTH UNIV

Electromagnetic clamping mechanism and linear driving device and combination with same

The invention provides an electromagnetic clamping mechanism which comprises an electromagnet, a permanent magnet and a deformable body. The permanent magnet is arranged on a magnetic link of the electromagnet, a control magnetic circuit is formed between the permanent magnet and the electromagnet, the permanent magnet moves relative to the electromagnet under the drive of the magnetic field of the control magnetic circuit, the deformable body is driven to deform, and then clamping locking and releasing are achieved. The invention further provides a linear driving device and combination with the electromagnetic clamping mechanism. According to the electromagnetic clamping mechanism and the linear driving device and combination with the electromagnetic clamping mechanism, due to the fact that magnetic poles of the permanent magnet and the electromagnet make contact with each other or are close to each other, the functions of large driving force, large displacement, high-precision driving and power off clamping keeping are formed, existing electric and magnetostrictive drive material application equipment and instruments are improved, and the electromagnetic clamping mechanism and the linear driving device and combination with the electromagnetic clamping mechanism can be widely applied in the field of drivers (actuators), brakes, sensors, motors, vibration and control equipment, robots, precision manufacturing, biomedical engineering and the like.
Owner:杨斌堂

Six-degree-of-freedom parallel posture adjustment and vibration isolation platform containing tower-shaped telescopic branches

InactiveCN105500348ABig spaceMake up for the lack of work spaceProgramme-controlled manipulatorWork benchesClosed loopEngineering
The invention discloses a six-degree-of-freedom parallel posture adjustment and vibration isolation platform containing tower-shaped telescopic branches. The six-degree-of-freedom parallel posture adjustment and vibration isolation platform mainly comprises a base, three mounting seats, six linear driving units with the same structure, three tower-shaped telescopic branches with the same structure, three vibration isolators, a power-assisted spring and a movable platform, wherein the three mounting seats are arranged on the base; each mounting seat is fixedly connected with two linear driving units; each of the tower-shaped telescopic branches consists of two closed-loop connection rods and a planar shear fork mechanism; two tower legs at the lower end of the planar shear fork mechanism of each tower-shaped telescopic branch are respectively connected with sliding blocks of two adjacent linear driving units through ball hinges, and the upper end of the tower-shaped telescopic branch is a rotation pair connected with the two closed-loop connection rods; the rotating shaft of the rotating pair is connected with one end of the vibration isolator through a universal hinge; the other end of the vibration isolator is fixedly connected with the movable platform; the lower end of the power-assisted spring is fixedly connected to the base, and the upper end of the power-assisted spring is a free end. The six-degree-of-freedom parallel posture adjustment and vibration isolation platform occupies a small volume and is high in rigidity and high in bearing capacity and large in working space.
Owner:YANSHAN UNIV

POS machine magnetic head test method and POS machine card swiping test equipment

The invention discloses a POS machine magnetic head test method and POS machine card swiping test equipment. The POS machine magnetic head test method includes the steps that a magnetic card special for test is swiped in a POS machine magnetic head card slot in a reciprocating mode, a POS machine sends magnetic card information read every time to an upper computer, the upper computer compares the received magnetic card information with presorted standard information, correct information is marked as successful card swiping, and incorrect information is marked as unsuccessful card swiping. According to the POS machine magnetic head test method, the card is swiped in the reciprocating mode in the test process, and therefore the card swiping speed is increased; a test working mode is set is in the POS machine, induction of a magnetic head is continuously detected, and therefore test efficiency is improved; the upper computer special for test is adopted, test results are stored in a list form, and therefore test centralized management of the POS machine is easy to achieve. According to the test equipment, a mechanical chuck is utilized to clamp the test magnetic card, card swiping power is provided by a linear drive mechanism, automatic card swiping test is achieved, the card swiping speed is increased, labor is saved, and cost is reduced.
Owner:SHENZHEN XINGUODU TECH

Dynamic linear control light emitting diode (LED) driver circuit

The invention discloses a dynamic linear control light emitting diode (LED) driver circuit which comprises a rectifier module, a sampling module, a feedback module, a constant-current control module, a constant-current driver module. The rectifier module is used for converting input mains supply signals to linear driving voltage signals which are output to an LED load. The sampling module is used for acquiring driving current which flows through the LED load. The feedback module is used for acquiring the linear driving voltage signals. The constant-current control module is used for generating constant current adjusting signals according to the driving current and generating constant current control signals according to the linear driving voltage signals. The constant-current driver module is used for controlling current of the load to be constant current according to the constant current adjusting signals and the constant current control signals. According to the dynamic linear control LED driver circuit, a conducting mode and a non-conducting mode of a power switch can be chosen according to the magnitude of linear voltage of the LED load, and therefore the linear LED driving efficiency can be greatly improved. More specially, when input voltage is low and the LED load is in a high-working-efficiency mode, the constant-current control module enables the power switch to be in the conducting mode, and therefore a constant current output state of an LED is guaranteed; and when the input voltage is high and the LED load is in a low-working-efficiency mode, the constant-current control module enables the power switch to be shut down forcibly.
Owner:上海芯飞半导体技术有限公司
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