Abstract:
PURPOSE: An overhanging type magnetic levitating transportation system is provided to reduce the friction loss and noise by using a contactless power supply device. CONSTITUTION: A fixing part(100) is arranged along the moving period of a movable part(200). The movable part is moved along the fixing part with the levitation force of the flotation electromagnet and the driving force of the linear induction motor. The movable part is rotatably combined in a vehicle body(300). A contactless power supply device(101) is arranged in one side of the rigid frame of the fixing part. The contactless power supply device supplies power from the fixing part to the movable part.
Abstract:
PURPOSE: A method is provided to prevent the disturbance of a magnetic levitation system due to the normal force of a linear induction motor by uniformly maintaining the normal for force of the linear induction motor. CONSTITUTION: A linear induction motor(20) has a initial magnetization state section, an acceleration state section, and a steady state section. A d-axis current instruction value is given as a ramp function and a q-axis current function in order to uniformly maintain the normal force. A d-axis current instruction value is given as the ramp function when the linear induction motor is initially magnetized. A d-axis current instruction value is given as the q-axis current function when the linear induction motor is accelerated.
Abstract:
PURPOSE: A method is provided to automatically control the speed and the location of a magnetic levitation vehicle by using a bar code and a bar code reader. CONSTITUTION: A current position of a vehicle is obtained with a bar code positioning system. A variable for deciding the driving direction of a vehicle is selected according to the kind of rail. A target position of a vehicle is inputted. The driving direction of a vehicle is determined according to the kind of rail. The location and speed control of a vehicle is executed from the reference location to the target position. A bar code positioning system comprises a bar code sheet(26) and a bar code reader(28). The bar code sheet is attached to the side of rail. A bar-code reader is attached to the chassis structure of a vehicle.
Abstract:
A capacitance measuring displacement sensor structure for radial active magnetic bearing and a malfunction decision method thereof are provided to improve endurance against the noise delivered from the inverter or rotor by disconnecting the power ground in which a noise passes. A capacitance measuring displacement sensor structure for radial active magnetic bearing comprises a rotor providing virtual ground, cylindrical sensor electrode surfaces(110,111,112,113) arranged apart from the surface of the rotor, a guard electrode(120) covering the sensor electrode surfaces, a signal contact surface(130) surrounding the sensor electrode surfaces and the guard electrode surface and providing the reference of measurement signal, a stator body(300) placed outside the signal contact surface, a transducer(500) blocked from the sensor electrode, the guard electrode, and the signal ground of each sensor, a magnetic bearing controller(600) controlling a magnetic bearing, and a magnetic bearing driver(800) and an electric motor driving inverter(700) for the drive of the magnetic bearing.
Abstract:
An apparatus for measuring velocity and angle of a rotator using a hole device are provided to secure stable start of permanent magnetic motor by obtaining initial start torque. Hall sensors(110, 120, 130) are joined to the stator of the electric motor by a phase difference of 120 degrees. A digital filter(200) removes a noise of output signals of hall sensors, and a phase lag circuit(210) delays the output signal of the digital filter. A forward reverse signal generator(320) generates a forward or a backward signal, and an edge circuit(400) detects the edge of the phase delay signal. The virtual z-phase signal detection unit(500) detects the virtual z-phase signal, and the virtual z phase pulse generating section(510) generates a pulse train of the virtual z phase signal.
Abstract:
A large area and high precision roll exposure apparatus is provided to manufacture a roll mold having a large area of several hundreds of millimeters and a line width of high precision of several decades of nanometers or less. A large area and high precision roll exposure apparatus comprises a rotation roll(10) which is arranged in horizontal direction; the first and second fixing chucks(11) which supports the both end parts of the rotation roll with placing the rotation roll between them; a roll support(13) which supports the fixing chucks and the rotation roll; a beam source(17) which irradiates beam in the direction perpendicular to the rotation roll; a roll rotation unit which is installed at the first and/or second fixing chucks to rotate the rotation roll; and a linear transfer part which supports the lower end part of the roll support and moves right and left the roll support linearly.
Abstract:
기존 회전기의 자기 베어링 장치는 반경방향의 위치를 제어하는 반경방향(radial) 자기 베어링과 축방향의 위치를 제어하는 축방향(axial) 자기 베어링으로 구성되어 있다. 기존 회전기의 자기 베어링 장치는 반경방향 자기 베어링만 사용할 경우 반경 방향의 힘은 크나 안정된 축방향 힘이 적으므로 축방향 제어를 위한 축방향 자기 베어링이 추가로 필요하게 되어 총 3개의 베어링이 필요하였다. 본 발명의 반경방향 자기 베어링은 고정자와 회전자의 자극 중간에 각각 비자성체를 삽입함으로써, 안정되고 기존의 반경방향 자기 베어링 보다 큰 축방향 힘을 얻을 수 있다. 따라서 기존의 축방향에 대한 부수적인 축방향 자기 베어링 없이 반경방향 자기 베어링만으로 회전기의 자기 베어링 장치를 구성할 수 있다.
Abstract:
PURPOSE: A transverse flux monopole magnetizer is provided to have residual magnetic field by attaching a field-free permanent magnet material at an iron core simply and supplying an impulse current to a coil. CONSTITUTION: A magnetizer winding(2) is wound at an iron core of a magnetizer to supply a magnetization current. The iron core(4) of the magnetizer forms a close loop of flux via a magnetized object when applying the magnetization current to the winding. A magnetizer driving part supplies a magnetization current to the winding. The iron core includes a lower part(1D) opposite to a side of the object, a pillar part(1C) formed at a top of the other side of the lower part, a top part(1A) integrated with the pillar part so as to be opposite to the lower part, and a protrusion part(1B) formed in parallel with the pillar part.
Abstract:
Disclosed is a brushless generator with permanent magnets, which provides high-speed operation, simple maintenance, lightweight, and stable power. The brushless generator with permanent magnets including a main generator with a stator and a rotor; and an auxiliary generator having a stator made of a hollow stator core and a coil wound around the stator core, and a rotor made of a rotor core rotating within the stator core and a coil wound around the rotor core, where wedges and grooves are formed alternatively on the inner portion of the stator core of the auxiliary generator, and permanent magnets are embedded in the body of the grooves and the coil is wound around the body of the grooves. Accordingly, without the use of a brush, a rated load voltage is generated from the permanent magnets of the auxiliary generator, and voltage variations due to load variations are controlled by the windings of the auxiliary generator. Therefore, along with reduction in capacity of controller, high-speed operation and highly efficient operation become possible, small size and lightweight can be obtained, and maintenance can be simpler.
Abstract:
PURPOSE: A brushless generator using a permanent magnet is provided to generate and rectify a voltage and supply the rectified voltage to an exciter of a main generator by using a permanent magnet and a wire of an auxiliary generator. CONSTITUTION: A main generator(12) is formed with a fixing portion and a rotary portion. The fixing portion is formed with a steel core(10) and a wire(9) wound around the steel core(10). The rotary portion is formed with a steel core(8) and a wire(7) wound around the steel core(8). An auxiliary generator(11) is installed at the rotary shaft(6) inserted into the steel core(8) of the rotary portion of the main generator(12). The auxiliary generator(11) is formed with a fixing portion and a rotary portion. The fixing portion is formed with a steel core(3) and a wire(1) wound around the steel core(3). The rotary portion is formed with a steel core(5) and a wire(2) wound around the steel core(5).