Abstract:
The present invention relates to a superconducting eddy current braking system for a railroad car, which can increase the braking power of a railroad car without giving influence on a railway by comprising: a superconducting electromagnet module (110) which is placed in the lower part of a railroad car (20) in order to vertically move with respect to a conductive plate (200) placed between driving rails (10); and an elevation driving unit (120) which vertically drives the superconducting electromagnet module (110). Therefore, the superconducting eddy current braking system can perform effective braking through a strong magnetic field, can increase the braking power of the railroad car by generating large eddy current using a nonmagnetic material with excellent conductivity such as copper and aluminum, and can remove the need of an additional pore control device for controlling void between the superconducting electromagnet module and the conductive plate.
Abstract:
An LSM section switch test device for a superhigh-speed train according to an embodiment of the present invention comprises a vehicle in which a permanent magnet is attached to the lower part; a power conversion unit which supplies power by forming a plurality of inverters; a track which generates a magnetic field by being electrically connected to the power conversion unit and receiving the power from the power conversion unit and in which a stator of a linear synchronous motor (LSM) generating propulsion to drive the vehicle using interaction between the magnetic field and the permanent magnet is disposed to be divided into at least one section; and a monitoring unit which monitors driving data of the vehicle driving on the track.
Abstract:
The present invention relates to a wheel-on-rail railroad system using propulsion by both a linear motor and a rotary motor capable of being driven at super-high speed using a linear motor propulsion device while not including a large-capacity rotary motor propulsion device for a contact-type railroad car driven in a wheel-on-rail method. In the railroad system, a railroad car (30) is driven in a wheel-on-rail method along a rail (10). The railroad system includes: a rotary motor driving unit (110) which is included in the railroad car (30) and receives power to drive the wheels of the railroad car and provide propulsion force from an electric car line (20); a field magnet unit (210) which is placed in the lower part of the railroad car (30); and an armature unit which is placed on the ground along the rail (10), generates a movable magnetic field, and provides propulsion force to the railroad car (30) through electromagnetic interaction with the field magnet unit (210). Since the propulsion force of the railroad car (30) is provided by operation of the motor driving unit (110) during a low-speed driving period, while during a high-speed driving period, the propulsion of the railroad car (30) is provided by electromagnetic force of the field magnet unit (210) and the armature unit (220), the railroad car is able to operate on a normal low-speed track of the existing electric car line method as well as at high speed and reduce abrasion of the wheels during super-high speed driving since the volume or weight of a rotary motor propulsion device to be loaded on the railroad car can be reduced compared to a normal high-speed railroad car.
Abstract:
PURPOSE: An offset compensation filter circuit is provided to minimize a position detection error due to DC offset while removing noise using DC offset compensation and a low pass filter of a higher priority. CONSTITUTION: An offset compensation filter circuit(200) includes a hall sensor unit(210), a compensation filter unit(230) and a zero-cross detection unit(250). The Hall sensor unit senses a magnetic field of an electronic coil in a propulsion system of an LSM and provides the sensed signal. The compensation filter unit includes a compensation unit(231) and a filter unit(233). The compensation unit provides a compensation signal in which a DC offset voltage and a noise are removed with respect to the sensed signal by receiving the sensed signal. The filter unit provides a compensation filter signal in which DC offset is removed by receiving a compensation signal from the compensation unit.
Abstract:
PURPOSE: A bulk power source switching element drive control circuit and a direct current load device using the same are provided to eliminate an unstable element of a system due to oscillation of a snubber circuit by possessively controlling a switching element and eliminating the snubber circuit. CONSTITUTION: A power supply unit(110) comprises a first partial pressure unit and a second partial pressure unit at both ends of a high voltage direct current power supply. A switching unit(120) comprises a first switching element, a first diode, a second diode. A speed changing unit(130) comprises a secondary coil inducing necessary low voltage from a primary coil. A load power supply unit(140) comprises a rectification bridge circuit which is serially connected with the secondary coil. An inverter(160) is connected with the load power supply unit in order to supply AC voltage to an AC load device(300).
Abstract:
PURPOSE: A switching control method of a hybrid magnetic floating system power conversion device is provided to reduce switching loss of a power conversion device and a noise of a hybrid floating magnet by switching a gate of the power conversion device. CONSTITUTION: A gate driving unit(40) independently outputs a pulse width modulation signal for controlling gates of four power conversion devices of the four high limit choppers. The power conversion devices include the first power conversion device(110), the second power conversion device(120), the third power conversion device(130) and the fourth power conversion device(140). The first power conversion device is serially connected to the second power conversion device. The first and the second power conversion device are connected in parallel to a capacitor(150). The third power conversion device is serially connected to the fourth power conversion device. An output end of the first power conversion device is connected to an input end of a hybrid magnet coil. An output end of the hybrid magnet coil is connected to an input end of the fourth power conversion device. The gate driving units include at least two times for generating the pulse width modulation signals.
Abstract:
PURPOSE: A simulation system for performing a performance test of a motor for a railway vehicle is provided to reduce the incidental expense by obtaining a test result from a simulation test process. CONSTITUTION: A simulation system for performing a performance test of a motor for a railway vehicle includes a test driving unit and a simulator unit. The test driving unit(10) provides necessary current when a performance test of an arbitrary motor for a railway vehicle is performed. The simulator unit(20) receives characteristics of a testing motor and load characteristics from an arbitrary tester and sets up the test environment thereby. The simulator unit receives the current from the test driving unit, performs the performance test under the test environment, and output a test result.
Abstract:
The present invention provides a gate drive for protecting a switching element (IGBT) used for an electrical inertial load controller. A high-voltage IGBT is used as the switching element and an hcp1316j is used as the gate drive of the IGBT, to restrict overvoltage and overcurrent generated in the event of inverter switching, preventing destruction of the IGBT in advance. Furthermore, an RC filter is formed in close proximity to the IGBT to minimize an erroneous switching operation due to harmonics generated caused by noise in case of inverter switching to improve the system reliability and block an increase in abnormal voltage applied across the switching element.
Abstract:
PURPOSE: A control device for testing an electrical inertia load of a railroad car is provided to reduce a manufacturing cost and a malfunction of the control device by adding a function of an A/D converter, a function of a flash ROM, and a pulse width modulation function to a high-speed operating function of existing DSP(Digital Signal Processing) portion. CONSTITUTION: A control device is formed with a power supply converter for supplying electric power to an inertia simulator, an AD converter for measuring output torque and the amount of current of the power converter, an encoder portion for measuring a speed of a motor, a power converter for reducing the power for sharing a DC link terminal, and a database unit for consuming the power to prevent a boosting phenomenon of the DC link terminal. TMS320F240 is used as a microprocessor. The TMS320F240 has a function of an A/D converter, a function of a flash ROM, and a pulse width modulation function as well as a high-speed operating function of an existing DSP portion.