摘要:
A dynamic braking circuit that can be operated with stability over both high and low speed regimes. This circuit has the advantage of using fewer components than previous circuits. In addition, when in braking mode, the armature and field currents tend to oppose each other across the main braking switch hence reducing electromechanical stresses when in high current regime. According to a second embodiment, a dynamic braking circuit implements a “soft” extended braking function with the capability of providing a smoother braking action at high braking effort at little extra cost resulting from the replacement of a contactor by a reverser. The main advantages of this preferred embodiment are that the current generated by the armatures during braking can be controlled independently from the excitation of the field windings at low speeds and that it enables simultaneous self supply, regeneration and dynamic braking.
摘要:
Methods of dynamic braking include two embodiments with braking circuits for vehicles such as, for example, locomotives which are operable down to very low speeds. These circuits can provide a braking force even at zero locomotive speed.
摘要:
The present invention relates generally to regenerative braking methods for a hybrid vehicle such as a hybrid locomotive, which are compatible with optimum management of a large battery pack energy storage system. Four methods for recovering energy from regenerative braking and for transferring this energy to an energy storage systems are disclosed. These methods may also be used with battery operated vehicles.
摘要:
Methods of dynamic braking include two embodiments with braking circuits for vehicles such as, for example, locomotives which are operable down to very low speeds. These circuits can provide a braking force even at zero locomotive speed.
摘要:
A method and system of temperature control of heavy hydrocarbons in a consist of rail cars is disclosed wherein waste heat from one or more of the locomotives propelling the train is utilized to heat the heavy hydrocarbons in a consist or ambient air is used to cool the heavy hydrocarbon cargo. The train is typically comprised of tanker cars that can be filled with raw heavy hydrocarbon, not dilbit thus allowing about 20% to about 30% additional heavy hydrocarbon to be transported in each tanker car. The system can keep the heavy hydrocarbon at a first, lower temperature en route and increase temperature to a second higher temperature as the train nears its terminus so that the tanker cars can be quickly emptied of their contents at the receiving terminal without the need to heat the tanker cars at the unloading terminal. The method disclosed herein for heating tanker cars in transit is to utilize waste heat from the locomotive diesel or gas turbine engines which is otherwise exhausted to the atmosphere.
摘要:
The present invention combines the principles of a gas turbine engine with an electric transmission system. A method and apparatus are disclosed for utilizing metallic and ceramic elements to store heat energy derived from a regenerative braking system. The subject invention uses this regenerated electrical energy to provide additional energy storage over conventional electrical storage methods suitable for a gas turbine engine. The subject invention provides engine braking for a gas turbine engine as well as reducing fuel consumption.
摘要:
A system of dense packaging of turbomachinery in a gas turbine engine by means of close-coupling of components and by the ability to rotate various engine components with respect to other engine components is disclosed. In addition, spool shaft rotational direction may be reversed to suit the application. In multiple engine configurations, the same ability to close-couple and rotate components and to reverse shaft rotational direction in order to rearrange the engine geometry package is used for packaging two or more gas turbine engines to achieve high power density. Dense-packing is possible because of a number of features of the basic engine. These features include: the use of compact centrifugal compressors and radial turbine assemblies; the close coupling of turbomachinery for a dense packaging; the ability to rotate certain key components so as to facilitate ducting and preferred placement of other components; the ability to control spool shaft rotational direction; and operation at high overall pressure ratios.
摘要:
A control system for individually controlling power from a single voltage source to a plurality of motors is described. A chopper circuit, in conjunction with the control system, generates drive-pulses, which operates the IGBT switching devices to sequentially provide pulses to each motor.
摘要:
A method is disclosed for constructing a locomotive, in part, from serviceable used parts from one or more other locomotives. The principal part that is used in this new locomotive configuration is a single, used locomotive truck assembly. The various embodiments and configurations of the present invention are directed generally to a purpose-built locomotive that incorporates parts from other locomotives in a unique way. The present invention can be summarized as a method creating a simple locomotive that is well adapted to switching and spotting functions that shares commonality with other larger locomotives both in terms of components and design. Because this new piece equipment is built in part from a plentiful supply of under-valued surplus components, it will be economical to construct and maintain. The locomotive may also include a self-elevating system so that the truck assembly can be accessed or removed rapidly for maintenance or repairs.