Contribució a les bases metodològiques per a la selecció i dimensionament de l'accionament i la transmissió per a moviments ràpids, en base al mètode ?-K
- Autores: Carlos Domenech Mestres
- Directores de la Tesis: Carles Riba i Romeva (dir. tes.), Joan Bergas Jané (codir. tes.)
- Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2016
- Idioma: catalán
- Tribunal Calificador de la Tesis: Joan Roca Enrich (presid.), Jordi Martínez Miralles (secret.), Marc Carreras Pérez (voc.)
- Materias:
- Enlaces
- Tesis en acceso abierto en: TDX
- Resumen
The dynamic behaviour of rapid movement systems is often counterintuitive, and the major decisions regarding the drive chain (motor, transmission and auxiliary components) are adjusted by means of alterations in the control strategy. This thesis presents a methodology for selecting motors and transmissions for rapid movements based on the power rate vs. kinetic energy method, representing the characteristics and solicitations of the motor in the P ¿-K diagram.
The methodology developed in this thesis is based on two important aspects of the rapid movement drive selection. The first aspect refers to the shape of the movement diagram and its implications on strategies for different displacement movements, as well as their relationship to the specifications of the motor and transmission. The second aspect is the definition of a model that represents the system behaviour with sufficient accuracy.
The shape of the movement diagram is analysed in two stages. The first stage refers to the optimal movement strategy for a given load, being either triangular or trapezoidal. The result of this stage is a methodology to select a transmission for a load (or a set of loads) given an adequate motor for all cases. After selecting the transmission, this methodology can determine the error for each loading case relative to the optimal solution (triangular or trapezoidal movement strategy). The resulting parameter of the first analysis, the load acceleration, is employed in the dimensioning of the motor and transmission.
In the second stage of the movement diagram analysis, the effects of the acceleration variation are studied if the case of smooth speed transitions. The result of this stage is an acceleration value of the load as a function of acceleration variation ratio.
In previous research, the definition as proposed in this thesis takes into consideration the global efficiency, while ignoring the torque associated with the motor as negligible. In this thesis, those parameters are taken into consideration in the equations, thus increasing the range of validity of the P ¿-K method. The resulting magnitudes will be the specifications of a valid motor drive, as well as an appropriate speed ratio between the motor and the load in order to select an adequate transmission.
This method facilitates the comparison of different systems, either a single load, a set of motors, or a set of loads with an adequate motor for all of them. This thesis addresses the theoretical foundations of this method and develops an optimization method for the system, which is subsequently illustrated through numerical examples.
