Dynamic Electric in Electric Drives

Dynamic Electric in Electric Drives:

Basic Elements of Electric Drive : Basic Elements of Electric Drive- Before discussion makes clear that an electric drive system basically consists of a mechanical load to which the required mechanical motion is imparted through a transmission drive usually equipped with gears or pulleys. Gearless transmission is possible sometimes, in which case there exists a direct coupling between the motor and load. The system also comprises certain controls for the motor for precise adjustment of the speed-torque curve as demanded by the …


Classification of Electric Drive : Classification of Electric Drive are normally classified into three groups, based on their development, namely group, individual and multi motor electric drives. If several groups of mechanisms or machines are organised on one shaft and driven or actuated by one motor, the system is called a group drive or shaft drive. The various mechanisms connected may have different speeds. Hence the shaft is equipped with multi stepped pulleys and belts for connection to individual loads. In this type …


Dynamic Conditions of a SystemDrive : Dynamic or transient conditions occur in SystemDrive systems when the operating point changes from one steady state condition to another, following a change introduced in the system variables. These variables may be mechanical, such as speed, torque, etc. or electrical, such as voltage, current etc. These conditions generally exist during starting, braking and speed reversal of the drive. The dynamic conditions arise in a variable speed drive when transition from one speed to another is required. The …


Dynamic Electric : Dynamic Electric – An industrial drive system basically consists of a mechanical working equip­ment or load, which has to be kept in motion to turn out mechanical work, equipment to do this job, called the prime mover, and a transmission to trans­fer energy from the prime mover to the mechanical load. Transmission equip­ment such as a gearing or belt may be used to match the speeds of the prime mover and the load. The transmission may also be required …


Transient stability in Electrical Drives : Transient stability in Electrical Drives – From the preceding discussion it is clear that a drive is in its state of equi­librium at constant speed if the developed motor torque is equal to the sum of load torque and friction. The basis of the investigation of the dynamics of a drive from one steady-state equilibrium condition to another has already been discussed in detail. Electrical drives have closed loop control systems. Investigations on the stability of …