Is widely used in all types of industries including

packaging, assembly, paper, printing, food processing, wood products,

machinery, electronics, and semiconductor manufacturing.

(a)  

Each motor moves a segment of the mechanical components of the

machine. The segment along with motor that moves is called an AXIS.

(a)  

Systems employed for motion control are called drives and may employ

any of the prime movers for supplying mechanical energy for motion

control.

(a)  

an initial source of motive power designed to receive and

modify force and motion applied by some natural source to drive

machinery.

(a)  

GIVE AN EXAMPLE OF PRIME MOVER

(a)  

Drives employing electric motors are called

(a)  

energy requirement for the operation of the system.

(a)  

modulators (adjust or convert) power flow from the

source to the motion

(a)  

actual energy (electrical to mechanical) converting machine

(a)  

usually a machinery to accomplish a given task.

(a)  

adjusts motor and load characteristics for the optimal mode.

(a)  

Electric motors can be powered by direct current (DC) sources, such

as from batteries, or rectifiers, or by alternating current (AC) sources, such

as a power grid, inverters or electrical generators.

(a)  

regulate the power flow from source to the motor to

enable the motor to develop the torque speed characteristics required by the

load.

(a)  

Classification of Power Modulators

(a)  

When a power modulator performs the function of electrical energy

conversion, it can be classified as a

(a)  

used to get DC supply of fixed voltage from the

AC supply of fixed voltage

(a)  

are employed to get

variable AC voltage of the same frequency from a source of fixed AC

voltage

(a)  

are used to get variable voltage DC

from a fixed voltage DC

(a)  

are employed to get a variable frequency AC supply from a

DC supply

(a)  

converts fixed voltage and frequency AC to variable

voltage and variable frequency AC

(a)  

used for the control of low cost DC and AC

drives and are also needed for dynamic braking of drives.

(a)  

may have two or more steps and can be controlled

manually or automatically with the help of contactors

(a)  

are employed for limiting

the starting current of AC motors

(a)  

Switching operations are required to achieve changing motor connections to change its quadrant operation, hanging motor circuit parameters in discrete steps for automatic starting and braking control

(a)  

an electrical machine that converts electrical

energy into mechanical energy. Most electric motors operate through the

interaction between the motor's magnetic field and electric current in a wire

winding to generate force in the form of torque applied on the motor's shaft.

(a)  

mechanically identical to an electric motor,

but operates with a reversed flow of power, converting mechanical energy

into electrical energy.

(a)  

Usually a machinery to accomplish a given task. The burden placed on

the motor due to this mechanical activity is referred to. Properly matching the motor load to the motor is important to prevent damage to the motor or inefficient and needlessly costly operation.

(a)  

Control for a power modulator are provided in the control unit. Nature

of the control unit for a particular drive depends on the power modulator

that is used. Because of their large number, only two cases are discussed in

this chapter.

(a)  

FACTORS INFLUENCING THE CHOICE OF ELECTRICAL DRIVES: Whether AC or DC supply is to be used for supply

(a)  

FACTORS INFLUENCING THE CHOICE OF ELECTRICAL DRIVES: Whether the load requires light or heavy starting torque

(a)  

FACTORS INFLUENCING THE CHOICE OF ELECTRICAL DRIVES: Whether load torque increases with speed remain constant

(a)  

FACTORS INFLUENCING THE CHOICE OF ELECTRICAL DRIVES: Whether the load has heavy inertia which may require longer straight

(a)  

Starting characteristics, Running characteristics, Speed control and Braking characteristics

(a)  

Whether the motor is going to the operator for a short time or whether it

has to run continuously intermittently or on a variable load cycle

(a)  

Type of enclosures, type of bearings, transmission of drive and Noise

level. Due to practical difficulties, it may not possible to satisfy all the above

considerations. In such circumstances, it is the experience and knowledge

background which plays a vital role in the selection of the suitable drive.

(a)  

During (a)   motor should supply not only the load torque

but an additional torque component in order to overcome the drive inertia.

In drives with large inertia, motor torque must exceed the load torque

by a large amount in order to get (a)   .