The Figure at the represents a DC motor attached to an inertial load. The voltages applied to the field and armature sides of the motor are represented by Vf and Va.

__Transfer Function For DC Motor__

The Figure at the represents a DC motor attached to an inertial load. The voltages applied to the field and armature sides of the motor are represented by V*f and Va.* The resistances and inductances of the field and armature sides of the motor are represented by R*f*, L*f*, Ra and La. The torque generated by the motor is proportional to I*f* and ia the currents in the field and armature sides of the motor.

In a Field-current controlled motor, the armature current ia is held constant, and the Field current is controlled through the field voltage V*f*. In this case, the motor torque increases linearly with the field current. We write

By taking Laplace transforms of both sides of this equation gives the transfer function from the input current to the resulting torque.

For the field side o the motor the voltage/current relationship is

The transfer unction from the voltage to the resulting current is found by taking Laplace transforms o both sides of this equation.

The transfer unction from the input voltage to the resulting motor torque is found by combining equations (1.2) and (1.3).

Combining equations (1.4) and (1.5) gives the transfer unction from the input field voltage to the resulting speed change.

Finally, since w=dq/dt, the transfer unction from input field voltage to the resulting rotational position change is

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Solid State Drives : Design of Controllers For Drives : Transfer Function For DC Motor |

**Related Topics **

Privacy Policy, Terms and Conditions, DMCA Policy and Compliant

Copyright © 2018-2023 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.