Question

A brushed DC motor is used to pull up a load as shown in the figure below. The specifications of the above system are: - Motor Specifications: - No-load speed = 1200 RPM - Stall torque = 1 Nm - Torque constant = 0.2 Nm/A - Consider the motor to be ideal in all other aspects - Assume the motor is simply powered by an ideal voltage source - System & load specifications - Pulley effort arm = 0.1m - Mass of the Load = 0.2 kg - Acceleration due to gravity = 10 m/s2 - Assume the string to be sufficiently long For the above system: - What would be the speed at which the motor pulls up the load in steady state? - What would be the current drawn by the motor in steady state? - Before reaching the steady state, what would the profile of current drawn look like? (Assume non-zero coil resistance; Actual values not needed, just the shape of the graph is sufficient)

Answer 1

Answer:

Time Definition: The radius of gyration of a body rotating about an axis is defined as the distance between the axis of rotation and the point at which the entire mass of the body can be supposed to be concentrated so as to give the same moment of inertia as that of the body about the given axis.

Answer 2

Answer:

Rotation around a fixed axis or about a fixed axis of revolution or motion with respect to a fixed axis of rotation is a special case of rotational motion. The fixed-axis hypothesis excludes the possibility of an axis changing its orientation and cannot describe such phenomena as wobbling or precession