The type of DC motor used for shears and punches is
A. Series motor.
B. Shunt motor.
C. Cummulative compound motor.
D. Differential compound motor.
Show Answer
Answer: C
Share your understanding of this question with the correct explanation.
The type of DC motor used for shears and punches is the cumulative compound motor.
Shears and punches are typically heavy-duty applications that require high starting torque and the ability to handle intermittent high loads. The cumulative compound motor is well-suited for such applications due to its specific characteristics.
A cumulative compound motor combines the features of a shunt motor and a series motor. It has both a shunt field winding and a series field winding. The shunt field winding provides good speed regulation and helps maintain a nearly constant speed under varying load conditions. The series field winding, on the other hand, enhances the starting torque and provides additional torque during heavy loads.
For shears and punches, the cumulative compound motor is preferred because it can deliver the high starting torque required to initiate the cutting or punching action. Additionally, it can handle the intermittent high loads encountered during the operation of these machines.
Therefore, the correct answer is C: Cumulative compound motor. The cumulative compound motor is used for shears and punches due to its high starting torque and ability to handle intermittent high loads.