Characteristics of DC motors
• DC motors have good starting torque as well as good speed-regulation capabilities.
• Permanent magnet-type DC motors are used for exact positioning of objects with high-operating torques.
• Series type gives high-starting torque; hence the ability to start with high loads.
• Series motors when operated with no loads can attain high speeds causing harm to motor.
• Shunt-type motors have good speed regulation.
• Direction reversal of DC motor can be done by changing the leads of the armature or the field.
• Speed of DC motor changes either by changing armature voltage or field current.
• If armature voltage is increased, speed increases till base speed and vice versa.
• Similarly, speed can be increased above base speed, by decreasing field current.
• In shunt motors torque is proportional to armature current.
• In series motors torque is proportional to square of armature current.
• DC motors have good starting torque as well as good speed-regulation capabilities.
• Permanent magnet-type DC motors are used for exact positioning of objects with high-operating torques.
• Series type gives high-starting torque; hence the ability to start with high loads.
• Series motors when operated with no loads can attain high speeds causing harm to motor.
• Shunt-type motors have good speed regulation.
• Direction reversal of DC motor can be done by changing the leads of the armature or the field.
• Speed of DC motor changes either by changing armature voltage or field current.
• If armature voltage is increased, speed increases till base speed and vice versa.
• Similarly, speed can be increased above base speed, by decreasing field current.
• In shunt motors torque is proportional to armature current.
• In series motors torque is proportional to square of armature current.
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