Mechanical Equipment of Federal Buildings Under the Control of the Treasury Dep
Mechanical Equipment of Federal Buildings Under the Control of the Treasury Dep
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0 88 ISOO 78. 5 80. 5 Methods of Speed control for direct-current motors. 1. Armature Control, or regulation of the voltage at the brushes by means of an adjustable resistance in series with the armature. Recommended for some service in which speeds lower than normal are desired as in controlling the speed of fans, blowers, centrifugal pumps, etc.
2. Field Control, or regulation of the field strength by means of an adjustable resistance in the shunt field circuit. Hecommended for service in whi...ch speeds higher than normal are desired, as in operating machine tools.
Armature control. With constant torque, the motor current is constant regardless of the speed. Therefore every change in the controlling resistance in armature control produces a corresponding change in voltage drop in the resistance and a like effect on the motor speed. Moreover, the motor speed remains constant at any adjust- ment. The motor output is proportional to the product of the torque and speed, and the former remaining constant, the output must vary with the speed.
What to read after Mechanical Equipment of Federal Buildings Under the Control of the Treasury Dep?
You can find similar books in the "Read Also" column, or choose other free books by Nelson Scoville Thompson to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
0 88 ISOO 78. 5 80. 5 Methods of Speed control for direct-current motors. 1. Armature Control, or regulation of the voltage at the brushes by means of an adjustable resistance in series with the armature. Recommended for some service in which speeds lower than normal are desired as in controlling the speed of fans, blowers, centrifugal pumps, etc.
2. Field Control, or regulation of the field strength by means of an adjustable resistance in the shunt field circuit. Hecommended for service in whi...ch speeds higher than normal are desired, as in operating machine tools.
Armature control. With constant torque, the motor current is constant regardless of the speed. Therefore every change in the controlling resistance in armature control produces a corresponding change in voltage drop in the resistance and a like effect on the motor speed. Moreover, the motor speed remains constant at any adjust- ment. The motor output is proportional to the product of the torque and speed, and the former remaining constant, the output must vary with the speed.
What to read after Mechanical Equipment of Federal Buildings Under the Control of the Treasury Dep?
You can find similar books in the "Read Also" column, or choose other free books by Nelson Scoville Thompson to read onlineMoreLess
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