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Ward-Leonard system of system of speed control is not recommended for
- a)constant speed operation
- b)Wide speed
- c)frequent-motor reversed
- d)very slow speed
Correct answer is option 'A'. Can you explain this answer?
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Ward-Leonard system of system of speed control is not recommended fora...
Ward-Leonard system of system of speed control is not recommended for constant speed operation.
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Ward-Leonard system of system of speed control is not recommended fora...
Explanation:
The Ward-Leonard system of speed control is not recommended for constant speed operation. This is because the Ward-Leonard system is primarily designed for wide speed control applications and is not efficient for constant speed operation.
Reasons:
1. Complexity: The Ward-Leonard system is a complex system that involves the use of a motor-generator set to control the speed of the motor. This complexity makes it difficult to maintain a constant speed, as any variation in the load or input voltage can affect the output speed.
2. Inefficiency: The Ward-Leonard system operates by controlling the field current of the motor-generator set to adjust the output voltage and hence the speed of the motor. This method of speed control is not efficient for constant speed operation, as it results in significant power losses due to the conversion of electrical energy to mechanical energy and back to electrical energy.
3. Slow response: The Ward-Leonard system has a slow response time due to the mechanical nature of the motor-generator set. This slow response time makes it difficult to maintain a constant speed, especially in applications where quick changes in speed are required.
4. Incompatibility with frequent motor reversal: The Ward-Leonard system is not suitable for applications that require frequent motor reversal. This is because the system relies on the generation of a DC voltage to control the speed of the motor, and reversing the direction of rotation requires reversing the polarity of the DC voltage, which is not easily achieved in the Ward-Leonard system.
5. Limitations at very slow speeds: The Ward-Leonard system may experience limitations at very slow speeds, as the motor-generator set may not be able to provide sufficient torque to overcome the static friction of the load. This can result in unstable operation and difficulty in maintaining a constant speed.
In conclusion, the Ward-Leonard system of speed control is not recommended for constant speed operation due to its complexity, inefficiency, slow response time, incompatibility with frequent motor reversal, and limitations at very slow speeds. It is more suitable for wide speed control applications where precise control and quick response are not critical factors.
The Ward-Leonard system of speed control is not recommended for constant speed operation. This is because the Ward-Leonard system is primarily designed for wide speed control applications and is not efficient for constant speed operation.
Reasons:
1. Complexity: The Ward-Leonard system is a complex system that involves the use of a motor-generator set to control the speed of the motor. This complexity makes it difficult to maintain a constant speed, as any variation in the load or input voltage can affect the output speed.
2. Inefficiency: The Ward-Leonard system operates by controlling the field current of the motor-generator set to adjust the output voltage and hence the speed of the motor. This method of speed control is not efficient for constant speed operation, as it results in significant power losses due to the conversion of electrical energy to mechanical energy and back to electrical energy.
3. Slow response: The Ward-Leonard system has a slow response time due to the mechanical nature of the motor-generator set. This slow response time makes it difficult to maintain a constant speed, especially in applications where quick changes in speed are required.
4. Incompatibility with frequent motor reversal: The Ward-Leonard system is not suitable for applications that require frequent motor reversal. This is because the system relies on the generation of a DC voltage to control the speed of the motor, and reversing the direction of rotation requires reversing the polarity of the DC voltage, which is not easily achieved in the Ward-Leonard system.
5. Limitations at very slow speeds: The Ward-Leonard system may experience limitations at very slow speeds, as the motor-generator set may not be able to provide sufficient torque to overcome the static friction of the load. This can result in unstable operation and difficulty in maintaining a constant speed.
In conclusion, the Ward-Leonard system of speed control is not recommended for constant speed operation due to its complexity, inefficiency, slow response time, incompatibility with frequent motor reversal, and limitations at very slow speeds. It is more suitable for wide speed control applications where precise control and quick response are not critical factors.
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