What is Ward Leonard speed control method?
Ward Leonard method of speed control is used for controlling the speed of a DC motor. This variable voltage is obtained using a motor-generator set which consists of a motor M2 (either AC or DC motor) directly coupled with the generator G. It is a very widely used method of speed control of DC motor.
How many machines does the Ward Leonard system employee for speed control?
Maintainance is more as of three machines. Lare floor area is required to implement the speed control method. The use of three machines increases the losses and driving noise.
How does a Ward Leonard speed control system operate to slow down a motor?
Question: How does a Ward-Leonard speed control system operate to slow down a motor? When the generator voltage decreases, the motor’s back-emf is delivered to the generator as it slows down.
What are the machines used in Ward Leonard method?
The Ward Leonard Method of speed control system consists of the main motor (M1), DC generator (G), and controlled DC motor (M2). The power supply is fed to the armature terminal of the dc machine as well as the shunt field point.
What Leonard control is basically a control method?
Detailed Solution. Ward-Leonard method of speed control is achieved by varying the applied voltage to the armature. Hence it is basically an armature voltage control method.
Is Ward Leonard method a field control strategy or armature control strategy of speed control?
Ward Leonard Method of Speed Control is combined armature and field control and is therefore, operationally the most efficient method of speed control with a wide range.
What is the use of Ward Leonard system which parameter is changed to change the speed?
Basic concept. The key feature of the Ward Leonard control system is the ability to smoothly vary the speed of a DC motor, including reversing it, by controlling the field and hence the output voltage of a DC generator, as well as the field of the motor itself.
In what Leonard method of speed control of DC motor change in speed of motor is obtained by the?
ward-leonard method
Introduction. In the ward-leonard method, the speed control of D.C. motor can be obtained by varying the applied voltage to the armature. In this method M is the main D.C. motor whose speed is to be controlled, and G is a separately excited D.C. generator which is driven by a 3-phase induction motor.
In what Leonard method of speed control of dc motor change in speed of motor is obtained by the?
What is meant by Ward Leonard system?
: a regenerative electrical system by which variations in motor speeds for all loads carried by a motor are obtained without rheostatic losses in the main circuit.
How armature and field speed control is achieved in Ward Leonard system?
In the ward-leonard method, the speed control of D.C. motor can be obtained by varying the applied voltage to the armature. In this method M is the main D.C. motor whose speed is to be controlled, and G is a separately excited D.C. generator which is driven by a 3-phase induction motor.
How is the speed of a Ward Leonard motor controlled?
Basic connection diagram of the Ward Leonard speed control system is shown in the figure below. The speed of motor M 1 is to be controlled which is powered by the generator G. The shunt field of the motor M 1 is connected across the DC supply lines. Now, generator G is driven by the motor M 2.
Which is a feature of the Ward Leonard method?
The best feature of Ward-Leonard Method is that we can obtain speed below and above the base / rated speed of DC Motor M. For speed above base speed, the filed current of DC Motor M is varied and for speed below base speed, terminal voltage Vt of DC Motor is changed by varying the field current of DC Generator.
When to use a Ward Leonard DC drive?
The Ward Leonard drives are used where smooth speed control of the DC motors over a wide range in both the directions is required. Some of the examples are as follows: Nowadays Static Ward Leonard system is mostly used.
How is the Ward Leonard flywheel method used?
A modified Ward Leonard method known as the Ward Leonard-Ilgner method which uses a flywheel reduces fluctuations due to sudden change in load demand. When the motor back emf becomes greater than the generator emf, electrical power flows back from the motor to the generator which enhances the overall efficiency of the system.