What are the advantages of armature voltage control method?

Additional advantages of armature controlled DC motors include: Constant field current and torque: With the armature control method, the field current and torque levels remain constant throughout the application. Regardless of the speed of the motor, you can rely on these factors.

What is the major drawback of armature voltage control method?

The main disadvantages of the above method is, the speed up to zero is not possible as it requires a large rheostat in series with the armature which is practically impossible.

What are the disadvantages of armature resistance control?

Drawbacks of armature resistance control method: A large amount of power is wasted in the external resistance R and hence less efficient. It is restricted to keep the speed below the normal speed of the motor and increase in the speed above normal level is not possible.

What are the advantages and disadvantages of flux control method?

Advantages of flux control method: (i) This is an easy and convenient method. (ii) It is an inexpensive method since very little power is wasted in the shunt field rheostat due to a relatively small value of Ish. (iii) The speed control exercised by this method is independent of the load on the machine.

What are the disadvantages of armature reaction?

The adverse effects of armature reaction: Armature reaction weakens the main flux. In case of a dc generator, weakening of the main flux reduces the generated voltage. Armature reaction distorts the main flux, hence the position of M.N.A. gets shifted (M.N.A. is perpendicular to the flux lines of main field flux).

What is the main disadvantage of a series wound generator?

The series motor has poor speed regulation. When the load speed of the machine increases, the DC shunt motor keeps its constant speed from no load to full load. The dc series motor’s Torque drops sharply when the speed increases.

What is the advantage of shunt DC motor armature voltage speed regulation?

SHUNT MOTORS – A shunt motor has its armature and field in parallel or it may have separate field and armature supplies. In either case, this type of motor has good speed regulation (5\% to 10\%) and is capable of delivering 300 percent of its full load torque for a very short period of time.

What are the disadvantages of flux control method?

1. The speed control below normal rated speed is not possible as flux can be increased only upto its rated value. 2. As flux reduces, speed increases.

What are the advantages of Series generator?

Advantages of DC Series Motor: While delivering high torque during an overload, the series motor draws less current and power from the source compared to a shunt or compound DC motor. The main applications where series motors are best suited are for traction applications.

What is shunt advantages and disadvantages?

It has poor efficiency for large load currents. It has high output impedance. The output DC voltage is not absolutely constant because both VBB and VZ voltages decrease with increase in room temperature. The DC output voltage cannot be changed easily as no such means is provided.