What is series wound in DC motor?
When the armature windings and field windings are connected in series, the motor is referred to as a “series wound” DC motor. Being connected in series means the current through the armature and the field windings is equal (Itotal= Ia= If), which allows the motor to draw a significant amount of current.
What are the characteristics of a DC series wound motor?
In a series DC motor the field is connected in series with the armature. The field is wound with a few turns of large wire because it must carry the full armature current. A characteristic of series motors is the motor develops a large amount of starting torque.
What is a series field?
Series Field Connection As the armature current of a machine is typically much higher than the field current of a separately excited machine, the field winding in a series machine has fewer turns than the field winding in a separately excited machine. (Remember that mmf is the number of turns multiplied by current).
How can the voltage in a DC generator be increased?
Generators with field coils use DC current to excite a magnetic field in the field coils. Higher excitation current produces a stronger magnetic fields, which in turn increases the output voltage.
What are the two main characteristics of a series motor?
The characteristic curves of a DC series motor are those curves which show relationships between the following quantities.
- Torque and armature current (Ta/Ia characteristic).
- Speed and armature current (N/Ia characteristic)
- Speed and torque (N/Ta characteristic) It is also known as mechanical characteristic.
What is load test on DC series motor?
The load test is conducted by applying a spring balance load to brake drum of machine. By tightening the belt over the pulley different load can be applied. The spring balance reading S1 and S2 are noted and the effective radius ‘r’ of the pulley is measured. The output power can be calculated as P=2πNT/60 Watts.
Where is DC series motor used?
Series DC motors are generally used where high starting torque is required, and speed variations are possible. These types of direct connection motors are, for instance, used in the traction system, cranes, air compressors, vacuum cleaners, sewing machines, etc.
What is the voltage generated by a DC motor?
Typical DC motors may operate on as few as 1.5 Volts or up to 100 Volts or more. Roboticists often use motors that operate on 6, 12, or 24 volts because most robots are battery powered, and batteries are typically available with these values. Operating Current.
What is the voltage equation of a series wound DC motor?
R se is the series coil resistance and R a is the armature resistance. This is the basic voltage equation of a series wound DC motor. Another interesting fact about the DC series motor worth noting is that, the field flux like in the case of any other DC motor is proportional to field current.
What is compound wound DC motor?
Compound Wound DC Motor or DC Compound Motor. A compound wound DC motor (also known as a DC compound motor) is a type of self-excited motor, and is made up of both series the field coils S 1 S 2 and shunt field coils F 1 F 2 connected to the armature winding as shown in the figure below.
What are the interesting facts about the DC series motor?
Another interesting fact about the DC series motor worth noting is that, the field flux like in the case of any other DC motor is proportional to field current. But since here i.e. the field flux is proportional to the entire armature current or the total supply current.
What is speed and torque of series DC motor?
Speed and Torque of Series DC Motor. A series wound motors has linear relationship existing between the field current and the amount of torque produced. i.e. torque is directly proportional to current over the entire range of the graph.