0
What else can I help you with?
Why dc shunt generator does not have armature resistance?
It does have armature resistance.
What is the range of value of armature resistance in dc motor?
The range of armature resistance in a DC motor typically varies from a few ohms to several tens of ohms, depending on the motor's size and design. Smaller motors may have armature resistances as low as 1-5 ohms, while larger industrial motors can have resistances ranging from 10 to 50 ohms or more. The resistance affects the motor's efficiency and performance, particularly in terms of voltage drop and heat generation during operation.
Why armature resistance is less than 1 Ohm?
why armature resistance is very low as compare to field resistance in dc motor
Why the armature voltage E changes when the field rheostat is varied in shunt motors?
In shunt motors, the armature voltage ( E ) changes when the field rheostat is varied because altering the resistance in the field circuit affects the field current and, consequently, the magnetic flux produced by the field winding. When the field rheostat is decreased, the field current increases, leading to a stronger magnetic field and a higher back electromotive force (EMF) generated in the armature. This results in a change in the armature voltage, as the increased back EMF reduces the net voltage across the armature. Conversely, increasing the field resistance weakens the magnetic field, reducing back EMF and allowing the armature voltage to rise.
What does a armature or rotor do?
The Armature(or rotor) is a electromagnet inside a motor and alters the magnetic field inside the motor when it rotates. In DC motors it is connected to a Commutator. In AC induction motors the armature isn't connected to a power source.
Can we get speeds above rated speed by armature resistance control method?
Yes, speeds above the rated speed can be achieved using the armature resistance control method in DC motors. By increasing the armature resistance, the voltage drop across the resistance can be manipulated, allowing for higher speeds. However, this approach is limited and can lead to inefficiencies, overheating, and reduced torque at higher speeds. Therefore, while it is possible, it is generally not the most efficient or practical method for achieving high speeds.
Why use resistor grids in DC motors?
resistor grids were used in DC MOTORS during dynamic braking. in this method of braking a resistance ( variable) is connected across armature winding so as to dissipiate the energy. the energy thus dissipiated is used for braking of motors.
Why armature winding resistance is less than field winding resistance?
An 'armature winding' is the rotor winding, and the 'field winding' is the stator winding.
What is the formula for armature resistance of shunt excited DC generator?
The armature resistance of a shunt excited DC generator is calculated using the formula ( R_a = \frac{V - E}{I_a} ), where ( R_a ) is the armature resistance, ( V ) is the terminal voltage, ( E ) is the generated EMF (electromotive force), and ( I_a ) is the armature current. The difference between the terminal voltage and the generated EMF accounts for the voltage drop across the armature resistance due to the current flowing through it.
How do you spell amiture?
The correct spelling is armature (wound coil in motors and generators).
In DC motor is the armature plus brushes resistance substantially the same for every rotational position of the armature why?
In a DC motor, the armature resistance and brush contact resistance remain relatively constant across different rotational positions because these components are primarily resistive and do not change with position. The brushes continuously maintain contact with the commutator segments as the armature rotates, ensuring a consistent electrical path. While the inductance and back EMF may vary with position, the resistance itself is a fixed characteristic determined by the materials and design of the armature and brushes. Therefore, the overall resistance remains substantially the same throughout the armature's rotation.
What are the advantages and disadvantages of armature control method?
The advantages of the armature control method include precise speed control of DC motors, effective torque management, and simplicity in implementation. It allows for smooth acceleration and deceleration, making it suitable for applications requiring fine-tuned performance. However, disadvantages include potential inefficiency at low speeds, increased heating due to armature resistance, and limited applicability to AC motors. Additionally, it may require complex circuitry for larger systems, increasing overall costs.
