In DC motors, field and armature flux do that each acting at different angles like say 90 degrees. Likewise in induction motors, Torque depends on stator and rotor flux generated by stator and induced rotor current alongwith sine of the angle between them.
What are the factors affecting torque?
Examples: Page 5 Torque is Determined by Three Factors: The magnitude of the applied force. The direction of the applied force. The location of the applied force.
What two factors determine the amount of torque developed by a DC motor?
What two factors determine the amount of torque developed by a DC motor? The strength of the magnetic field in the armature, and the strength of the magnetic field in the poles.
What are the factors that affect the speed of dc motor?
Factors Affecting The Speed Of A D.C. Motor
- The flux Φ
- The voltage across the armature.
- The applied voltage V.
How do you increase the torque of a DC motor?
If you want to adjust the output torque within the rated torque range, you can usually adjust the input voltage or the amount of excitation current. If the DC motor has been set, the torque can only be increased by the speed reducer, which can be multiplied or even increased by a thousand times.
How do I calculate torque?
A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.
Why does torque depend on distance?
At a greater distance from the axis the arc is larger, there is more distance to cover the same angle. … The moment arm affects the force in a torque because a larger moment arm, radius, or perpendicular distance means more distance to cover the same angle of rotation.
What are the two basic types of DC motor connections?
The motor can be connected in two arrangements: cumulatively or differentially. Cumulative compound motors connect the series field to aid the shunt field, which provides higher starting torque but less speed regulation.
What are the rotating windings of a DC motor called?
2, the rotating loops are called the armature of our DC motor (hence the subscript “a” that we have been using). Figure 5: Developed Electromagnetic Torque for Single Loop Machine Page 8 current through the armature.
What is counter torque proportional to?
Counter-torque is proportional to armature current and is a measure of the electric energy produced by the generator. … A device used to convert mechanical energy into electric energy.
What are the two factors controlling the speed of a DC motor?
Factors Affecting The Speed Of Dc Motor
- The applied voltage.
- The flux.
- The voltage across an armature.
How can the speed of a DC motor be controlled?
Thus, the speed of a DC motor can be controlled in three ways: By varying the supply voltage. By varying the flux, and by varying the current through the field winding. By varying the armature voltage, and by varying the armature resistance.
What are the two ways to increase the speed of a DC motor?
The speed of the motor can be increased by:
- increasing the strength of the magnetic field.
- increasing the current flowing through the coil.
How do you increase the torque of a 12v DC motor?
If the speed is to remain constant then the back-emf must also remain constant. Then the only way to increase torque is to increase the armature current and the only way to increase the armature current is to increase the supply voltage. This in effect is how a speed controller works.
How do you control the torque of a DC motor?
- Torque can be controlled directly by controlling the armature current. Fig. …
- In Fig. 10.8a, a phase-controlled rectifier, in combination with a dc-link filter inductor, can be used to create a variable dc-link current which can be applied directly to the armature terminals of the dc motor.
- In Fig.
What is the torque equation of DC motor?
Ka = (PZ/2πa). Since Ka depends upon the constructional design of DC Motor or generator, it is known as armature constant. Here P is number of poles, Z is total number of armature conductor and ‘a’ is the number of parallel paths in armature. Equation (1) is the torque equation for DC machine.