What are the factors on which torque developed in the armature depends?
1 Answer. Torque developed by a D.C. motor depends upon magnetic field, active length of the conductor, current flow through the conductors, number of conductors, radius of armature.
What are the factors affecting torque in dc motor?
Input Voltage: For a fixed load, the speed of the motor is affected by the applied voltage. Increase in voltage = increase in speed. Load Torque: For a fixed voltage, the speed of the motor is inversely affected by the load. Increase in load torque = decrease in speed.
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.
How the torque is developed by a DC motor on which factor does it depend?
Since the torque developed in a DC motor is dependent upon the interaction of armature and field fluxes, torque increases by the square of the value of current increase. Therefore, a series motor will yield a greater torque increase than a shunt motor for a given increase in current.
Which DC motor is preferred for constant speed?
Explanation: Rotary compressor generally demand constant speed operation throughout the load. Sometimes, DC machines are not able to produce constant speed throughout the process hence, synchronous machine is used. 4.
What are factors that determines a 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.
How do you control speed and 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.
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.
What is torque in a DC motor?
Torque equation of a DC motor
When armature conductors of a DC motor carry current in the presence of stator field flux, a mechanical torque is developed between the armature and the stator. Torque is given by the product of the force and the radius at which this force acts.
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 determines the speed regulation of a DC motor?
The speed regulation of a DC motor is proportional to the resistance of the armature. The lower the armature resistance the better the speed regulation. The reason for this is that armature current determines the torque produced by motor if field excitation remains constant.
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 the formula of shaft torque of DC motor?
and N is the speed of the DC motor. Substituting equation (6) and (7) in equation (4), we get: The torque we so obtain, is known as the electromagnetic torque of DC motor, and subtracting the mechanical and rotational losses from it we get the mechanical torque.
What is the principle of torque generation in a DC machine?
Explanation: The electromagnetic torque generated in the dc generator is in the direction in which the prime mover is rotated.It is produced due to the action of armature current and stator field. Explanation: It is due to the fact that no field poles are induced in PMDC to create magnetic flux leading to harmonics.
Which is proportional to the torque in dc motor?
1 Answer. The torque, in a DC series motor is proportional to the square of the armature current.