Contents
What is the relationship between torque and flux?
For all electric motors, flux and torque are linked together. Torque is proportional to flux and current. The electrical equivalency can only be determined by analysis of the motor design with the aid of equivalent circuits.
What is the relationship between torque and current?
Mechanical or load torque is proportional to the product of force and distance. Motor current varies in relation to the amount of load torque applied. When a motor is running in steady state, the armature current is constant, and the electrical torque is equal and opposite of the mechanical torque.
What is the relationship of torque to flux and frequency?
The torque developed on motor shaft is proportional to the strength of the rotating flux. The type and the amount of magnetic material used in motor construction are factors to define motor power rating. With constant supply power frequency, higher voltage causes higher V/Hz ratio and higher flux.
What is the relationship between current draw and motor torque?
The increase in the torque on the motor shaft results in the linear increase in the armature current. It is also shown in the equation (8) from the previous tutorial. The current function I, depending on the torque M, shows that more current flowing through the motor will produce a higher torque.
How do you convert torque to current?
How to calculate torque of motor:
- Torque is nothing but a momentary force developed at the time of force is applied to the motor. The unit of torque is N.m (Newton-meter).
- T = V x I x pf / (2 x pi x N(rpm) / 60)
- I => Input AC Current in amps.
What is the difference between torque and current?
Torque current is the portion of the total current to the motor that is in phase with the output voltage. Flux current, simplistically described, is the portion of the total current which magnetizes the motor. The efficiency of any motor will improve if more of the total current is in phase with the output voltage.
Does current affect torque?
In general for permanent magnet motors the torque produced will be proportional to the current flowing through armature and the no-load speed will be proportional to the voltage.
What is the sum of torque and flux?
It is said that vector sum of flux and torque current equal to total current drawn by the motor but there are also some currents flowing due to copper losses and rotor leakage inductance. In my opinion, the total current must equal to vector sum of core losses current + torque current and rotor leakage inductance current + flux current ?
The torque is the product of the flux and the torque-producing current, i.e. the component of current which is in phase with the voltage. In DC motors and AC induction motors, the magnetising current is usually constant regardless of torque, unless a special energy-saving control is applied at reduced torque.
How is the torque of an AC motor determined?
Motor current. In an AC motor without a permanent magnet, the flux amplitude is set by the ratio of the applied voltage to the frequency. The torque is the product of the flux and the torque-producing current, i.e. the component of current which is in phase with the voltage.
What causes the flux current in an induction motor?
The magnetizing current or “flux current” is “imaginary current” in AC circuit analysis terminology. The rotor and stator leakage inductance cause voltage drops rather than additional current.