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 between voltage and flux?

So, a change in flux induces a current and a voltage which is proportional to the rate of change of flux. This fits with Ohm’s Law (V = IR). A current and a voltage in a coil induce a flux which is proportional to the current and the voltage.

What is the relation between torque and speed in induction motor?

Torque is inversely proportional to speed. Thus, when speed increases, torque will decrease.

What is the relationship between speed back EMF and flux?

We know, back emf Eb of a DC motor is the induced emf in the armature conductors due to the rotation of armature in magnetic field. This shows the speed of a dc motor is directly proportional to the back emf and inversely proportional to the fluxper pole.

How is torque related to flux and armature current?

Torque vs. We know that torque is directly proportional to the product of armature current and field flux, Ta ∝ ɸ. In DC series motors, field winding is connected in series with the armature, i.e. Ia = If. Therefore, before magnetic saturation of the field, flux ɸ is directly proportional to Ia.

Does torque depend on current?

The increase in the torque on the motor shaft results in the linear increase in the armature current. The current function I, depending on the torque M, shows that more current flowing through the motor will produce a higher torque.

What happens when flux increases?

Since the flux is increasing, the induced field is in the opposite direction, or out of the page. Right hand rule gives the current direction shown, and the polarity of the rod will drive such a current.

What is the relation between flux and inductance?

As the inductance of a coil is due to the magnetic flux around it, the stronger the magnetic flux for a given value of current the greater will be the inductance.

What is the relationship between speed and torque regulation in DC shunt motors?

This second relationship—between speed and load (or torque)—is typically shown on the motor’s torque-speed curve. Of course, the motor constant (k) doesn’t change, and resistance (R) in the motor windings is constant. Therefore, when supply voltage (V) is constant, torque (T) is inversely proportional to speed (ω).

Why is torque inversely proportional speed?

The Reason that Torque and Speed are said to be inversely proportional is the ability to generate torque diminishes with increase speed. The reason for this is because the BackEMF opposes the supply that is attempting to force current into the stator, that will generate EM-Torque.

What is the relationship between flux and speed of the DC shunt motor?

1. Flux control method. It is already explained above that the speed of a dc motor is inversely proportional to the flux per pole. Thus by decreasing the flux, speed can be increased and vice versa.

What is relationship between speed with back emf and flux of DC motor?

Back EMF in practice Back EMF is directly related to speed, so when the speed decreases, so does the induced back EMF. From the equation above, we can see that if there is less back EMF, the voltage (and, therefore, current) across the motor will increase.

How do you calculate torque and flux in a motor?

Because torque equals force times distance, the torque equation can be shown as: Where: T c = torque on one coil. r = distance from center of armature. The flux density, B, equals the total flux divided by area: Where: φ = total flux. Because the motor is essentially a cylinder, area is calculated as:

What is the relationship between flux and speed?

Speed is inversely proportional to flux. So for a lightly loaded motor, if the field is weakened, the motor will run faster. This can be a danger, especially for a large motor. On excitation failure, it may overspeed and damage itself or the connected load.

How many fluxes are there in a DC motor?

Second part of your question, Flux is indirectly proportional to current, that is right and torque equation of DC motor indicates two fluxes, one is field Flux ( proportional to field current) other being armature Flux which is expressed as armature current.

What is the relationship between excitation flux and armature speed?

Equation 1: If the excitation flux is constant, the back-e.m.f. is proportional to the armature speed. Equation 2: If the excitation flux is constant, the back-e.m.f. (and therefore speed) will reduce under increasing load torque.