What Happen If The Synchronous Motor Have A Load Continue

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What will happen if the synchronous motor over load?

When a synchronous motor experiences a mechanical load exceeding its pull out torque, it enters asynchronous operation, under which the interaction between the stator and rotor magnetic fields causes damaging mechanical stress and vibrations.

When load of a synchronous motor is running with?

When a synchronous motor is operating with normal excitation, with the increase in load: The motor continues to run at a synchronous speed as it is a constant speed motor. The torque angle δ increases. The excitation voltage Ef remains constant.

When load on a synchronous motor increased?

Explanation: Synchronous Motor on Load: In DC motors and induction motors, when the load increased causes the motor speed decreases. The decrease in speed reduces the counter EMF which causes additional current is drawn from the source to carry the increased load at a reduced speed.

Can a synchronous motor be started with a load on it?

Now the synchronous machine is operating, as a motor, from ac supply mains and dc machine acts as load on it. The synchronous motor can also be started by the exciter mounted on an overhung synchronous motor bracket and shaft extension.

What happens when we increase the load on a synchronous generator?

If we increase the connected load, then there will be automatically incremented in the active power (P) or reactive (Q) of the generator. By increment in the load also increases the value of current that used by the load celled load current (IL).

What causes a motor overload to trip?

Causes may include a large change in load (e.g., a scrap grinder is fed too much at a time), misalignment, a broken drive gear, or improper motor drive settings. Power problems (e.g., low voltage or low power factor) also may cause an overload condition. It’s easy enough to determine the correct size overloads.

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When load on a synchronous motor is increased its power factor tends to?

When load on a normally excited synchronous motor is increased, the motor becomes more and more out of phase and draws more current. Hence its power factor tends to become increasingly lagging.

When load on an over excited or under excited synchronous motor is increased?

Right Answer is: B When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is less and the same can be observed by using v curves as shown below.

What happens when load angle increases?

An increased load angle will cause electromagnetic torque to increase. Since the electromagnetic torque opposes the prime mover torque in synchronous machine, as soon as this torque balances the prime mover torque, the mechanical input will be converted to electrical output.

Why are synchronous motors not started under load?

3.2. Synchronous motors are inherently not able to self-start on an AC power source with the utility frequency of 50 or 60 Hz. As stated in Chapter 1, this is because synchronous motors can develop a torque only when running at the synchronous speed.

How does synchronous motor behave at no load?

A synchronous motor running with no load will lead the current i.e. leading power factor like a capacitor. This synchronous motor running without load i.e. over-excited is synchronous condenser.

When motor runs on no load then?

When the motor is connected across the supply mains without load, it draws small current from the supply mains. This current will flow through the series field and armature, the speed tends to increase so that back emf may approach the applied voltage in magnitude.

Why synchronous motor is need of a starter?

What happens when load on generator decreases?

If a load in a generator decreases i.e., load current decreases. As the load demand decreases, the demand in current decreases, the excitation of the system decreases the density of the magnetic flux by decreasing the current in the generator field. Therefore, if the load decreases, magnetic flux density decreases.

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How do you check motor overload?

Measure the normal motor running current (i motor). Turn off the motor and let it cool for about 10 minutes. Calculate the following ratio: i (motor) / i (overload min FLA). Set the overload to its minimum FLA and turn on the motor. Wait for the overload to trip.

What causes an overload?

Overloads happen when you demand more electricity from a circuit than that particular circuit is designed to handle. That being said, circuits themselves may have different sizes or types of breakers, fuses, wires and outlets or connections. Remember wiring in a circuit is only as good as its weakest point.

When load on synchronous motor is increased its armature current is increased provided it is?

The increase in the torque angle (δ) causes a greater phase displacement of the excitation voltage (Ef) with respect to the supply voltage (V). This increases the result voltage (Er) in the armature winding of the machine. Consequently, the armature current (Ia) increases to meet the load demand as seen from Eqn.

What will happen if a synchronous motor is under Excited?

If the synchronous motor is under-excited, it has a lagging power factor. If the synchronous motor is normally-excited, it has unity power factor. If the synchronous motor is over-excited, it has a leading power factor.

When the excitation of synchronous motor is changed keeping the load constant then the?

The change in DC excitation of a synchronous motor will also change the power factor. If excitation of a synchronous motor running with a constant load is decreased from its normal value, it leads to an increase in both armature current and power factor angle.

What happens to the V curve when a synchronous motor is loaded?

If now, the field current is increased further, the armature current increases and the motor starts operating as a leading power factor. The graph drawn between armature current and field current is known as the V curve. If this procedure is repeated for various increased loads, a family of curves is obtained.

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Why does the speed of a synchronous motor remain constant even under variable load?

This is because the load torque demand increases then the torque produced by the motor. Hence motor draws more current to produce more torque to satisfy the load but its speed reduces. In case of synchronous motor speed always remains constant equal to the synchronous speed, irrespective of load condition.

What will be the effect on synchronous motor When reduce the excitation with keeping constant load?

Under excitation This shiting causes the power factor angle to increase, which means the power factor decreases. To maintain a constant I cos ϕ, the armature current increases. Hence when the synchronous motor is operated in reduced excitation, it draws more current from the supply at the lower lagging power factor.

Why synchronous motor is doubly excited?

A synchronous machine is called a doubly excited machine because both its rotor and stator are excited. To achieve magnetic locking between stator and rotor, double excitation needed. The stator of 3 phase synchronous motor is excited with a 3-phase supply while rotor is with DC Supply.

What happens if the field winding of the synchronous motor is short-circuited?

Let short circuit the two ends of the wire (or connect the two ends of variable resistors). Now the rotor winding of the synchronous motor is analogous to that of an induction motor. Therefore if we short circuit the field winding of a synchronous motor then it will behave as an induction motor.

How can a synchronous motor be self starting?

The synchronous motor is made self-starting by providing a special winding on the rotor poles, known as damper winding or squirrel cage winding. AC supply given to the stator produces a rotating magnetic field which causes the rotor to rotate.

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