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Does a single phase motor heat up more than a three phase motor?
Wiki User
∙ 12y ago
No, the motor manufacturer maintains a specific temperature range for motors to operate in. It is usually 40 degrees C. The frame design and cooling fan on the motor shaft keeps the motor operating at a temperature within the manufactures specifications. This is regardless of whether the motor is single phase or three phase.
Wiki User
∙ 12y ago
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Which type of motor is used in heat convector?
The fan in a convector is usually a single-phase induction motor.
What will happen if dc supply given to a single phase ac motor?
There actually is no such thing as 2 phase. You either have single phase (As most/all residential services), or three phase (primarily in commercial/industrial). When a normal three phase motor 'loses a phase' (blown fuses, open winding, bad contactor, etc...) if it continues to operate, it is considered 'single phasing'. While such operation is typically only briefly. (They usually don't run long) While it probably will not operate very long, the motor would over heat, and loose speed rapidly, and they will sometimes make noise. If you need to operate a three phase motor on residential service, you will need a 'three phase converter' (some people call them 'inverter's) to electronically convert single phase power into three phase, but they are usually only practical for smaller three phase motors.
Why Single phase induction motor produces more noise as compaired to three three phase?
Never heard of this before. Any noise that comes from a motor is usually produced by faulty bearings, loose end bells or cooling fan becoming loose from the armature shaft. When a bearing fails the armature is allowed to drag on the stator and this produces noise and heat with motor winding failure not far behind if left unchecked. The overload protection should trip to try and save the motor but constant resetting will finally do the motor in.
Why would electric cost more on a three phase system as compared to a two phase system?
Three phase electricity, per watt delivered, is cheaper than single phase. This is because you can deliver the power to an electrical appliance over three "power lines" instead of one. For example, if you tried to operate a 5 hp ac electric motor on single phase it would require 3730 watts for continuous operation and quite a bit more for start up. A 12 gauge standard wire is only rated for 2700 watts. The more current that runs thru a wire the hotter it gets. The hotter it gets the more the resistance (ohms) goes up. Resistance in a wire is pure waste in terms of electrical cost since you are paying to convert electricity to heat. The same motor run on 12 gauge 3-phase wiring would only deliver 1243 watts per electric line to run the 5 hp motor. Also for motor use, three phase is much smoother and "torquier" than single phase since the power pulses to the field magnets is matched far better than in the single phase. For a visual on this see the website description below: = Wikipedia: Three-phase electric power =
Explain the concept of single phasing?
Single phasing is an unwanted condition where one phase in a three-phase power system is missing, due to a tripped breaker or other condition. With just two lines hot, there is no phase rotation and thus the power delivered to the load is single-phase. This is very bad for most three-phase loads, especially motors. While a lightly loaded motor will continue to turn, it will be with reduced speed and power. Most moderately loaded motors will stall, but continue to draw current. The current does nothing but produce heat, eventually burning up the motor. This is such a problem that special devices have been designed to detect the phase-loss condition and disconnect all lines automatically to avoid damage.
What will happened if one phase loss in three phase motor?
The motor will hum and act like it is trying to run it's commonly known as single phasing, it will also heat up quite rapidly and if you set up your circuit correctly and have the proper thermal overload protection on it it will trip and protect the circuit and the motor. If the problem is in the motor winding you will have to rewind the motor or replace it
Can 3 phase induction motor work when one phase is failed?
yes the motor will rotate but less then the rated speed and more heat will be desipated
What is the purpose of running overload protection for a three phase motor?
An electrical circuit is designed to carry a certain amount of energy, or voltage. The flow of energy, called a current, should travel through the path from one point to the other unimpeded. If that current is interrupted, it causes what is commonly known as a short circuit. If an electrical system is designed properly, overload protection kicks in to stop the flow of energy until the source of the interruption is removed.
What is the impact of phase imbalance in electrical load?
Unbalance in three phase system puts quite a negative impact on the system and the three phase loads like motor. Motors tend to draw additional current for same power output, may increase noice, may increase heat generation.Over all losses go up in the system
Does a run capacitor with a single phase motor generate a lot of heat?
It certainly gets warm, but it is designed to cope with it -ensuring that, under normal circumstances, the resulting temperature doesn't rise above a point where harm can be done.
What three phase changes require the addition of heat?
I think melting, condensation and Sublimination.
How can a single phase motor be rotated clockwise and then anticlockwise without any delay?
It can't, this is called plugging. The motor should come to a complete stop before reversing its direction. The heat build up in the rotor becomes excessive when plugging and should be used with discretion.See related links below.
