Siemens High Low Voltage AC Motor

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part name	brand	model		Voltage	protection	cooling
motor	Siemens	1LA8	1PQ8	400V,690V,2.3KV,4.16KV,6KV	IP55	IC411 (1LA8,1LA4)
						IC416 (1PQ8,1PQ4)

Siemens High Low Voltage AC Motor

Q:Its design for a 20second operation. Pass decades, it working perfectly ok. However, lately, sometime after an operation, it rotate the other way, and then for the next turn, it rotate perfectly again... :(: You have a worn winding. As the arm holding the worn winding rests in exactly the wrong place, the arm behind it holds a greater magnetic potential and so the motor goes into reverse. if it bothers you, you will need to replace or rebuild.

Q:how does a synchronous ac motor work? please help!!!: A okorder /

Q:got an idea that i want to play with involving a small electrical motor. I want to know if i must increase the voltage or ampere to increase the speed since it doesnt have controls for that: An AC motor running with 60 Hz will rotate at 60 RPS or 3600 RPM, but this is for a motor with a single pair of poles. The formula is 3600/#-pair-poles. Many have two poles so they will rotate at 1800 RPM. That is for Synchronous motors. Big motors like the ones on AC units are Asynchronous, here there is a displacement so an 1800 RPM motor will run at ~1750 RPM. Now, if you are referring to DC motors, there are two types, series and parallel. The RPM on a series one will depend on the voltage applied and the load. I have to admit that I don't remember what happens on a parallel one, may be I never learned it right. When you apply a Voltage and the motor is under load, it will draw so many Amps. So, Amps is a consequence of the electric power needed to overcome the mechanical power. Most DC motors have commutators and brushes, the RPM also depends on how many contacts on the commutator. The reason for the commutator is to reverse the magnetic field every fraction of a revolution, such that the motor will rotate. The so called brush-less DC motors don't have commutators, they are equipped with transistor-switching that do the job of commutation.

Q:What's the difference between a DC motor and an AC motor?: Alternating current motors are divided into stator windings and rotor conductors. The rotor conductor is shaped like a silicon steel sheet between a cage and a conductor. Some of the AC motors also have windings

Q:I need to know how to basically look at an electric motor (either salvaged or new) and be able to tell what rpms it can achieve, what torque it is capable of delivering/withstanding, and what voltage requirements are needed in order to speed up/slow down/optimize performance. Also, is there a way to distinguish whether it is AC or DC? Take as much space as piossible in order to explain this and/or provide links. I really want to learn as much as i can about all different aspects of applying electric motors to designs.: Looking okorder for more info.

Q:Why are DC motors more powerful than AC motors of the same power?: In order to limit the starting current, a specially designed variable resistor is often inserted into the armature circuit. In the starting process, as the speed continues to rise, each segment resistance is shorted in time, so that the starting current is limited to a certain allowable value. The working principle and starting method of this kind of DC motor is called series resistance starting. It is very simple and easy to use. It is widely used in various medium and small DC motors. However, due to the large energy consumption during starting, it is not suitable for motors that are frequently started and medium and large DC motors. But for some special needs, for example, city buses are often started. In order to simplify equipment, reduce weight and facilitate operation and maintenance, it is usually adopted serial resistance starting method.

Q:An old folk told me that with his 18 years working experience, that increase in ambient temperature (above 40C) will cause an AC motor to lower its RPM......True?? Please advise.....: It is true that an increase in ambient temperature will cause an induction motor's speed to decrease in the absence of other influencing factors such as voltage change and load change. An induction motor's speed is the speed of the rotating magnetic field minus the motor's slip. Temperature is one of several factors that influences the motor's slip. Most of the speed change takes place when all of the parts of the motor are at room temperature before power is applied. As the motor comes up to its normal operating temperature, the temperature of the motor’s rotor can increase from 25C to 100C and the full-load speed could go down by 6 RPM or so. If the ambient temperature increases from 25C to 45C, the speed might go down another 2 RPM. In most situations, it would be difficult to detect such a small speed change, or to know that the speed change was not caused by a voltage change or load change. However, such changes are readily apparent when running dynamometer tests in a laboratory. Most of the speed change is due to increase in rotor resistance with temperature.

Q:Hi, can someone please explain why measured mechanical power might be considerably lower than the value calculated using Rr and Xr?(in a 3 phase induction motor)Thanks for your help!: In any motor the measured mechanical power is always lower then calculated power because of losses such as copper losses, iron losses and friction.

Q:I am doing a paper on Nikola Tesla and i know he invented this and i know it is important, but why?: You will see single phase AC induction motors used mainly in the residential environment where 3-phase power is not available or is too expensive. Uses of such motors are: air compressors, log splitters, press, refrigerators, air conditioner, single phase industrial machines, pressure washer, etc.... You can purchase single phase motors up to 15 horsepower. Also, AC motors are more powerful than combustion engines, but you do not see many high horsepower single phase AC induction motors used in the home because the 230 volt circuit is not commonly used in the home except for the stove, hot water heater, or air conditioner. The motors are mostly limited to 115 volt circuit, which limits horsepower to about two. So combustion engines are used more often for the big jobs, where as the small jobs are left to the AC motors.

Q:What is the highest 120 volt electric motor on the market. Are they small 1/2hp to 3hp or can you buy them at 15-20 hp.: 5 horsepower is about the limit for 120 VAC as most house wiring is not up to such a real load. The ratings on vaccum cleaners not withstanding. it is easier to make the motors for 240 VAC, and house wiring can handle the current load more readily. In general, figure 6.5 to 7.5 amps per horsepower for a realistic rating on 120 VAC. Vaccum cleaners claim higher horsepower- but their numbers are usually based on the point where the motor burns out. Few houses have 8 gauge or 6 gauge wire coming from the service panel unless spec'd for it and those would be needed to modest runs to a 5 Horse 120VAC, whereas a 5 horse on 240VAC can run safely up to a point on 10 guage wire.

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