Service Factor Electric Motor Wiki

For example according to the table if you have a 1HP motor and you operate it at. The AC motor commonly consists of two basic parts an outside stator having coils supplied with alternating current to produce a rotating magnetic field and an inside rotor attached to the output shaft producing a second rotating magnetic field.

Linear Motor Motor Linear Ultrasonic

In general one of the three criteria will be the controlling influence in gear drives.

Service factor electric motor wiki. Dabei sind auch mehr als 100 der Nennleistung mglich hier kommt der Service Factor SF ins Spiel. A motor operating continuously at a service factor greater than 1 will have a reduced life expectancy compared to operating at at its rated nameplate horsepower. An induction motors rotor can be either wound type or squirrel-cage type.

Was ist der Service Factor. The service factor is the amount of overload capacity that any motor has. Refer to the National Electrical Manufacturers Association table or NEMA table for service factors.

The service factor is defined as the minimum ratio between calculated capacity and average transmitted load for any component of the system. The service factor SF of an AC motor is a measure of continuous overload capacity at which a motor can operate without overload or damage provided the other design parameters such as rated voltage frequency and ambient temperature are within the manufacturers specifications. NEMA Service Factor at Synchronous Speed rpm for drip proof motors.

I see a lot of OEMs here in the US use the Service Factor rating of the motor as a way of fudging on applications where they need a little more HP than the nameplate rating at a given speed and yet NEMA MG-1 says specifically that they cant. The standard which defines the service factor for motors and generators is the MG-1 standard which in turn defines powers and speeds. Er wurde von der US-amerikanischen National Electrical Manufacturers.

That would mean that the bearings and shaft are properly sized to operate at these horsepower levels without any adverse effects on their life. For example if there is a service factor of 125 it means that the motor can deliver 25 more than the rated horsepower without hurting the integrity of the windings. Synchronous motors contain multiphase AC electromagnets on the stator of the motor that create a magnetic field which rotates in time with the oscillations of the line current.

Dasselbe trifft zu wenn die Drehzahl ber den optimalen Bereich hinausgeht. The rotation period is exactly equal to an integral number of AC cycles. A multiplier which when applied to rated power indicates a permissible power loading that may be carried under the conditions specified for the service factor.

Motor Service Factor SF is the percentage of overloading the motor can handle for short periods when operating normally within the correct voltage tolerances. The nomenclature of service factor on an electric motor nameplate is designated by SF. Aside from possibly setting the motors overloads and possibly re-sizing the cables supplying power to the motor the next biggest concern is the additional heat generated by the motor.

When selecting gears two major areas to consider are the service factor and type of drive to be employed. June 26 2014 by Electric Motor. An induction motor can therefore be made without electrical connections to the rotor.

Darunter verbraucht der Motor im Verhltnis zur erbrachten Leistung mehr Strom seine Effizienz sinkt. Motors Generators defines service factor as. I take the stand that the SF only allows for temporary variations in line voltage or brief load fluctuations but the continuous rating remains just as shown on.

The service factor of an AC motor is a multiplier which when applied to the rated horsepower indicates a permissible horsepower loading which may be carried under the conditions specified for the service factor see 1437. I think that a higher service factor indicates that the motor is mechanically able to run at 115 or 125 of nameplate horsepower. The rotor magnetic field may be produced by permanent magnets reluctance saliency or DC or AC electrical windings.

As per the standards a motors nameplate should indicate the service factor as SF. A synchronous electric motor is an AC motor in which at steady state the rotation of the shaft is synchronized with the frequency of the supply current. Service factors will vary for different motors and for different speed.

This is practical as it gives you some fudge in estimating horsepower needs and actual running horsepower requirements. Three-phase squirrel-cage induction motors. An AC motor is an electric motor driven by an alternating current.

Service factor is a multiplier which when applied to the rated horsepower gives the allowable horsepower loading the machine is capable of delivering without causing significant damage to the unit. An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. The table relates service factors to hp and revolutions per minute or RPMs.

The NEMA National Electrical Manufacturers Association standard service factor for totally enclosed motors is 10. These are failures due to tooth surface pitting wear or physical. Likewise for each power and speed the MG-1 standard defines a frame number which is linked to the service factor.

NEMA Standard MG 1-2014. Calculate or determine your service factor by choosing the service factor that corresponds to your hp and various RPM levels. Less common AC linear motors.

Function Mathematics Wikipedia The Free Encyclopedia Physics And Mathematics Mathematics Math Symbols

Ac Induction Motors Vs Permanent Magnet Synchronous Motors Empowering Pumps And Equipment

Motor Service Factor Sf Defined By Nema

Ac Motor Wikiwand

Understanding Electronically Commutated Motors

Simple Car Engine Parts Names With Pictures Starter Engine Wikipedia Car Alternator Car Insurance Simple Cars

Common Industrial Motor Types Energy Efficiency Center Oregon State University

Marine Engines Engineering Used Trucks Marine

Electric Motor Wikipedia The Free Encyclopedia Electric Motor Electrical Motor Electricity

Maxflow 3 Phase Alternator Mounted With 1 2 Hp Electric Motor Youtube Free Energy Generator Free Energy Projects Car Alternator

Understanding Electronically Commutated Motors

Service Factor

This Is Called Nema Design B Motor The Nema Design B Motor Is The Basic Integral Horsepower Motor It Is A Three Phase Mot Induction Electric Motor Cool Stuff

Motor Service Factor Sf Defined By Nema

Dc Motor Dc Gear Motor Basics Isl Products International Ltd

Motor Service Factor Power Analysis Electrical Engineering Consultants

1 2 Hp Dual Voltage Single Phase Motor Rebuild Electrical Projects Motor Rebuild

Chinacoal03 Gmw 1002 Mini Air Compressor Gmw 1002 Mini Air Compressor Mini Air Compressor Gmw 1002 Air Compre Engineering Design Industrial Machine Induction

How To Rewind An Electric Motor 14 Steps With Pictures