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TEMCo offers one of the most extensive ranges of AC motors in the industry. Our offerings includes standard and premium efficient designs through 500 hp, with custom capabilities to 800 hp. No other company offers you the choices that TEMCo does. Whether your application is a pump, fan, conveyor, etc., TEMCo has the right motor.
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AC Motors are an indispensable part of our everyday life from small motors that works our electric clocks to large 50,000 HP electric motors. The AC Motor (alternating current motor) comes in many varieties, but they fall mainly into two categories; synchronous and induction machines. AC motors can operate in two different modes, one being a motor the other a machine. When electrical power causes the device to produce torque, this is a motor. However, when a similar machine receives input rotational power, electricity is produced, and it is an electric generator. Single phase AC motors are usually small machines up to about 5 hp, but larger machines commonly use 3 phase power, and they have superior torque characteristics and simplify the starting process.
How An AC Motor works
All rotating machines have two main sets of windings. The one set of windings is called a stator; it is attached to the motor frame and remains stationary. The other set of windings is mounted on a freely rotating shaft, or rotor. In an AC motor, the stator windings are energized with single-phase or polyphase voltage. A polyphase electric system is where it produces two or more phases of alternating current, or two or more alternating voltages of the same frequency. The current flowing through the stator windings produces a magnetic field, the polarity of which rotates around the center axis of the stator. When these rotor windings are magnetized, pairs of magnetic poles form and the rotor spins to keep the rotor poles aligned with the stator field. The number of poles determines the speed of the rotor. The motoring process is reversed when the similar machine is used as a power generator.
Types of AC Motors
Synchronous AC Motors
As we mention above AC motors come in many varieties, but they fall into two different categories; synchronous and induction machines, each used in many different applications. Synchronous motors are usually constant-speed motors and many generators and large motors are categorized as synchronous machines. A synchronous AC motor works by the rotor turns at the same speed as the stator field. This type of AC motor is used when precise controlled is needed for speed or frequency. The synchronous design lends itself to large devices. In large horsepower sizes applied to industrial loads, these synchronous AC motors serve two important functions. First, it is a highly efficient means of converting AC energy to mechanical power. Second, it can operate at leading or unity power factor, therefore, providing power-factor correction. There are two major types of synchronous motors, the nonexcited and the DC-excited motors. The nonexcited motors which are designed in reluctance and hysteresis, employs a self-starting circuit and requires no external excitation supply. The DC-excited motors come in sizes larger than 1 hp, and require direct current, which is supplied through slip rings for excitation. Direct current can be supplied from a separate source or from a DC generator directly connected to the motor shaft.
The synchronous AC motor is often constructed with the slip ring as a conductive surface on the rotor shaft that is electrically connected to the rotor windings. The brushes are stationary and held firmly against the slip rings by spring pressure. These components complicated the motor construction, and add cost to the motor design, and require considerable maintenance. As a result of this the majority of the AC motors in service, particularly small to medium sized motors; belong to the other category the induction AC motor.
Induction AC Motors
The standard induction AC motors are essentially a transformer with the secondary winding free to rotate. Induction AC motors are the simplest and the most rugged electric motor and consists of two basic parts; the wound stator and the rotor assembly. The induction motor gets its name from current flowing in the secondary rotor that is induced by alternating currents flowing in the primary member or stator. The combined electromagnetic effects of the stator and rotor currents produce the force to create rotation. The rotors typically are made of a laminated, cylindrical iron core with slots for receiving the conductors. The most common type of rotor has cast-aluminum conductors and short-circuiting end rings. Because of the unique appearance, these rotor bars are called “squirrel cages”. This “squirrel cage” rotates when the moving magnetic field induces a current in the shorted conductors. The speed at which the magnetic field rotates is the synchronous speed of the motor and is determined by the number of poles in the stator and the frequency of the power supply.
Call Our AC Motor Specialists Today!
For more information or to purchase an AC Motor call TEMCo. TEMCo has been in business for over 40 years and has become a leader in supplying motors and electrical power equipment. We base our success on only providing the highest quality products at the lowest price. With our large inventory most, AC motor can be shipped out within 24 hours.
Tower Electric Motor Company has experience selling and maintaining electrical motors and manufacturing single to three phase converters over the years since 1968. All our electrical products are made to the highest quality standards and are backed by our industry standard warrantees. When you want an electric motor, phase converter, or quality motor supply, turn to TEMCo.
Lowest Prices on AC Motors - Guaranteed!
1-510-490-2187 or 1-800-613-2290
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