Squirrel-cage induction motor applications

TABLE 29-2 Characteristics and Typical Applications for Squirrel-Cage Induction Motors... [Pg.2484]

This polyphase (usually three-phase compared to singlephase) motor is the basic work horse of the process industries for general-purpose applications. Characteristics of polyphase squirrel-cage induction motors are... [Pg.620]

The most popular form of motor speed control for adjustable-speed pumping is the voltage-controlled pulse-width-modulated (PWM) frequency synthesizer and ac squirrel-cage induction motor combination. The flexibility of application of the PWM motor drive and its 901-percent electrical efficiency along with the proven ruggedness of the traditional ac induction motor manes this combination popular. [Pg.92]

A variation on the theme of pole changing is a particular type of squirrel-cage induction motor, called the Pole Amplitude Modulated (PAM) motor. PAM motors should be used for low speed applications thereby requiring many poles e.g. 10, 12, 16. In addition, the various speeds required should not be widely different. This means that the number of effective poles will not be too dissimilar, e.g. [Pg.390]

Typically in the lower torque range (geared hoist drives), the preference is for squirrel-cage induction motors. Variable speed drive application allows for Optimum Pole design of the motors, where the number of motor poles is selected by taking into account the torque density, power factor and speed range, rather than the maximum operating speed for a fixed frequency. [Pg.191]

Unhke squirrel-cage induction motors, wound-rotor motors have controllable speed and torque. Their application is considerably different from squirrel-cage motors because of the accessibility of the rotor circuit. Various performance characteristics can be obtained by inserting different resistances in the rotor circuit. [Pg.609]

Today s standard motor enclosure for indoor applications is the open, drip-proof enclosure for induction and high-speed synchronous motors. For large motors, open, drip-proof construction is available up to about 20,000 hp and is used for squirrel-cage, synchronous, and wound-rotor motors. [Pg.259]

Torque, horsepower, and speed requirements demanded in drives for most machines can be met with one of four designs of squirrel-cage polyphase induction motors, Each design offers a different combination of torque, speed, and current characteristics to meet the operating requirements of various industrial applications. [Pg.409]

Synchronous Motor Starting. This method is used for power-factor correction of heavy concentrations of induction motors. It is also used for constant-speed, slow-speed industrial drive applications and for maximum efficiency on continuous heavy loads in excess of 75 hp (55 kW). Three-phase ac power is connected to the stator and dc to the rotor (which has both a field and a squirrel-cage winding). [Pg.646]

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