By Edward B. Saff

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Extra info for Approximation Theory - Tampa: Proceedings of a Seminar Held in Tampa, Florida, 1985-1986

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94 = 47 HP The ambient temperature may also have to be considered. The ambient temperature may be reduced from 40°C to 30°C at 6600 feet on many motors. A motor with a higher insulation class may not require derating in these conditions. Ambient Temperature (°C) 40 30 20 Maximum Altitude (Feet) 3300 6600 9900 55 AC Motors and AC Drives Many applications require the speed of an AC motor to vary. The easiest way to vary the speed of an AC induction motor is to use an AC drive to vary the applied frequency.

It is appropriate to supply a drive with a higher continuous horsepower rating than the motor when high peak torque is required. 59 Selecting a motor AC drives often have more capability than the motor. Drives can run at higher frequencies than may be suitable for an application. Above 60 Hz the V/Hz ratio decreases and the motor cannot develop 100% torque. In addition, drives can run at low speeds, however, self-cooled motors may not develop enough air flow for cooling at reduced speeds and full load.

Stator coil arrangement The following schematic illustrates the relationship of the coils. In this example six coils are used, two coils for each of the three phases. The coils operate in pairs. The coils are wrapped around the soft iron core material of the stator. These coils are referred to as motor windings. Each motor winding becomes a separate electromagnet. The coils are wound in such a way that when current flows in them one coil is a north pole and its pair is a south pole. For example, if A1 were a north pole then A2 would be a south pole.

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