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Figure 10-4 Speed torque curves for a typical split-phase motor
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Figure 10-5 Speed torque curves for a typical capacitor-start motor
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The permanent split-capacitor (PSC) motor is compact, easily maintained, and highly efficient The schematic for this motor, Fig 10-3c, shows an electrolytic capacitor in series with the starting winding and the main winding connected in parallel across the AC line These windings are energized during both starting and running Unlike both SP and CS motors, PSC motors do not include a centrifugal switch The typical speed torque curve for a PSC motor, Fig 10-7, shows the low starting torque and smooth acceleration of this motor An important feature of these motors is their ability to run at different speeds PSC motors are rated from 1 4 to 1 hp, and they are used to drive refrigerator and airconditioning compressors, dehumidifiers, garage door openers, floor-polishing machines, and fans for heaters and attic ventilation
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Exploded view of a capacitor-start motor in a 182-4T frame
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Figure 10-7 Speed torque curve for a typical permanent split-capacitor motor
TWO-CAPACITOR START/ONE-CAPACITOR RUN MOTORS
The two-capacitor start/one-capacitor run motor is a variation of the permanent splitcapacitor motor The schematic for this motor, Fig 10-8, shows an electrolytic capacitor in series with a centrifugal switch and in parallel with an oil-type capacitor which is in series with the starting winding As in the other single-phase motors, the main winding is in parallel across the AC line The electrolytic capacitor is used for starting and the oil-type capacitor is used for both starting and running The two capacitors give these motors higher starting torque and lower starting current than PSC motors
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Figure 10-8 motor
Two-capacitor start/one-capacitor run
They also improve the motor s efficiency while reducing its running noise below that of comparably rated PSC motors The use of two capacitors for starting and one for running overcomes compromises made in PSC motors and can provide optimum running and starting characteristics When the motor is started, the two capacitors are in parallel, but as the motor approaches a predetermined speed, the electrolytic capacitor is disconnected by the centrifugal switch The PSC motor runs cooler than the other capacitor motors, and its lower starting current contributes to its longer life and the greater reliability of the centrifugal switch Two-capacitor start/one-capacitor run motors are used in many of the same applications as PSC motors, where their higher performance justifies their higher cost However, these motors are usually only rated for 1 hp or more
SHADED-POLE (NONSYNCHRONOUS) AC MOTORS
Shaded-pole AC motors are simple, nonsynchronous induction motors that offer low starting and running torque With no internal switches, brushes, or special parts, they are inexpensive to make and low in cost Because of their low efficiency, they are made only with fractional horsepower ratings, for powering clocks and small consumer appliances The stator poles of shaded-pole motors have been modified to form short-circuited auxiliary shading coils, as shown in Fig 10-9 The narrow slots cut in the main poles form the auxiliary shaded poles, which are about one-third as wide as the main poles They are wrapped with copper straps as shown When the main motor windings are energized, the oscillating magnetic field induced around the main poles induces a current in the shading coils This current reduces the magnitude of the main magnetic field and causes it to lag in time phase Because the main and shading coils are separate, a shifting magnetic field similar to a rotating field is established across the pole faces This field interacts with the motor s squirrel-cage rotor to produce a small starting torque that can rotate the rotor in only one direction
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Figure 10-9 End view of the stator of a four-pole shaded-pole motor with four shading poles
Shaded-pole motors run quietly, without vibration They are considered fail-safe for powering small appliances such as fans, hair dryers, and clocks because they start and turn in only one direction They are made with ratings from 1/2000 to 1 6 hp, and have full-load speeds of 1450 to 3000 rpm when powered from a 120/240-V AC line Rotor speed can be changed by controlling the voltage with resistors or semiconductor devices
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