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CLUTCHES AND BRAKES 8.45
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CLUTCHES AND BRAKES
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For finding the average contact pressure, use Eq. (8.63): pav = pmax 2Ri /Ro 2(3.875)/5.5 = 316 = 261 psi 1 + R i /Ro 1 + 3.875/5.5
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8.8 ELECTROMAGNETIC TYPES
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Electromagnetic forces are used in a variety of ways to couple two sides of a clutch or a brake. The use of electrically generated forces implies relatively easy means of automatic control. 8.8.1 Magnetically Actuated Friction Clutches and Brakes The most common use of electromagnetic forces is to provide the actuating force for a friction brake or clutch. The configuration shown in Fig. 8.27 can be used either as a clutch or as a brake. When power is applied to the coil, the magnet, faced with a friction material, attracts the armature. Torque can be varied by using a potentiometer. If one member is fixed, the device functions as a brake; otherwise, it is a clutch. The combination clutch-brake in Fig. 8.28 uses a single solenoid coil. When the coil is deenergized, the clutch is disengaged and springs prevent the release of the brake. When the coil is energized, the clutch is engaged and the brake is released. An arrangement of opposing mechanical springs ensures that the input-side clutch is fully engaged for a brief time before the brake is released. This is done by making the springs assisting clutch engagement weaker than those resisting brake release.
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FIGURE 8.27 Electromagnetic friction clutches and brakes. (Warner Electric Brake and Clutch Co.)
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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CLUTCHES AND BRAKES 8.46
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MACHINE ELEMENTS THAT ABSORB AND STORE ENERGY
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FIGURE 8.28 Clutch-brake transmission. A, input; B, output; C, field coil bearing; D, field coil assembly; E, pressure cup; F, brake plate; G, hub spring; H, rotor assembly; I, brake spring; J, brake armature; K, field coil; L, clutch armature; M, clutch spring; N, drive plate; P, air gap. (Electroid Corporation.)
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8.8.2 Magnetic Clutches The operating characteristics of three types of magnetic clutches are shown in Fig. 8.29. Magnetic-particle clutches (Fig. 8.29a) use an iron powder mixed with a lubricant to partially fill the annular gap between members. When a direct-current (dc) coil induces a magnetic field, the iron particles form chains and provide the means to transmit torque. There is a nearly linear relation between coil current and torque. Hysteresis clutches (Fig. 8.29b) directly couple the two members as long as the load does not exceed the torque rating. They can also slip continuously to maintain a constant-torque output independent of speed. The eddy-current clutch (Fig. 8.29c) is rather like the hysteresis clutch in construction. Torque is developed if there is slip. The torque is associated with dissipation of eddy currents in the rotor ring s electric resistance.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
CLUTCHES AND BRAKES
FIGURE 8.29 Torque characteristics of magnetic clutches. (a) Magnetic-particle clutch has a characteristic that is independent of slip and increases almost linearly with coil current. (b) Hysteresis clutch exhibits almost a constant torque out to the thermal, which begins at B; temperature then limits the torque capacity from B to C. (c) Eddy-current clutch exhibits a constant-torque characteristic at rated slip speed. (From Ref. [8.5].)
8.47 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
CLUTCHES AND BRAKES 8.48
MACHINE ELEMENTS THAT ABSORB AND STORE ENERGY
8.8.3 Dynamic Braking When it is necessary to bring a motor-driven load from operating speed to rest in less than the normal coasting time, braking is necessary. However, for motors, the braking can be done by purely electrical means through dynamic braking. Electric braking, or dynamic braking, is done by altering the connections to the motor. It may be done with or without the aid of an external power source. Dynamic braking is available for fractional-horsepower motors. The designer should keep this option in mind.
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