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Figure 1710 Magnetic eld in a salient rotor winding
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Figure 1711 Magnetic eld of stator
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Introduction to Electric Machines
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The accompanying CD-ROM includes 2-D movies of the most common types of electric machines You might wish to explore these animations to better understand the basic concepts described in this section
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171 The percent speed regulation of a motor is 10 percent If the full-load speed is 50 rad/s, nd (a) the no-load speed in rad/s, and (b) the no-load speed in rev/min 172 The percent voltage regulation for a 250-V generator is 10 percent Find the no-load voltage of the generator 173 The nameplate of a three-phase induction motor indicates the following values:
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HP = 10 RPM = 1,750 Temperature rise = 60 C Volt = 220 V Service factor = 115 Amp = 30A
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Find the rated torque, rated volt-amperes, and maximum continuous output power
174 A motor having the characteristics shown in Figure 174 is to drive a load; the load has a linear torque-speed curve and requires 150 percent of rated torque at 1,500 rev/min Find the operating point for this motor-load pair
DIRECT-CURRENT MACHINES
As explained in the introductory section, direct-current (DC) machines are easier to analyze than their AC counterparts, although their actual construction is made rather complex by the need to have a commutator, which reverses the direction of currents and uxes to produce a net torque The objective of this section is to describe the major construction features and the operation of direct-current machines, as well as to develop simple circuit models that are useful in analyzing the performance of this class of machines Physical Structure of DC Machines A representative DC machine was depicted in Figure 178, with the magnetic poles clearly identi ed, for both the stator and the rotor Figure 1712 is a photograph of the same type of machine Note the salient pole construction of the stator and the slotted rotor As previously stated, the torque developed by the machine is a consequence of the magnetic forces between stator and rotor poles This torque is maximum when the angle between the rotor and stator poles is 90 Also, as you can see from the gure, in a DC machine the armature is usually on the rotor, and the eld winding is on the stator To keep this torque angle constant as the rotor spins on its shaft, a mechanical switch, called a commutator, is con gured so the current distribution in the rotor winding remains constant and therefore the rotor poles are consistently at 90 with respect to the xed stator poles In a DC machine, the magnetizing current is DC, so that there is no spatial alternation of the stator poles due to time-varying currents To understand the operation of the commutator, consider the simpli ed diagram of Figure 1713 In the gure, the brushes are xed, and the rotor revolves at an angular velocity m ; the instantaneous position of the rotor is given by the expression = m t
Part III
Electromechanics
Polyester impregnated armature for electrical and mechanical integrity Class H insulation Custom windings available Shaft modifications, shaft seals and precision balancing available
Patent anti-cog magnets for smooth low speed operation High overcurrent capacity and dynamic braking without demag
Large conduit box roomy wiring compartment for easy termination TEFC, TENV and open drip proof configurations (b) Rugged, fused commutator Long life, constant force brush springs with field replaceable brushes Extended life brush systems available Many environmental protection options include custom enclosures and finishes, corrosion and fungus proofing
Large sealed bearings are standard NEMA or custom mounting faces Available metric, pump and foot mounts Permanent magnet fields are more efficient, smaller, lighter and offer wider speed range than comparable wound field motors (a)
Figure 1712 (a) DC machine; (b) rotor; (c) permanent magnet stator
L2 L3 iL L4 L5 L1 iL L6 Brush
Figure 1713 Rotor winding and commutator
The commutator is xed to the rotor and is made up in this example of six segments that are made of electrically conducting material but are insulated from each other Further, the rotor windings are con gured so that they form six coils, connected to the commutator segments as shown in Figure 1713 As the commutator rotates counterclockwise, the rotor magnetic eld rotates with it up to = 30 At that point, the direction of the current changes in coils L3 and L6 as the brushes make contact with the next segment Now the direction of the magnetic eld is 30 As the commutator continues to rotate, the direction of the rotor eld will again change from 30 to +30 , and it will switch again
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