how to use barcode in rdlc report FIGURE 1670 Universal motor in Software

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FIGURE 1670 Universal motor
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FIGURE 1671 Speed-torque curves of repulsion motor
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is in the same line; therefore, no starting torque is developed It is therefore necessary to shift the brushes about 20 out of phase with the primary winding to obtain the maximum starting torque The brushes are xed in position This motor also has series speed-torque characteristics Adjustable varying speed may be obtained by voltage control as shown in Fig 1671 The power factor of a 3-hp (22kW) 1800-rpm motor would be about 08 Commutation at full load is very good Repulsion Brush-Shifting Motors These are similar to the preceding motor but have arrangements for shifting the brushes With the brushes set as before, the motor would have the same speed-torque curve With any other brush position, the speedtorque curve would be similar Thus a series of these curves may be obtained similar to those shown in Fig 1671 for change in voltage Over a speed change of about 25:1, the motor gives constant torque This motor can be used for reversing service by brush shifting Split-Phase Motors The stator is wound as in a two-phase, squirrel-cage motor The two phases are connected in multiple, with a resistance or reactance in series with one of them, to obtain starting torque (see Fig 1672) The starting winding is for intermittent service and is cut out by a centrifugal switch Capacities are 1 30 to 1 4 hp (25 to 187 W) These motors are for constant-speed applications, such as for fans, blowers, washing machines, and other domestic appliances The torque curve is somewhat like that of a squirrel-cage motor, starting at 75 to 100 percent torque at zero speed and reaching 200 to 250 percent at about 85 percent speed When the starting winding is cut out, there is a drop in torque Capacitor or Condenser Motor This motor is similar to the preceding motor but has a condenser instead of a resistor in series with one phase, this being left permanently in circuit This motor has a low starting torque, 50 to 100 percent, but may be used on applications similar to those for the preceding split-phase motor These motors have the advantage of not having either a centrifugal switch or a commutator The power factor is good, approaching unity in some cases These motors may be built up to 25 hp (187 kW), but are much more expensive than a three-phase motor of the same rating They may be started by throwing directly on the line Another variation of the condenser motor has a second block of condensers in parallel with the starting condenser This gives high starting torque, from 100 to 300 percent, depending on the condenser used It requires a centrifugal switch to cut out the starting condenser, or an extra switch in the starter, or a normally closed contactor with its coil connected across the starting winding; this gives low voltage at starting, which increases with the speed When the voltage reaches a certain value, the contactor opens These motors are used where commutator motors are not desired
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FIGURE 1672 Connections for split-phase motor
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Repulsion-Induction Motors Here the stator winding is of the distributed singlephase type The rotor is a combination of the repulsion type and the high-reactance squirrel-cage type, both windings being in the same slots These windings are so arranged that during starting, the repulsion characteristics predominate, giving high starting torque During running, the squirrel-cage winding predominates, giving nearly constant speed Some builders use a switch to change from the starting to the running condition, while others make the change inherent in the machine Owing to the combination winding, the running torque is very high Figure 1673 shows a torque-speed curve for a 3-hp (22-kW), 1800-rpm motor The no-load speed is slightly above synchronism (about 3 percent), and the full-load speed is an equal amount below Since the motor operates, after starting, as a squirrel-cage motor, only a small number of brushes are required Hence the motor is very quiet The commutation is practically perfect The ef ciency should be between 75 and 80 percent The power factor varies up to 95 percent Speed control may be obtained by varying the line voltage Control Practically all single-phase motors are thrown directly on the line, usually by a simple snap switch If speed control or reversing is required, the starter must be ampli ed accordingly
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88 Synchronous Motors A synchronous motor is built very nearly like an ac generator It has a distributed stator winding and a rotor winding which is usually on salient poles It differs from a generator in that it has a squirrel cage built into the rotor for starting and to damp out oscillations or hunting The windings on the poles are the eld and are excited from direct current A few large and very high speed motors have a distributed rotor winding similar to that of a slip-ring induction motor This is necessary for mechanical reasons When starting, the eld or rotor circuit is open, and the motor operates as a squirrel-cage induction motor Since the torque curve is similar to that of a squirrelcage motor, it may be varied by changing the resistance and reactance of the squirrel cage When the motor has reached about 95 percent of synchronous speed, the eld is energized and the rotor pulls into step or synchronous speed It then rotates at the same speed as the revolving eld set up by the stator or primary winding
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