Electrical Power Systems Technology

350 Electrical Power Systems Technology Motor Reversal Dynamotor Brushless DC Motor DC Stepping Motor Single-Phase Alternating C ...

Mechanical Systems 351 motor are shown in Figure 14-1. A simple DC motor is constructed in the same way as a DC generator. Their ...

352 Electrical Power Systems Technology Sample Problem: Force Acting on a Conductor When a current-carrying conductor is contain ...

Mechanical Systems 353 where: F = force acting on a conductor in newtons, B = flux density in teslas, l = length of the conducto ...

354 Electrical Power Systems Technology decrease. As speed decreases, the voltage induced into the conductors of the motor throu ...

Mechanical Systems 355 to consider each of the steps involved, in order to understand DC motor operation. As the load on a motor ...

356 Electrical Power Systems Technology 2 πNT hp = ———— 33, 000 NT = ——— 5252 where: HP = the horsepower rating, 2 π = a constan ...

Mechanical Systems 357 1,885 W = ——— 746 horsepower = 2.53 HP Another DC motor characteristic that we should discuss is armature ...

358 Electrical Power Systems Technology Good speed regulation (low % SR) results when a motor has nearly constant speeds under v ...

Mechanical Systems 359 nent-magnet motor can be reversed by reversing the two power lines. Series-wound DC Motors—The manner in ...

360 Electrical Power Systems Technology small amount of current flows through the field. A strong electromagnetic field is produ ...

Mechanical Systems 361 torque and speed characteristics of DC motors. A DC motor is designed so that its shaft will rotate in ei ...

362 Electrical Power Systems Technology where the power source is connected to the motor. Four terminals are ordi- narily used f ...

Mechanical Systems 363 permanent magnets or electromagnetic windings, surrounds the armature assembly. Since the magnetic field ...

364 Electrical Power Systems Technology copper losses are relatively high. However, the advantages outweigh this disadvantage fo ...

Mechanical Systems 365 cumulative, regardless of the distance moved, or the number of steps tak- en. Motors of this type are ene ...

366 Electrical Power Systems Technology Figure 14-12. Illustration of the magnetic principle involved in the operation of a DC s ...

Mechanical Systems 367 of the stator-coil sets. Adding more stator-coil pairs to a motor of this type improves its rotation and ...

368 Electrical Power Systems Technology move 360 degrees every 200 steps, or 1.8 degrees per step. It is not unusual for steppin ...

Mechanical Systems 369 Induction Motors Another popular type of single-phase AC motor operates on the in- duction principle. Thi ...