Search Results for: motor

Universal Motor – Construction, Working Principle and Applications: A universal motor is a specifically designed series wound motor, that operates at approximately the same speed and output on either dc or ac of approximately same voltage. Because of the difficulty in obtaining like performance on dc and ac at low speeds, most universal motors are […]

Permanent Capacitor Single Phase Induction Motor: Permanent capacitor single phase induction motor, also sometimes called the single-value capacitor—run motor, has two stator windings placed mutually 90 electrical de­grees apart. The main or running winding is connected di­rectly across the single phase ac supply. A capacitor in series with the auxiliary winding is also connected across

Capacitor-Start Capacitor-Run Single Phase Induction Motor: The capacitor-start capacitor-run motor is similar to capacitor-start, induction-run motor, except that the auxiliary winding and a capacitor remain connected in the circuit at all times. Of course, such as motor consists of two different capacitors—one small value oil impregnated paper continuous rating capacitor CR and another much larger

Resistance Start Single Phase Induction Motor: It is a form of split-phase motor having a high resistance connected in series with the auxiliary or starting winding, as illustrated in Fig. 1.38 (a). A typical torque-speed characteristic is shown in Fig. 1.38 (b). The starting torque is 1.5 times to twice the full-load starting torque and

Three Phase AC Shunt Commutator Motor: The connection diagram of a three phase ac shunt commutator motor is shown in Fig. 1.37. In this motor, the stator is connected directly to the supply while the rotor brushes are connected to the supply through a transformer. Speed vari­ation is obtained by changing the tapping points on

Three Phase AC Series Commutator Motor: This machine has a 3-phase stator winding similar to that of an ordinary induction motor and may be wound for high voltage if required. The rotor carries a winding similar to that of a dc machine and its commutator is provided with three brush sets per pair of poles

Compensated Induction Motor (No-Lag Type Motor): This is an improve­ment of the plain induction motor designed to operate at approximately unity or slightly leading power factor over the whole range of loads. The usual type of compensated induction motor is no-lag type motor, which consists of a primary winding placed on the rotor and the

Schrage Motor – Connection Diagram, Advantages, Disadvantages and Applications: Variable Speed Commutator Type 3-Phase Induction Motor (Schrage Motor). This is also an improvement of the plain induction motor designed to provide a variable speed. It also consists of a commutator winding placed on the rotor in addition to primary winding, whose emf is collected and

Electric Motor Speed Torque Characteristics: A Electric motor speed torque characteristics is defined as the relationship between the speed at which it operates and the torque it develops, ω = f(T). Practically all electric motors—shunt wound, series wound, compound dc motors, squirrel-cage and slip-ring induction motors, and ac commutator motors, have drooping speed-torque characteristics, i.e., their