tailieunhanh - Single Phase Induction

Permanent-split capacitor motor One way to solve the single phase problem is to build a 2-phase motor, deriving 2phase power from single phase. This requires a motor with two windings spaced apart 90o electrical, fed with two | Single Phase Induction Permanent-split capacitor motor One way to solve the single phase problem is to build a 2-phase motor, deriving 2-phase power from single phase. This requires a motor with two windings spaced apart 90o electrical, fed with two phases of current displaced 90o in time. This is called a permanent-split capacitor motor in Figure Main and Auxiliary windings 1-Phase Induction Motor This type of motor suffers increased current magnitude and backward time shift as the motor comes up to speed, with torque pulsations at full speed. The solution is to keep the capacitor (impedance) small to minimize losses. The losses are less than for a shaded pole motor. 1-Phase Induction Motor This motor configuration works well up to 1/4 horsepower (200watt), though, usually applied to smaller motors. The direction of the motor is easily reversed by switching the capacitor in series with the other winding. This type of motor can be adapted for use as a servo motor, described elsewhere | Single Phase Induction Permanent-split capacitor motor One way to solve the single phase problem is to build a 2-phase motor, deriving 2-phase power from single phase. This requires a motor with two windings spaced apart 90o electrical, fed with two phases of current displaced 90o in time. This is called a permanent-split capacitor motor in Figure Main and Auxiliary windings 1-Phase Induction Motor This type of motor suffers increased current magnitude and backward time shift as the motor comes up to speed, with torque pulsations at full speed. The solution is to keep the capacitor (impedance) small to minimize losses. The losses are less than for a shaded pole motor. 1-Phase Induction Motor This motor configuration works well up to 1/4 horsepower (200watt), though, usually applied to smaller motors. The direction of the motor is easily reversed by switching the capacitor in series with the other winding. This type of motor can be adapted for use as a servo motor, described elsewhere is this chapter Capacitor-start induction motor In Figure a larger capacitor may be used to start a single phase induction motor via the auxiliary winding if it is switched out by a centrifugal switch once the motor is up to speed. Moreover, the auxiliary winding may be many more turns of heavier wire than used in a resistance split-phase motor to mitigate excessive temperature rise. The result is that more starting torque is available for heavy loads like air conditioning compressors. This motor configuration works so well that it is available in multi-horsepower (multi-kilowatt) sizes. Capacitor-run motor induction motor A variation of the capacitor-start motor Figure is to start the motor with a relatively large capacitor for high starting torque, but leave a smaller value capacitor in place after starting to improve running characteristics while not drawing excessive current. The additional complexity of the capacitor-run motor is justified for larger size motors. 1-phase Capacitor

• Cơ khí - Chế tạo máy
• main wndgs
• centrifugal switch
• laminated stator slots
• rotor
• starring torque
• motors
• tiếng pháp
• ngoại ngữ
• ngữ pháp
• tiếng hoa
• tiếng anh
• Nouvelle grammaire du Français
• Ngữ pháp tiếng Pháp
• Tự học tiếng Pháp
• Le groupe du nom et les pronom
• Les mots invariables
• Le verbe