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FRACTIONAL HORSE POWER MOTORS
- 1. Submitted by:- Savaliya JayeshR. 130960109033 Salakhna Keyur R. 130960109032 Submitted to:- ASSi.PRO.DHARMISTHA MAYANI
- 2. FRACTIONAL HORSE POWER MOTORS PermanentMagnet Synchronous Motor Reluctance Motor Hysteresis Motor Stepper Motor Servo Motor
- 3. Permanent Magnet SynchronousMotor There are two types of permanent magnet motor structures: 1) Surface PM machines - sinusoidal and trapezoidal 2) Interior PM machines - regular and transverse
- 4. PMSM Qualities 1. Operationis noise less 2. High power factor 3. better efficiency just a induction motor kw rating 0.5 to 1.5 kw
- 5. Reluctance Motor The ReluctanceMotor has a simple, rugged and low cost structure. It has no permanent magnet or winding on the rotor. This structure not only reduces the cost of the RM, but also offers high-speed operation capability for this motor. Unlike the induction and permanent magnet machines, the RM is capable of high- speed operation without the concern of mechanical failures that result from the high level centrifugal force. In addition, the inverter of the RM drive has a reliable topology. The Stator windings are connected in series with the upper and lower switches of the inverter. This topology can prevent the shoot-through fault that exists in the induction and permanent motor drive inverter.
- 7. Applications of RM 1.Analog electric meters. 2.Some washing machine designs. 3.Control rod drive mechanisms of nuclear reactors. 4. Hard disk drive motor.
- 8. Hysteresis Motor • Synchronousmotor with uniform air gap and without dc excitation. • Starts by virtue of hysteresis & eddy currents induced in the rotor by action of rotating mmf of the stator winding • Operates at synchronous speed. • May operate from 1ø or 3ø supply • Utilizes the phenomenon of hysteresis to produce mechanical torque
- 9. TORQUE-SPEED CHARACTERISTICS OFHYSTERESIS MOTOR • The motor develops constant torque right up to synchronous speed. • Hysteresis motors can synchronize any load they can accelerate, regardless of the inertia. • After reaching synchronism the motors continue to run at synchronous speed and adjust their torque angle to develop torques required by the loads. • Deviations from the ideal speed torque curves. *Curve A-when starting torque is not required *Curve B-when a high starting torque is required.
- 10. Hysteresis Motor applications 1.Indicating devices 2. Wall clocks 3. Teleprinters 4. Sound recording and reproducing apparatus 5. Timers.
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- 12. Full Stepper Motor •This animation demonstrates the principle for a stepper motor using full step commutation. The rotor of a permanent magnet stepper motor consists of permanent magnets and the stator has two pairs of windings. Just as the rotor aligns with one of the stator poles, the second phase is energized. The two phases alternate on and off and also reverse polarity. There are four steps. One phase lags the other phase by one step. This is equivalent to one forth of an electrical cycle or 90°.
- 13. Half Stepper Motor •This animation shows the stepping pattern for a half-step stepper motor. The commutation sequence for a half-step stepper motor has eight steps instead of four. The main difference is that the second phase is turned on before the first phase is turned off. Thus, sometimes both phases are energized at the same time. During the half-steps the rotor is held in between the two full-step positions. A half-step motor has twice the resolution of a full step motor. It is very popular for this reason.
- 14. STEPPER MOTOR • Somestepper motor uses permanent magnets. Some stepper motors do not have magnets and instead use the basic principles of a switched reluctance motor. The stator is similar but the rotor is composed of a iron laminates.
- 15. SERVO MOTOR Typical DCServo Motor DC motor Gears Feedback controller Housing
- 16. Servo vs. Steppermotor • Servo Motors provide: 1. Higher rotational torque 2. Higher max RPM 3. Positive Feedback Control • Stepper Motors provide: 1. Higher holding torque 2. More precise movement
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