Synchronous Motor
December 14th, 2009
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Synchronous Motor
Induction motor vs Synchronous motor?
In drving load in industries, which 1 is better? Induction motor or Synchronous motor? Dun tell me depends since there must be reason to choose either 1. LoL
Is synchronous motor better in lifting heavy load then induction motor?
A synchronous motor operates at precisely synchronous speed as determined by RPM=120f/p where RPM is the speed in revolutions per minute, f is the frequency of the supply voltage in Hz and p is the number of poles created in the motor stator by the windings. An induction motor operates at a speed that is usually about 2 or 3 percent less than synchronous speed when it is delivering rated torque, but at nearly synchronous speed when operating unloaded.
Synchronous motors are only really needed when the speed must be maintained at a precisely constant RPM. Even then, an induction motor with a speed control can be used.
Synchronous motors are used above some power level because they are more efficient and the operating cost savings outweighs the added motor cost and complexity compared to an induction motor. The power level above which synchronous motors are usually preferred is somewhere above a few thousand horsepower. Electric motors have been manufactured is sizes up to 135,000 horsepower. At some power level, induction motors may not be used at all.
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"Is synchronous motor better in lifting heavy load then induction motor?"
Lifting a load is something that requires the motor to start, run for a short time while lifting, and then stop when the load has been lifted. An induction motor is easier to start and more tolerant of frequent starting and stopping, so that might make an induction motor a better choice. However, if a very large motor is required, it would be possible to provide a control system to allow a synchronous motor to work just as well.
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Permanent Magnet Synchronous and Brushless DC Motor Drives $180.33 No Synopsis Available |
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Synchronous Idle $63.73 PMHigh Quality Content by WIKIPEDIA articles Synchronous Idle (SYN) is the ASCII control character 22 (0x16), represented as V in caret notation. Synchronous Idle is used in some synchronous serial communication systems such as teletypes or the bisync protocol to provide a signal from which synchronous correction may be achieved between data terminal equipment, particularly when no other character is being transmitted. The SYN character has the bit pattern 00010110, which has the property that it is distinct from any bitwise rotation of itself. This helps bitalignment of sequences of synchronous idle Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 68 Publication Date: 2010/11/19 Language: English Dimensions: 6.00 x 9.02 x 0.16 inches |
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Synchronous Frame $70.1 High Quality Content by WIKIPEDIA articles In the special theory of relativity, choice of coordinates is limited by the requirement for a special kind of spacetime metric: the Minkowski metric. In the general theory of relativity there is no such requirement so that the choice of reference frame is not limited: the three space coordinates x1, x2, x3 can take any values that define the positions of bodies in space while the time coordinate x0 can be measured by clocks with any possible adjustment. The problem thus arises how one can determine the real distances and time intervals by the values of x0, x1, x2, x3. First one must determine the true time (proper time), written by the symbol, with a coordinate x0. Consider two very close events that occur practically in the same point of space. Author: Surhone, Lambert M./ Tennoe, Mariam T./ Henssonow, Susan F. Binding Type: Paperback Number of Pages: 94 Publication Date: 2010/08/14 Language: English Dimensions: 6.00 x 9.02 x 0.23 inches |
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Lecture 40 - Synchronous Machine
Difference between induction motor and synchronous motor?
Guys can you help me out with this.
List at least ten (10) differences between induction motor and synchronous motor.
Thanks in advance.
I need it in my take home exam. TY
1. Synchronous motors operate at synchronous speed (RPM=120f/p) while induction motors operate at less than synchronous speed (RPM=120f/p – slip). Slip is nearly zero at zero load torque and increases as load torque increases.
2. Synchronous motors require DC excitation to be supplied to the rotor windings; induction motors don’t.
3. Synchronous motors require a DC power source for the rotor excitation.
4. Synchronous motors require slip rings and brushes to supply rotor excitation. Induction motors don’t require slip rings, but some induction motors have them for soft starting or speed control.
5. Synchronous motors require rotor windings while induction motors are most often constructed with conduction bars in the rotor that are shorted together at the ends to form a “squirrel cage.”
6. Synchronous motors require a starting mechanism in addition to the mode of operation that is in effect once they reach synchronous speed. Three phase induction motors can start by simply applying power, but single phase motors require an additional starting circuit.
7. The power factor of a synchronous motor can be adjusted to be lagging, unity or leading while induction motors must always operate with a lagging power factor.
8. Synchronous motors are generally more efficient that induction motors.
9. Synchronous motors can be constructed with permanent magnets in the rotor eliminating the slip rings, rotor windings, DC excitation system and power factor adjustability.
10. Synchronous motors are usually built only is sizes larger than about 1000 Hp (750 kW) because of their cost and complexity. However, permanent magnet synchronous motors and electronically controlled permanent synchronous motors called brushless DC motors are available in smaller sizes.
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