- Port:SHENZHEN
- Lead time:
| Quantity(pieces) | 1 - 1000 | 1001 - 10000 | >10000 |
| Lead time (days) | 15 | 30 | To be negotiated |
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Squirrel Cage Rotor
Advantages
--Simple and robust construction
Construction - Slip Ring Rotor
Main Parts
-Shaft
-Rotor CoreRotor windings
-Slip Rings
Construction - Slip Ring Rotor
Rotor Core
-laminated cylindrical core
-have slots on its outer periphery to accommodate balance 3o windings
Rotor Windings and Slip Ring Arrangement
-Rotor winding is usually star connected
-The open ends of rotor windings are brought out and connected to threeslip rings mounted on rotor shaft
-Brushes are used to take connection from these slip rings
-At starting high external resistances are usually included to improvestarting torque and reduce starting current.When motor attains normal speed, three brushes are short circuited
Squirrel Cage Rotor
Advantages
-Starting resistance can be included to improve starting torque
-Speed control is possible
Working
-Now the situation is like a current carrying conductor (rotor conductor)placed in a magnetic field (produced by stator)
-Thus mechanical force acts on all rotor conductors. The sum of mechanicaforces on all rotor conductors produces a torque which tends to moverotor in the same direction as that of rotating magnetic field
Advatages
1) Small and lightweight
2) Easy to achieve high-speed rotation with a speed exceeding 10000r/min
3) High operating efficiency at high speed and low torque
4) High torque
at low speeds and wide speed control range
5) High reliability (robustness)
6) Low manufacturing cost
7) Simplification of control devices
In the steady-state learning of induction motors, we know that there are many methods for regulating the speed of induction motors. Variable voltage, variable frequency, variable pole, and wound rotor induction motors can adjust the speed of the motor by serializing resistance or adding additional electromotive force (cascade speed regulation or doubly fed speed regulation) in the rotor circuit. However, years of research and practice have shown that variable frequency speed regulation is the most ideal speed regulation method for induction motors. The constant voltage frequency ratio control or voltage frequency coordinated control based on the steady-state model of an induction motor can achieve efficient and smooth speed regulation within a certain speed range, thus meeting the requirements of general production machinery for speed regulation systems.
However, due to the coupling effect inside the motor, the system's dynamic response is slow, which cannot meet the requirements for applications that require high dynamic performance. To achieve a high dynamic performance speed control system or servo system, the control system must be designed based on the dynamic mathematical model of the induction motor. Among various AC speed control methods based on dynamic mathematical models, vector control is currently the most widely used one.
