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How does a Variable speed transmission work?
Assume a 3 phase AC Induction motor. The speed of the motor is derived by the formula N = (120/f)/P. N speed, f - frequency, P number of poles. In an induction motor P is fixed by the winding. f system frequency. Variable speed drives change the system frequency so that the speed (N) can be varied. Drive is a power electronic device through which the system frequency can be varied
How does fixed displacement of hydraulic pump affect the speed of bent axis hydraulic motor?
The fixed displacement of a hydraulic pump determines the volume of hydraulic fluid it delivers with each rotation, directly influencing the speed of a bent axis hydraulic motor. Since the motor's speed is proportional to the flow rate provided by the pump, a fixed displacement pump will produce a consistent flow rate, resulting in a steady motor speed. However, if the load on the motor increases, the speed may decrease due to the pump's inability to provide additional flow. Thus, the fixed displacement setup ensures predictable motor performance under constant conditions.
What type of machine that use asynchronous motor?
Typically a synchronous motor is applied in constant speed applications where the higher cost of the motor is offset by the improved power factor realized
How does a furnace multi speed motor work?
Mutli speed furnace motors work on a basis of horse power verses work load. The motor actually contains multiple windings or you could say multiple motors. Each of the windings has a specific horse power rating at a given work load. For example, a 3 speed 1/2 horse power motor is actually 3 different horse powers. High is 1/2 hp - medium is 1/3 hp - low is 1/4 hp. As the motor horse power is decreased the motor will slow down under a given or constant work load. Technically there is no such thing as a multi speed motor but in actuality a multi horse power motor.
What is the speed regulation mechanism in motor for fans?
The speed regulation mechanism in motors for fans typically involves controlling the voltage and frequency supplied to the motor. This can be achieved using methods such as variable frequency drives (VFDs), which adjust the frequency of the electrical supply to change the motor speed. Additionally, some fans utilize resistors or capacitors to vary the voltage, allowing for speed adjustments. These mechanisms enable efficient operation and tailored airflow for various applications.
What will happen to speed-torque characteristics of an induction motor is the rotor resistance is increased?
If Rotor resistance is increased torque is increased
Performance curve of a single phase induction motor?
The performance curve can be a graph of torque versus speed. The torque is zero at zero speed and also at the synchronous speed. Normally an induction motor operates at 90-97% of the synchronous speed, where the slip is between 10% and 3%. In this region the torque is proportional to the slip. As the torque is increased the speed falls until the motor stalls and the speed drops to zero. Below the stalling speed the torque rises between zero speed and the stalling speed. Because the torque is 0 at 0, a single-phase induction motor needs a separate starting winding fed by a starting capacitor to produce a little positive torque that starts the motor.
Why induction motor current increase when load increase?
The slip is proportional to the load torque in an induction motor. This can also be seen as a reduction in speed causing extra current to be induced in the rotor to supply the increased torque.
Speed of the stator field of an Induction motor is?
synchronous speed
What are the advantages of induction motor?
1. Induction motor has high starting torque, therefore use for operate pump which need high starting torque. 2. Induction motor operate on variable speed. 3. It can be used as generator when speed of motor is higher than synchronous speed.
Application of induction motor in industry?
Induction motor used in industries for variable speed machines . Induction motor has always lagging power factor. Less cost compared to syn. Motor.
Difference between induction motor and induction generator?
in case of induction motor the rotor speed is less than synchronous speed giving positive slip but in case of generator the rptor speed is greater than synchronous speed giving negative slip.......
What are convectional and non convectional methods of speed control of a induction motor?
The flux control method is the convectional and the non-convectional method of speed control of an induction motor.
If a three phase induction motor runs at a speed greater than synchronous speed?
When an induction motor is pushed over synchronous speed it will become a generator and will deliver power back to the utility.
What is speed controller?
It is used for sensorless motor control. With vf speed control u can control speed of any induction motor.
What did mean by standstill in induction motor?
rotor speed = 0
Why doesn't an induction motor run at synchronous speed?
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