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Can you wire a 3 phase 690 volt delta star motor to 480 volt 3 phase with out harming the motor?
Depends on the motor and the load on that motor. If the motor is loaded to its capacity, it will draw the same amount of power as it would on 690 volts - which will result in ( 690/480 = ) 144% of normal current, which will thermally damage the motor, or will trip overload protection.
What is the efficiency of a 12 volt electric motor?
Efficiency of any electrical machine is maximum when the load on that machine is such that the variable loss ( copper loss) is equal to constant loss (eddy current loss, hysteresis etc).the same applies to dc machines too.
Why friction and windage loss for an induction motor remain constant with change of stator voltage?
Because the RPM remains same
Core loss of an induction motor?
Just like a transformer, the core losses are a combination of eddy current losses and hysteresis losses.
Does the RPM of a motor vary if a load is added to the motor?
The speed of an electric motor is directly proportional to the frequency of supply. The rpm written on the name plate is the maximum operating speed for the motor design. Typically, for a squirrel cage induction motors, the speed is constant by design and this type of motor cannot operate for a long time at speeds below the rated value. It is true that loading affects motor speed to some extend but the electric motor will accelerate to the rated speed. If the loading is within the design parameters of the motor, the electric motor speed will not drop. What typically happens is that if the loading increases, the speed goes down, and the current increases. Because voltage is constant, this result in a high I2R loss in the windings and the motor circuit protection trips on thermal and electrical overload. The formula for electric motor speed is SRPM=(120f)/P. The above is for AC motors. If you are referring to a DC motor, what you have stated is correct. The motor will slow down as load is added. That is why you are not supposed to run many DC motors under no load conditions - they will overspeed.
What are the psychoactive effects of inhalants?
Disorientation, confusion, and memory loss.
Effects of Ambien?
Sleepyness, loss of motor control, hallucinations.
What is akinesia?
Akinesia is the loss of the ability to control motor muscles.
What are the dangers of using nitrous oxide?
Nitrous oxide causes a loss of motor control which is likely to make you fall down immediately after using it. If inhaled from the tank, frostbite can occur to the face and mouth. Other side effects include nausea, sleepiness, lack of coordination, disorientation and loss of appetite. Nitrous oxide can cause asphyxiation when not mixed with oxygen.
Does Brown-Sequard syndrome cause loss of bowel control?
Loss of bladder and bowel control may result, but the majority of patients will regain control
Loss of control and regulation of what can result in the development of cancer?
Cell division
What is disorientation?
the loss of proper bearings, or a state of mental confusion as to time, place, or identity.
What is a failure to practice important motor skills can result in a loss of agility because unused neural connections?
Pruned
Loss of ability to perform skilled motor activities are damaged to what?
Loss of ability to perform skilled motor activities is often due to damage to the motor cortex or the pathways that connect the motor cortex to the muscles. Other possible causes include damage to the cerebellum or basal ganglia, which are involved in coordinating movement. Additionally, damage to the spinal cord can also result in loss of skilled motor function below the level of the injury.
What are symptoms of loss of consciousness?
lack of response to voice or touch; disorientation or stupor; light-headedness; headache; sleepiness; Not breathing
What are the main features of Alexander disease?
The main features of Alexander disease are progressive mental impairment and loss of motor control.
Why does 1996 Pontiac sunfire engine surges after warming up It if fine for the first 20minutes of driving then surges.?
This is a dangerous condition that can or will result in a collision/loss of control. There are multiple causes which include an evaporative emissions component failure and idle air control motor. These problems are indicated by the engine racing inexplicably.
