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The classification stray load loss includes all losses which vary with the load but which are not accurately determinable. Such losses are caused by:
1. Eddy currents in armature conductors.
2. Short-circuit currents in coils under commutation.
3. Eddy currents in bolts and other solid parts of the armature.
4. Flux pulsations produced by change in the reluctance of the magnetic path at teeth and slots; and flux pulsations produced by currents in coils under commutation.
5. Distortion of the flux in the armature produced by the armature reaction.
Inasmuch as the stray load losses are not accurately determinable, but do actually exist, the recommendation of the American Institute of Electrical Engineers is that they be assumed as 1 per cent of the power output when calculating conventional efficiency of machines having an output of 30 or more hp.
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Why field loss detectors necessary in large dc motor?
j
Why are field loss detectors necessary in large dc motor?
j
What is a failure to practice important motor skills can result in a loss of agility because unused neural connections?
Pruned
Field loss relay in dc motor starter is used to provide what type of protection?
A Field Loss Relay protects the motor or connected machinery from damage that could be caused by a sudden loss of power to the motor field. In a DC motor, reducing the field current causes an increase in rotor speed (Field Weakening control utilises this to run motors above their base speed). However, if the field current suddenly drops off, the armature will try to accellerate to infinite speed. Sometimes this will just blow the fuses on the drive, but I have witnessed a DC motor self-destruct because of field loss - the armature accellerated to such a speed that the centrefugal force ripped apart the rotor. The motor was only good for a boat anchor afterwards. - OK, now for my free advertising: if anyone needs a good reliable source for repairs of motor drives, PLC's, operator panels and other electronics, call AFI Systems LLC at (704)889-2404. We also design industrial control systems and circuit boards, and buy & sell used industrial electronics! Thanks for reading this post! - Andy Fleming.
What causes 3-phase motors to heat up?
It is not only 3 phase motor, but every electrical device heats up. The reason is the current flowing through the windings causes the I^2*R heat loss. Apart from that, in case of an induction motor, the alternate cycle of magnetization and demagnetization of core material causes the hysterisis loss and eddy current loss. Last but not the least, there are friction and windage losses for a rotating electrical machine. All of these losses are dissipated as heat energy and hence the machine heats up.
What neuological diseases cause loss of motor function in arms and legs?
What would cause loss of motor function in upper thighs
Loss of ability to perform skilled motor activities might suggest damage to?
The motor cortex.
What disease causes slured or loss of speech and loss of motor skills for 24 hours?
alcohol intoxication
Effects of Ambien?
Sleepyness, loss of motor control, hallucinations.
What is akinesia?
Akinesia is the loss of the ability to control motor muscles.
Do all seizures involve a complete loss of motor control?
No, not all seizures involve a complete loss of motor control. Seizures can vary widely in presentation; some, like tonic-clonic seizures, do involve loss of motor control, while others, such as absence seizures, may result in brief lapses of awareness without significant motor changes. Additionally, focal seizures can lead to specific muscle movements or sensations without a total loss of control.
What is the loss payee clause address for Ford motor credit not general liability?
A loss payee clause for Ford Motor Credit typically specifies that in the event of a loss or damage to a vehicle financed through them, the insurance proceeds will be paid directly to Ford Motor Credit as the loss payee. This ensures that the lender's financial interest in the vehicle is protected. It is important to refer to the specific contract or policy documentation for precise wording and details regarding the loss payee clause.
Why are the field loss detectors necessary in the large dc motors?
Field loss detectors are essential in large DC motors because they monitor the integrity of the field winding, ensuring that the motor operates safely and efficiently. If the field winding fails or experiences a loss of excitation, the motor can run at dangerously high speeds, leading to mechanical failure or damage. By detecting field loss promptly, these devices can trigger protective measures, such as shutting down the motor or reducing its load, thereby preventing accidents and extending the motor's lifespan. Overall, field loss detectors enhance the reliability and safety of large DC motor operations.
What is the journal entry to write off a motor vehicle involved in an accident?
Debit loss of motor vehicleCredit vehicle account
Why field loss detectors necessary in large dc motor?
j
Does slip of induction motor depend upon core loss component?
No,
Loss of ability to perform skilled motor activities are damaged to what?
Generally neurological damages, such as nerve damage or brain damage, result in the loss of motor functions. This can be due to severe burns, electrical shock, or blunt force trauma to the head, neck, and or spine.
