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What is a rocker arm in a DC motor and what will happen if the rocker arm connections are changed?
A rocker arm holds a carbon brush. In other words it is a carbon brush holder. Changing over the rocker arm connections is the same as changing over the armature connections and will make a DC motor turn in the reverse direction assuming that the magnetic orientation of the motor's field stays the same.More detailDC motor having a field windingIf the stator's field is created by a field winding and that winding's connections are changed over at the same time as the armature's connections are changed over, then the DC motor's direction of rotation will be the same as before.If the stator's field is created by a field winding and that winding's connections are not changed over at the same time as the the armature's connections are changed over, then the DC motor will turn in the reverse direction.DC Motor having a field created by a permanent magnetIf the stator's magnetic field is created by a permanent magnet and the orientation of that magnet is reversed at the same time that the armature connections are changed over, then the DC motor's direction of rotation will be the same as before.If the stator's magnetic field is created by a permanent magnet and the orientation of that magnet is not reversed at the same time as the armature connections are changed over, then the DC motor will turn in the reverse direction.
What is separately excited DC motor?
The main difference between the Separately excited motor and the shunt motor is the field cct where as in the second it has its own voltage supply.AnswerI think you mean 'generator', not 'motor'. A 'self-excited' motor is one in which the output supplies the field current, as well as the load current. A 'separately-excited' motor is one in which the field current is provided from an external source.
What is the effect of armature over voltage in a dc motor?
Overvoltage on DC motor armature can be detrimental to the life of the windings. Most modern drives have voltage feedback and detect this condition. A likely cause is loss of speed feedback, voltage feedback or the load driving the motor beyond what the drive can handle. Fixes for the above: -check and mend the feedback circuits and associated hardware (cable, tachos, input cards, processor cards) -change from a single quadrant to a four quadrant drive -install a braking resistor -inspect the mechanical system to ensure there are no wild split points in the gearing
What is reason for armature over voltage in 450 kw dc motors?
Here we used dcon digital dc drive
Why is stationary armature preffered you commercial generators than moving armature?
Stationary armature is preferred in commercial generators over moving armature because it allows for a more compact and efficient design. With a stationary armature, the magnetic field is stationary, which reduces wear and tear on the moving parts and increases the overall reliability of the generator. Additionally, a stationary armature design simplifies the electrical connections and maintenance of the generator, making it easier to operate and service in commercial applications.
Why does your car die during travel?
maybe your car gets over heated or your motor dies i have had the experience trust me
why starter motor armature over heat?
Usually caused by worn bearings.
Why do we get fevers?
When your body gets over heated
What is a rocker arm in a DC motor and what will happen if the rocker arm connections are changed?
A rocker arm holds a carbon brush. In other words it is a carbon brush holder. Changing over the rocker arm connections is the same as changing over the armature connections and will make a DC motor turn in the reverse direction assuming that the magnetic orientation of the motor's field stays the same.More detailDC motor having a field windingIf the stator's field is created by a field winding and that winding's connections are changed over at the same time as the armature's connections are changed over, then the DC motor's direction of rotation will be the same as before.If the stator's field is created by a field winding and that winding's connections are not changed over at the same time as the the armature's connections are changed over, then the DC motor will turn in the reverse direction.DC Motor having a field created by a permanent magnetIf the stator's magnetic field is created by a permanent magnet and the orientation of that magnet is reversed at the same time that the armature connections are changed over, then the DC motor's direction of rotation will be the same as before.If the stator's magnetic field is created by a permanent magnet and the orientation of that magnet is not reversed at the same time as the armature connections are changed over, then the DC motor will turn in the reverse direction.
How can the direction of rotation of a DC shunt motor be reversed?
DC shunt motor can be reversed by changing the polarity of either the armature coil or the field coil.
Can glue explode?
Yes because if it gets over heated or by firecracker.
What is separately excited DC motor?
The main difference between the Separately excited motor and the shunt motor is the field cct where as in the second it has its own voltage supply.AnswerI think you mean 'generator', not 'motor'. A 'self-excited' motor is one in which the output supplies the field current, as well as the load current. A 'separately-excited' motor is one in which the field current is provided from an external source.
Give the 5 reasons for the preference of revolving field alternators over the revolving armature type of machine?
Give the 5 reasons for the preference of revolving field alternators over the revolving armature type of machine?
Why would an 89 cad deville make a knocking sound when its off and parked?
Most likely your motor is low on oil and is knocking from being over heated.
Why does milk in saucepan overflow when heated over gas stove?
Milk overflows when heated in a saucepan because it contains proteins and fats that create a foam when heated. As the milk warms, steam forms and gets trapped in this foam, causing it to expand and rise. Once it reaches the top of the saucepan, it spills over. To prevent this, you can heat the milk slowly and stir it frequently.
What happens to an electric motor if it is over heated?
If a fuse fails to blow or a cut-off doesn't come into play, the insulation on the wires will melt and cause a short circuit.
What type of motor is used in a starter motor?
None, it is an electric motor In fact, most cars have SERIES connected starter motors - an electric motor where the field windings (the ones that are fitted to the case of the machine and don't move) have the same current flowing in them that the armature (the rotating part of the motor) has. A series motor has very high starting torque, so it's ideal for getting a large lump of scrap metal turning over, but it has poor running (high speed) torque and poor speed control. (Speed control is so poor that if you spin up a starter motor without a load, it may over-speed and possibly throw its windings out of the armature!) Some starter motors use permanent magnets for the field system - these magnets are quite powerful and give the motor good starting torque, and magnet systems are smaller than the series coil systems, and make the starter motor a bit lighter and cheaper. These motors also have a lower top speed at no load, too.
