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a) Change the direction of current flow through the fields
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∙ 11y ago
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Can you reverse the wiring to make the fan reverse?
Yes if it's a dc motor with a permanent magnet field, or if it's a 3-phase ac motor. No if it's a single-phase ac motor or a dc motor with a field winding in series or parallel with the armature. <<>> Single phase AC motors can be reversed by using a reversing switch. Reverse either the start winding or the run winding connections but not both.
You switched leads on your 3phase motor and it did not reverse?
Then it is not a three phase motor.
How do you make an AC motor go in forward and reverse?
If it is a three phase motor just interchange any two of the three wires. If it is a single phase motor, which is also known as a split phase induction motor, it has two sets of coils and a centrifugal start switch. The start winding is in series with the start switch. The start winding provides a rotating magnetic field in one direction enabling the motor to start. The motor can be reversed by reversing the connections of either the start winding or the run winding but not both.
How do you reverse single phase motor?
A single phase induction motor has two sets of coils and a centrifugal start switch. The start winding is in series with the start switch. The start winding provides a rotating magnetic field in one direction enabling the motor to start. The motor can be reversed by reversing the connections of either the start winding or the run winding but not both.
How do you change rotation of 6K709C dayton jet pump motor?
Interchanging the red and black leads in the motor's motor junction box will reverse the direction of rotation on the motor.
What different types of DC motor are there?
Series wound. Parallel wound. Series/parallel or Compound wound.
To replace 7.5 kw 400dc1750 rpm motor with an equivalent ac motor which produce eq. torque then what should be the rating of motor?
What kind of DC Motor? Different motors have different torque DC Motor Types * Permanent Magnet: No field coils at all. * Series Wound: the field coils are connected in series with the armature coil. Powerful and efficient at high speed, series wound motors generate the most torque for a given current. Speed varies wildly with load, and can run away under no-load conditions. * Shunt Wound: the field coils are connected in parallel with the armature coil. Shunt wound motors generate the least torque for a given current, but speed varies very little with load. Will not run away under no-load, but may if the field windings fail. * Compound Wound: a combination of series and shunt wound. This is an attempt to make a motor that will not run away under no load or if the field fails, yet is as efficient and powerful as a series wound motor. * Check this link: http://www.reliance.com/prodserv/motgen/b7096.htm
How are the series and shunt field windings of the compound wound dc motor connected relative to the armature?
series field in series with the armature shunt in parallel with the voltage supply the shut field increases the strength of the magnetic field with heavy loads to reverse the motors direction the fields remain the same you swap the armature leads
Why will unloaded series-wound motor over-speed?
yes and very quickly too. maybe 2 seconds
Is torque and current proportional?
Sometimes, for example in a separately excited dc motor. But in a series-wound dc motor the torque is proportional to current-squared, which gives the motor a very high starting torque and this makes series motors very popular for traction.
Why is DC series motor is used more than shunt wound DC motor?
Series DC motor develops a very large amount of turning force called torque from standstill and can be operated by using either an AC or DC power source.
When using the emergency bandage what should you do once the elastic bandage is placed thru the pressure bar?
reverse wrapping direction and continue bandaging the wound
Explain starting of a wound rotor induction motor?
explain wound rotor
Basic principle of commutator motor meter?
It is based dynamometer principle with ironless motor with a wound armature having a commutator. The two coils are connected in series with supply and armature coil is connected in parallel to it.
Which motor has a higher starting torque?
A series-wound commutator motor has the best starting torque because the torque is proportional to the square of the current, and the starting current is set by a current-limiting resistor which is switched out as the motor builds up speed.
Why will an unloaded series-wound motor overspeed?
The Torque Speed characteristics of a series connected dc motor is such that at zero load the speed is "infinite"! ie it over runs and can burn out/explode! The characteristics are quite easy to derive from the basic equations of a dc motor but you can see them in most text books on electrical machines.
How do you change the direction of a 3-phase induction motor?
Reverse any two line leads connected to the motor will reverse the directional rotation of the motor
