What is brake test on DC shunt motor?
Concept of Brake test: It is a direct method to determine the efficiency of DC motor. It consists of applying a brake to a water-cooled pulley mounted on the motor shaft as shown in fig. The brake band is fixed with the help of wooden blocks gripping the pulley.
How do you test a DC shunt motor?
first test the field winding with a megohmmeter to check, that the winding has no short to the housing. Then check the current consumption of the field winding. If you can, start with a low voltage and rise it until you reach the nominal voltage. Look for the maximum current at the specification plate.
How the braking is done in DC shunt motor?
One method commonly employed to bring the rotating system to rest is to disconnect the motor from the line and reconnect it across a resistor. The shunt field remains connected to the line so that the motor acts as a generator driven by the stored energy in the load. This method is known as dynamic braking.
What is braking of DC motor?
DC injection braking is a method of braking in which direct current (DC) is applied to the stationary windings of an AC motor after the AC voltage is removed. This is an efficient and effective method of braking most AC motors.
What is meant by brake test?
A brake check, also known as a brake test, occurs when a driver deliberately either taps on the brakes several times or slams hard on the pedal when moving in front of another vehicle, with the intention of causing the behind driver to either collide or take evasive action.
What is the use of brake test?
A brake test is a deceleration test carried out between two speeds. Data taken during the test is used to calculate the time taken and distance travelled. A trigger can be used to measure the point of activation of the brake pedal.
What are the characteristics of DC shunt motor?
Characteristics of a DC Shunt Motor:
- Speed-Armature Current Characteristic:
- Torque-Armature Current Characteristic:
- Speed-Torque Characteristic:
- Break in Field Circuit of a DC Motor:
What is braking explain its types?
But we can divide braking in to three parts mainly, which are applicable for almost every type of motors. Regenerative Braking. Plugging type braking. Dynamic braking.
What is braking in motor?
Plugging induction motor braking is done by reversing the phase sequence of the motor. Plugging braking of induction motor is done by interchanging connections of any two phases of stator with respect of supply terminals. And with that the operation of motoring shifts to plugging braking.
Why do we do brake test?
It is often used as a warning that you are following too close, or if the driver is undergoing a road rage incident because (rightly or wrongly) he or she is annoyed at your driving. Brake testing is not where the driver in front of you brakes heavily genuinely. Brake testing is extremely dangerous.