Selection criteria of motors for various applications

i didn't saw this case study in slide share thats why uploading this vedio

1. Selection criteria of motors for various applications -by r.pra santh

2. What is a motor ? Device that converts electrical or other energy into mechanical energy or imparts motion Concerned with or involving muscular movement

3. AC Motor: The motor that converts alternating current into mechanical power by using an electromagnetic induction phenomenon. Two parts: stator and rotor Stator: stationary electrical component rotor: rotates the motor shaft Two types S ynchronous motor Induction motor Induction motor classified in to two main groups: Single-phase induction motors Three-phase induction motors

4. S ingle Phase Motor: The main components of a single phase motor are the rotor and stator winding. The rotor is the rotating part, the stator winding helps in rotating the rotor. The winding has got 2 parts; One main winding and an auxiliary winding. The auxiliary winding is placed perpendicular to the main winding. A capacitor is connected to the auxiliary winding . uses: Mostly used in homes and small businesses

5. Three Phase Motor: A 3-phase induction motor has two main parts : a stationary stator and a revolving rotor The operation of a 3-phase motor is based up on the application of Faraday Law and the Loretz force on a conductor

6. DC Motor: It is an electric motor designed to be run from a direct current power source Mainly there are two types of DC Motors Separately Excited  DC Motor Self-excited  DC Motor Self-excited motors are further classified as three types: Shunt motor   Series motor Compound motor

7. Factors To Consider In Selecting Electric Motors A motor must do three things: 1 . Start the equipment load 2 . Drive the load once it is started 3 . Survive the abuse of the surroundings in which it operate

8. Steps to motor selection: Start with two basic parameters Speed Torque Configure motion compass with specific application requirements

9. Type of Power Available 230-volt motor should not be used if only 115-volt circuits are available Three-phase motor cannot be operated on electrical system with only single-phase service Typical Operating Voltages:

10. Size of Motor: Rated in Hp Refers to the power that it will develop when the motor is turning at full speed “Rules of Thumb” for estimating size needed: If equipment can be operated by hand, a 1/4 Hp motor will usually be adequate If gasoline engine is to be replaced by electric motor, an electric motor approximately 2/3 the Hp rating of the engine will be adequate Replace tractor PTO with an electric motor of approximately the same Hp

11. Starting Load: S elected motor must produce adequate starting torque to start the load Commonly–used motors: Split phase Capacitor start-induction run Capacitor start-capacitor run Repulsion start-induction run Series or universal Shaded pole Three-phase Capacitor start-induction run & Three-phase are the most common and produce highest starting torque

12. Speed Requirement: Rated at the speed the shaft will turn in revolutions per minute (rpm) when motor is operating at full speed Rpm of motor should be speed needed to operate equipment at proper speed Bearing type Sleeve bearings OR Anti-friction bearings Require less maintenance and can be mounted in any position

13. Base Type: Rigid base Sliding adjustable base Cushion mount Reduces vibration & wear Determined by application of motor

14. Environment: Provide proper protection from surroundings Typical motor enclosures: Open drip proof Splash proof Totally enclosed-fan cooled (TEFC) Explosion proof Totally enclosed-air over (TEAO) Totally enclosed-non ventilated (TENV)