Motor_Drive

Motor_Drive - MotorDrive MotorDrive...

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Motor Drive Motor Drive
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    Modern Variable Speed System    A modern variable speed system has four components:     1. Electric Motor    2. Power Converter        - Rectifiers        - Choppers        - Inverters        - Cycloconverters
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      Modern Variable Speed System (Contd’)    3. Controllers – matching the motor and              power converter to meet the load   requirements    4. Load
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Electric Motors Types of electric motors presently used for speed  control applications are: 1. DC motors     Shunt     Series     Compound     Separately excited     Switched reluctance motors
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Electric Motors (Contd’) 2. AC motors     Induction     Wound rotor synchronous     Permanent magnet synchronous     Reluctance motors
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         Motor Selection   1. Cost    2. Thermal capacity  3. Efficiency  4. Torque-speed profile  5. Acceleration  6. Power density, volume of the motor  7. Ripple, cogging torque  8. Peak torque capability   
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               Motor Selection (contd’)    9. Suitability for hazardous environment  10. Availability of spare parts   Cog: Mechanical transmission             Gear             Toothed wheel 
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Electric Motors (contd’) For position servo applications:  • The peak torque and thermal capabilities together with  ripple and cogging torques are important  characteristics for servo application • Higher peak torques decrease the  acceleration/deceleration times • Minimum cogging and ripple torques help to attain  higher positioning repeatability and higher thermal  capability leading to a longer motor life and a higher  amount of loading
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The power converters driving the motors are:   1. Controlled Rectifiers    Controlled rectifiers are fed from single and three- phase AC main supply.  V
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This note was uploaded on 01/30/2011 for the course EE 425 taught by Professor Jenniferzirnheld during the Spring '10 term at SUNY Buffalo.

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Motor_Drive - MotorDrive MotorDrive...

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