Monday, 23 March 2015

Types of Motor Starting Methods

Types of Motor starting Methods,motor speed control,frequency control,voltage control for motor,auto transformer speed control,winding control for motor


Motor starting methods 

MethodAdvantagesDisadvantages
Across - the - LineSimple, Cost-EffectiveHigh Current Inrush
High Starting Torque
Abrupt Start
Reduced-voltage autotransformerHigh output torque vs. starting current.
Some Flexibility in starting characteristics due adjustable taps on auto-transformers
Limited duty cycle
Large equipment size due to autotransformers
Reduced-Voltage Resistor or ReactorHigh output torque vs. starting currentLimited duty cycle
Limited flexibility in starting characteristics
Higher inrush current than with reduced-voltage autotransformer
Large equipment size due to resistors/reactors
Wye-DeltaRelatively low inrush current
Relatively simple starter construction
Good for long acceleration times
Relatively low output torque vs. starting current
Limited flexibility in starting characteristics
Requires special motor construction
Part-WindingRelatively Simple starter constructionRelatively low output torque vs. starting current
Not suitable for frequent starts
Requires special motor construction
Solid-state soft starterSmooth Acceleration
Low inrush current
High flexibility in starting characteristics
Typically offers deceleration control also
Typically integrates with industrial automation
infrastructure
Relatively Expensive
Sensitive to power quality
Heat dissipation and ambient temperature are a concern
Rotor ResistanceSmooth acceleration available
Good flexibility in starting characteristics
Can be used for speed control also
Complicated controller design
Requires expensive wound-rotor motor construction
Adjustable
Speed Drive
Smooth Acceleration
Low inrush current
High flexibility in starting characteristics
Offers deceleration and speed control also
Typically integrates with industrial automation
infrastructure
Cost-prohibitive unless speed control is required also
Sensitive to power quality
Heat dissipation and ambient temperature are a concern
Continuous harmonic currents can create power quality issues

Ref:  http://electrical-engineering-portal.com/comparison-of-motor-speed-control-methods?utm_source=Technical+Articles&utm_campaign=e9ea0b385f-RSS_EMAIL_CAMPAIGN_MAILCHIMP&utm_medium=email&utm_term=0_ae069f0d91-e9ea0b385f-320603685