State the various applications of synchronous motor.

Various applications of synchronous motor : 

• It is capable of being operated under a wide range of power factors, both lagging and leading. Hence, it can be used for power factor correction purpose. 
• In textile industry high speed drives are necessary with wide range of control. Variable frequency drives with synchronous motors are used for speed control. 
• In chemical industry, rubber industry and petrochemical industry, many processes require compressor drives in which direct coupled synchronous motors supplied by frequency converters are used. 
• An artificial fibre plant needs variable frequency synchronous motor and are supplied by static frequency converters. 
• Synchronous motor is also useful for voltage regulation.

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What are the applications of DC motor?

Applications of DC motors:
Type of motor	Applications
Series Motor	For traction work, i.e electric locomotives, Rapid transit system, trolley cars etc Cranes and hoists Conveyors
Shunt motor	For traction work, i.e electric locomotives, Rapid transit system, trolley cars etc Cranes and hoists Conveyors
Cumulative Compound	For intermittent high torque loads For shears and punches Elevators Conveyors Heavy planers Rolling mills: Ice machine: Printing Presses: Air Compressors

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What are the two advantages of stepper motors? Give a few applications of them .

Advantages of stepper motors:

• They can be directly controlled by computers, micro-processors and programmable controllers.
• Precision control of speed without using closed loop feedback. 

Applications: 

i) Operation control:

Such motors used for operational control in computer peripherals, textile  industries, IC fabrications and robotics etc.

ii) Incremental motion: 

Applications requiring incremental motion are typewriters, line printers, tape drivers, floppy disk drivers, numerically controlled machine tools, process-control systems and X-Y plotters.

iii) Others:

It includes commercial, military and medical applications where these motors  perform functions as mixing, cutting, striking, metering, blending and purging.  They also take part in manufacture of packed food stuffs, commercial end products and even the production of science fiction movies.

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Why does a practical transformer draw some current when its secondary winding is open?

Transformer practically draws some current when its secondary winding is open due to primary circuit and this current will produce core losses. 

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What is a Stepper Motor? What are the application of stepper motor?

Stepper Motor

The stepper motor is a motor which takes input pulses and then takes proportional steps to input these signals. You can use for positioning and/or speed control for most any applications.

Stepper motor with cable

The stepper motor needs a power circuit and a sequence circuit for changing phase.

Applications

• Medical: Infusion Pump, Brad Test, X-ray, Dialysis, DNA Extraction, Pump 
• Semiconductor: Masking, Etching, Wafer Handling, Test-equipment, Die-Bonder 
• FA: Pick & Place, NC Machine, X-Y-Z stage 
• OA: Printer, Fax, Scanner 
• HA: HVAC, Cleaner Robot 
• Other: Vending machine

Related Question: What is a Stepper Motor? What are the application of stepper motor?

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