synchronous motor drive
DESCRIPTION
TRANSCRIPT
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synchronous motor drive
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Wound field motor (a)cylindrical rotor wound field motor (b) salient pole rotor wound field motor Permanent magnet motor Synchronous reluctance motor Hysteresis motor
Classifications of synchronous motor
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Modes of adjustable frequency control (i) Open loop volts/HZ control (or) separate cotrolled
(or) true synchronous mode (ii)self-controlled mode
Adjustable frequency control
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Block diagram
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open loop volts/Hz speed control characteristics
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Fiber spinning Textile and paper mills
appliaction
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Supply Frequency to the synchronous motor is controlled from the inverter which receives its firing pulses from a frequency controlled oscillator.
The machine will exhibits conventional behavior. Up to base speed the motor operates at constant
torque and above base speed are obtained by clamping the voltage at rated voltage. Frequency can be increased and the motor operates in flux weakening region
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Control can modify the angle between the flux
phasors
Because of self-control, machine does not show any
stability or hunting problem of traditional
synchronous machine
The transient response is fast – similar to dc machine
The rotor inertia is smaller than dc machine with high
energy magnet
Self control mode
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Block diagram
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Commutation of the converter feeding the motor is controlled through the rotor position information from a shaft encoder.
Under over excitation the motor voltages can be employed to commutate the thyristors at the inverter. Now the inverter becomes simple. But at low speeds commutation assistance is required.
Rotor position is sensed and the firing signals to the devices are synchronized to the motor position.
For every 600 rotation of the rotor a new device in the sequence is fired
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Closed loop control
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VSI fed Synchronous Motor drive
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Different schemes of vsi fed synchronous motor drive
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CSI fed Synchronous Motor drive
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Cycloconverter fed Synchronous Motor drive
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A Synchronous motor in self controlled mode is called “commutator less Dc motor”.
commutator less Dc motor