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Thyristors control motor speed by regulating the voltage applied to the motor, which in turn affects its speed. By using phase control techniques, thyristors can adjust the point in the AC cycle at which they are triggered, effectively reducing the average voltage supplied to the motor. This results in a decrease in power and speed. Additionally, thyristors can be employed in various configurations, such as inverters or chopper circuits, further enabling precise speed control in different types of motors.
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How to control speed of dc motor using microprocessor 8085?
Here the DC motor is controlled by the microprocessor (8085). The kit used was dynalog 8085 kit. The DC motor is very difficult to control unlike the stepper motor, which can be controlled by giving the appropriate CONTROL WORD. By knowing the DC motor theory we know the different methods used to control the motor, the most primitive and the once upon a time the most popularly method was WARDLEONARD motor speed control, but this had many disadvantage, so the world of Electronics brought in the thyristor control, which were very flexible and can be employed to use AC instead of DC cause they had a inbuilt convertor. The thyristor-based system is good but when used with Microprocessor based speed controller they are really good. We have shown the block diagram, circuit diagram used by us to control a small tape recorder sized motor
Why sawtooth waveform is used in thyristor triggering circuit?
A sawtooth waveform is used in thyristor triggering circuits because it provides a linear and predictable voltage ramp, allowing for precise control over the timing of the thyristor's conduction. The waveform's rising edge can be synchronized with the zero-crossing of alternating current (AC), enabling accurate phase control in applications like dimming and motor speed control. Additionally, the sawtooth waveform facilitates the generation of a trigger pulse at a specific point in the AC cycle, ensuring reliable and consistent operation of the thyristor.
What is vf speed control?
It is used for sensorless motor control. With vf speed control u can control speed of any induction motor.
What is the switching speed of thyristor?
25microsec
How thyristor used in induction furnace?
Thyristor is used for Rectifiying and inverting the power supply in induction furnace. The parallel Resonance Coils (Current Control Furnaces) Control the Furance power up to 40% by controlling the firing angle of the rectifier inverter and remaining 60% controlled by inverter thyristor control. In rectifier they are varying the thyristor firing angle from 15 deg to 45 deg. (in sin wave)
How would it be tomake use of Emitter Turn Off Thyristor for speed variation in Pump storage plant?
A thyristor can only control current, and an induction motor speed can only be controlled by the frequency of the supply, for instance if the frequency is 50Hz and it is a 4 pole motor the speed will be 1500 RPM but that is a rms speed the actual speed will be between 1200 and 1400 RPM and a 2 pole motor will run at 2 times that speed. To vary the speed of an induction motor one need to vary the frequency of the supply, the only way to do that is to rectify the mains voltage to DC and then invert it back to a variable AC voltage, preferably a sine wave, else the motor will be noisy. If it is a series motor with brushes the speed can be control d with a thyristor by varying the on cycle of the thyristor. To get a smoother run at low speed two thyristors should be used, one in the field circuit and one in the armature circuit.
How to control speed of dc motor using microprocessor 8085?
Here the DC motor is controlled by the microprocessor (8085). The kit used was dynalog 8085 kit. The DC motor is very difficult to control unlike the stepper motor, which can be controlled by giving the appropriate CONTROL WORD. By knowing the DC motor theory we know the different methods used to control the motor, the most primitive and the once upon a time the most popularly method was WARDLEONARD motor speed control, but this had many disadvantage, so the world of Electronics brought in the thyristor control, which were very flexible and can be employed to use AC instead of DC cause they had a inbuilt convertor. The thyristor-based system is good but when used with Microprocessor based speed controller they are really good. We have shown the block diagram, circuit diagram used by us to control a small tape recorder sized motor
Why sawtooth waveform is used in thyristor triggering circuit?
A sawtooth waveform is used in thyristor triggering circuits because it provides a linear and predictable voltage ramp, allowing for precise control over the timing of the thyristor's conduction. The waveform's rising edge can be synchronized with the zero-crossing of alternating current (AC), enabling accurate phase control in applications like dimming and motor speed control. Additionally, the sawtooth waveform facilitates the generation of a trigger pulse at a specific point in the AC cycle, ensuring reliable and consistent operation of the thyristor.
What is vf speed control?
It is used for sensorless motor control. With vf speed control u can control speed of any induction motor.
What is ignition angle in thyristor?
Ignition angle in a thyristor refers to the specific point in the AC voltage cycle at which the thyristor is triggered to conduct. This angle determines the phase delay between the voltage waveform and the current waveform, influencing the amount of power delivered to the load. Adjusting the ignition angle allows for control over the output power in applications such as light dimmers and motor speed controllers. In essence, it plays a crucial role in phase control techniques.
What is speed controller?
It is used for sensorless motor control. With vf speed control u can control speed of any induction motor.
What is the switching speed of thyristor?
25microsec
How do you control the speed of a pneumatic motor?
The speed is varied by throttling the air flow into the motor.
What is the importance of speed control of DC motor in industrial applications?
The speed control of the DC motor is important because its speed can be changed over a wide variety of simple methods which is not possible in an AC motor.
Speed control of motor using SCR?
An SCR chip is commonly used to control the speed of a motor. The speed is controlled using an AC circuit and phase angles.
What are convectional and non convectional methods of speed control of a induction motor?
The flux control method is the convectional and the non-convectional method of speed control of an induction motor.
Is it possible to reduce speed of shunt motor?
For any dc shunt motor the speed is directly proportional to the armature voltage. hence if you vary the armature voltage by any means( using thyristor ) or static converters using conventional method( ward Leonardo system) surely you can increase or decrease the speed of the shunt motor. Manjunatha M
