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the motor should only rotate in a rated speed,if the speed is more than rated speed then the motor will be damaged........to control the speed of motor a rheostat should be connected to the field side of motor......by variying the rheostat we can control the speed of motor......
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∙ 13y ago
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∙ 16y ago== == voltage in the windings does NOT control the speed of a motor, but the armature voltage does.
on DC motors speed can controlled by varying the resistance of the field winding or the armature voltage
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∙ 9y agoThe speed depends on the supply frequency so synchronous motors are not used if variable speed is required. They are normall used in high-power continuous use at a constant speed where it is important to have a good power factor.
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∙ 10y agoDC motor produces quite a large amount of back EMF(counter EMF) when it rotates.
If the speed of the DC motor is not controlled the counter EMF and the induced currents may damage the windings.
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∙ 11y agoone of the way is by closed loop control by applying various vector control methods.
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∙ 13y agoby varying the amount of current flowing to the motor
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∙ 11y agospeed only changes with frequency or load
no load is near synchronous speed
high load far more slip
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∙ 11y agoA combination of inductor and diode/s to suppress part of the sine wave while limiting current.
Examples: Light dimmer and fan speed controller.
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Where ac voltage controllers are used?
AC voltage controllers are used for controlling the speed of universal motor or induction motor by changing the firing angle :) -vinodh gav
How do you change the speed of motor without change pole and frequency?
On an AC motor you basically vary the frequency on a DC you can vary the voltage.
Is it possible to increase speed of AC Slip Ring Induction Motor?
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What is the meaning of a c drive?
An AC drive is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage. AC drives are used in applications ranging from small appliances to the largest of mine mill drives and compressors.
What type of motor is used in ac servometer?
ac motor
Why ac drive convert ac voltage in dc?
It is done to control the speed of the motor.
How do you control the speed on an ac motor?
the speed of ac motor can be controlled by controlling the synchronous speed (Ns=120f/p). and synchronous speed can be varried or controlled by changing frequency or by changing poles. but practicaly pole can not be changed. but we can change the frequency. the frequency can be VFD (Variable frequency Drives). so the speed of ac motor can be chaged or controlled by VFD.
What determines the speed of an AC motor?
The higher the frequency the higher the RPM the motor will turn
Can a DC series motor with speed control be connected on AC supply?
A dc series motor with speed control can be connected on ac supply because dc machines are totally reversible.
How does an ac drive variable speed drive operate to control speed?
Answer #1 It varies the frequency fed to a synchronous AC motor. As the frequency changes, so does the motor speed. Answer #2 The formula for calculating speed is: (120 X motor supply frequency) / number of poles 120 is a fixed number, so is the number of poles for a given motor, hence the only variable is the motor supply frequency. AC drives vary the motor supply frequency in turn achieving speed control.
What is a motor design that works with either an AC source or a DC source?
A variable speed module in a motor can work with ac or dc source
What type of ac motor will operate at a constant speed from no load to full load?
The Synchronous motors will operate at a constant speed from noload to fullload. Even it is classified as an AC motor, we have to fed the motor both AC and DC supplies. That we have to supply DC to the Field (Normally Rotor) and AC to the Armature (Normally Stator).
What is ac drive and how it works?
An AC Drive used for a speed control of a motor by using vary frequency.
What is the difference between Variable Speed Drive and Variable Frequency Drive?
A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFD's vary the speed of an AC motor by varying the frequency to the motor. VSD's referring to DC motors vary the speed by varying the voltage to the 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 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.
Where ac voltage controllers are used?
AC voltage controllers are used for controlling the speed of universal motor or induction motor by changing the firing angle :) -vinodh gav
