State the most commonly method used in industry for speed control of induction motor

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Now let us discuss in detail, the most common form of induction motor, the “Squirrel cage" induction motor. The reason for the name “Squirrel cage" is because of the type of rotor used in these motors. Almost 95% of the induction motors used is of squirrel cage type. Wound-rotor motors deliver speed control of heavy and high-torque loads.What's special about the wound-rotor motor? This type of 3-phase induction motor has high starting torque, which makes it ideal for applications where standard NEMA design motors fall short. The wound-rotor motor is particularly effective in applications where using a squirrel-cage motor may result in a starting current that's Speed Control of Induction Motor by Variable Frequency Control Variable Frequency Control is a method which is used to control the speed of an induction motor. The synchronous speed and therefore, the speed of the motor can be controlled by varying the supply frequency.The synchronous speed of an induction motor is given by the relation shown below. This method is very frequently used because it is very simple and economic. In this method the speed control can be achieved by varying the flux Φ, because the motor speed N ∝ (1/ Φ) and therefore it is named flux control method. Along with the shunt field winding an adjustable resistance is connected in series as shown in the figure. This method is very frequently used because it is very simple and economic. In this method the speed control can be achieved by varying the flux Φ, because the motor speed N ∝ (1/ Φ) and therefore it is named flux control method. Along with the shunt field winding an adjustable resistance is connected in series as shown in the figure. 11. SPEED CONTROL OF INDUCTION MOTORS The speed of an induction motor is given as N = 120f/p (1-S). So obviously the speed of an induction motor can be controlled by varying any of three factors namely supply frequency f, number of pole P or slip S. The main methods employed for speed control of induction motors are as follows: 1. Pole changing 2. The term variable-frequency drive is often used interchangeably with AC drive, inverter, or adjustable- frequency drive (AFD). The two most common circuits for adjusting the speed of an AC squirrel cage induction motor are the inverter and the cycloconverter. Dec 19, 2015 · Once the motor picks up the speed, this additional winding is removed from the supply. This is the basic principle followed by all these types of single phase induction motors. Let us discuss these types of motors in brief. Split Phase Induction Motor. This is one of the most widely used types of single phase induction motors. By using PWM strategies, in the reference [4][5] inverter is used to drive the speed of induction motor, AC choppers are used in the reference[6][7] for the speed control of induction motor. In the reference [3][8][9] Ac chopper are used to obtain variable rms voltage from fixed voltage and frequency sources. Oriental Motor offers three product groups (AC speed control motors, brushless DC speed control motors, and inverter units) for use in a wide range of speed control applications. The proper speed control product can be selected according to the function, the performance, the cost, and the purpose desired for your application. This paper investigates the development of a simplified speed control of induction motor based on indirect field oriented control (FOC). An original PI-P controller is designed to obtain good ... Aug 13, 2017 · Explaining the speed control method used in common fans... Specifically shaded pole motors, and permanent split capacitor (PSC) motors. This was a common question during my "How Motors Work ... Induction motors, especially those of the squirrel-cage type, are the most common sources of mechanical power in industry. Supplied from a three-phase AC line, induction motors are simple, robust, and inexpensive. Although most motors operate with a fixed frequency resulting in an almost constant speed,... The Wound rotor induction motors are also used for loads having high inertia, which results in higher energy losses. Used for the loads which require a gradual buildup of torque. Used for the loads that require speed control. The wound rotor induction motors are used in conveyors, cranes, pumps, elevators and compressors. Dec 19, 2015 · Once the motor picks up the speed, this additional winding is removed from the supply. This is the basic principle followed by all these types of single phase induction motors. Let us discuss these types of motors in brief. Split Phase Induction Motor. This is one of the most widely used types of single phase induction motors. The most common type of rotor is the squirrel cage rotor. The rotor comprises of a cylindrical laminated core with axially placed parallel slots for carrying the conductors. Each slot carries a copper, aluminum, or alloy bar. The rotor of three-phase induction motors frequently is likewise implied as an anchor. Motors & Drives; High-Speed Motor and Encoder Pair Has Resolutions Down to 1.25 µm. Two new direct-drive linear motors in Moticont's SDLM line feature a linear optical quadrature encoder to ... Motors & Drives; High-Speed Motor and Encoder Pair Has Resolutions Down to 1.25 µm. Two new direct-drive linear motors in Moticont's SDLM line feature a linear optical quadrature encoder to ... Now let us discuss in detail, the most common form of induction motor, the “Squirrel cage" induction motor. The reason for the name “Squirrel cage" is because of the type of rotor used in these motors. Almost 95% of the induction motors used is of squirrel cage type. 11. SPEED CONTROL OF INDUCTION MOTORS The speed of an induction motor is given as N = 120f/p (1-S). So obviously the speed of an induction motor can be controlled by varying any of three factors namely supply frequency f, number of pole P or slip S. The main methods employed for speed control of induction motors are as follows: 1. Pole changing 2. Jan 09, 2017 · This is the cheapest and easiest method, but it is rarely used because of the below reasons. A small change in speed requires a large change in voltage. This large change in voltage will result in a large change in the flux density. Speed control by varying Rotor Resistance: This method is applicable to three-phase slip-ring induction motor only. 11. SPEED CONTROL OF INDUCTION MOTORS The speed of an induction motor is given as N = 120f/p (1-S). So obviously the speed of an induction motor can be controlled by varying any of three factors namely supply frequency f, number of pole P or slip S. The main methods employed for speed control of induction motors are as follows: 1. Pole changing 2. 3.3 Different Speed Control Methods From equation 3.18, the speed of IM can be varied by varying the slip ‘S’ or number of poles ‘p’ or frequency of supply. The different methods of speed control of induction motor can be broadly classified in to scalar and vector control methods. In this work, scalar control methods are used. 3. Constant V/F control of induction motor This is the most popular method for controlling the speed of an induction motor. As in above method, if the supply frequency is reduced keeping the rated supply voltage, the air gap flux will tend to saturate. This will cause excessive stator current and distortion of the stator flux wave. 3. Constant V/F control of induction motor This is the most popular method for controlling the speed of an induction motor. As in above method, if the supply frequency is reduced keeping the rated supply voltage, the air gap flux will tend to saturate. This will cause excessive stator current and distortion of the stator flux wave. 3. Constant V/F control of induction motor This is the most popular method for controlling the speed of an induction motor. As in above method, if the supply frequency is reduced keeping the rated supply voltage, the air gap flux will tend to saturate. This will cause excessive stator current and distortion of the stator flux wave. That means, if the applied voltage is 50% of the rated value, the starting torque will be only 25% of its normal voltage value. This method is generally used for a smooth starting of small induction motors. It is not recommended to use primary resistors type of starting method for motors with high starting torque requirements. the question is incorrectly stated, DC motors are totally different from induction motors. To control the speed of DC motors: there are three methods, you can control the armature voltage, or armature resistance, or field resistance. Now let us discuss in detail, the most common form of induction motor, the “Squirrel cage" induction motor. The reason for the name “Squirrel cage" is because of the type of rotor used in these motors. Almost 95% of the induction motors used is of squirrel cage type. Methods of Speed Control of Induction Motor. Out of all the electrical machines, Induction Motor is the most used machine in industries. More than 90% of motors used in industries are squirrel cage induction motor due to its rugged and maintenance free design. The term variable-frequency drive is often used interchangeably with AC drive, inverter, or adjustable- frequency drive (AFD). The two most common circuits for adjusting the speed of an AC squirrel cage induction motor are the inverter and the cycloconverter. Wound-rotor motors deliver speed control of heavy and high-torque loads.What's special about the wound-rotor motor? This type of 3-phase induction motor has high starting torque, which makes it ideal for applications where standard NEMA design motors fall short. The wound-rotor motor is particularly effective in applications where using a squirrel-cage motor may result in a starting current that's Motors & Drives; High-Speed Motor and Encoder Pair Has Resolutions Down to 1.25 µm. Two new direct-drive linear motors in Moticont's SDLM line feature a linear optical quadrature encoder to ... Nov 23, 2015 · It is the most commonly used reduced voltage starter as it is the cheapest starter among all. In this method, induction motor is connected in star during start and delta while running with rated speeds. These starters are designed to run on delta connected stator of an induction motor. The schematic diagram of this starter is shown in figure below.