Speed Control of DC Motor: Armature Resistance Control and Field Flux Control. In this method, a variable resistor Re is put in the armature circuit. A DC motor is used to convert the direct current (DC) electrical power into mechanical power based on the forces produced by magnetic filed(s). The number of wire turns in an armature, the operating voltage of the motor, and the strength of the magnets all affect motor speed.

The connection diagram of a shunt motor of the armature resistance control method is shown below. Note: Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search. The speed current characteristic of the shunt motor is shown below. A coil is placed in a magnetic field, and when an electric current passes through the coil, a torque is produced, causing the motor to turn. (For more information on slip,  check out our blog Synchronous & Induction Motors: Discovering the Difference.). Contact us at 800-829-4135 or by email at sales@groschopp.com. Flux is produced by the field current. The rotor will always rotate slower than the magnetic field of the stator and is playing a constant game of catch up. By varying the armature circuit resistance, the current and flux both are affected. Light gray represents options not available with previously selected criteria. The reduction in field current reduces the amount of flux and as a result the speed of the motor increases. A portion of the main current is diverted through a variable resistance Rd. To learn more about adding a reducer, check out Part 2, “Motor Speeds Explained: When to Use a Gearbox.”. Such type of control is impossible in an AC motor.

If you have any questions regarding your results or how to use the search tool, you can chat with us using the green tab on the left-hand side of your screen. It is helpful for search any topics. The speed of an AC motor is dependent on the number of poles it has and the line frequency of the power supply, not on it’s voltage.

The flux cannot usually be increased beyond its normal values because of the saturation of the iron. The voltage drop in the variable resistance reduces the applied voltage to the armature, and as a result, the speed of the motor is reduced. The speed of DC Motor is given by the relation shown below: Here equation (1) shows the speed is dependent upon the supply voltage V, the armature circuit resistance Ra and the field flux ϕ, which is produced by the field current. Required fields are marked *. This site uses cookies.

The comparison given in Tables 1.1 and 1.2 is based on the following aspects: COPYRIGHT © 2014 TO 2020 EEEGUIDE.COM ALL RIGHTS RESERVED, Speed Control of Variable Frequency Induction Motor, Closed Loop Speed Control of Multi Motor Drives, Closed Loop Speed Control of Induction Motor Drives, Speed Control Using Slip Energy Recovery Schemes, Control System Design of Microprocessor Based…, Synchronous Speed on Variable Frequency Supply, Variable Speed Constant Frequency Generator, Field Oriented Control of Induction Motor, Field Oriented Control of Three Phase Induction Motor, Microprocessor Control of Synchronous Motor Drives, Microprocessor Control of a Current source Inverter…, Single Phase Fully Controlled Rectifier Control of DC Motor, Dual Converter Control of DC Separately Excited Motor, Chopper Control of Separately Excited DC Motor, Power System Protection Important Questions, Voltage Source Inverter Fed Synchronous Motor Drive, Condition for Reciprocity of a Two Port Network, Condition for Symmetry in Two Port Network, Programming Techniques in Microprocessor 8085, Half Subtractor and Full Subtractor Circuit, Variation of armature voltage by inserting an additional resistance in the, Smooth variation of applied voltage using conventional Ward Leonard control or static Ward Leonard control employed for separately excited dc, Variation of field current either by inserting a resistance in the field circuit or by varying the field voltage using thyristor, Limit or range of speed control (Hardness of speed control).

Therefore, speed control by flux is limited to the weakening of the field, which gives an increase in speed. DC Motor Speed Control: In the foregoing sections we discussed the torque-speed characteristics of dc motors, bringing out the effects of armature voltage variation and field current on them. DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). For a given value of variable resistance, the speed reduction is not constant but varies with the motor load. Now, if you connect that same 12 VDC motor into a 24 VDC power source, your speed typically doubles. The output of the motor is mechanical power in terms of rotation (speed) of the shaft. In a standard (brushed, permanent magnet) DC motor, torque is directly proportional to current.

Note that torque is inversely proportioal to the speed of the output shaft. In this two-part blog, we’ll dive into the specifics of motor speeds. This speed control method is used only for small motors. Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors. For every motor, there is a specific Torque/Speed curve and Power curve.
Armature Voltage Control of DC Motor; For controlling the speed of DC Motor, the variation in voltage, armature resistance and field flux is taken into consideration.


In speed regulation, the speed of the motor changes naturally whereas in dc motor the speed of the motor changes manually by the operator or by some automatic control device. Also update the ‘searching tabs ‘ . For controlling the speed of DC Motor, the variation in voltage, armature resistance and field flux is taken into consideration.

The second method used in a series motor for the variation in field current is by tapped field control. This type of arrangement is used in an electric traction system. A magnetic field is created in the stator poles that induces resulting magnetic fields in the rotor which follow the frequency of the changing magnetic field in the stator. Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search.

A comparison of these methods bringing out their salient features may prove worthwhile. To learn more about adding a reducer, check out Part 2, “Motor Speeds Explained: When to Use a Gearbox.”. At least five problem on each topics. Static Ward Leonard control using either phase controlled rectifiers or choppers has now become very popular. Use the slider corresponding to your dominant variable to further narrow your motor selection.

In other words, there is a tradeoff between how much torque a motor delivers, and how fast the output shaft spins. A large amount of power is wasted in the external resistance Re.

There is a search box above facebook page. Select a dominant variable: choose one of the three parameters to narrow your search.

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