THE DC MOTOR ADVANTAGE
Added: (Wed Jul 10 2019)
Pressbox (Press Release) -
DC motors and DC converters/drives are still widely used in industries. It is worth noting that Alternating-current (AC) motors have significantly decreased DC motor sales, and they do come with many advantages used in some applications.
DC Motor Designs
Some of the most popular DC Motors (Gleichstrommotoren)designs include Permanent magnet, Brushless, Shunt, and Series Compound wound or stabilized shunt.
All these designs work similarly. This is evident when a current-carrying conductor is placed in a magnetic field. Power is then applied through these conductors, causing the motor to rotate. Hence, the difference in these designs is the manner and position in, which the electromagnetic fields are generated, in either the stator or rotor. The stator in a permanent-magnet motor is stationary and mounted onto the motor frame. It holds together the permanent magnets, which have been attached firmly to the rotating current-carrying conductors situated in the rotor.
The current required the motor to rotate (mechanical force), is induced when a voltage is applied through the brushes contacting the armature on the rotor. Thereby, when two wires are connected to the motor, and the required amount of DC voltage applied, the engine will run. Stabilized-shunt motor designs have been connected electrically using a rotor, through a brush and commutator. This acts in the form of a switch, which applies a voltage to different coil areas of the rotor as it rotates. However, this configuration is entirely different in motors with AC induction and DC brushless, as the magnetic field is typically generated in the fixed stator. The coils are also located in the fixed stator, instead of being integrated into the spinning rotor. The magnets have also been mounted in the rotor, as opposed to the stationary stator, as in aDC-Motoren. This design provides for the elimination for the provision of electrical connections, through brushes in AC induction and DC brushless motors. This is because the magnetic field is rotated contrary to the current-carrying conductors. Thus, the rotor carrying the permanent magnets is then forced to a motion by the current and related magnetic field, which has been generated by the AC voltage, fed to the stator windings.
Why DC?
DC Motors (Gleichstrommotoren)are easy to maintain or afford, compared to inverter-duty AC motors and drives. This is practically evident when it comes to fractional hp applications. DC motors have also been there since time immemorial and as a result, have a large user base and corresponding widespread familiarity in terms with their operation and maintenance. For motors already installed, it is straightforward to replace a DC motor with a brand new one. Contrary to redesigning, the motor circuit to use an AC motor and drive. This could prove to be very cumbersome and more expensive. To drive the point further, the simple and easy to operate design of DC motors makes it easier to service, maintain and control. There is also no need for field excitation because it is also straightforward for the typical industrial technician to grasp the concept. Speed control is also effortless to understand. All you have to do is change the terminal voltage, using a potentiometer.
Find more information relating to Gleichstrommotoren, and DC Motors here.
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Powertronic Drive Systems GmbH
power-tronic.com
Hartmannstr, Berlin, Germany 12207
Phone: +49 30 7719635
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Submitted by:Powertronic Drive Systems GmbH