Topics: motor. At Mader Electric, our highly trained technical professionals' top priority is keeping your motor and control systems running efficiently. Contact Us. Hours 7am-5pm and any hour that you need us! Quick Links. Motor Repair.
Pump Repair. Controls and Automation. Machine work and Custom Fabrication. Training Programs. Web Design and Inbound Marketing by Nextiny. Get in touch Send us a message. Posts by Author:. AC Synchronous Motor This type of motor majorly depends on a 3-phase power supply.
More Types of Motors Servo Motors These are motors joined with feedback sensors to aid in positioning, thus the key to robotics. Brushless motors are also available with a feedback device which allows the control of the Speed, Torque and Position of the motor and the intelligent electronics control all three so, if more torque is required to accelerate quickly to a certain speed then more current is delivered, these are known as Brushless Servo Motors.
I have mastered domestic and industrial Electrical installations and Thier fitting accessories But Today with automentation evolving and rolling Technological error I find my carrier lagging Iam very great greatful of these imploring opportunity appreciate these lull of Expertise. Different types of motors and their use Follow article.
AC Motors AC motors are highly flexible in many features including speed control VSD - Variable Speed Drives and have a much larger installed base compared to DC motors, some of the key advantages are: Low power demand on start Controlled acceleration Adjustable operational speed Controlled starting current Adjustable torque limit Reduced power line disturbances The current trend for VSD is to add more features and programmable logic control PLC functionality, which add advantages but require greater technical expertise during maintenance.
Click here for an example of an AC Motor from RS Types of AC motor include: Synchronous In this type of motor, the rotation of the rotor is synchronized with the frequency of the supply current and the speed remains constant under varying loads, so is ideal for driving equipment at a constant speed and are used in high precision positioning devices like robots, instrumentation, machines and process control Click here for an example Synchronous Motor from RS Induction Asynchronous This type of motor uses electromagnetic induction from the magnetic field of the stator winding to produce an electric current in the rotor and hence Torque.
Click here for an example Induction Motor from RS DC Motors DC motors were the first type of motor widely used and the systems motors and drive initial costs tend to be typically less than AC systems for low power units. Applications include automotive, hoists, lifts and cranes as it has a high starting torque.
Shunt Wound — This type has one voltage supply and the field winding is connected in parallel with the rotor winding and can deliver increased torque, without a reduction in speed by increasing the motor current. The rotation provides mechanical work to drive other rotating machines such as pumps.
Standard frame sizes are available over a range of powers to ease interchangeability. Enclosures can range from simple open designs to explosion-proof, non-ventilated designs, with totally enclosed, fan-cooled TEFC being common. An international rating system also prescribes the levels of cooling and protection. AC motors form a large portion of motors in use today and drive pumps, fans, compressors, etc.
Sizes range from sub-fractional horsepower machines to 20, HP plus-sized units with metric sized units similarly available. AC motors will be either single- or three-phase. Three-phase machines are categorized by rotor design, either squirrel cage or wound rotor. Squirrel- cage designs use copper or aluminum rotor bars shorted by end rings and are, in a sense, true induction machines—a kind of rotating transformer. Wound rotors use wire-wound rotor poles equal in number to the poles on the stator, and slip rings provide a method of inserting resistance for starting and for varying speed.
Full voltage, or across-the-line, starting of three-phase machines is possible up to about HP, after which a reduced-voltage method is often necessary especially for motors that are started frequently, because of the noticeable voltage drop affecting lights, other motors, etc.
Single-phase motors are used mostly in the fractional HP ranges. They are not self-starting and can be grouped by their starting method. The most widely-used design—the split phase motor—uses two stator windings to achieve a pair of unbalanced winding currents, with the auxiliary winding dropping out as the motor nears synchronous speed. A capacitor motor inserts a capacitor in the auxiliary winding which, in the case of a capacitor start machine, drops out as the motor nears running speed and, in the case of a two-value capacitor motor, switches to a second capacitor as it approaches running speed.
In the permanent split capacitor design, the auxiliary winding and capacitor remain energized at running speed. Finally, the shaded-pole motor uses unevenly divided poles with shading coils which cause a rotating field to move in the direction of the shaded pole i. Shaded-pole motors are among the cheapest of the single-phase machines. Synchronous single-phase motors are used in timing devices. For more information, check out our full article on the Types of AC Motors.
DC Motors are electro-mechanical devices powered by direct current to produce rotational motion. The motion provides rotational work to drive other rotating machines such as hoists at varying speeds.
Certain wiring arrangements can produce strong slow-speed torque, making them suitable as traction motors for locomotives, although these have largely been replaced by variable-frequency controlled motors. Likewise, golf cart motors are steadily being rejiggered from brushed designs to more advanced forms with electronic drives. Enclosures can range from simple open designs to explosion-proof, non-ventilated designs.
DC motors have many applications in toys and consumer goods and are used heavily by automakers. They find service on elevators, electric forklifts, and conveyors, where constant-torque loads are normal. DC motors are available as brushed and brushless permanent magnet designs, the latter requiring electronic drives and controllers for their operation. Traditional brushed DC motors are classified on the basis of the excitation used in the field winding with the three main distinctions being shunt, series, and compound.
Shunt motors have low starting torques, low overload capacity, minimal speed variation in response to load, and poor stability at zero load. Series motors have high starting torques, high overload capacity, significant speed variation in response to load, and good stability at zero load. Compound motors fall somewhere between the other two in performance characteristics, though they too remain stable at zero load.
Gearmotors are electro-mechanical devices powered by alternating or direct current to produce rotational motion.
The motion provides rotational work which is then stepped down through an integral gearhead to drive other rotating machines such as conveyors or packaging machines. Gearmotors are used where motors and speed reducers are required to produce high torque at slow speeds. By integrating the two components, gearmotors achieve efficiencies in size, eliminate external couplings, improve washdown resistance, etc.
Often, gearheads are interchangeable between manufacturers. Although uncommon for large motors, gearmotors are quite common in fractional HP sizes. They are available in various output-shaft styles with choices among motors that include AC and brushed- and brushless-DC varieties. Stepper Motors are electro-mechanical devices powered by alternating current to produce rotational motion and positioning.
Both rotary and linear actuators are used. Low-cost brushed DC motors are common, but are being superseded by brushless AC motors for high-performance applications.
Stepper motors use an internal rotor, electronically manipulated by external magnets. The rotor can be made with permanent magnets or a soft metal. As windings are energized, the rotor teeth align with the magnetic field. This allows them to move from point to point in fixed increments.
Before work begins on any new system, think carefully about the competing properties of the different motors.
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