Types Of Motors And Their Applications In Industries Pdf
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- Different types of motors and their use
- Selecting Motors for Industrial Applications
- Different Types of Electric Motors
Different types of motors and their use
Efficient use of motors is always important, but there are many other things to consider when specifying an electric motor. Mechanical and environmental considerations are on the list, as is the application and operation. All of these factors are important, but the application is where the selection process should start.
The application defines the motor load, speed, acceleration, deceleration and duty cycle of the motor. This all feeds into the horsepower and torque requirements. Control of motor speed and position also determines the type motor used, and defines whether the motor load is constant or variable horsepower and torque. Applications drive the type of motor load, and there are four main types in industrial automation:. Gear pumps, cranes and conveyors are examples of variable horsepower and constant torque applications.
Constant speed AC and DC motors work well in these applications where the horsepower requirements may vary, but the load remains constant.
A web unwind or rewind machine is an example of a variable torque and constant horsepower application because the load increases with the diameter of the roll and vice versa. DC motors and servo motors work well here, and AC motors with closed loop drives are another option. Consider regenerative power in this case to increase efficiency.
When speed increases, so does the motor load. Variable frequency drives VFDs are often used in these situations. Motion control applications with linear motion slides and actuators often require accurate positional control, and some presses and tension control systems use torque control. Feedback is usually required, and servo and stepper motors are often a good choice. You only need to choose between two classifications of motors, AC and DC, but there are over three dozen motor types used in industrial applications.
The selection of motors and drives listed and pictured about should cover most industrial automation motor applications. Some applications need a gearbox to increase torque. Many applications only require the motor to run at constant speed with no need for acceleration and deceleration ramps.
Simple on-off control using branch circuit protection fusing, contactor and overloads are all that is needed to turn the motor on an off.
Motor starters, manual motor control or soft starter are also often used. Common AC and DC motors are suitable in these applications. Both are simple and efficient designs and require minimal maintenance. The ability to control acceleration and deceleration may also help handle product better, such as on a conveyor, and reduce mechanical issues by being gentler on the motor and drivetrain of the system. Coarse positioning of product can also be accomplished with variable speed control using slowdown and stop photoeyes.
DC and AC motors work well in most variable speed applications. DC drives have been around for over years, and variable speed drives for AC motors have been in use for about 30 years. DC motors are common used on conveyors and other fractional horsepower applications because they provide full torque at low speeds, with torque remaining constant throughout much of the speed range.
Many DC motors use brushes which require maintenance, so keep that in mind or spend a little more money for brushless DC motors, or switch to AC motors and drives. If it is a fan or pump application, this is often the best option, especially if motor loads are over 1 HP. Beyond simple constant speed and variable speed applications is motion control.
Executing precise position control, and implementing motion profiles with closed loop control, often requires a servo or stepper system. Dispensing applications and moving a linear slide or actuator are examples. At the low speed end of the precision scale, a stepper system, open or closed loop, is a good choice, especially since the stepper has full torque at zero speed. As speeds and accuracy requirements increase, a servo system is a good choice because it handles dynamic loads and complex motion profiles better than a stepper.
There is a wide choice of AC, DC, stepper and servo motors available for your applications. Identify whether it is a constant speed, variable speed or position control application—and then size and select appropriately using online guidance from AutomationDirect.
For more information, please see the article How to select a motor for an industrial application in the February issue of Control Engineering, authored by Bryan Sisler, a Product Manager at AutomationDirect.
To read more articles about motors, click here. Selecting Motors for Industrial Applications February 20, How to Select a Motor The application defines the motor load, speed, acceleration, deceleration and duty cycle of the motor.
Applications Drive Motor Loads Applications drive the type of motor load, and there are four main types in industrial automation: variable horsepower and constant torque variable torque and constant horsepower variable horsepower and variable torque positional control or torque control Gear pumps, cranes and conveyors are examples of variable horsepower and constant torque applications.
Pick a Motor You only need to choose between two classifications of motors, AC and DC, but there are over three dozen motor types used in industrial applications.
Constant Speed Applications Many applications only require the motor to run at constant speed with no need for acceleration and deceleration ramps. Position Control Applications Beyond simple constant speed and variable speed applications is motion control.
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Selecting Motors for Industrial Applications
Premium Membership. Learn from experienced power engineers. Almost all modern industrial and commercial undertakings employ electric drive in preference to mechanical drive because it possesses the following advantages :. However, the above two disadvantages can be overcome by installing diesel-driven DC generators and turbine-driven 3-phase alternators which can be used either in the absence of or on the failure of normal electric supply. Since it has high starting torque and variable speed , it is used for heavy duty applications such as electric locomotives, steel rolling mills, hoists, lifts and cranes. It has high starting torque, large overload capacity and a nearly constant speed. It has high starting torque and large overload capacity.
Different Types of Electric Motors
There are many aspects to consider when selecting an industrial motor, such as application, operational, mechanical, and environmental issues. Knowing which one to use depends on the industrial application and if there are any special needs required. A constant or variable torque and horsepower will be required for the industrial motor depending on the type of load the motor is driving. Requirements for controlling motor speed and position also need to be considered. Variable horsepower and constant torque applications include conveyors, cranes, and gear-type pumps.
Efficient use of motors is always important, but there are many other things to consider when specifying an electric motor. Mechanical and environmental considerations are on the list, as is the application and operation. All of these factors are important, but the application is where the selection process should start. The application defines the motor load, speed, acceleration, deceleration and duty cycle of the motor.
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:. 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. 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.
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