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Topmost Applications Of The Stepper Motors

Nov 16th 2015 at 1:51 AM

Stepper motors are the regulated drives that are controlled digitally. They are used to convert the electrical pulses into the mechanical movements. They are highly accepted in the industry due to the large number of benefits they provide. Competitive prices are provided to their users with few control requirements and long life.

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The unipolar stepper motor driver is smoothly controlled by the open loop system. With this type of control, there is no need of expensive sensing. You have to keep track of the input step pulses to know your position.

Broadly there are three types of stepper motors including hybrid, permanent magnet and the variable reluctance. Variable reluctance motors are in the market for many years. It has an easy to understand structure, including a unique wound stator and soft iron rotor with many teeth. Direct current is passed through the stator windings to magnetize the poles. The wheels are attracted by the energized stator poles, which starts the rotation.

Permanent magnet motor is also known as canstock or tin can. It is low resolution and cost efficient type of motor. The step angle varies from 7.5" to 15". Permanent motors are included in the motor structure. They have much improved torque characteristics as compared to other motor steppers.

All about the hybrid motors

Hybrid motors is a quite expensive option. However, it offers great performance with respect to the torque, step resolution, and speed. The range of step angles is 3.6" to 0.9". It has a rotor with many teeth and a concentric magnet. Users prefer permanent and hybrid motors.

It is important to make the right choice, while selecting these motors. Many a times, designers are not sure which type of motor will ideally suit the application. In such cases, they can start fitting the PM motor, as it is a cheaper option. If this motor does not serve the purpose, they can switch over to a good hybrid motor.

These motors have a direct rive. Other types of motors require gears to achieve that requested speed. This is not the case with stepper motor. They provide maximum torque in the lower speed range, which helps them to achieve acceptable concentrity. This reduces the overall cost of the system and enhances the life span of the motor. The fact is that stepper motors do not cause any kind of damage to the machine. They do not face problems like slip of overload couplings.

Other benefits of fitting stepper motors to the machinery

As they have small step angles, they are available with least translet response. They are capable for fulfilling the positioning tasks even in the absence of angle sensors. The nanotech final technology fitted in these motors can enhance the resolution and precision without any extra costing. The nanotech motors are available with highly advanced encoders that detect blockages and step loss conveniently.

Moreover, they guarantee to offer great rigidity and stiffness. Due to this property the machine does not require any external braking mechanism.

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