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Document Brief

Stepper Motors...

Introduction...

This catalog is intended as a guide for the user to help select or specify a DC stepper motor. The size, weight and performance characteristics of the motors shown in the data sheets are examples of typical applications. Aeroflex can provide custom solutions if desired. This customization can include size variations, step angles, winding characteristics, performance characteristics and physical mounting requirements....

Stepper Motor Description...

Stepper motors provide precise motion without the need for position feedback or commutation. Essentially the motor runs open loop. This type of motor has many advantages and disadvantages, which are discussed in the Application Considerations section of this document. The designer must weigh the pros and cons of the stepper motor in order to properly evaluate its use and implementation. Stepper motors come in two basic configurations as used in most applications permanent magnet and hybrid. Permanent magnet motors are configured just as the name implies incorporating the use of permanent magnets. The hybrid design is a combination of permanent magnet and variable reluctance motor technologies. The hybrid motor usually has a rotor with teeth. A stepper motor converts electrical pulses into incremental mechanical motion. Upon the application of electrical pulses in the proper sequence and polarity, the motor will rotate in the commanded direction. One energizing pulse results in one step at the output shaft of the motor. The frequency of the output steps is directly related to the frequency of the input electrical pulses....

Performance Considerations...

When considering a stepper motor for an application there are several parameters that require evaluation. In many cases the designer is limited due to existing drive electronics and therefore must go down a limited path. Parameters to consider when evaluating stepper motors are as follows ...

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Output step angle Pulse rate required Running Torque Powered holding torque Unpowered holding torque Size and power constraints Load, friction and inertia Redundancy Drive electronics...

With respect to drive electronics, many variables exist. The designer must be aware of different drive techniques, such as unipolar and bipolar as well as how many phases are energized simultaneously....

Application Considerations...

As with all designs, it is important to select the right components in order to be successful. Here are some trade-off points to...

Document Keywords

Stepper Motor Description ams motion datasheets stepper info document

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About Aeroflex, Inc.

Our customers have complex, high - performance requirements and are predominantly found in the aerospace, defense, wireless mobile, broadband communications and advanced manufacturing markets. Aeroflex...

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