Practical applications of stepper motor in hobby electronics

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The motor is activated using electromagnetic coils, which magnetise cogs on the gear wheel. To move the cog, the coil currently holding it is turned off and a different one is turned on. The magnetic …

The motor is activated using electromagnetic coils, which magnetise cogs on the gear wheel. To move the cog, the coil currently holding it is turned off and a different one is turned on. The magnetic pull the stepper-motor exerts on the cog teeth thus causes the wheel to change position. One such change is referred to as a “step”.

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  • 1. Practical Applications of Stepper- Motor in Hobby Electronics http://proto-pic.co.uk
  • 2. Practical Applications of Stepper- Motor in Hobby ElectronicsWhat is a Stepper-motor Simply speaking, a stepper-motor is a brushless motor running on a DCcurrent, which is able to split one full rotation of a gear cog into a number ofequal steps. These steps do not have to be sequential (i.e. in the samedirection, rather than moving first forward and then backward) – though in thesimplest configuration of the motor they often are. http://proto-pic.co.uk
  • 3. Practical Applications of Stepper- Motor in Hobby ElectronicsHow It Works The motor is activated using electromagnetic coils, which magnetise cogson the gear wheel. To move the cog, the coil currently holding it is turned offand a different one is turned on. The magnetic pull the stepper-motor exertson the cog teeth thus causes the wheel to change position. One such changeis referred to as a “step”. http://proto-pic.co.uk
  • 4. Practical Applications of Stepper- Motor in Hobby ElectronicsThe motor is used to make adjustments in positioning devices, for example inthe laser head in a DVD or CD player. The clicking sound you sometimeshear in older DVD and CD players is an old stepper-motor losing its grip. http://proto-pic.co.uk
  • 5. Practical Applications of Stepper- Motor in Hobby ElectronicsPros and Cons of using Stepper-motor The motor suffers from a lack of torque at higher speeds. The faster thewheel turns, the more the cog is likely to slip. So applications requiring themotor to turn at high speeds may be better served using a servo motorinstead. The resonating effect also exhibited by the stepper-motor at highspeeds may have an adverse effect on device performance. http://proto-pic.co.uk
  • 6. Practical Applications of Stepper- Motor in Hobby Electronics The plus points of the stepper-motor are many. For example, its relativelylow cost and high reliability at low speeds make it ideal for a wide range ofamateur projects. While its simplicity of design means it can operate in evenquite difficult conditions, where a more delicately calibrated motor may havetrouble functioning properly. http://proto-pic.co.uk
  • 7. Practical Applications of Stepper- Motor in Hobby Electronics The motor does suffer from limitations of size, in that it gets too bigwhere a large degree of steps are required (and hence a large number of cogteeth). http://proto-pic.co.uk