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电子发烧友网>电子资料下载>嵌入式开发>MSP430 Stepper Motor Controller电机控制:步进电机

MSP430 Stepper Motor Controller电机控制:步进电机

2017-10-12 | rar | 0.30 MB | 次下载 | 免费

资料介绍

  Stepper motors operate by sequentially energizing coils located in the stator. Depending upon the stepper

  motor’s type; variable reluctance, permanent magnet, or hybrid, the rotor contains a toothed soft-iron core,

  permanent magnets, or both. What sets a stepper motor apart from other motor types is the ability to step

  (or turn) its rotor in small, precise increments and lock it in place

  Three configurations are typically found for wiring a stepper motor’s windings; variable reluctance,

  unipolar, and bipolar. Each configuration requires different drive circuitry and its associated method of

  control. This application report focuses on controlling stepper motors with bipolar windings. Bipolar stepper

  motors are driven using an H-bridge circuit since current flow is bi-directional through the windings.

  Based on its internal winding resistance, stepper motors are rated for maximum current at a particular

  voltage. Maximum torque is developed when maximum current is flowing through the windings. Operating

  at this voltage, however, is inefficient due to the ramp-up time it takes for current flow to overcome the

  winding‘s inherent inductance. Applying a voltage much higher than it’s rated for to a stepper motor

  reduces this ramp-up time. To do this without overheating and destroying the motor, however, the winding

  current must still be limited to its maximum rated value. This is done by using a chopper circuit which

  controls the ratio of winding current on time to off time once the maximum current level is reached.

MSP430 Stepper Motor Controller电机控制:步进电机

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