Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
| en:examples:motors:stepper [2009/03/26 16:16] – created raivo.sell | en:examples:motors:stepper [2010/02/04 12:30] (current) – removed mikk.leini | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ====== Stepper motor ====== | ||
| - | Stepper motors can very generally be divided into unipolar and bipolar steppers. | ||
| - | Unipolar stepper motors are characterized by their centre-tapped windings, which | ||
| - | divide two coils into four. Stepper motors have neither built-in brushes nor internal | ||
| - | electronics, | ||
| - | common commutation type is the open-loop mode: the motor driver energizes the | ||
| - | coils following a certain pattern, but uses no feedback. Steps can be missed in case of | ||
| - | motor shaft torque overload. Missed steps cause inaccurate positioning. Bipolar | ||
| - | stepper motors usually have four wires and two separate coils inside; they have many | ||
| - | features similar to those of unipolar steppers. Unipolar stepper motors can be run as | ||
| - | bipolar stepper motors, but not vice versa. | ||
| - | ===== Electrical connections ===== | ||
| - | |||
| - | Table of stepper motor windings. | ||
| - | |||
| - | {{: | ||
| - | |||
| - | Table of stepper motor drive signals from ATmega128 to the actuator board. | ||
| - | {{: | ||
| - | |||
| - | - Make sure all power is off. | ||
| - | - Connect the actuator board and main board with a 26-pin cable. | ||
| - | - Connect the stepper to the actuator board, as shown in Figure 3. | ||
| - | Note: The unipolar motor cable must be properly connected (wires a and b, | ||
| - | according to figure 1, connects to pin 1 and 2 on connector UNI1 or UNI2). | ||
| - | - Connect the JTAG converter with the ATmega128 main board and the PC. | ||
| - | - Finally, connect the power to the main and actuator boards. | ||
| - | |||
| - | {{: | ||
