Unipolar Stepper Motors and Motor Control

Unipolar stepper motors are commonly used in smaller applications, with specific coil wire configurations that allow them to be driven only as unipolar motors. This guide outlines the wiring configurations, coil phases, and motor control steps for efficient operation of these motors.

• Unipolar Motors
• Stepper Motors
• Motor Control
• Coil Phases
• Wiring Configurations

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1. Blue Pink: 45 Ohms Blue Yellow: 45 Ohms Blue Orange: 45 Ohms Blue Red: 23 Ohms This style is common in smaller unipolar motors. All of the common coil wires are tied together internally and brought out as a 5th wire. This motor can only be driven as a unipolar motor. Pink Yellow: 45 Ohms Pink Orange: 45 Ohms Pink Red: 23 Ohms Yellow Orange: 45 Ohms Yellow Red: 23 Ohms https://learn.adafruit.com/all- about-stepper-motors/types-of- steppers 23 Orange Red: 23 Ohms Orange (4) 23 23 23 Pink (2) 46 RED RED Blue (1) Yellow (3) Taking path of least resistance, one sees that 46 Ohms between any of the 4 wires e.g. red and blue arrows show paths

2. 1. Coil 1 and 2 2. Coil 2 3. Coil 2 and 3 4. Coil 3 5. Coil 3 and 4 6. Coil 4 7. Coil 4 and 1 8. Coil 1 Arduino 12 11 10 9 Motor BLU PNK YLW ORG Board IN1 BLK IN2 WHT IN3 GRY IN4 PUR BLK WHT GRY PUR IN1 IN2 IN3 IN4

3. STEP 1 4 phase (because 4 coils) STEP 4 GND Pink Coil 2 Pink Coil 2 +5 Yellow coil: ON Pink coil: ON Orange coil: ON Orange Coil 1 +5 Orange Coil 1 GND Yellow Coil 3 GND Blue Coil 4 +5 Yellow Coil 3 +5 Blue Coil 4 +5 STEP 2 STEP 5 Pink Coil 2 +5 Pink Coil 2 GND Orange coil: ON Yellow coil: ON Pink coil: ON Orange Coil 1 GND Orange Coil 1 +5 Yellow Coil 3 GND Blue Coil 4 +5 Yellow Coil 3 +5 Blue Coil 4 +5 STEP 6 STEP 3 Pink Coil 2 Pink Coil 2 +5 GND Pink coil: ON Blue coil: ON Yellow coil: ON Orange Coil 1 Orange Coil 1 +5 +5 Yellow Coil 3 +5 Blue Coil 4 GND Yellow Coil 3 GND Blue Coil 4 +5

4. STEP 6 Pink Coil 2 GND Pink coil: ON Blue coil: ON Orange Coil 1 +5 Yellow Coil 3 +5 Blue Coil 4 GND STEP 7 Pink Coil 2 +5 Blue coil: ON Orange Coil 1 +5 Yellow Coil 3 +5 Blue Coil 4 GND STEP 8 Pink Coil 2 +5 Blue coil: ON Orange coil: ON Orange Coil 1 GND Yellow Coil 3 +5 Blue Coil 4 GND

6. https://components101.com/motors/28byj-48-stepper-motor D4 IN4 D2 IN3 D1 IN2 D0 IN1 0111 (7) 1001 (9) 1101 (13) 1100 (12) 1110 (14) 0011 (3) 1011 (11) 0110 (6) 0111 0011 1011 1001 1101 1100 1110 0110