Testing washing machine brush motors with a professional test rig
🚫 NOTE: when searching for washing machine carbon brushes, you will always need your full model number and brand if you cannot find what you're looking for please use the Contact Us page
🚫 NOTE: when searching for new or recycled washing machine motors, you will always need your full model number and brand if you cannot find what you're looking for please use the Contact Us page
How to go about diagnosing any problems when your washing machine motor
Safety First 🔒
Most motors have a thermal cut-out to prevent fires if they overheat. Using a multimeter, check the windings for continuity and ensure there's a path from the terminals to the brushes.
Inspecting Armature Damage 🔍
- Visual Inspection: Look for damage like scoring, discoloration, or uneven wear on the armature. These signs can indicate problems with the brushes or the motor's alignment.
- Testing Continuity: A multimeter can verify the armature windings' continuity. The ohms reading will depend on the motor's size.
Inspecting Carbon Brushes 💡
- Wear and Tear: Carbon brushes wear down from friction. They should have at least a centimeter of length. If not, consider replacing them.
- Surface Contact: The brushes must contact the commutator well. Uneven wear or chipping can impair performance.
- Spring Tension: Brushes are spring-loaded. Check for sufficient tension and ensure there's no restriction in the holders that could cause overheating and damage.
How the Tachometer Works 🎚️
- Speed Sensing: A tachometer controls and senses the motor's speed, often using a small generator or magnetic sensor.
- Functionality: It generates a voltage or pulse as the motor spins, with a frequency that's proportional to the motor's speed.
- Feedback System: This feedback lets the washing machine's controller adjust the motor speed for different cycles.
Key Takeaways 🗝️
- Regular Checks: Maintain the armature and carbon brushes to prevent issues and extend the motor's lifespan.
- Understand Symptoms: Knowing signs of wear and damage can help diagnose problems early.
- Importance of the Tachometer: It's crucial for regulating the machine's speeds, ensuring efficient wash, spin, and rinse cycles.
Remember, knowing your way around these components is not just about maintenance – it's about making smart choices for repairs and replacements. A well-maintained motor ensures a reliable washing machine, which is great for both the appliance and the environment. Keep this knowledge handy, and you'll be ready to tackle the intricacies of washing machine brush motors.
