Teaching Preventive Maintenance for Electric Motors to Neurodiverse Students
By Craig Miles, PGCE.
Why Preventive Maintenance Matters
Preventive maintenance keeps electric motors working reliably and helps them last longer. Even reliable AC induction motors need planned inspections.
Teaching tip:
- Use real-world examples: show students a motor in a workshop or via a video.
- Highlight why maintenance matters for safety, production, and cost.
- Keep explanations short and structured, with a clear start, middle, and end.
Purpose of Regular Inspections
Regular inspections find small issues before they become major problems. In factories or ships, unplanned stoppages can lead to lost production, safety risks, and extra costs.
Teaching tip:
- Use visual aids, such as flowcharts or diagrams showing inspection schedules.
- Break explanations into small steps, rather than giving long blocks of text.
- Reinforce learning with hands-on examples or simulations.
Simple Maintenance Checks
For three-phase induction motors, simple checks help ensure a long service life:
- Service history: Review past repairs and notes
- Noise and vibration: Listen and feel for unusual operation
- Visual inspection: Look for damage, burning, or loose parts
- Winding tests: Measure insulation resistance and continuity
- Bearings: Check lubrication and smooth rotation
Teaching tip:
- Provide checklists or templates for students to follow.
- Allow students to practice each check step-by-step in a workshop or lab.
- Encourage repetition to reinforce memory and build confidence.
Inspection Frequency
The number and depth of inspections depend on:
- Motor criticality
- Operating environment (dust, moisture, heat)
- Usage frequency
Teaching tip:
- Create interactive schedules where students plan inspection routines.
- Use scenarios: ask students to decide how often a motor in a ship engine versus a factory conveyor should be checked.
- Give opportunities for discussion and problem-solving rather than just lecturing.
Key Areas: Stator and Bearings
Stator
- Contains copper wire windings
- Single-phase: one coil
- Three-phase: three coils
- Dust or moisture can reduce insulation resistance (below 1–2 MΩ can stop the motor)
Teaching tip:
- Use coloured models or diagrams to show the difference between single-phase and three-phase stators.
- Demonstrate how insulation testing works using safe lab equipment or simulations.
Bearings
- Subject to friction, wear, vibration, noise, or overheating
- Can be monitored using regular checks or IoT vibration sensors
Teaching tip:
- Allow students to observe worn and good bearings.
- Use hands-on vibration testing exercises where students identify problems.
Strategies for Autistic and ADHD Students
- Break learning into small steps – focus on one concept or task at a time.
- Use multi-sensory approaches – diagrams, hands-on models, videos, or simulations.
- Keep instructions clear and literal – avoid ambiguous language.
- Use visual schedules and checklists – helps with organisation and executive function.
- Allow repeated practice – repeat important tasks to build confidence.
- Connect to interests – relate tasks to areas students are passionate about, like machines or electronics.
- Provide safe space for questions – allow time to process and respond.
- Chunk assessment tasks – give small tasks with clear outcomes rather than large, abstract assignments.
Quick Summary for Teachers
- Preventive maintenance prevents breakdowns and keeps motors running longer.
- Focus on stator and bearings as main failure points.
- Use hands-on learning, visual aids, and structured tasks to support autistic and ADHD students.
- Break content into manageable steps, use checklists, and connect learning to student interests.