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Access Control Turnstile Motors: Brushed vs. Brushless vs. Servo Motors
Created on 03.13
In access control turnstile systems, the choice of motor type significantly impacts performance, lifespan, and maintenance costs. Below is a detailed comparison of three motor types: Brushed DC Motor (BDC), Brushless DC Motor (BLDC), and Servo Motor.
1. Brushed DC Motor (BDC)
Working Principle
- Uses brushes and a commutator to switch current direction, driving rotor rotation.
Key Features
- Advantages
- Low cost
, simple structure, easy control (runs directly on DC power).
(~1,000–3,000 hours) due to brush/commutator wear.
(60–75%) – energy loss from friction and heat.
– requires periodic brush replacement and cleaning.
due to mechanical contact.
Typical Applications
- Budget turnstiles with low durability requirements (gradually being replaced by BLDC).
2. Brushless DC Motor (BLDC)
Working Principle
- Uses electronic commutation (Hall sensors or FOC algorithms) instead of brushes.
Key Features
- Advantages
- Long lifespan
(10,000+ hours) – no mechanical wear.
(85–95%) – minimal energy loss.
– only requires occasional bearing lubrication.
– no brush friction noise.
– supports speed adjustment and smooth start/stop (requires a driver).
- Disadvantages
- Higher cost
– needs a dedicated driver (e.g., 3-phase inverter).
– requires sensors or algorithms for commutation.
Typical Applications
- Modern turnstiles (e.g., subway gates, office barriers) where performance and cost are balanced.
3. Servo Motor
Working Principle
- Closed-loop system with encoder feedback for real-time position/speed/torque adjustment.
Key Features
- Advantages
- Ultra-high precision
(error < ±0.1°).
– ideal for high-speed, frequent start-stop operations.
– instant torque up to 3x rated value.
- Disadvantages
- Highest cost
– requires motor + driver + encoder.
– needs PID parameter adjustments.
Typical Applications
- High-end turnstiles (airports, customs) or scenarios requiring rapid, precise movement.
Comparison Summary
Parameter | Brushed DC Motor | Brushless DC Motor | Servo Motor |
Cost | Lowest | Medium | Highest |
Lifespan | Short (~1k–3k hrs) | Long (10k+ hrs) | Long (10k+ hrs) |
Efficiency | 60–75% | 85–95% | 80–90% |
Maintenance | High (brush wear) | Low (bearing only) | Very low |
Control Accuracy | Low (open-loop) | Medium (can be closed) | Extremely high (closed-loop) |
Best For | Low-cost, legacy systems | Standard turnstiles | High-speed, high-precision gates |
Selection Guide
- Budget-friendly, low usage
: Brushed DC (phasing out).
- Standard turnstiles
: BLDC (best cost-performance balance).
- High-speed, high-precision
: Servo (e.g., 60+ passages/minute).
For real-world projects, factors like turnstile type (tripod, flap, etc.), speed requirements, and system integration must also be considered.
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