The vast majority of air-conditioned clothing products on the market use miniature brushless DC motors, mainly for the following reasons:
- Battery life: Brushless DC motors offer high efficiency and longer battery life, which is critical for air-conditioned clothing that requires a small portable battery pack.
- Noise control: Brushless DC motors generate lower friction and electromagnetic noise during operation, and noise control directly affects wearing comfort.
- Size and weight: Brushless DC motors can be made very thin and light, making them suitable for integration into garments.
- Durability and reliability: Brushless DC motors have no carbon brush wear and typically last thousands of hours. Air-conditioned clothing requires high durability due to repeated wearing, folding, and washing.
- Easy speed control: Brushless DC motors allow simple speed adjustment to match different temperature perception needs.
Key features of the 20M series motor
- Structural protection: Housed design, basic dust resistance (no waterproof rating).
- Performance improvement: Higher output than the 13H, especially capable of higher torque (increased from 3 mNm to 5 mNm).
- Drive advantage: Supports battery drive with an expanded voltage range of 5 V to 18 V.
- Internal construction: Uses sleeve bearings (oil-impregnated bearings), with built-in driver IC.
Specification comparison between 13H and 20M
| Parameter | 13H | 20M |
|---|---|---|
| Continuous rated power | 2 [W] @ DC 12 [V] | 4 [W] @ DC 12 [V] |
| Rated torque | 3 [mNm] | 5 [mNm] |
| Rated speed | 6000 ± 10% [rpm] | 7700 ± 10% [rpm] |
| Rated current | 0.35 [A] Max | 0.7 [A] Max |
| Dimensions | Φ24.2 × L19.1 mm | Φ24.4 × L13.3 mm |
| Number of slots/poles | 12 poles, 9 slots | 12 poles, 9 slots |
| Construction features | Sleeve bearing, built-in driver IC | Ball bearing, built-in driver IC |
