Waterproof 7*20mm DC Brush Micro Coreless Motor for Intelligent Robots

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Waterproof 7*20mm DC Brush Micro Coreless Motor for Intelligent Robots

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Product Description

🚀 7B Series φ7mm x L20 Precious Metal Brushes Coreless Motor

📊 Technical Parameters

Values at nominal voltage	Unit	7B1NA-013021	7B2NA-024091
Rated voltage	V	3.0	3.7
No load speed	rpm	31730	42870
No load current	mA	28	104
Max. efficiency	%	78.61%	72.72%
Speed at max efficiency	rpm	28499	37351
Current at max efficiency	mA	249	701
Torque at max efficiency	g.cm	2.48	3.99
Stall current	A	2.2	4.7
Stall torque	g.cm	24.38	31

📈 Motor Characteristics & Performance

🌡️ Thermal Parameters

Ambient temperature: -20~+65 ºC
Max. winding temperature: 85 ºC

⚙️ Mechanical Parameters

Max. No-load speed: 60000 rpm
Max. axial load (dynamic): 0.15 N

⚖️ Physical Specifications

Weight: 3.2 g
Number of pole pairs: 1
Commutator segments: 3~5

Notes: 1g=0.035oz | 1inch=25.4mm | 1g.cm=0.098mN.m | Customization available for rotation direction, wire specifications, and performance parameters.

🏢 Production & Quality Control

💡 Product Applications

Frequently Asked Questions

What are the main advantages of the 7B Series coreless motor?

The 7B series features a precious metal brush design and coreless structure, offering high efficiency (up to 78.61%), low inertia for rapid acceleration, and a compact lightweight design (3.2g) ideal for precision applications.

Can the motor specifications be customized?

Yes, we can customize the rotation direction, wire specifications, and various performance parameters. Additionally, dimensions marked with "*" in technical drawings can be adjusted to meet specific requirements.

What is the typical operating temperature range for these motors?

These motors are designed to operate in ambient temperatures ranging from -20ºC to +65ºC, with a maximum permissible winding temperature of 85ºC.

Can this motor be used as a vibration motor?

Absolutely. The motor can be mounted with various shapes and sizes of eccentric weights (made of iron, brass, or ferro-alloy) to function as a high-performance vibration motor.

What are the typical applications for the 7mm coreless motor?

They are widely used in intelligent robots, medical devices, handheld equipment, and precision instruments where small size and high reliability are critical.

What is the stall torque of the 3.7V model?

The 7B2NA-024091 model (3.7V nominal) provides a stall torque of 31 g.cm and a stall current of 4.7A.