BLDC MotorTopband BL4815 inner-rotor BLDC · Ø52.5 mm

BL4815

Name: BL4815
Brand: Topband Motor

236.8 W, 18 V Ø52.5 mm BLDC motor from Topband Motor: 0.135 N·m rated at 16751 rpm.

Manufacturer datasheet: Topband Motor · BL4815 ↗ (checked 2026-10-18)Maker profile & contacts →

Figures are copied from the maker’s published datasheet; curves are calculated from them. Confirm with the manufacturer before ordering. Not stated on the datasheet, estimated from it: torque constant (fitted to the rated point), resistance (fitted to the rated point), inductance, rotor inertia, insulation class, IP rating.

Applications:Power Tools Home Appliances

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How this motor is made

Full manufacturing overview: 57 mm Inner-rotor BLDC Motor →

Ø52.5 mm frame; built with the same process as the 57 mm inner-rotor reference series.

Assembly steps: 11
Equipment types: 14
BOM lines: 13
PRD suppliers: 88

1. Lamination stamping & interlocking
2. Stator insulation
3. Winding
4. Terminal connection
5. Stator in-process test
6. Impregnation & curing
7. Rotor assembly
8. Magnetizing
9. Rotor balancing
10. Final assembly
11. End-of-line test

Export certification: Low-voltage motor without electronics

Rated power: 237 W
Rated torque: 0.135 N·m
Rated speed: 16,751 rpm
Rated efficiency: 85.7 %

Performance curves

Right axis:

SpeedEfficiency (right axis)

Calculated with the linear DC-motor model (constant 18 V supply, ignoring resistance rise with temperature).

Full specifications

General

Motor type: BLDC Motor
Series: Topband BL4815 inner-rotor BLDC
Frame / flange: Ø52.5 mm

Rated Values

Rated voltage: 18 V
Rated power: 237 W
Rated torque: 0.135 N·m
Rated speed: 16,751 rpm
Rated current: 15.4 A

Performance

Stall torque: 2.98 N·m
No-load speed: 17,546 rpm
Rated efficiency: 85.7 %
Peak efficiency: 86.5 %

Electrical

Torque constant Kt: 0.00975 N·m/A
Back-EMF constant Ke: 1.02 V/krpm
Resistance: 0.0586 Ω
Inductance: 0.0879 mH
No-load current: 1.51 A
Stall current: 307 A
Electrical time constant: 1.5 ms
Mechanical time constant: 6.91 ms

Mechanical

Rotor inertia: 112 g·cm²
Body length: 101 mm
Shaft diameter: 6 mm
Weight: 0.256 kg
Power density: 925 W/kg
Insulation class: B
Protection: IP40

Compatible drivers

All drivers →

Drivers whose supply voltage covers this motor and whose continuous current is at least its rated current; drivers from the same maker first. Confirm Hall/encoder type and settings with the maker.

Model	Maker	Motor type	Supply	Cont. / peak current	Feedback
ZM-BL4815F	Zeming	BLDC	18–50 V DC	15 A	Hall sensors, Sensorless
DBL-15RS	Mayi Motor	BLDC	18–60 V DC	15 A	Hall sensors
DBL4815RS	Mayi Motor	BLDC	18–55.2 V DC	15 A / 50 A
BD15L□□2□	Stonker Motor	BLDC	12–60 V DC	15 A	Sensorless
ADM-15D80-CALT	TechServo	BLDC, Servo, DC	14–80 V DC	15 A / 30 A	Incremental encoder, Absolute encoder, Hall sensors
ADM-15D80-EALT	TechServo	BLDC, Servo, DC	14–80 V DC	15 A / 30 A	Incremental encoder, Absolute encoder, Hall sensors