BLDC MotorTopband BL8042 inner-rotor BLDC · 102 mm

BL8042

Name: BL8042
Brand: Topband Motor

416.6 W, 27.2 V 102 mm BLDC motor from Topband Motor: 1.02 N·m rated at 3900 rpm.

Manufacturer datasheet: Topband Motor · BL8042 ↗ (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:Automotive Home Appliances

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How this motor is made

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

102 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: 417 W
Rated torque: 1.02 N·m
Rated speed: 3,900 rpm
Rated efficiency: 87.5 %

Performance curves

Right axis:

SpeedEfficiency (right axis)

Calculated with the linear DC-motor model (constant 27.2 V supply, ignoring resistance rise with temperature).

Full specifications

General

Motor type: BLDC Motor
Series: Topband BL8042 inner-rotor BLDC
Frame / flange: 102 mm

Rated Values

Rated voltage: 27.2 V
Rated power: 417 W
Rated torque: 1.02 N·m
Rated speed: 3,900 rpm
Rated current: 17.5 A

Performance

Stall torque: 14.4 N·m
No-load speed: 4,197 rpm
Rated efficiency: 87.5 %
Peak efficiency: 87.7 %

Electrical

Torque constant Kt: 0.0616 N·m/A
Back-EMF constant Ke: 6.45 V/krpm
Resistance: 0.116 Ω
Inductance: 0.174 mH
No-load current: 0.95 A
Stall current: 235 A
Electrical time constant: 1.5 ms
Mechanical time constant: 7.78 ms

Mechanical

Rotor inertia: 2,548 g·cm²
Body length: 155 mm
Shaft diameter: 12 mm
Weight: 3.42 kg
Power density: 122 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
BLDA0401A1	Motion Control	BLDC	12–55 V DC	18 A
PSDB-4031A1	Motion Control	BLDC	12–55 V DC	18 A
ZM-BL48Z18S	Zeming	BLDC	24–48 V DC	18 A	Hall sensors
NU-BL5020-01	Nuelectronics	BLDC	18–50 V DC	20 A / 25 A	Hall sensors, Sensorless, Open loop, Closed loop
NU-BL5020-02	Nuelectronics	BLDC, Servo	18–50 V DC	20 A	Hall sensors, Incremental encoder
BD20L□□1□	Stonker Motor	BLDC	24–48 V DC	20 A	Hall sensors