CHIHAI BLDC3525 Brushless Motor

Overview

The CHIHAI MOTOR CHB-BLDC3525 brushless motor integrates a sensored Hall driver in a compact rotary housing. Choose the exact voltage/speed winding, shaft diameter and projection, and motor-only, open-controller or enclosed-controller package. This is a direct motor without a reduction gearbox.

Features

Integrated Hall-sensored commutation and driver.
Ball bearings at both ends and four-pole/six-slot magnetic construction.
White-wire direction input and yellow-wire FG speed feedback.
PWM or analog speed input, with a separate brake wiring mode.
9 mm or12 mm shaft references, with 2 mm or3 mm diameter according to available configuration.

Specifications

Brand / model	CHIHAI MOTOR / CHB-BLDC3525
Product	Direct brushless DC rotary motor with integrated sensored Hall driver; no reduction gearbox
Windings	12 V /3000 rpm, 24 V /6000 rpm, and separate12 V /6000 rpm configurations
Shaft choices	3 mm diameter: 9 mm or12 mm projection; 2 mm diameter: 9 mm projection only in retained options
Envelope	35 mm class; drawings specify36 mm diameter and 26 mm overall motor reference, 22 mm body reference
Mounting	4×M3 on25 mm pitch circle; screw penetration 2 mm maximum recommended, 2.5 mm absolute artwork limit
Construction	Ball bearings at both ends; four-pole/six-slot structure; integrated driver and coil protection board
Mass	Approximately66 g motor reference; controllers and shaft variants differ
Lead length	270–280 mm nominal references; dimension drawings 280±10 mm
Direction and feedback	White direction input; yellow FG open-collector speed output; blue speed/brake input
Installation	Do not reverse red/black supply polarity. Excess screw penetration can contact the stator and damage windings/driver.

Standard-Winding Performance

The following table applies to the 12 V /3000 rpm and 24 V /6000 rpm standard references. The12 V /6000 rpm option is a different winding; do not apply the 12 V /3000 rpm torque, current or output figures to it. No-load, rated and protection points are different operating conditions.

Parameter	12 V /3000 rpm reference	24 V /6000 rpm reference
No-load speed	3000±10%rpm	6000±10%rpm
No-load current	≤70 mA	≤130 mA
Rated torque	40gf.cm	90gf.cm
Rated speed	2300±10%rpm	4600±10%rpm
Rated current	≤280 mA	≤400 mA
Rated output	1.0 W	4.3 W
Stall-protection torque	≥170gf.cm	≥380gf.cm
Stall-protection current	≤0.85 A	≤1.5 A

Five-Wire Interface

Wrong wiring can damage the integrated driver. Red and black supply polarity must not be reversed. These five wires are control/supply connections for the integrated driver, not a set of three bare motor phases.

Wire	Function	Electrical reference
Black	GND	DC supply negative / signal ground
Red	VCC	Selected motor positive supply; 12 V interface reference ±10%; match24 V winding separately
White	CW/CCW	Direction input 0–5 V; HI≥2 V: CCW; LO≤0.2 V: CW; open versus grounded selects direction
Yellow	FG	Open-collector output, 9 pulses per motor revolution; maximum5 mA sink
Blue	SPEED / BRAKE	0–5 V PWM or1.2–3.3 V analog speed reference; brake-mode wiring disables speed adjustment

FG high level is at least4 V with a 5 V/10kΩ pull-up; low level0–0.6 V. Use the 9-pulse-per-revolution output for speed measurement and respect the 5 mA output-current limit. The blue input reference spans0–5 V; analog speed regulation is specified over 1.2–3.3 V. Do not apply motor supply voltage to logic inputs.

Controller Modes

The controller illustrations show speed-adjustment wiring and brake wiring as separate modes. Brake wiring has no speed-adjustment function. Controller-family illustrations cover BLDC3525/3650/4260 and do not make these different motors interchangeable. The controller input reference is 6–30 V DC; never connect220 V AC directly. Match the controller, selected winding and control mode before connection.

Mechanical Dimensions and Mounting

Configuration	Shaft projection	Motor overall	Front cap	Body reference	Diameter	Front boss diameter
3 mm shaft /12 mm projection	12±0.5 mm	26±0.5 mm	2.8±0.1 mm	22±0.2 mm	36±0.5 mm	9.2 mm
3 mm shaft /9 mm projection	9±0.5 mm	26±0.5 mm	3±0.1 mm	22±0.1 mm	36±0.5 mm	9 mm,+0.1/0
2 mm shaft /9 mm projection	9±0.5 mm	26±0.5 mm	2.8±0.1 mm	22±0.2 mm	36±0.2 mm	9.2 mm

Dimensions are in mm. All drawings show fourM3 mounting holes on a 25 mm pitch circle, R1 edge reference and 280±10 mm lead length. Limit screw penetration to 2 mm for conservative installation; the coil-protection artwork allows only 2.0–2.5 mm and warns that longer screws can reach the stator/windings. Verify the actual motor and fastener stack before tightening.

Applications

Compact robotics, mechanical equipment, motorized curtains and doors, rotary automation and gimbal-like mechanisms where the selected speed, torque, shaft and controller are suitable. A robot, chassis, gearbox or complete positioning system is not included.

What's Included

Motor Only: one selected CHB-BLDC3525 motor with its five-wire lead and integrated driver.
Open Controller package: one motor and one pictured open control board.
Enclosed Controller package: one motor and one pictured enclosed speed controller.

External power supply, mechanical equipment and feedback processor are not included. The integrated motor driver is present even in the motor-only option; the optional boards provide external control functions.

FAQ

Does the motor-only option need a separate commutation driver?

The motor contains its sensored driver. Connect the selected DC supply and control inputs correctly; an optional external control board is a separate package choice.