DDSM210 BLDC Motor Tear Down

DDSM210 (Direct Drive Servo Motor) from Waveshare integrates an outer rotor brushless motor, encoder, and servo drive into a high-reliability permanent magnet synchronous motor. Cost is only $23.99 so I was interested to teardown the motor to ee how this price point was achieved.

There are 18 coils, 20 magnets and no gears. Linear Hall-effect sensors are placed ~45° apart around the inner ring; they read the magnetic encoder ring to produce the sine/cosine signals used for rotor position. Seems like 4096 ppr after interpolation.

Black electric motor with a connector cable, featuring a textured outer casing and a central mounting hub.

Close-up of a circular electric motor with copper coils and a black circuit board at the center.

Close-up of a circular printed circuit board featuring various electronic components and labels like LKS and 4606B.

Round metal component with rubber edge and two green labels, likely part of a mechanical device or tool.

Close-up of an electric motor's rotor showing copper windings and a central bearing.

Circuit board with four capacitors labeled 22 35V RVT and a connector, featuring a central circular cutout.

Schematic diagram of the LKS32MC03x vector sinusoidal control system, detailing power, digital, and analog domains.

DDSM210 Waveshare Direct Drive BLDC Hub Motor, Low Cost
Waveshare DDM210
Github waveshareteam ddsm_example

Qty	Part	Unit Price
1	LKS32MC037QM6Q8 microcontroller with 3P3N gate driver	$0.40
3	AO4606 dual N/P-CH MOSFET, 30V 6A, 8SOIC	$0.13
2	MT9101 linear Hall-effect sensors	$0.16
1	0.05ohm resistor	$0.03
1	78L05 linear 5V regulator	$0.04
4	22uF 35 V Electrolytic SMD Capacitor	$0.02