MotionBench electronicsSpecialist reuse

Brushless DC motor

Also called BLDC, EC motor, hub motor, spindle motor.

Three-phase windings and an electronic commutator that you must supply. Excellent life. Useless as a two-wire motor unless you keep the driver it came with.

If you are new to this category

These parts spin, push, or pump. A motor is a machine that turns electricity into turning. Some start turning as soon as you connect a battery. Others look identical and will not move until a small circuit tells them which coil to power next. The label, or the number of wires, is how you tell them apart.

Count the thick wires before you apply power. Two wires usually mean a brushed motor that can run from a battery. Three thick wires usually mean a brushless motor. Keep the board that came with a brushless motor.

Three thick wires

This is usually a brushless motor. Connecting a battery across two of the wires only makes it twitch, and holding it there heats the winding. Keep the small plug as well. Those thin wires are often the sensors that tell the board where the shaft is.

Lithium-ion cells. A punctured, crushed, overcharged, or reverse-charged cell vents and burns hot enough to ignite the bench. Swollen pouches are already failed.
Strong neodymium magnets. Hard-drive magnets slam together hard enough to blood-blister skin and shatter into sharp chips. They also wipe media and bother pacemakers.

Specification. The right-hand column is what is typical. The label on the part in your hand wins if they disagree.
What to look for	Usual figure
Phases	Three heavy wires
Sensors	Optional hall trio on a separate small plug, usually 5 V. Hard-drive spindles are sensorless.
Where	PC fans, drones, tool armatures, washer direct drive, scooter hubs, optical spindles

Volts are electrical pressure, amps are how much current is flowing, and ohms are how hard the part resists that flow. A higher voltage than the part was built for is how salvage parts die on the bench. If a cell in the table says “read the stamp”, that stamp is the whole specification.

What people actually use it for

Keep motor + controller as a pair
Drone and tool motors with an RC ESC if the KV is in range

Leave this one when

You have only the spindle from a hard drive and no ESC experience. The magnets inside are the better prize.

Buying a new one is the better idea when

A documented hobby BLDC with a KV rating, if you are designing rather than reusing a pair.

How to tell if this one still works

Resistance between phases should be low and matched. Open one phase means a dead stator. Do not DC-power two phases except as a momentary twitch.

Step-by-step on the bench: Power a salvaged BLDC without magic

Tools you will want: Meter, The original controller or an ESC.

Words on this page

Short meanings, so the rest of the entry is readable if you are not already doing this every weekend.

commutator: The copper drum and brushes inside a brushed motor. They switch the coils as the shaft turns. A healthy two-wire motor of this type runs from a battery.

Where people actually find it

7 notes, most useful first. “Leave it” means the part is in that machine and you should not take it: it is dangerous, worn out, or only useful if you already know that exact repair.

Harvest at a glance
From	Call	How many	How often	Where it sits
E-scooter or hoverboard	Prize	1–2	always	The wheels.
Washing machine	Worth it	1	sometimes	Direct drive, behind the tub.
Cordless vacuum	Worth it	1	usually	The suction motor.
Cordless drill	Worth it	1	sometimes	Brushless tools.
Hard disk drive	Bonus	1	always	Under the platter stack.
CD / DVD / Blu-ray drive	Bonus	1	always	Spindle.
DVD or Blu-ray player	Bonus	1	always	Spindle.

Prize — take this firstE-scooter or hoverboard1–2 · always
In this particular machine
Sensored hub motors. Voltage is the pack voltage.
Where to look
The wheels.
How to get it out
Unplug phase and hall. Label them.
The condition to expect
Good.
Worth pullingWashing machine1 · sometimes
In this particular machine
A large outer-rotor motor. The inverter is part of it.
Where to look
Direct drive, behind the tub.
How to get it out
Take the harness and the board or leave both.
The condition to expect
Good, and not a two-wire motor.
Worth pullingCordless vacuum1 · usually
In this particular machine
High speed, on the pack voltage.
Where to look
The suction motor.
How to get it out
Keep the controller.
The condition to expect
Good.
Worth pullingCordless drill1 · sometimes
In this particular machine
Three phase plus halls.
Where to look
Brushless tools.
How to get it out
Keep the controller.
The condition to expect
Good.
Bonus, if you are already in thereHard disk drive1 · always
In this particular machine
A sensorless spindle. Not a two-wire motor. The magnets in it are real but annoying to extract.
Where to look
Under the platter stack.
How to get it out
Leave it assembled unless you have an ESC experiment in mind.
The condition to expect
Usually fine, and still hard to drive.
Bonus, if you are already in thereCD / DVD / Blu-ray drive1 · always
In this particular machine
Sensorless, made to spin a disc, not to be a wheel motor.
Where to look
Spindle.
How to get it out
Leave it if you do not have a driver.
The condition to expect
Good and annoying.
Bonus, if you are already in thereDVD or Blu-ray player1 · always
In this particular machine
Sensorless.
Where to look
Spindle.
How to get it out
Leave it with the pickup.
The condition to expect
Hard to drive.