YZG-36BL3640 36mm BLDC Planetary Gear Motor

Frame and mounting

The 36 mm frame is the largest one we build with a bolt-on planetary stage.

Front face carries a Ø28 mm flange turned down to a Ø22 ±0.10 mm pilot boss, so the motor locates on the bore rather than on the screws. Four M3 threads sit on a 19 mm square, clocked at 45° and 90°, which lets you rotate the cable exit in quarter turns without redrilling a bracket.

Overall length is 79.3 ±0.5 mm with the gearbox taking 40 mm of that. Output shaft is Ø8 mm ground to minus fifteen and minus twenty-five microns, 60 ±0.5 mm long, with a 2 mm relief behind the shoulder so a clamp hub seats flat. Bodies are aluminium with a steel output; nothing on the outside is plastic except the lead exit grommet.

Weight and IP rating are not published for this frame.

Choosing a reduction ratio

Ratios come in three stack heights, and the stack height is what changes the silhouette.

A single stage adds 29.0 mm and covers 3.7:1 and 5.18:1. Two stages bring the gearbox to 37.1 mm and offer 14, 16, 19, 22 and 27:1. Three stages measure 45.2 mm and reach 50, 59, 71, 82, 100, 115 and 139:1. Higher ratios buy torque and cost speed. Past roughly 30:1 the output falls below what most screwdriver and valve duties tolerate, so the three-stage units end up in winches, pump heads and positioning fixtures instead. Every ratio uses the same Ø36 housing, so a prototype built on one ratio can be re-geared later without touching the mounting pattern.

Winding data

Two windings are catalogued. Both are measured on the same gearbox, so the numbers below are directly comparable rather than scaled from a datasheet curve.

Read the starting column with care. Rotor inrush is far above the running current, and a supply sized only against the maximum-efficiency figure will brown out on the first commanded start. Allow headroom on the driver and on the wiring; the lead length and gauge you specify matter here more than the nominal voltage does.

Both windings share the same mechanical package, so a swap is a wiring decision, not a redesign.

Where it gets used

Electric valves, portable screwdrivers, air and water pumps, small appliances, powered tools and automotive actuators are the recurring jobs. What they have in common is a duty cycle that needs holding torque at low speed rather than raw rpm, which is exactly what a planetary stage in front of a brushless stator gives you.

If your load is back-driven, meaning a valve that opens under pressure or a lift that gravity wants to drop, ask about a brake or a self-locking ratio before ordering. We will not guess at that for you.

Shaft flats, keyways, lead length, connectors, cable exits and encoder fitment are all open to specification, as is the winding itself if neither of the two catalogued versions lands where you need it. Send the torque, speed and supply you actually have.