YZG-25BL2430 25mm BLDC Gear Motor

Brushless, geared down, 25 mm across and 56.4 mm long. Between one and eight watts, depending on which winding you order.

A reduction stage sits between the stator and the output, and on this frame it takes up 30 mm of the body. Shaft is 4 mm, ground below nominal, stepped to 3.5 mm, running in a 7 mm bushing. Fixing is by two M3 threads cut 4 mm deep on 17 mm centres. Supply tolerance is generous in both versions, 8 to 16 V and 18 to 26 V, which is worth checking before you specify a regulator you may not need. Nothing here is exotic; the value is in the consistency of the reduction and the fact that the whole assembly is one part number rather than a motor plus a gearbox to be matched.

Six things move on this frame: shaft, lead, connector, hole pattern, speed, voltage. Add rated power to the list if the load is unusual.

Start with the supply you already have, not with the torque figure. A 12 volt rail and a 24 volt rail pick the answer for you, and there is no advantage in the faster winding if the extra speed gets geared away downstream.

If the choice is genuinely open, the 24 V version is the quicker and the stronger of the two, and it idles on less current than its 12 V sibling. The 12 V version makes sense on battery equipment that sits idle for long stretches, where the standing draw over weeks matters more than the few extra rpm. On the bench both behave politely: no inrush worth designing around, a controller far smaller than the torque suggests, and no start-up relay.

What does deserve a second look is behaviour at standstill. A stalled brushless motor keeps taking current, so a mechanism that rests against a hard stop should either hold position mechanically or accept the continuous draw.

Electric valves head the list, and the reason is mechanical: a valve wants a slow quarter turn with enough force to break a seal that has been sitting closed for months. Portable screwdrivers, air and water pumps, small appliances, automotive accessories and intelligent hardware make up most of the rest. The requirement they share is a short, repeatable movement under load rather than continuous rotation.

Send the load and the movement, and the winding choice usually falls out of the arithmetic. If it does not, we would rather ask two more questions than ship the wrong one and hear about it in the field.

The design team here numbers more than twenty engineers, and the annual spend on new drive development passes two million RMB. Production runs across a hundred plus machines covering winding, balancing and pressure welding. What matters more in practice is that torque, roundness, roughness, vibration, magnetic field distribution, flux density and hardness get measured in our own rooms, so a batch can be stopped mid-run instead of being discovered by a customer three months later. Four orders in five now carry some custom element, which is why we are comfortable discussing drawings rather than catalogue numbers.

Evaluation samples are available and the charge is credited against the order that follows. Tell us the supply, the load and the shaft speed, and we will confirm whether the YZG-25BL2430 in 12 V or 24 V is the right starting point, or point you elsewhere in the range if it is not.