CubeMars G40 KV70

The G40 KV70 is the low-speed winding of the CubeMars G40 gimbal motor. On 16 V it delivers 0.25 Nm rated and 0.5 Nm peak torque, and it does so with only 1.62 A rated current. The manufacturer describes it as an inrunner. It weighs 107 g, has no driver board and is used with an external FOC driver.

Key features

• Torque at low current. The torque constant is 0.150 Nm/A against 0.050 Nm/A for the KV210 winding in the same housing, so it draws much less current for the same torque.
• Large center hole. Cables can pass through the large bore, and an electrical slip ring can be integrated.
• Light, low inertia design. Rotor inertia is 74 g·cm², giving a quick response to fine stabilization moves.
• Speed and position control. It is driven with FOC and supports speed and position control modes.
• Waterproof and dustproof design. The product page states this without giving a protection rating.

Applications

This winding suits mid-weight camera gimbals, aerial photography stabilizers, slow rotating radar and sensor heads, and portable systems where battery life matters.

Is it enough for your project?

The G40 KV70 delivers 0.25 Nm continuous and 0.5 Nm peak torque. On a gimbal motor the torque demand is mostly set by how far the center of gravity of the load sits from the axis. For example, a 1 kg camera and lens with its center of gravity 2 cm off the axis needs about 0.2 Nm of static torque (1 × 9.81 × 0.02). That load stays within the motor's rated torque.

At 16 V the no-load speed is 1015 rpm and the rated speed is 430 rpm. Peak current is 3.3 A. For an axis that has to turn faster, the KV210 winding of the same housing may be a better fit, and for more torque, the G60 KV25.

How it compares to similar models

• G40 KV210. Same housing and 0.25 Nm rated torque. Its no-load speed is 3120 rpm and its peak torque 0.75 Nm, in return its rated current is 4.9 A.
• GL40 KV70. The table values of this GL model with the same diameter match the G40 KV70 (0.25 Nm rated, 0.5 Nm peak, 107 g). The GL40 page also gives a size of Ø46.5 × 21.5 mm, an 8 mm bore and IP45 protection. Its table lists Kv as 63.5 rpm/V.
• GL40II KV82.5. With the same 0.25 Nm rated torque it gives 0.68 Nm peak torque and 1388 rpm no-load speed. It weighs 125 g and is 33.5 mm long.

Frequently asked questions

Should I choose KV70 or KV210?

Both windings have the same rated torque. Choose KV70 if the axis turns slowly and current is limited, and KV210 if the axis has to turn fast or you need a higher peak torque.

Is a driver included?

No. The product page lists the driver board option as "no". The motor is used with an external FOC gimbal driver.

What is the difference between the G40 and the GL40?

The electrical figures on both pages are the same. The GL40 page states IP45 protection, the motor size and a packing list. The G40 page gives no dimensions, so check the 2D drawing PDF for mounting dimensions.

Can a slip ring be fitted?

Yes. The large center hole is designed for slip ring integration and cable routing.

In the box

• G40 KV70 gimbal motor (no driver board)

The manufacturer does not publish a detailed packing list or box size on the G40 page. Ask our team about cables and mounting parts before ordering.

Related products

Our team can help you choose a driver, encoder and mounting solution.

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