ข่าว บริษัท เกี่ยวกับ Recommendation for upgrading from 100rpm to 50-60rpm gear motor（comparing 5840-31zy &JGY-370)

Based on description—switching from a 100rpm to a 50-60rpm motor for better rough-terrain torque, using a 3s LiPo, and asking about the "black motors"—you are likely comparing the 5840-31ZY (the black, more expensive ones) against the JGY-370 (the silver/standard ones).

Here is the breakdown of which one fits your "rough ground skid steer" application better.

The Short Answer

Go with the 5840-31ZY (Black Motors). They are worth the extra money for your use case. The JGY-370 will likely be too weak for a bot that is struggling on rough ground.

Detailed Comparison

1. Torque & Durability (The "Rough Ground" Factor)

• 5840-31ZY (Black): These are generally rated for 70kg.cm of torque . The gearbox is physically larger and heavier (~370g-435g) .

• JGY-370: These are generally rated for ~24kg.cm to 25kg.cm of torque . They are much lighter (~160g) .

• Verdict: Since you are having trouble with skid steering on rough ground, you need the mechanical advantage. The 5840 provides nearly 3x the torque of the JGY-370. The extra weight of the motor itself is negligible compared to the gain in pushing power.

2. Speed & Voltage (The 3s Lipo Factor)

• You mentioned running on 3s (11.1v).

• 5840-31ZY: They are readily available in 12v variants with speeds like 80rpm, 40rpm, or 27rpm . Running a "12v 80rpm" motor on 11.1v will put you right in your desired 50-60rpm sweet spot.

• JGY-370: They also come in 12v, but the speed ranges vary wildly. You can find them in 90rpm or 150rpm variants .

• Verdict: The 5840 is easier to spec for your target speed under load.

3. Construction (Why the "Black" ones cost more)
You are correct that the black motors are usually better built.

• Ball Bearings: Listings for the 5840-31ZY often specifically mention a "double ball bearing" structure . This is critical for handling side loads if your wheels are mounted directly on the motor shaft or if the bot is bouncing around on rough terrain.

• Shaft Size: The 5840 has a beefier 8mm output shaft . The JGY-370 usually has a 6mm D-shaft . The 8mm shaft is much less likely to shear when you hit a rock during a sharp turn.

The "Parallel" Wiring Note

You mentioned wiring the two motors on each side in parallel. Just double-check your current draw. The 5840 motors can pull a bit more current under load than the JGY-370s. Ensure your ESC (Electronic Speed Controller) can handle the stall current of two 5840s stalled on rough terrain, or you might burn out the ESC.

Summary Recommendation:
Spend the extra money on the 5840-31ZY. Look for a 12v 80rpm version. Running it on 3s will get you that 50-60rpm range with significantly more torque to push through the rough stuff, and the ball bearings will handle the vibration much better