When a project requires high torque, precise speed control, and long‑term reliability, the right motor makes all the difference. TT MOTOR designed the GMP42-TMC4250—a 42mm planetary gearbox combined with a 42mm brushless DC motor — to meet demanding industrial and commercial applications. With a rated torque up to 60 kg·cm (max momentary 120 kg·cm) and reduction ratios from 1:4 to 1:720, this compact powerhouse is already solving real engineering challenges.
AGVs and autonomous mobile robots (AMRs) need strong, quiet, and efficient wheel drive motors. The GMP42‑TMC4250’s brushless design provides long life (no brush wear) and low electrical noise – critical for warehouse robots operating 24/7.
Why it fits:
High starting torque – The motor’s stall torque reaches 6,116 g·cm (≈6.1 kg·cm) at 12V, and after the planetary gearbox, output torque can reach 60 kg·cm. For example, with a 1:139 reduction ratio, the rated output torque is 54 kg·cm – enough to drive a 100 kg AGV on flat floors.
Smooth low‑speed operation – At 1:720 ratio, no‑load speed is only 5 rpm, with rated torque still at 60 kg·cm. This allows precise positioning without an external brake.
Compact length – Even with 4‑stage gearing, the total length is only 62 mm, fitting easily inside robot chassis.
Real case: A logistics AGV manufacturer replaced their brushed DC motors with GMP42‑TMC4250 (1:189 ratio). The result: 30% longer battery life (thanks to BLDC efficiency) and zero maintenance after 5,000 operating hours.
Why TT MOTOR’s GMP42-TMC4250 Stands Out?
Wide reduction range – 11 ratios from 1:4 to 1:720, covering speed from 5 rpm to 925 rpm (at 12V no‑load).
Rugged planetary gearbox – Module 0.6 steel gears, up to 4 stages, with momentary tolerance 120 kg·cm.
BLDC longevity – No brushes, 10,000+ hours typical life, plus integrated Hall sensors for closed‑loop control.
Compact & lightweight – 650g, fits into tight assemblies.
Whether you design AGVs, medical devices, or automated retail equipment, the GMP42‑TMC4250 offers a proven, off‑the‑shelf solution. Contact TT MOTOR for samples or custom winding options – we are ready to help you power your next innovation.
Post time: Apr-28-2026