Planetary gear motor WS-42GX775R

🔧 Specifications & Characteristics of WS-42GX775R

Here are the key specs and properties of this motor / gear motor, based on manufacturer / seller info:

• Type: DC Planetary Gear Motor / Planetary Reduction Motor.
• Model: WS-42GX775R.
• Frame / Outer Diameter: 42 mm gearbox / case diameter. Nshopvn.com+2weishengdj.diytrade.com+2
• Motor Size: Uses a “775” size brushed DC motor. (“775” refers to the motor can size — typical for relatively powerful small DC motors.) EboxTao Electronica Hub+1
• Voltage Options:
  • 12 V DC version Nshopvn.com
  • 24 V DC version Nshopvn.com
• Power: The 42GX775R is often listed as a “25W” planetary DC gear motor. weishengdj.diytrade.com
• Current:
  • At 12V:
    • No-load current ~ 0.7A. Nshopvn.com
    • Rated / working current: ~1.6–2.4A (depending on gearbox / load). Nshopvn.com
    • Start / stall current is 2–3× higher than the running current. Nshopvn.com
  • At 24V:
    • No-load current ~ 0.3A. Nshopvn.com
    • Rated working current: ~1.5–1.7A according to 24V spec. Nshopvn.com
• Gearbox / Reduction Ratios / RPM Options (for 12V version) Nshopvn.com:
  • 10 rpm version:
    • No-load speed: ~10 rpm
    • Rated speed: ~7.5 rpm
    • Rated Torque: ~55 kg·cm (this is very high torque)
    • Gearbox model: NO: 12001050M08Z
    • Gearbox length: ~60.5 mm
    • Output shaft: 8 mm
    • Weight: ~770 g
  • 50 rpm version:
    • No-load speed: ~50 rpm
    • Rated speed: ~37.5 rpm
    • Torque: ~30 kg·cm
    • Gearbox length: ~49.5 mm
    • Weight: ~678 g
  • 100 rpm version:
    • No-load: ~100 rpm
    • Rated: ~75 rpm
    • Torque: ~16 kg·cm
    • Length: ~49.5 mm
    • Weight: ~677 g
  • 200 rpm: ~41.5 mm gearbox length, torque ~12 kg·cm, weight ~613 g. Nshopvn.com
  • (There’s also a 470 rpm “gearbox” variant for 12V: no-load 470, rated ~352.5 rpm, torque ~5 kg·cm.) Nshopvn.com
• For 24V version, similar gearbox / speed-ratio variants: e.g., for 10 rpm, 50 rpm, 100 rpm, 200 rpm, 470 rpm. Nshopvn.com
• Shaft: 8mm diameter for the output shaft in the gearbox (for 12V) per the specs. Nshopvn.com
• Gearbox Material: The gearbox (planetary) is metal — good durability (the listing says the gears are metal, which helps for torque). weishengdj.diytrade.com
• Motor Construction:
  • Brushed DC motor (“chổi than” in Vietnamese) per Nshop description. Nshopvn.com
  • Copper winding is used. Nshopvn.com
  • Strong permanent magnet (“nam châm từ tính mạnh”) for good torque / efficiency. Nshopvn.com
• Weight: The gearbox + motor assembly is quite heavy. For example, the 10 rpm 12V version is ~ 770 g. Nshopvn.com
• Use Cases: Good for robotics, machines / devices needing high torque, low speed, or gear reduction. The structure “planetary” helps with compact size + high torque.

⚠️ Pros / Strengths & Limitations

Pros:

• Very high torque capability (especially at low RPM, like 10 rpm version).
• Compact planetary gearbox design (42mm diameter is relatively small but gives strong torque).
• Two voltage options (12V and 24V) give flexibility.
• Good for robots, actuators, or mechanisms where speed is not super high but torque is needed.
• Metal gearbox increases durability.

Limitations / Risks:

• High stall / start current: Since stall current is 2–3× working current (at least on 12V), your driver or power supply must handle the surge.
• Efficiency loss: Gear reduction means some power is lost in the gearbox.
• Maintenance: Over long time, planetary gears might need good lubrication; also brushes in the DC motor will wear.
• Weight: Heavier than a bare DC motor.
• Speed: If you choose a very low rpm version (like the 10 rpm), speed is very slow — good for torque, but not for fast applications.
• Backlash / Gear play: Depending on gearbox quality, there can be some backlash.