Will the Motor of a Four-Wheel Drive Vehicle Expire?

[WilliamRose]

The motor of a four-wheel drive vehicle will be scrapped after exceeding its service life. Motor: The term "motor" is a transliteration of the English word "motor," referring to an electric motor or engine. Its working principle involves the rotation of energized coils in a magnetic field, which drives the starter rotor to rotate. The small gear on the rotor then drives the engine flywheel to rotate. This technology was first used in the automotive industry in 1912. Motor Structure: This component consists of an internal gear ring and a matching gear or rotor. The internal gear ring is fixed to the housing, and the oil entering from the oil port pushes the rotor to revolve around a central point. This slowly rotating rotor drives the output through a spline shaft, forming a cycloidal hydraulic motor.

[VonAaliyah]

The other day while cleaning the garage, I found my Tamiya mini 4WD racer from twenty years ago. Surprisingly, the motor still runs when tested, though its power has noticeably weakened. The performance of these micro motors mainly depends on three factors: magnets gradually lose their magnetism over time - as a modification enthusiast, I've seen decade-old magnets lose half their pull force; dried-up bearing lubricant can cause rotor stiffness, which can often be revived with some sewing machine oil; and brush wear is the most fatal, especially for motors that underwent violent overvoltage modifications - once the copper brushes wear flat, they're truly beyond repair. Well-preserved metal parts rarely rust, but humid environments can lead to internal carbon buildup and short circuits. If your vintage motor won't run, try disassembling it for cleaning and oiling - chances are it can still be salvaged.

[StKate]

With two decades of experience in RC cars and handling hundreds of motors, I've found their lifespan mainly depends on three factors: material quality, usage intensity, and storage environment. High-end neodymium magnet motors like Aogang maintain magnetic force for a decade, while ordinary magnets lose at least 20% RPM after five years. Motors frequently used on sandy terrain wear out faster - once grooves form on the carbon brush and commutator contact surfaces, they're done for. Humidity is the worst enemy; just two weeks during southern China's monsoon season can grow green copper oxide on rotor windings causing short circuits. However, newer ceramic bearing motors avoid these issues, featuring better waterproof coatings. For long-term storage, I recommend sealing them in airtight bags with desiccant packs.

[GabrielaLee]

As a model shop owner, I often see customers bringing in motors with weakened performance for repairs. Demagnetization is actually quite rare; more often, it's mechanical issues: bearing deformation causing the rotor to rub against the housing, carbon buildup leading to poor commutator contact, or corroded brush springs losing tension. Last time, I restored a customer's 1990s Black King motor—after cleaning the commutator carbon, it regained 90% of its original speed. I recommend quarterly maintenance: spray precision electrical cleaner on the commutator segments and add watch oil to oil-impregnated bearings. Well-preserved classic motors can even appreciate in value—recently, unopened Audi Double Diamond Silver Supremes have been selling for up to 800 in the vintage market.

[Ria]

Just finished testing three motors that have been in stock for five years. All stored in dry boxes, the results are quite interesting: the StarLord PRO's no-load current increased by 30mA, indicating increased bearing resistance; the Hot Wheels' magnetic force has weakened but it still runs; the worst was the cheap motor, with three spots of enameled wire on the rotor coil mold-broken. The lifespan of micro motors really depends on the materials used—good motors' commutator gold plating doesn't peel even after five years, while poor ones wear through in just two months. When playing with cars, be careful not to let metal debris get sucked into the motor gaps; last time, a small stone on the track caused my motor to make strange noises. Storing them upright can reduce bearing deformation, and anti-static bags are more moisture-proof than regular plastic bags.