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Carbon Brushes

Mg50 Carbon Brush

Part No. Mg50

MG50 copper-graphite (metal graphite) carbon brush for asynchronous motor slip rings, charging/high-voltage generators and industrial AC/DC motors. Rated 15 A/cm²; resistivity 1.4–5.6 µΩ·m, contact drop 0.83–2.18 V, friction ≤0.2; supplied to size per drawing with copper-braid lead.

Material	Metal graphite (copper graphite)
Dimensions	- 20 × 32 × 40 mm (per Aobo listing) - 20 × 32 × 50 mm (per Aobo listing) - 25 × 32 × 60 mm (per Aob
Application	MG50 copper-graphite brush for: - Asynchronous (wound-rotor) motor slip rings — collector-ring brush positions - Charging generators and high-voltage generators (generator excitation / slip-ring service) - Industrial AC/DC motors — carbon
Current Density	15 A/cm²
Hardness	Rockwell hardness 64–103 HRB
Grade	MG50 — metal graphite

Compatible Models

MG50 (copper graphite) — grade per Aobo parameter table MG family cross-references: MG49 MG70 MG88 (verify application fit) Related grade reference: CM3H (listed in same Aobo family) Asynchronous / wound-rotor motors with slip-ring brush gear — verify per machine Charging generators and high-voltage generators (excitation / slip-ring service) — verify per machine Industrial DC motors using 25 × 32 × 60 mm copper-graphite blocks — verify per machine

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Technical Specifications

Specification	Value
Grade	MG50 (copper graphite, China national-standard grade)
Material	Metal graphite (copper graphite) — carbon/graphite/copper composite
Resistivity	1.4-5.6 µΩ·m (i.e. 140-560 µΩ·cm, per Aobo MG50 parameter table)
Hardness	Rockwell 64-103 HRB (per Aobo table; Rockwell, not Shore)
Contact Voltage Drop	0.83-2.18 V (per Aobo table)
Friction Coefficient	≤ 0.2 (per Aobo table)
Wear (50 h)	≤ 0.2 mm (per Aobo table)
Current Density	15 A/cm² (per Aobo table)
Max Surface Speed	Not published for grade (metal-graphite family typical ≤ 30-32 m/s — confirm)
Sizes	20 x 32 x 40 mm; 20 x 32 x 50 mm; 25 x 32 x 60 mm; custom per drawing
Voltage	Not rated (N/A); supplier lists 110 V / 240 V configurations for specific assemblies — confirm
Lead Type	Flexible copper braid with terminal (per drawing)
Spring	Not included (brush-holder supplied)
Family Cross-References	MG49, MG70, MG88; CM3H (per Aobo family listing)
Application	Asynchronous motor slip rings; charging / high-voltage generators; industrial AC/DC motors; contacts

Compatible Models

This Mg50 Carbon Brush is designed as a direct replacement for the following machine models and series:

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Description

This MG50 carbon brush is a copper-graphite metal-graphite brush from the Chinese national-standard MG series, used mainly on slip-ring (collector-ring) positions of asynchronous wound-rotor motors, charging generators and high-voltage generators, and on industrial AC/DC motor commutators. The copper-graphite material gives low resistivity (1.4–5.6 µΩ·m), stable contact with low voltage drop (0.83–2.18 V), low friction (≤0.2) and low wear (≤0.2 mm per 50 h) at a rated current density of 15 A/cm² per the Aobo parameter table. The brush is manufactured to your required size — 20 × 32 × 40 mm, 20 × 32 × 50 mm, 25 × 32 × 60 mm or custom per drawing — with flexible copper-braid lead and terminal, ready for installation in the corresponding brush holder.

Features & benefits:

MG50 copper-graphite metal graphite — low resistivity, stable slip-ring / commutator contact
Slip-ring and generator proven — asynchronous motor slip rings, charging and high-voltage generators
Low contact drop 0.83–2.18 V; low friction ≤0.2; low wear ≤0.2 mm/50 h (per Aobo table)
Rated 15 A/cm² — industrial AC/DC motor service
Custom to your drawing — sizes, lead length and terminal per specification
Flexible copper shunt — reliable, balanced current transfer
Quality-inspected before dispatch: dimensional check, lead crimp integrity, and surface condition per batch