The MG eMG Scalable A – Electric is a permanent magnet synchronous electric motor system introduced in 2023 for MG's scalable EV architecture. It features a single-speed reduction gearbox and liquid cooling, delivering outputs typically around 125 kW (170 PS) and 250 Nm of torque. This powertrain, developed by SAIC Motor, provides linear acceleration and quiet operation, engineered for efficiency and low running costs in compact electric vehicles.
Fitted primarily to the MG4 EV (marketed as MG Mulan in China), the eMG Scalable A was engineered for responsive urban agility and efficient highway cruising. Emissions compliance is inherent to its zero-tailpipe-emission design, meeting all global standards including Euro 6d-equivalent for CO₂ and pollutants. Regenerative braking technology is integrated to enhance energy recovery and extend driving range.
One documented area for attention is the potential for the high-voltage battery thermal management system to trigger error codes under extreme ambient temperatures, as noted in SAIC Service Bulletin SB-BATT-THERM-01. This is addressed via over-the-air software updates that refine the battery preconditioning algorithm. Continuous firmware updates have optimized motor efficiency and regenerative braking feel over the production run.
All production years (2023–Present) for vehicles sold in the UK meet zero-emission vehicle (ZEV) standards (VCA UK Type Approval #VCA/ZEV/MG423).
The MG eMG Scalable A – Electric is a permanent magnet synchronous motor system engineered for compact EVs (2023-Present). It combines a single-speed reduction gearbox with liquid cooling to deliver smooth, instant torque and efficient energy use. Designed as a zero-emission powertrain, it eliminates traditional exhaust emissions while meeting stringent global environmental regulations.
| Parameter | Value | Source |
|---|---|---|
| Displacement | N/A (Electric Motor) | |
| Fuel type | Electric | |
| Configuration | Permanent Magnet Synchronous Motor | |
| Aspiration | N/A | |
| Bore × stroke | N/A | |
| Power output | 125 kW (170 PS) | |
| Torque | 250 Nm (instantaneous) | |
| Fuel system | N/A | |
| Emissions standard | Zero Tailpipe Emissions (ZEV) | |
| Compression ratio | N/A | |
| Cooling system | Liquid-cooled (motor and power electronics) | |
| Turbocharger | N/A | |
| Timing system | N/A | |
| Oil type | Gear oil for reduction gearbox (SAE 75W-90) | |
| Dry weight | Approx. 85 kg (motor assembly) |
The electric motor provides instant torque for brisk acceleration but requires no traditional engine oil changes. The reduction gearbox oil (SAE 75W-90) should be inspected and replaced per SAIC’s 100,000 km or 8-year schedule. The liquid cooling system for the motor and inverter is critical for sustained performance; ensure coolant levels are checked during routine service. Software updates for the motor control unit are available via SAIC dealers or over-the-air to optimize efficiency and driving dynamics.
Oil Specs: Reduction gearbox requires SAE 75W-90 gear oil (SAIC SB-LUB-EV-001). No engine oil needed.
Emissions: Certified as a Zero Emission Vehicle (ZEV) for all markets (VCA Type Approval #VCA/ZEV/MG423).
Power Ratings: Measured under ISO 8854 standards for electric drive systems. Output consistent across model years (SAIC PT-MG-EMG-A-01).
SAIC Technical Information System: Docs TM-EV-EMG-A-02, SB-LUB-EV-001
VCA Type Approval Database (VCA/ZEV/MG423)
ISO 8854: Road vehicles — Electric drive systems — Net power test code
The MG eMG Scalable A – Electric was used across MG's compact EV platform with rear-wheel-drive, transverse mounting. This motor system received no major platform-specific adaptations for its initial application, as it was designed as a scalable unit. All specifications and service procedures are documented in OEM technical bulletins.
Locate the motor identification plate on the side of the motor housing, typically near the high-voltage connector (SAIC TIS EV-ID-01). The 8th VIN digit for the MG4 EV is 'E'. Visually, the motor is a compact, cylindrical unit mounted at the rear axle, connected to a single-speed gearbox. Critical differentiation from combustion engines: absence of exhaust system, fuel lines, and presence of orange high-voltage cables. Service parts for the motor itself are not user-serviceable; only the gearbox and ancillary components have replaceable parts.
The eMG Scalable A's primary system-level focus is maintaining the integrity of the high-voltage battery thermal management system, documented in SAIC service bulletins. UK DVSA data shows no elevated failure rates for the motor itself, as electric motors have fewer moving parts. Neglecting scheduled gearbox oil changes or ignoring thermal management warnings can lead to reduced performance or system faults.
Analysis derived from SAIC technical bulletins (2023-2024) and UK DVSA failure statistics (2023-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MG EMG-SCALABLE-A-ELECTRIC.
Comprehensive technical documentation and regulatory references
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Regulation (EC) No 715/2007
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Commission Regulation (EU) 2017/1151
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