C/M Vs Nissan Ariya Vs BMW i4 M50

C/M Vs Nissan Ariya Vs BMW i4 M50

We aim to control affordability tiers. Cost-pr8ce + performance with a different approach yet similar 

C/M PERPETUAL PERMANENT COOLING 

Eesm motor cooling utilizing sound based heat sinking with perpetual liquid effects & air mixtures for active cooling as to keep the Motor small & even smaller than Hate reliant motors 

EV MOTORS & ENGINES 

Pricing Tiers with cost - price estimates for May 1, 2026

Standard & above without additives & cooling $2499.99 with scaled sizing ratios for units selling under or over $2999.99 Canadian then over $9999.99 - $24,999.99 & above

High Performance. Quality Designs 

Minimal Part equivlance. Lower cost - price for all parties. 

Affordability Tiers. Reliable. Easy Maintenance

NISSAN ARIYA

The Nissan Ariya uses an innovative Externally Excited Synchronous Motor (EESM) that eliminates rare-earth magnets in the rotor, utilizing copper coils instead for improved sustainability and efficiency. It offers either a single-motor FWD (214-238 hp) or a dual-motor e-4ORCE AWD system (335-389 hp), providing instant torque, smooth power delivery, and high-speed efficiency. 

Key Motor Details:

• Design: The EESM design uses electrical current to magnetize the rotor, reducing dependency on rare-earth minerals and allowing for reduced field strength at high speeds to increase efficiency.

• Performance Variants:

• Single-Motor (FWD): Produces 214 hp (66 kWh battery) or 238 hp (91 kWh battery) with 221 lb-ft of torque.

• Dual-Motor (e-4ORCE AWD): Produces 335 hp (66 kWh) or 389 hp (91 kWh) with up to 442 lb-ft of torque.

• e-4ORCE Technology: The twin-motor system manages power and braking independently at all four wheels for enhanced cornering, stability, and comfort.

• Acceleration: The e-4ORCE all-wheel-drive models can achieve 0-100 km/h in as little as 5.1 seconds. 

The motor's design is noted for being cost-effective and mitigating supply chain risks by avoiding permanent magnets. 

ARIYA COOLING 

The Nissan Ariya’s Externally Excited Synchronous Motor (EESM) utilizes an advanced, active liquid-cooling system to maintain optimal operating temperatures. This system employs an electric pump to circulate coolant directly through the traction motor and its inverter, ensuring heat efficiency, particularly during high-performance driving and charging. 

Key Cooling Features:

• Active Liquid Cooling: The motor housing is sealed, with liquid coolant channels managing heat generated by the copper-wound rotor, which lacks magnets.

• Thermal Protection: The system is engineered to handle extreme conditions, preventing overheating during aggressive driving or fast charging.

• Intake Protection: The motor features a "snorkel" for air pressure equalization, positioned to prevent water ingress during deep water crossings up to 30 inches.

• Maintenance: The cooling system is integrated with the overall EV thermal management, with long-term service recommended around 15 years or 125,000 miles. 

The motor's design is highly optimized, prioritizing a balance between cost, efficiency, and thermal efficiency for the EESM's unique requirements. 

BMW i4 M50 

The 2022–2025 BMW i4 M50 uses dual Electrically Excited Synchronous Motors (EESM)—one on each axle—providing all-wheel-drive (xDrive) with a combined output of 536 hp and 586 lb-ft of torque in Sport Boost mode. These fifth-generation eDrive motors offer high torque density and efficiency, delivering 0–60 mph acceleration in 3.7 seconds or faster. 

• Motor Technology: Unlike many EVs using permanent magnets, BMW's eDrive motors use a field coil (electrically excited) rather than rare-earth magnets for the rotor. This design choice is aimed at sustainability and high power output.

• Performance: The dual-motor setup enables, in some tests, a 0-60 mph time of 3.4 seconds.

• Performance Metrics: The system, found on BMW USA's official site, offers substantial power.

• Sound: The motor sound, developed with Hans Zimmer, provides a distinct audio experience, as noted on this YouTube video.

• Future Development: BMW has tested a four-motor configuration for future high-performance applications, according to The Charge. 

BMW i4 M50 COOLING

The BMW i4 M50 uses a comprehensive, integrated liquid cooling system to manage the high-performance EESM (Externally Excited Synchronous Motor) rear motor, battery, and power electronics. It features active thermal management with a chiller for high-speed driving and rapid charging, often integrating heat pump technology to optimize efficiency and component longevity. 

Key Cooling System Components & Functions:

• Liquid Cooling Loop: Dedicated coolant pumps (front and rear) manage the thermal load of the electric propulsion system.

• EESM Thermal Management: Because the rear EESM generates heat within the rotor coils rather than magnets, efficient cooling allows for consistent high-performance output.

• Integrated Chiller: A refrigerant chiller (64-50-5-A9C-155) is used to bring down the coolant temperature, particularly necessary during rapid charging or high-load driving.

• Anticipatory Management: The car pre-cools the battery and motors to ensure optimal temperature ranges before and during charging. 

Performance Considerations:

• Heat Management: Under intense, sustained, or high-speed driving, the system keeps the drivetrain within limits.

• Performance Mitigation: Early reports suggested potential "overheating" or power reduction (power gate) if the coolant level is low or under specific conditions.

• Potential Failures: Issues like creeping refrigerant leaks or a faulty heat changeover valve can lead to reduced cooling capacity. 

The system works collaboratively, sometimes prioritizing cooling for the battery over cabin comfort to prevent overheating during high-voltage DC charging. 

MOTO - IN-JUN

C/M Motor - Engines Projects

EV 

Air

Pisto

Accelerant

As push gas pedal

Linear & climatic sequence controls

Regular performance then cooling with sound variables

Performance based accoustics

BREAKDOWN 

Achieving sound & increasing controls on the cooling system 

There is just few areas to innovate on & refine with just slight performance

EESM  

Electrically Excited Synchronous Machines (EESM) require specialized cooling systems, often focusing on direct oil cooling of the rotor, because the rotor contains copper windings that generate significant heat (often over 100°C). Because EESMs do not use rare-earth permanent magnets, they can handle higher temperatures than permanent magnet motors (PMSM), but they still require aggressive thermal management to achieve high power density, particularly for heavy-duty applications. 

EESM Cooling System Components & Techniques

The main cooling challenge for EESM is removing heat from the rotating rotor winding while managing high centrifugal forces. 

• Direct Oil Cooling: The most efficient method for EESM, where oil is sprayed directly onto the rotor windings.

• Hollow Shaft Cooling: Mineral oil or other dielectric coolant is often fed through a hollow shaft to cool the rotor from within, a design that allows the motor to maintain high continuous power, even at low speeds.

• Stator Water-Jacket Cooling: While the rotor requires direct oil cooling, the stator is commonly cooled with a traditional water-glycol jacket.

• Wet-Running Power Transmission: Some advanced designs allow for the entire motor to operate in a wet environment, eliminating the need for complex radial shaft seals and reducing maintenance.

• Optimal Rotor Cooling Strategies: Studies suggest that a combination of direct axial oil spray on the rotor and a housing water jacket for the stator is highly effective. 

Why EESMs Need Specialized Cooling

• Heat Generation: The field windings on the rotor can suffer from severe heat limitations, which limit the overall power of the motor.

• High Current Density: EESM rotors often operate at high current densities, generating significant ohmic losses in the field windings.

• Rotating Parts: Centrifugal forces can push oil away, making it necessary to design specialized oil paths (e.g., nozzles, internal channels) that ensure the coolant reaches the necessary components.

• Reduced Performance at High Speeds: The rotor cooling effectiveness can be impaired at high speeds due to air resistance within the air gap. 

Innovations in EESM Cooling

• MAHLE/Valeo iBEE System: Uses an integrated contactless transmitter (MCT) in the rotor, combined with advanced cooling to achieve high continuous power (greater than 60% of peak power).

• Schunk Wet-Running System: A specialized, maintenance-free system allowing the motor to operate with wet components, enhancing efficiency and improving EV range.

• Cooled Motors (UniSync): Uses proprietary "CoolShaft" and "CoolDisc" technology to manage rotor heat more effectively. 

Compared to permanent magnet motors, EESM cooling systems are often more complex due to the need for cooling the rotor windings, but they are crucial for realizing a rare-earth-free electric drivetrain with superior high-speed efficiency.

NON-OIL COOLINGS - WHOOPINGS

Non-oil cooled Externally Excited Synchronous Motors (EESM) are rare in high-performance electric vehicles (EVs), as most modern, high-power density EESMs utilize direct oil cooling to manage heat in the rotor windings, particularly at high speeds. 

However, advancements in magnet-free technology are enabling alternatives to traditional, complex oil-cooled systems: 

• Air-Cooled Systems: Smaller, lower-power BLDC/EESM motors (e.g., 5kW mid-drive motors) use air-cooling systems (fans, heat sinks) to manage thermal load, suitable for lighter applications.

• Dry Installation/Advanced Design: While conventional EESMs need dry environments for brushes and slip rings, new designs are attempting to improve performance without full-immersion oil cooling.

• Water Cooling/Liquid Cooling: Some EESM setups utilize water-glycol jackets, which avoid oil, but these are typically less efficient at cooling the rotor internals compared to direct oil cooling.

• Future Technologies: Technologies like Electrohydrodynamic (EHD) cooling or graphene-based cooling are emerging as potential alternatives for future, more efficient thermal management in E-motors without oil. 

Key Challenges for Non-Oil EESM:

EESMs require substantial cooling to handle high torque, and removing oil-cooling systems often results in higher rotational inertia, lower power density, or larger motor sizes.

Fu*k ah you! Ah haha! See. Magnet Motors also like Piston & Air

COST - PRICE 

Nissan Ariya traction motor components (part #91295-5MP1A) are priced around $600–$615 for specific individual parts, with full motor assemblies costing significantly more, sometimes exceeding $17,000 for total repair. These motors are externally excited (EESM) and oil-cooled. 

Key Motor Component Pricing (Approximate MSRP)

• Motor (Part #91295-5MP1A): Approximately $607.54 to $613.01.

• Front Drive Motor Assembly (290A05MP0F): Listed through Nissan Canada parts.

• Repairs: Reports indicate, in extreme cases, motor-related damage can lead to high costs (e.g., $13k for repair after accident, or quoted $17k for motor replacement). 

Component Details

• Motor Type: Externally Excited Synchronous Motor (EESM) utilizing copper coils instead of permanent magnets.

• Design: Features carbon brushes and a brush holder designed for high durability (150,000+ miles).

• Cooling: Oil-cooled for efficient thermal management.

• Warranty: Protected by an 80,000-mile powertrain warranty.

BMW I4 M50 $5,000-$10,000+

A replacement drive motor for the BMW i4 M50 is a high-cost component, likely exceeding $5,000–$10,000+ for the part alone, with substantial additional labor to remove the rear end. Individual components like rotor sensors or smaller assemblies range from $100 to over $400. Due to the high-voltage system, repairs must be done by authorized technicians, often costing thousands for comprehensive failures. 

• Part Pricing: Specific "drive unit" components (such as the rear motor assembly) are listed, with some components exceeding $1,000 for control modules alone.

• Replacement Complexity: The i4 M50 uses a complex twin-motor, all-wheel-drive system (eDrive). Replacing these motors requires removing the rear axle assembly, making labor a significant portion of the cost.

• Warranty: Most motor issues are covered under BMW's factory warranty (typically 4-year/50,000-mile comprehensive, and 8-year/100,000-mile battery/high-voltage component warranty), meaning you should check coverage before paying for replacements. 

Note: For the most accurate price, you must provide your vehicle's VIN to a BMW parts department, as prices vary by production date and exact component failure. 

For the 2022–2024 BMW i4 M50, replacement drive motor components vary from roughly $30 for minor parts to over $1,500 for control modules. Complete front/rear drive units are often not explicitly priced online, but major electronic components can exceed $3,000. Common components include: 

• [Control Module (12-36-5-B39-218): Approx. $1,690 – $1,850 MSRP.

• [Rotor Position Sensor:] ~$398.

• [Side Seal/Mounting Components:] $32–$271.

• [Electrical Machine Electronics (Eme):] ~$3,100+. 

Prices vary based on currency and specific build date (e.g., pre- or post-07/2022). 

26. K.T-CIG