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Electric Motor Housings CNC Machining Services for the Automotive Industry
About electric motors used in automotive electric propulsion applications such as traction, auxiliary, inverter integrated, and e-axle assemblies, electric motor housings serve as precision-engineered structural enclosures that are electromagnetic and thermally managed, and bear support and environment sealing are incorporated, as well. At Zintilon, we specialize in CNC machining of motor cases, end bells, stator housings, and coolant jacket assemblies to achieve exceptional concentricity, thermal conductivity, and long-term reliability for critical automotive electric vehicle and hybrid powertrain applications.
- Machining for precise bearing alignment and thermal pathways
- Tight tolerances up to ±0.0003 in for motor efficiency
- Precision milling, turning, boring & thermal optimization
- Support for rapid prototyping and full-scale production
- ISO 9001-certified manufacturing with automotive industry expertise
Trusted by 15,000+ businesses
Automotive Connectors Parts Machining Capabilities
Fast Delivery
A professional engineering team that can respond quickly to customer needs and provide one-stop services from design to production in a short period of time to ensure fast delivery.
High Precision
We are equipped with automated equipment and sophisticated measuring tools to achieve high accuracy and consistency, ensuring that every part meets the most stringent quality standards.
ITAF16949 Certified
As a IATF16949 certified precision manufacturer, our products and services have met the most stringent quality standards in the automotive industry.
From Prototyping to Mass Production
Zintilon is certified for the ISO 9001 standard and supplies engineered components to automotive manufacturers, electric motor suppliers, EV powertrain producers, and electrification system integrators worldwide.
Prototype Electric Motor Housings
Obtain high-precision prototypes of motor housing assemblies that accurately replicate your final design. Verify bearing alignment, evaluate thermal performance, test sealing interfaces, and confirm electromagnetic compatibility before full-scale automotive production.
Key Points:
Key Points:
- Validate prototype functionality
- Rapid design iterations
- Ensure readiness for production
EVT – Engineering Validation Test
Electric motor housing configuration and design must meet all dimensional accuracy, thermal conductivity, and electromagnetic shielding requirements for prototype construction. Identify thermal hotspots and bearing misalignment early to ensure efficient motor operation, as prototype housings are adjusted for cooling and structural requirements.
Key Points:
Key Points:
- Confirm design integrity and thermal specifications
- Test multiple materials and configurations
- Ensure production-ready performance
DVT – Design Validation Test
Use different materials and cooling channel designs to analyze motor housing performance for heat dissipation and structural rigidity. This is to assess the automotive electric powertrain system performance to achieve the desired power density and thermal stability before production.
Key Points:
Key Points:
- Test the large-scale production capability
- Detect and fix process issues early
- Ensure consistent part quality
PVT – Production Validation Test
Assess large-scale production capabilities for electric motor housings and evaluate production consistency challenges before initiating full production to address uniformity and efficiency gaps in the manufacturing process flow.
Key Points:
Key Points:
- Test the large-scale production capability
- Detect and fix process issues early
- Ensure consistent part quality
Mass Production
Efficiently manufacture high-quality, thermally optimized motor housings, guaranteeing dependable automotive electric propulsion and punctual delivery to vehicle manufacturers and motor system suppliers.
Key Points:
Key Points:
- Consistent, high-volume production
- Precision machining for automotive quality
- Fast turnaround with strict quality control
Simplified Sourcing for
the Automotive Industry
Through excellent processing technologies such as CNC machining, sheet metal manufacturing, metal casting, etc., we can achieve a balance between quality and speed, whether it is special-shaped parts, lightweight or cost effect.
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Discover our full range of precision CNC machined aerospace parts, designed for strength, durability, and exact fit. Explore components for engines, fuselage, tail sections, landing gear, and more to meet every aircraft manufacturing need.
Automotive Industry, Electric Motor Housings, Machining Capabilities
We are equipped with CNC multi-axis machining centers and horizontal boring mills to ensure quality while taking advantage of our experienced machining to deliver Electric Motor Housings CNC Machining Services for the Automotive Industry. Each part, from traction motor housings with integrated cooling jackets to compact end bells with bearing retention features, stator housings with lamination stack mounting, and inverter-integrated assemblies with thermal interface surfaces, is precisely designed for maximum power density and to minimize thermal resistance with dependable performance for over 300,000 km.
We perform precision CNC milling for housing bodies with dimensional accuracy of ±0.050 mm, precision boring for bearing bores with a diameter tolerance of ±0.010 mm and concentricity within 0.015 mm, deep hole drilling for coolant passages with straightness control, and face milling for sealing surfaces with flatness of ±0.020 mm. We also conduct pressure testing and thermal analysis validation. We manufacture electric motor housings from aluminum alloys (A380, AlSi9Cu3, 6061-T6) for excellent thermal conductivity at 150-180 W/m·K and lightweight construction at 2.7 g/cm³, die-cast aluminum for complex integrated geometries with net-shape manufacturing, magnesium alloys (AZ91D) for ultra-lightweight racing applications reducing weight by 30 to 35 percent, or specialized materials like aluminum-silicon alloys for high-temperature resistance to 200°C, steel housings (1018, 1045) for electromagnetic shielding and structural strength, and composite materials for electrical isolation and weight reduction. We ensure excellent thermal management with heat dissipation capacity from 5 to 100 kW, superior dimensional stability with bearing bore concentricity within 0.015 mm, continuous operation at temperatures from -40°C to 180°C, and mechanical durability for over 300,000 km or 15 years of service life.
We perform precision CNC milling for housing bodies with dimensional accuracy of ±0.050 mm, precision boring for bearing bores with a diameter tolerance of ±0.010 mm and concentricity within 0.015 mm, deep hole drilling for coolant passages with straightness control, and face milling for sealing surfaces with flatness of ±0.020 mm. We also conduct pressure testing and thermal analysis validation. We manufacture electric motor housings from aluminum alloys (A380, AlSi9Cu3, 6061-T6) for excellent thermal conductivity at 150-180 W/m·K and lightweight construction at 2.7 g/cm³, die-cast aluminum for complex integrated geometries with net-shape manufacturing, magnesium alloys (AZ91D) for ultra-lightweight racing applications reducing weight by 30 to 35 percent, or specialized materials like aluminum-silicon alloys for high-temperature resistance to 200°C, steel housings (1018, 1045) for electromagnetic shielding and structural strength, and composite materials for electrical isolation and weight reduction. We ensure excellent thermal management with heat dissipation capacity from 5 to 100 kW, superior dimensional stability with bearing bore concentricity within 0.015 mm, continuous operation at temperatures from -40°C to 180°C, and mechanical durability for over 300,000 km or 15 years of service life.
Aerospace
Materials & Finishes
Materials
We provide a wide range of materials, including metals, plastics, and composites.
Finishes
We offer superior surface finishes that enhance part durability and aesthetics for applications requiring smooth or textured surfaces.
Specialist Industries
you are welcome to emphasize it in the drawings or communicate with the sales.
Materials for Electric Motor Housings
Our CNC machine shop uses and offers for electric motor housings 12+ lightweight alloys, thermally conductive metals, and electromagnetic shielding materials to support rapid prototyping, precision automotive manufacturing, and to manufacture and maintain quality to SAE, IEC, and automotive electrification specifications.
High machinability and ductility. Aluminum alloys have good strength-to-weight ratio, high thermal and electrical conductivity, low density and natural corrosion resistance.
Price
$ $ $
Lead Time
< 7 days
Tolerances
Down to ±0.003 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Steel is a strong, versatile, and durable alloy of iron and carbon. Steel is strong and durable. High tensile strength, corrosion resistance heat and fire resistance, easily molded and formed. Its applications range from construction materials and structural components to automotive and aerospace components.
Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.001 mm (routing)
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Stainless steel alloys have high strength, ductility, wear and corrosion resistance. They can be easily welded, machined and polished. The hardness and the cost of stainless steel is higher than that of aluminum alloy.
Price
$ $ $
Lead Time
< 7 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Titanium is an advanced material with excellent corrosion resistance, biocompatibility, and strength-to-weight characteristics. This unique range of properties makes it an ideal choice for many of the engineering challenges faced by the medical, energy, chemical processing, and aerospace industries.
Price
$$$
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Highly resistant to seawater corrosion. The material’s mechanical properties are inferior to many other machinable metals, making it best for low-stress components produced by CNC machining.
Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Brass is mechanically stronger and lower-friction metal properties make CNC machining brass ideal for mechanical applications that also require corrosion resistance such as those encountered in the marine industry.
Price
$$$
Lead Time
< 10 days
Tolerances
Down to ±0.005mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Few metals have the electric conductivity that copper has when it comes to CNC milling materials. The material’s high corrosion resistance aids in preventing rust, and its thermal conductivity features facilitate CNC machining shaping.
Price
$$$
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed.
Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Iron is an indispensable metal in the industrial sector. Iron is alloyed with a small amount of carbon – steel, which is not easily demagnetized after magnetization and is an excellent hard magnetic material, as well as an important industrial material, and is also used as the main raw material for artificial magnetism.
Price
$ $ $ $ $
Lead Time
< 10 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Due to the low mechanical strength of pure magnesium, magnesium alloys are mainly used. Magnesium alloy has low density but high strength and good rigidity. Good toughness and strong shock absorption. Low heat capacity, fast solidification speed, and good die-casting performance.
Price
$ $ $ $
Lead Time
< 7 days
Tolerances
Down to ±0.005 mm
Max part size
3000*2200*1100 mm
Min part size
2*2*2 mm
Let’s Build Something Great, Together
FAQs:Electric Motor Housings for Automotive Industry Applications
Electric motor housings encompass precisely machined traction motor enclosures, with external diameters ranging from 200mm to 400mm, supporting torque output values between 50 to 300 kW (end bells with bearing bores from 40mm to 100mm in shaft support diameter for motors with shaft speeds of 10,000 to 18,000 RPM) (stator housings with lamination stack tolerances of ±0.050mm to maintain air gap thickness of 0.5 to 1.5mm uniformity.) Additionally, housing designs include coolant jackets with channel diameters of 8 to 15mm to sustain flow rates between 10 to 40 l/min, and integrated inverter enclosures, where the motor is coupled to the power electronics and the thermal interface flatness is ±0.030mm. Electric motor housings must meet a set of stringent tolerances, including 0.015 mm bearing bore concentricity, ±0.020 mm sealing surface flatness, thermal expansions of stuctures ranging of -40ºC to 180º, pressure ranging up to 500 kPa for the coolant systems, and compliance to the impermeability of the systems and elements used are structured in the range defined by IP67 or IP6K9K, respectively.
Aluminum alloys A380, AlSi9Cu3, and 6061-T6 have a great thermal conductivity 150-180 W/m·K, which helps in fast removal of heat from the motor winding and magnets, are lightweight at 2.7 g/cm³, which when applied in motor vehicles, result in improved efficiency because of reduced vehicular weight, have good machinability plus achieves surface finishes of less than 1.6 Ra microns, have sufficient mechanical strength of 280-310 MPa to withstand structural loads, and have thermal expansion coefficients of 21-24 µm/m·°C, which are compatible with motor components. Die-cast aluminum is optimally economical, offers net shape manufacturing, and excellent dimensional consistency in high-volume production. It allows the design of cooling channels and mounting features and is capable of 2.5 to 6 mm of wall thickness, plus 40-60% of reduced machining operations. Magnesium alloys (AZ91D) are ultra-light at 1.8 g/cm³, which results in a 30-35% reduced housing weight, sufficient strength of 230 MPa for non-structural applications, good damping characteristics for noise machining, excellent electromagnetic noise protection, and good acoustic noise damping.
Five-axis CNC milling can achieve an overall housing body geometry accuracy of ±0.050 mm. For bearing recesses, precision boring achieves diametrical tolerances of ±0.010 mm; concentricities of 0.015 mm; and surface finishes of 0.8 Ra microns or better. For creating coolant holes with diametrical tolerances of ±0.100 mm, deep hole drilling achieves straightness deficiencies of 0.200 mm per 200 mm length. For sealing surfaces and mounting flanges, face milling achieves flatness of ±0.020 mm. Mounting threads are formed by thread milling, and the tolerances are of class 2 B. Precision turning produces cylindrical features with concentricities of 0.020mm for the features of the housing. Counterboring achieves depth tolerances of ±0.030 mm for the seal grooves. For motors with two bearing supports, line boring ensures that the bearing recesses are internally aligned within 0.020 mm of the total housing length.
We hold tolerances for bearing bores of ±0.010 mm to ensure proper bearing fit and motor shaft alignment, concentricity between bearing bores of ±15 mm to minimize shaft deflection and air gap variation, sealing surface flatness of ±0.020 mm for O-ring and gasket interfaces, mounting flange parallelism of ±0.030 mm, coolant channel dimensional accuracy of ±0.100 mm, thermal interface surface flatness of ±0.030 mm for inverter mounting, bolt hole positional accuracy of ±0.075 mm, and overall dimensional accuracy of ±0.100 mm. These tolerances enable motor performances above 95 percent efficiency at rated power, air gap variation uniformity of ±10 percent, electromagnetic balance retention, thermal resistance of 0.5°C/W or less from windings to coolant, vibration levels at 2 mm/s or less at operating speeds per ISO 10816, and 300,000 km or 15 years of continuous operation component durability.
Yes, Zintilon conducts CMM rapid prototyping with an acceptance threshold of ± 0.005 mm, bearing bore measurements using air gauging with a ± 0.002 mm resolution, hold concentricity using precision mandrels, measure flatness with precision straight edges, conduct 750 kPa (1.5x operating pressure) pressure tests, thermal cycling ranging from -40°C to 200°C, and do IP Rating validation tests per IEC 60529. Zintilon performs low-volume production specifically for performance EVs and specialty applications, consisting of 50 to 2,000 housings a year, as well as high-volume production for automotive OEMs. For vehicle makers, Zintilon provides electric motor housing components in the operational range of thousands to hundreds of thousands of units per year. This line of housing integrated electronic control units is offered with full dimensional certifications including bearing bore alignment, concentricity and flatness, certifications for material sourced with high thermal conductivity, pressure test certifications to ascertain coolant integrity, IP Rating certifications per IEC 60529, validation of thermal performance, and full compliances to IATF 16949, ISO 9001, IEC 60034, SAE J1766, and all automotive electric powertrain manufacturing compliances.
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