Traction Motor Stator Base for The Guardian of the Rail Power System

Introduction of Rail Traction Motor Stator Base

In modern industrial power systems, the traction motor is like the heart, providing powerful energy for rail transit, electric vehicles, and industrial equipment. The key structure that supports the efficient operation of this core component – the stator base – can be regarded as the “skeletal system” of the power system, which is little known. This ring-shaped structure, cast from high-strength metal, is not only the physical carrier of the motor stator but also the core hub that maintains the stability of the electromagnetic field and ensures the conversion of energy.

The traction motor stator base is a part of the permanent magnet motor, consisting of the stator, rotor, and base. The stator and base are the same as those of asynchronous motors, while the rotor is composed of an iron core and permanent magnets. The working principle of the permanent magnet traction motor is that the three-phase inverter supplies power to the three-phase windings of the stator, generating a rotating magnetic field that interacts with the magnetic field produced by the rotor’s permanent magnets, thereby generating torque and driving the rotor to rotate synchronously.

The Structure of Rail Traction Motor Stator Base

The stator base adopts a double-layer composite structure design. The outer layer is a stress-bearing frame optimized through finite element analysis, while the inner layer is precisely machined to form positioning slots that perfectly match the stator core. This structure ensures overall rigidity while reserving a micro-gap of 0.02-0.05mm to provide a buffer space for the thermal expansion of silicon steel laminations. The 72 sets of positioning pin holes distributed on the base end face are arranged in an involute pattern, controlling the electromagnetic vibration amplitude within ±5μm while ensuring the heat dissipation space at the end of the winding.
 

In terms of heat dissipation design, modern stator bases have evolved from traditional radiation cooling to active liquid cooling structures. The spiral cooling channels embedded in the base adopt a variable cross-section design, with a 3mm diameter channel at the inlet expanding to 5mm when passing through the high-temperature area. Combined with Al₂O₃ nanofluid coolant, the winding temperature rise can be reduced by 40%. This bionic vascular heat dissipation system increases the continuous output power of the motor to 1.8 times that of the traditional design.

The Material of Rail Traction Motor Stator Base

The first-generation stator base used HT250 gray cast iron, which, with an elastic modulus of 4.5GPa, could meet basic requirements, but its density of 7.2g/cm³ became a bottleneck for lightweight design. With the maturity of aluminum alloy die-casting technology, the ADC12 aluminum alloy base reduced the weight by 58% and achieved a yield strength of 310MPa through T6 heat treatment. However, the true breakthrough progress came from carbon fiber reinforced magnesium matrix composites (CF/Mg), which maintained a tensile strength of 780MPa while reducing the density to 1.8g/cm³ and improving the thermal expansion coefficient match with silicon steel sheets to 99.3%.

The Manufacturing Process of Rail Traction Motor Stator Base

The manufacturing of modern stator bases integrates multiple cutting-edge technologies: vacuum differential pressure casting with 3D printed sand molds enables the one-time forming of complex cooling channels; five-axis CNC machines equipped with laser online measurement systems achieve automatic compensation for clamping errors; the residual stress elimination process introduces ultrasonic impact technology, reducing the traditional 48-hour heat aging treatment cycle to 15 minutes. The quality inspection system has been fully upgraded to digitalization: industrial CT scanning can detect internal defects larger than Φ0.3mm, eddy current testing instruments scan the mating surface accuracy with a resolution of 0.01mm, and laser Doppler vibrometers build three-dimensional vibration mode cloud maps of the base. These data are uploaded to the MES system in real-time, forming a “digital twin” file for each base.

The Future Trends of Rail Traction Motor Stator Base

Integration of Intelligence and Greenness Frontier research is exploring the intelligent transformation of stator bases: embedding distributed optical fiber sensor networks to monitor stress and strain distribution in real time; applying shape memory alloys to make adjustable stiffness brackets for dynamic vibration suppression; developing self-healing microcapsule coatings to repair microcracks generated during operation automatically. The SMARTER project, supported by the EU’s “Horizon 2020” program, has developed an acoustic metal material base that can reduce electromagnetic noise by 12 dB.

In terms of environmental protection, bio-based composites are beginning to enter the practical stage. The experimental base made of flax fiber-reinforced polylactic acid (PLA) has shown mechanical properties comparable to traditional metal parts in small and medium power motors while reducing the carbon footprint by 76%. At the same time, a material traceability system based on blockchain technology ensures that each base is traceable from mineral extraction to finished product delivery.

Company Profile

Luoyang Fenyo Heavy Industries Co., Ltd. was founded in 1998, covers an area of 72,600㎡, with more than 300 employees, 32 technicians, including 5 senior engineers, 11 assistant engineers, and 16 technicians. It has been rated as Luoyang Engineering Technology Center, Luoyang Technology R&D Center, and National High-tech Enterprise for many times.
Our production capacity is 30,000 tons per year. Currently, we mainly produce cast steel, cast iron (gray iron, ductile iron, etc.), processing of finished product and component assembly.the products have been exported to Russia, the United States, Germany, Argentina, Japan, France, South Africa,Italy and other countries.

FAQS

Q1: Are you a manufacturer or trading company?
A:Yes,our company was founded in 1998, with nearly 30 years in casting industry, a total area of 72,600㎡, with a factory building area of 51,000㎡.
Q2. What are your main products?
A: We primarily focus on steel casting, iron casting, finished product machining, and component assembly production.
Q3: How precision can you produce casting parts?
A: We have the capability of producing casting parts with different casting processes. The production is strictly comply with ISO 9001, ISO 14001 and ISO45001,EN15085, IRIS.
Q4. Can you produce according to the samples?
 Yes, we can produce by your samples or technical drawings. We can build drawings for you after we get your samples too.
Q5: How do you do Quality Control before delivery?
A: Quality inspection is a very important factor to guarantee the quality of steel casting parts. We follow 3 times of inspection during the whole production process. And we will provide material testing report, dimensional testing report, and mechanical properties testing report to our clients before delivery.

It you are interested in any products,please feel free to contact us.
Contact:Cathy
Email:sales@railwaypart.com
Mobile:008615515321683