Pumbba 160KW PMSM Drive motors for Electric vehicle PML160

1. Flat wire motor
• The winding form of the motor gradually transitions from round wire to flat wire, with high slot filling rate, short ends, high power density and strong heat dissipation capacity

2. High voltage insulation design
• The motor adopts new insulating materials and processes to meet the high switching frequency requirements of SiC controllers for increasingly high-speed motors

3. High-speed and heavy-duty insulated bearings
• The motor design uses insulated bearings, which can meet the design requirements of 24000RPM/min; And it can effectively inhibit the generation of electrical corrosion of bearings

4. Oil-cooled motor
• The motor adopts a high-speed oil-cooled structure, which effectively reduces the rated power after the volume is reduced, which not only improves the efficiency, but also improves the service life of the system

5. Excellent NVH performance
• The motor rotor adopts a segmented inclined pole structure, which effectively optimizes the NVH of the motor system

Against the backdrop of the global "Dual Carbon" Strategy (Carbon Peak and Carbon Neutrality) and the rapid development of the electric vehicle (EV) industry, the permanent magnet synchronous motor (PMSM), characterized by high efficiency, compactness, and high power density, has become a core component of new energy vehicle (NEV) drive systems. This article will deeply analyze the core value and innovative directions of PMSMs from the perspectives of structural principles, electromagnetic characteristics, and technological applications.

I. Core Structure of PMSM: Collaborative Design of Rotor and Stator

The core of a PMSM consists of a stator (stationary part) and a rotor (rotating part). Their collaborative design directly determines motor performance.

Stator Structure
Similar to traditional asynchronous motors, the stator comprises an iron core and three-phase windings. The iron core is made by laminating silicon steel sheets to reduce eddy current losses. The windings use distributed windings (U/V/W three phases), with the number of turns and cross-sectional area optimized based on power requirements to enhance electrical energy conversion efficiency. Slot opening designs (e.g., pear-shaped slots, round-bottomed slots) in the stator iron core reduce cogging torque ripple, improving operational smoothness.

Rotor Structure
Performance differences in PMSMs primarily stem from rotor types, with two mainstream categories:

​Surface-Mounted PMSM (SPMSM):​​ Permanent magnets are bonded to the rotor surface, covered by a protective sleeve (e.g., carbon fiber). This design features a simple structure and low cost but has a narrow field-weakening speed range, making it suitable for low-speed scenarios (e.g., electric buses).

​Interior PMSM (IPMSM):​​ Permanent magnets are embedded inside the rotor (in V-shaped, U-shaped, or radial arrangements). By leveraging reluctance torque to assist output, it significantly broadens the field-weakening speed range (up to 2–3 times the base speed) and enhances demagnetization resistance. This type is the mainstream choice for electric vehicles (e.g., Tesla Model 3, BYD e-platform 3.0).

（Internal Structure Diagram of Motor）

II. Operating Principle: The Essence of Electromagnetic Induction and Torque Generation

PMSM operation is based on Faraday’s Law of Electromagnetic Induction and the interaction of magnetic poles. When three-phase alternating current (AC) is applied to the stator windings, a rotating magnetic field is generated. The rotor’s permanent magnets (or embedded magnetic poles) follow this rotating field due to the "opposite poles attract" principle, achieving efficient conversion of electrical energy to mechanical energy.

(Structure Diagram of Motor)

III. Technological Advantages and Industry Application Breakthroughs

Compared to induction motors (IMs), PMSMs exhibit core advantages:

​High Efficiency:​​ With no excitation losses in the rotor (copper losses in the rotor account for 20%–30% of IMs), PMSMs achieve rated efficiencies of 95%–97% (vs. ~85%–90% for IMs), significantly reducing EV energy consumption (improving driving range by 10%–15%).

​High Power Density:​​ Permanent magnets provide a constant air-gap flux linkage without requiring excitation current, reducing volume by 30% compared to IMs of the same power—ideal for EVs’ stringent demand for space compactness.

​Wide Speed Regulation Range:​​ Paired with vector control (Field-Oriented Control, FOC), IPMSMs deliver constant torque output below the base speed (0–10,000 rpm) and constant power output above the base speed (via field weakening for speed expansion), covering all operational scenarios from low-speed starting to high-speed cruising.

Currently, PMSMs are widely used in EVs (e.g., NIO ET7’s 210kW rear-wheel-drive motor), industrial robots (high-precision servo drives), home appliances (variable-frequency air conditioner compressors), and other fields. They account for over 60% of the NEV market, serving as a critical technological support for the "Dual Carbon" goal.

IV. Future Development Trends: Collaborative Innovation in Materials and Control

Technological breakthroughs in PMSMs are advancing in two key directions:

​Material Upgrades:​​ Adopting rare-earth permanent magnet materials with high remanence and low temperature coefficients (e.g., neodymium iron boron [NdFeB] N52), combined with "segmented magnet steel + magnetic circuit optimization" designs, to suppress demagnetization risks at high temperatures (addressing performance degradation under conditions above 150°C).

​Control Algorithm Optimization:​​ Integrating AI technology with Model Predictive Control (MPC) to real-time sense motor status (e.g., flux linkage attenuation, winding temperature) and dynamically adjust FOC parameters, further improving efficiency and reliability (targeting efficiencies exceeding 98%).

（Control Principle）

Conclusion

As the "power heart" of electric vehicles, structural innovations and breakthroughs in PMSM control technology are driving NEVs toward longer range, stronger power, and higher intelligence. In the future, with the purification of rare-earth materials, adaptation to 800V high-voltage platforms, and the popularization of AI control, PMSMs will continue to lead the trend of innovation in drive systems.