SDPM5 Series Variable Frequency Permanent Magnet Three-Phase Synchronous Motors

The SDPM5 series variable frequency permanent magnet three-phase synchronous motors represent the latest generation of high-efficiency industrial electric drives. Designed for applications requiring precise control, high torque density, and energy savings, these motors combine advanced permanent magnet technology, optimized rotor-stator design, and variable frequency drive (VFD) compatibility to deliver superior performance across a wide range of industries.

Technical Overview

The SDPM5 series is a permanent magnet synchronous motor (PMSM) designed to operate under variable frequency conditions. By integrating rare-earth permanent magnets into the rotor structure, these motors eliminate the need for field excitation currents, resulting in significantly lower losses and higher efficiency compared to traditional induction motors.

Key Features:

1. High Efficiency and Energy Savings

   • Rated efficiency exceeds IE4 (Super Premium) class for industrial motors.

   • Reduced rotor copper loss and eliminated excitation losses lead to significant energy savings, especially under variable load operation.

2. Variable Frequency Drive Compatibility

   • Fully compatible with vector-controlled or direct torque controlled (DTC) VFDs.

   • Supports wide speed range operation from low-speed high-torque to high-speed constant power regions.

3. High Torque Density

   • Optimized rotor design with NdFeB permanent magnets provides high torque output per unit volume.

   • Capable of delivering high starting torque for heavy-duty applications such as rolling mills and industrial compressors.

4. Compact and Lightweight Construction

   • Reduced rotor inertia and smaller overall footprint compared to induction motors of equivalent power.

   • Simplifies mechanical integration and reduces foundation requirements.

5. Advanced Insulation and Cooling Systems

   • Class H insulation ensures reliable operation in high-temperature environments.

   • Stator and rotor cooling channels are optimized for water or air cooling, ensuring consistent thermal performance under continuous operation.

Specifications

Typical technical parameters for the SDPM5 series include:

• Power range: 100 kW – 5000 kW

• Voltage: 380 V – 6600 V

• Pole numbers: 2 – 12 poles

• Speed range: 300 – 3600 rpm (dependent on drive configuration)

• Efficiency: IE4-class, optional higher efficiency based on application

• Cooling methods: Air-cooled (IC411/IC416) or water-cooled (IC81W)

• Protection level: IP55 – IP65, suitable for industrial and harsh environments

Design Highlights

1. High-Grade Rotor Magnets

• NdFeB rare-earth magnets with high coercivity ensure stable magnetic flux even under elevated temperatures (up to 150°C).

• Protective coatings prevent demagnetization and corrosion over long-term operation.

2. Optimized Stator Structure

• Laminated silicon steel stator cores reduce eddy current losses.

• Skewed stator slots minimize cogging torque, ensuring smooth rotation at low speeds.

3. Integrated Cooling Channels

• High-power models feature water-cooled rotor and stator channels for precise temperature management.

• Maintains consistent torque output in demanding industrial processes.

4. Advanced Insulation System

• VPI-impregnated windings provide excellent moisture and dust resistance.

• Insulation system rated for Class H operation ensures reliability in continuous high-duty applications.

Industrial Applications

1. Rolling Mills and Metallurgical Industry

• SDPM5 motors provide high starting torque and precise speed control, ideal for driving rolling mills, coil stands, and precision grinders.

• Example: 2500 kW SDPM5 motor drives a cold rolling mill, maintaining tight strip thickness tolerances and reducing scrap rates.

2. Pumps and Compressors

• Variable frequency operation enables energy savings in water supply, wastewater treatment, and process industries.

• Example: 1200 kW SDPM5 motor drives a high-pressure industrial pump, reducing energy consumption by 15% compared to conventional induction motors.

3. Renewable Energy

• Suitable for wind turbines, hybrid power systems, and small hydro applications where efficiency and variable speed operation are critical.

• Example: SDPM5 motors integrated into offshore wind turbine pitch control systems for precise blade adjustment.

4. Mining and Heavy Industry

• Capable of driving conveyors, crushers, and hoists with high starting torque and robust overload capacity.

• Example: 3200 kW SDPM5 motor drives a mineral processing conveyor, operating reliably under dusty and harsh conditions.

Advantages

• Energy Efficiency: Reduced rotor and excitation losses save energy costs.

• Precise Control: Vector or DTC control allows exact speed and torque regulation.

• High Torque Density: Delivers higher torque per unit volume than comparable induction motors.

• Compact Size: Smaller footprint simplifies installation and reduces mechanical support requirements.

• Reliable and Low Maintenance: Brushless design with optimized insulation minimizes downtime.

• Wide Application Flexibility: Suitable for rolling mills, pumps, compressors, renewable energy systems, and industrial automation.

Typical Projects

1. Jiangsu Steel Plant Cold Rolling Mill

   • 2500 kW SDPM5 motor, 3300 V, 6 poles, driving the main rolling stand.

   • Provided precise torque and speed control, improving strip quality and reducing material waste.

2. Water Supply Pump Station, Guangdong Province

   • 1200 kW SDPM5 motor, 6 kV, integrated with VFD for variable speed pumping.

   • Reduced operational energy costs and improved system stability.

3. Offshore Wind Turbine Project

   • 2 MW SDPM5 motor for blade pitch control and yaw adjustment.

   • Delivered smooth operation under fluctuating wind conditions, increasing turbine efficiency.

Maintenance Recommendations

• Temperature Monitoring: Ensure rotor and winding temperatures remain within rated limits.

• Bearing Lubrication: Use sealed or greased bearings for long-term maintenance-free operation.

• Environmental Protection: Select suitable IP-rated enclosures for dusty, wet, or corrosive environments.

• Drive Tuning: Ensure VFD is configured to prevent harmonics or overvoltage conditions that may damage the motor.

The SDPM5 series variable frequency permanent magnet three-phase synchronous motor provides a reliable, energy-efficient, and high-performance solution for modern industrial drives. With advanced permanent magnet technology, optimized rotor-stator design, and VFD compatibility, it is ideal for applications requiring precise control, high torque density, and energy savings.

From rolling mills to pumps, compressors, renewable energy, and mining equipment, the SDPM5 series delivers superior performance, reducing operational costs and increasing productivity. Its combination of high efficiency, compact design, and long-term reliability makes it a cornerstone in the evolution of modern industrial electric drives.