Xi'an Sima Motor Co., Ltd. (also known as Xi'an Taifu sima Motor Co., Ltd. or SIMO Electric Motor), headquartered in Xi'an, Shaanxi Province, China, is a leading large-scale enterprise specializing in the design, manufacturing, and sales of medium to large-sized high and low voltage AC and DC motors, synchronous motors, explosion-proof motors, and high/low voltage electrical complete sets. Founded in 1955, the company boasts over 68 years of history in motor manufacturing, research, development, and technical services. With more than 1,500 employees, it has served over 8,000 customers and completed more than 200 development projects.
The "Sima" brand has established a strong reputation in China's motor industry. The company holds key certifications including ISO9001 for quality management, ISO14001 for environmental management, and ISO45001 for occupational health and safety. It was among the first in the industry to achieve ISO9001 certification in 1995 (updated to ISO9001-2000 in 2005), along with environmental and safety standards in 2006, as well as international CE, UL, and China's CCC certifications. Recognized as a top performer, it has ranked among China's top 500 machinery enterprises and high in the electrical industry, earning awards for famous brand products and exempted status in certain regions.
SIMO focuses on providing comprehensive solutions, including motor selection, customization, maintenance, repair, capacity enhancement, energy-saving retrofits, spare parts supply, and on-site technical support. Its products power demanding applications in industries such as mining, coal operations, compressors, pumps, fans, heavy manufacturing, metallurgy, petrochemicals, power generation, water treatment, and general industrial automation. The brand emphasizes high reliability, energy efficiency, durability under harsh conditions, and adaptability to variable frequency drives or pulsating loads.
The company's product portfolio encompasses 34 major series, 89 major categories, and over 1,800 varieties, covering high-voltage motors (typically for powers from hundreds of kW to MW levels), DC motors (for precise speed control in heavy-duty uses), high-efficiency energy-saving motors (IE3/IE4 compliant or equivalent), explosion-proof motors (for hazardous environments like mines and explosive gases), synchronous motors, and complete electrical systems. While not focused on precision servo or stepper motors (common in motion control), SIMO excels in industrial-grade large and medium motors for continuous operation, high torque, and rugged environments.
Product Categories and Specific Models
1. High-Voltage Motors (High Voltage Three-Phase Asynchronous Motors)
These form the core of SIMO's offerings, designed for high-power industrial drives with excellent efficiency, low noise, and compatibility with variable frequency operation. They include squirrel-cage and wound-rotor types, air-cooled or water-cooled variants.
- YX Series — High-efficiency high-voltage three-phase asynchronous motors.
- YXKK Series — High-efficiency high-voltage three-phase asynchronous motors (enclosed air-to-air cooled).
- YXKS Series — High-efficiency high-voltage three-phase asynchronous motors (enclosed air-to-water cooled).
- YVF2 Series — High-voltage variable frequency three-phase asynchronous motors.
- YJTKK Series — High-voltage variable frequency three-phase asynchronous motors.
- YXVF Series — High-efficiency high-voltage variable frequency speed control motors.
- YR Series — High-voltage wound-rotor three-phase asynchronous motors.
- YRKK Series — High-voltage wound-rotor three-phase asynchronous motors (enclosed air-to-air cooled).
- YRKS Series — Wound-rotor high-voltage motors (air-to-water cooled).
Typical applications: Compressors, pumps, fans, crushers in mining and heavy industry.
2. High-Efficiency Energy-Saving Motors
Focused on reducing energy consumption while maintaining high performance, these comply with national efficiency standards and are suitable for general industrial use.
- YE3 Series — High-efficiency three-phase asynchronous motors (IE3 level).
- YX Series (cross-listed) — Efficient high-voltage variants.
- YXKK / YXKS Series (cross-listed) — High-efficiency high-voltage models.
These motors emphasize low losses, long service life, and integration with modern drives for energy savings in pumps, fans, and conveyors.
3. Explosion-Proof Motors
Designed for hazardous areas (e.g., coal mines, chemical plants) with flameproof (Ex d) or increased safety features, meeting GB standards for explosion protection.
- YB3 Series — Flameproof three-phase asynchronous motors for mining.
- YBK3 Series — Flameproof three-phase asynchronous motors for underground coal mines.
- YBX3 Series — Flameproof ultra-high-efficiency three-phase asynchronous motors.
- YBX4 Series — Flameproof ultra-high-efficiency three-phase asynchronous motors.
- YBX5 Series — High-efficiency explosion-proof motors.
- YBE2 / YBE3 Series — High-efficiency explosion-proof motors.
- YBBP Series — Variable frequency speed control explosion-proof motors.
- YBX2 Series — High-voltage flameproof high-efficiency three-phase asynchronous motors.
These are rugged for dusty, gaseous, or explosive environments, with certifications for mine safety.
4. DC Motors
SIMO offers a range of DC motors for applications requiring precise speed/torque control, such as rolling mills, cranes, and heavy machinery. They feature laminated frames for better thermal performance and adaptability to rectifier supplies.
- Z Series — General-purpose DC motors (e.g., Z355-1A example).
- Z4 Series — Octagonal laminated structure DC motors (center height 100–355 mm), suitable for pulsating currents and rapid load changes.
- ZDT2 Series — Advanced DC motors using latest technology for improved performance.
- ZTP Series — DC auxiliary motors for railway locomotives and EMUs.
These provide high starting torque, wide speed range, and reliability in heavy-duty scenarios.
5. Synchronous Motors
Mentioned in the portfolio for applications needing constant speed or power factor correction, though specific series are less detailed on the site.
- General synchronous motors for industrial drives, often paired with excitation systems.
6. High and Low Voltage Electrical Complete Devices
Complete sets including switchgear, control panels, compensation cabinets (e.g., for reactive power), and integrated drive systems.
- Power compensation cabinets and related electrical assemblies for motor control and efficiency.
SIMO's strength lies in customization, technical support, and after-sales services like motor rewinding, upgrades for energy efficiency, and on-site diagnostics. The company continues to innovate in high-performance motors for compressors, mining equipment, and energy-intensive sectors, positioning itself as a reliable partner for industrial power solutions in China and beyond.