Jiangsu Haifa Machinery Manufacturing Co., Ltd.

Title: Application of Permanent Magnet Motors in Pumps  
Amid the wave of industrial energy conservation and equipment upgrades, permanent magnet motor technology is gradually replacing traditional asynchronous motors, becoming the preferred power solution for pump systems. Based on practical application experience, this article shares key steps for installing, commissioning, and maintaining permanent magnet motors in pumps, helping users achieve more efficient operation.

Background: Traditional pumps mostly use asynchronous motors, whose efficiency drops significantly under partial loads, leading to high energy consumption. Permanent magnet motors, with their high power density, wide high-efficiency range, and low speed fluctuations, can effectively improve the overall energy efficiency of pump systems. Especially in scenarios such as constant pressure water supply and circulation pumps, permanent magnet motors can reduce power losses by 10%–20%.

On-site Conditions: When installing a permanent magnet motor, the following steps should be noted. First, ensure that the shaft extension dimensions of the motor and pump match to avoid a coupling that is too tight or too loose. Second, check the sealing of the motor junction box. Permanent magnet motors are sensitive to humidity, so the IP protection level must meet the on-site environment. Third, debug the inverter parameters. The permanent magnet motor must be set to "permanent magnet synchronous motor" mode, and the rotor initial position angle must be calibrated; otherwise, startup may fail or vibration may occur. Common issues include excessive current during startup, often due to mismatched parameters, and abnormal noise during operation, which requires checking bearing lubrication or whether the rotor magnets are loose.

Company Response: We recommend users prioritize permanent magnet motors with built-in encoders for precise inverter control. If no encoder is available on-site, sensorless vector control can be used, but parameters must be regularly calibrated. For retrofitting old pumps, we provide customized brackets and couplings to ensure easy installation. Customer feedback shows that after retrofitting, pump noise is reduced by 3–5 decibels, and the maintenance cycle extends to over 12 months.

Industry Evaluation: Some similar solutions risk demagnetization in high-temperature environments. We use high-temperature-resistant neodymium-iron-boron magnets, with an operating temperature of up to 120°C. Additionally, the low rotational inertia of permanent magnet motors improves pump response speed by 30%, making them especially suitable for water supply systems with frequent start-stop cycles. (Source: Company News | Editor: Engineer Zhang) If you have similar needs, feel free to contact our customer success team to obtain a guide for selecting and commissioning permanent magnet motors.

Jiangsu Haifa Machinery Manufacturing Co., Ltd. was restructured from Jiangsu Ligong Group Co., Ltd., established in 1958, and the Jingjiang Stainless Steel Pump Valve Factory of the Iron and Steel Research Institute of the Ministry of Metallurgical Industry. It primarily produces API610 chemical process pumps—OH1, OH2, OH3, OH4 pumps, BB1–BB5 multistage pumps, VS1–VS6 barrel pumps, HES chemical process pumps, sixth-generation ultra-low carbon stainless steel high-quality leak-proof molten urea pumps, urea hydrolyzer feed pumps, pitot tube pumps, rotary jet pumps, molten salt pumps, submersible pumps, high-temperature magnetic drive pumps, magnetic pumps for conveying solid-containing media, canned motor pumps, slurry pumps, titanium tetrachloride pumps, self-priming pumps, lined fluorine pumps, leak-proof pumps, alkali pumps, axial flow pumps, long-shaft submersible pumps, and CQC Class I energy efficiency pumps. www.jslgpump.com Tel: 13905263417 E-mail: jslgpump@gmail.com E-mail: jsareva@163.com