Are there any companies in the forum using permanent magnet speed control?

Comparison between Permanent Magnet Speed Regulators and Frequency Converters I. Introduction to Permanent Magnet Speed Regulators: A permanent magnet speed control drive consists of a permanent magnet coupler to which a regulating mechanism is added. This regulator adjusts the relative position of the cylindrical permanent magnet rotor and the cylindrical conductor rotor along the axis, thereby changing the effective part of the coupling between these two rotors and thus altering the torque transmitted between them. This allows for repeatable, adjustable, and controllable output torque and speed, achieving the goal of speed control and energy savings. It has the following features: 1. The permanent magnet speed regulator has a speed control range of 0-98%; the applicable motor power range is 200kW to 2500kW, with a voltage range of over 3300kV. 2. The permanent magnet speed regulator separates the motor from the load, eliminating mechanical connection and isolating vibrations. 3. The permanent magnet speed regulator is easy to install, tolerates large alignment errors, and requires little space. 4. Permanent-magnet speed regulators can operate in various harsh environments, including those with large voltage fluctuations in the power grid, severe harmonics, flammable and explosive conditions, high humidity, and dust. 5. The permanent magnet speed regulator can extend the service life of the main components of the transmission system (bearings, seals, etc.) and reduce maintenance costs. 6. The permanent magnet speed regulator is environmentally friendly, free of harmonics, pollutants, and EMI (electromagnetic wave) interference issues. 7. The permanent magnet speed regulator has a long service life, up to 30 years. 8. For permanent magnet speed regulators with a motor power of less than 315 kW, these regulators have a simple and reliable structure; their main components are mechanical in nature, they do not require an external power supply, maintenance needs are minimal, and their operating costs are low. 9. When the motor power is greater than 315 kW or the motor operates at low speeds, a water-cooled permanent magnet speed regulator is generally used. Such regulators require a clean water source, with strict requirements regarding both water quality and temperature ； Waterway design is complex, requiring a circulation system (tanks and pumps), a cooling system (heat exchangers), an external water-cooling system (pumps), a control system, and a feedback system; as a result, the system is complex with numerous potential failure points. Furthermore, the water cooling system of water-cooled permanent magnet speed regulators has relatively high operating costs and high maintenance costs. II. Energy-saving principle of permanent magnet speed regulators 1. The speed regulation characteristics of permanent magnet speed regulators are most suitable for the operating characteristics of centrifugal loads such as fans and water pumps ； 2. Using baffles and valves to regulate the flow rate of fans and water pumps can increase air resistance or water resistance, resulting in energy loss ； By adjusting the speed of fans and water pumps to change the flow rate, it is possible to avoid an increase in air resistance or water resistance, thus preventing energy loss ； 3. According to the similarity laws of fluid machinery, flow rate is proportional to the load speed, and power is proportional to the cube of the speed. During speed regulation, the output speed of the motor remains constant, but the output speed of the permanent magnet speed regulator changes. The output torque of the motor and the load torque decrease, so the output power of the motor (which is proportional to the product of torque M and speed n) also decreases, thereby achieving energy savings. III. Comparison between permanent magnet speed regulators and frequency converters. Permanent magnet speed regulators are currently used less frequently in China; in particular, there is virtually no use of them with high-power motors. On the other hand, frequency converters are widely used in China and have been accepted by a large number of users.

This depends on the actual conditions on site; there is no standard.