Reporter: Good morning, Mr. Chen. Today we’re here to talk about a professional topic related to permanent magnet motors—why is the dynamic balancing of the rotor done after adding the magnet blocks? Many people may not understand the logic behind this sequence.
Mr. Chen: Good morning. It’s a very important question because the order of this process directly affects the performance and service life of the motor. First, let’s briefly clarify what rotor dynamic balancing is. It’s a process to correct the mass imbalance of the rotor, ensuring that when the rotor rotates at high speed, the centrifugal force generated is uniform, avoiding excessive vibration and noise.
Reporter: So why can’t we do dynamic balancing first and then add the magnet blocks?
Mr. Chen: The key lies in the impact of addingmagnet blocks on the rotor’s mass distribution. Magnet blocks themselves have a certain weight, and during the installation process—whether it’s bonding or embedding—their position and installation accuracy will change the original mass distribution of the rotor. If we do dynamic balancing first, the balanced state is only for the “magnet-free rotor”. After adding the magnets, the rotor will become unbalanced again.
Reporter: That makes sense. Can you explain the specific hazards if the order is reversed?
Mr. Chen: Certainly. If the unbalanced rotor with magnets operates at high speed, it will produce large centrifugal force, leading to severe vibration of the motor. This not only affects the user’s experience but also accelerates the wear of bearings and other components, reducing the motor’s service life. In severe cases, it may even cause structural damage to the motor. For high-precision applications like new energy vehicles and industrial robots, unbalanced rotors can directly affect the stability of the entire equipment.
Reporter: So the core is to ensure that the final rotating part (rotor with magnets) is in a balanced state? Are there any special considerations in practical operations?
Mr. Chen: Exactly. The ultimate goal of dynamic balancing is to optimize the entire rotating assembly. In practice, we also need to consider the tolerance of magnet installation and the consistency of magnet weight. Even small differences in magnet weight or installation position can cause imbalance. Therefore, dynamic balancing after magnet installation is the only way to ensure the rotor’s balance accuracy.
Reporter: Thank you, Mr. Chen, for your detailed explanation. It helps us understand that the sequence of this process is determined by the need to ensure the rotor’s balance and the motor’s overall performance.
Mr. Chen: My pleasure. Understanding these basic principles is crucial for both industry practitioners and ordinary people who care about new energy technologies.
Post time: Jan-12-2026