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1. Motor life
The life of the entire motor depends on the life of the bearing. The motor housing adopts the IP54 protection level, which can be increased to IP65 under special circumstances to meet the requirements of most dust and humid environments. Under the condition that the shaft extension of the motor is installed with good axiality and the radial load of the rotating shaft is appropriate, the minimum service life of the motor bearing is more than 20,000 hours. The second is the service life of the cooling fan. The fan uses a single-phase 220V shaded pole motor, which has a longer service life than a capacitor-operated motor. During long-term operation in a dusty and humid environment, the viscous substances attached to the fan must be removed regularly to prevent the fan from burning due to excessive load.
2. Failure and protection of permanent magnet materials
The importance of permanent magnet materials to permanent magnet motors is self-evident, and its cost accounts for more than 1/4 of the entire motor material cost. Enterprise standards have been formulated for permanent magnet materials, which include corrosion resistance, consistency, high-temperature demagnetization test, linear demagnetization curve test, etc. The current permanent magnet materials have been able to run for a long time under the allowable temperature rise of the motor windings, and the demagnetization rate is within 2%. Conventional permanent magnet materials require the surface coating to withstand a salt spray test for more than 24 hours. For environments with more severe oxidation and corrosion, users need to contact the manufacturer to select permanent magnet materials with higher protection technology.
3. The coil burns out
The failure rate of traditional asynchronous motor coils is as high as 8%, which is mainly related to the thermal protection of the motor and the quality of electrical materials. The permanent magnet synchronous motor coil is embedded with a thermal element. When the temperature rise of the coil reaches the F grade insulation limit temperature rise of 105K, the driver uses the temperature signal collected by the thermal element to protect the motor from overheating to ensure the safe operation of the motor. At the same time, the motor stator adopts the vacuum dipping process twice greatly improving the qualification rate of the stator.
