The ball mill is the key equipment for crushing after the material is crushed. It is widely used in cement, non-ferrous metal beneficiation, and other production industries. The ball mill is a typical low-speed and large-torque load. At present, the traditional asynchronous machine + reducer is mainly used drive mode. Because the use of the reducer reduces the overall transmission efficiency of the system, increases the overall volume of the system, and greatly increases the maintenance cost.
The permanent magnet synchronous motor uses permanent magnet excitation, which does not require reactive excitation current and there is no rotor side. Therefore, the power factor and efficiency of the permanent magnet synchronous motor are significantly improved compared to the asynchronous motor. PMSM (speed-regulated permanent magnet synchronous motor) is driven by a frequency converter, and the speed is adjustable. The miner can adjust the frequency of the frequency converter to make the ball mill at different speeds. Carry out the operation test, and finally choose an optimal working point that has both good power consumption and low power consumption.
According to the operation of the traditional ball mill drive system, the design features and methods of the low-speed and large-torque permanent magnet synchronous motor are studied, and the permanent magnet motor is used. The towing test platform was tested, and the rationality of the design was further verified based on the test data. Finally, according to the comparison of the power consumption data of the traditional ball mill drive system and the permanent magnet motor drive system, it was concluded that the ball mill uses permanent magnet direct drive technology to save energy up to 20%. This conclusion proves the feasibility of applying the permanent magnet direct drive system to the ball mill.