The permanent magnet synchronous motor and the built - in magnetic drum adopt a direct - drive structure or a built - in structure of a low - speed high - torque rare - earth permanent magnet synchronous motor. It has the advantages of high efficiency, high power factor, high torque, good speed - regulation performance, and high control accuracy.

The stator winding of the motor uses FCR corona - resistant polyimide film sintered flat copper wire. Compared with the electromagnetic wire and enameled wire of traditional processes, it has higher corona resistance and impulse voltage resistance, and high reliability, which can effectively ensure the insulation reliability of the motor. The stator winding of the motor should effectively ensure the insulation reliability of the motor. The stator winding of the permanent magnet synchronous motor has excellent corona resistance, insulation performance, and thermal conductivity. The stator winding has a low temperature rise, high mechanical strength, and significant effects in moisture - proof, anti - pollution, and anti - corrosion, and can operate stably for a long time under extremely harsh environmental conditions. The stator winding should have excellent moisture - proof, anti - pollution, and waterproof performance.

Requirements for motor bearings: Rolling bearings are used, and the bearings are products of the same - quality brands such as Harbin Bearing, Wafangdian Bearing, and Luoyang Bearing. Sealing requirements: V - type seals, skeleton seals, or labyrinth seals are used.

It is required to install 2 temperature - measuring elements Pt100 (three - wire system) for each phase of the motor, one for use and one for standby. The sensor elements are embedded in the stator slots and evenly distributed along the stator circumference. It is required to install a set of temperature and vibration sensors on each of the shaft - extension end bearing and the non - shaft - extension end bearing of the motor. The temperature - measuring and vibration elements of the stator and bearings are all passive contacts, so as to monitor the temperature and vibration of the stator winding and bearings in real - time.

It is required that the magnetic pole laminations and the motor shaft use high - quality silicon steel sheets no less than 50DW470 and high - quality alloy steel 42CrMo, and a flaw detection report of the motor shaft should be provided.

The motor needs to adopt a cooling method with water channels embedded in the casing and must be equipped with an independent air - water cooling device. The cooling pump station has two cooling forms: external discharge of cooling water and circulating cooling. It can withstand a maximum cooling water pressure of 3 Mpa. The design of the cooling water channels should be treated by pickling and passivation to ensure water quality and improve service life. A flow meter is required to be equipped to visually observe the flow data.

The air - water cooling device of the motor should ensure that under the normal continuous operation of the motor, the stator temperature does not exceed 135°C and the bearing temperature does not exceed 90°C.

A cooling water pipeline for the water - cooling device, a single - layer braided high - pressure rubber hose, should be provided as a supporting part. The joints at both ends of the hose are matched with the interfaces of the permanent magnet motor and the water - cooling device and are easy to disassemble and assemble.

A check valve should be installed inside the water - cooling device to prevent the backflow of cooling water.

It is required that the air - water cooling device includes a water pump motor and a fan motor, and the fan blades should be treated with anti - corrosion treatment.

Under the rated working conditions, the motor operates in the S9 duty cycle. The overload capacity is ≥ 2.2, and it can also meet the overload requirements applicable to the operation of the hoist: 120% long - term overload and 150% load for 30 seconds/3 minutes.

The motor should have excellent insulation corona resistance, good thermal conductivity, high mechanical strength, and good moisture - proof, anti - pollution, and waterproof performance. The temperature rise of the motor stator winding is not more than 60K.

Finite element optimization analysis is carried out on the motor to ensure that the cogging torque ripple value of the motor is less than 3% of the rated torque and to ensure the control performance of the motor.