Direct drive type Special permanent magnet motor direct drive for belt conveyor:

The special low-speed high-power permanent magnet drive system for belt conveyors is a high-efficiency and energy-saving direct-drive electric drive system, which directly drives the load equipment. Different from the traditional asynchronous motor, the selection of the system depends on the actual equipment speed range and the equipment load torque. The specific selection rules are as follows:

Determine the motor speed range according to the belt speed and roller outer diameter of the belt conveyor, to select the motor drive system whose speed range is not less than and closest to the actual demand. The standard rated speed is 0~60r/min, 0~75r/min, 0~90r/min, and other speed ranges can be adjusted and customized according to the actual requirements of customers.

Confirm the torque required by the belt conveyor first to select the appropriate permanent magnet drive system. The actual torque of the equipment can also be calculated according to the parameters of a traditional asynchronous motor and the speed ratio of the reducer.

Determine the rated voltage of the motor. The common voltage of the motor under the torque of 30000N.m is 380V, 660V, and 1140V. The motor voltage above the torque of 30000N.m is 1140V, 3300V, 6kV, and 10kV. Other voltage levels can be customized according to customer needs.

The motor cooling mode includes natural cooling, forced air cooling, and water cooling, which can be selected according to the customer's actual needs.

The motors can be designed and manufactured according to the technical parameters provided by users.

If the motor parameters are clear, they can be selected according to this Catalog Parameter List.

Special low-speed big power permanent magnet drive system for belt conveyor:

The special drive system is customized according to the operation characteristics of the belt conveyor. With advanced design concept and production processing technology and equipment, the low-speed high-power permanent magnet motor drive system has formed 315, 355, 400, 500, and 560 five Frame sizes, with torque ranges 3000 N · m ~ 100000 N · m, a series products of more than 120 specifications, widely applied in the port, mining machinery and other fields.

The products adopt the latest electromagnetic program and structural design, with characteristics of energy-saving, efficiency, small size, lightweight, high torque density, anti-demagnetization, easy installation, maintenance-free, and high cost-performance ratio. The products are suitable for a variety of low-speed high-power belt transmission equipment.

Cases for reference:(PM motor for belt conveyor)

Belt conveyors are widely used in raw material transportation in various industries. The traditional driving method adopts the form of asynchronous motor acceleration and deceleration machines. Due to the deceleration and soft start equipment such as reducer and hydraulic coupler, there are the following disadvantages:
1. Low drive system efficiency
2. The drive system is complex, with many fault points and low reliability
3. The daily maintenance time is long
4. The drive system is noisy and vibrating
5. Mechanical soft start, which has a great impact on the power grid

The permanent magnet motor direct drive is used to directly drive the load, eliminating the intermediate deceleration link, which has the following advantages:
1. The direct drive system has high efficiency, and the power saving rate reaches 10%~30%.
2. The permanent magnet synchronous machine has a large starting torque
3. Frequency conversion soft start has a small impact on the power grid
4. The system is simple and there are few failure points
5. Simple maintenance, low noise, and low vibration

Due to the use of a permanent magnet to provide a magnetic field, the rotor process is mature and reliable, its size is flexible, and its design power range from dozens of watts to megawatts. At the same time, by increasing or decreasing the number of permanent magnets in the rotor, it is easier to change the number of poles of the motor, so that the speed range of the permanent magnet synchronous motor is comparatively wider. With the use of a multi-pole permanent magnet rotor, the rated speed can be as low as a single digit, which is difficult to achieve by ordinary asynchronous motor.

Especially in the application environment of low speed and high power, a permanent magnet synchronous motor can adopt multi-pole direct drive at low speed. Compared with an ordinary motor plus speed reducer, the advantages of a permanent magnet synchronous motor are prominent.

Direct drive type permanent magnet motor: due to the cancellation of the reducer, the motor output speed is lower, low mechanical noise, small mechanical vibration, and low failure rate, and the whole drive system are almost maintenance-free.

The special low-speed and high-power permanent magnet drive system adopts optimal design: the motor itself has a higher efficiency up to 93-97%, and a higher power factor up to 0.99, which increases the proportion of active power in the system. At the same time, the transmission efficiency of the whole equipment is higher than that of the high-speed motor + gearbox because no gearbox transmission is required.

For example, the average load rate of the motor in the whole running process from starting, running to stopping is about 40%, while the maximum load rate is less than 60%. Since the efficiency and power factor of the asynchronous motor is closely related to the load rate, when the load rate is lower than 50%, the efficiency and power factors drop sharply. The efficiency and power factors of permanent magnet motors are less affected by the load rate, and can still keep extremely high efficiency and power factor within the load rate of 20% ~ 120%.

Since conventional asynchronous motor starting torque, multiple and maximum torque multiple are limited, in order to meet the requirements of heavy load start, a larger capacity asynchronous motor needs to be chosen, usually, one or two grades of power amplification are required. During normal operation state, the motor is in light load operation, with relatively low efficiency and power factor.

The permanent magnet synchronous motor does not need additional excitation current because the rotor magnetic field exists all the time. The starting torque can be more than twice the rated torque, which can meet the load requirements of heavy load starting. The efficiency and power factors of permanent magnet motors are less affected by load and can keep extremely high efficiency and power factor within 20% ~ 120% of the load rate.