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TYDP Series Direct Drive and Gearless Motor


Due to the use of a permanent magnet to provide a magnetic field, the rotor process is mature, reliable, the 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-poles permanent magnet rotor, the rated speed can be as low as a single digit, which is difficult to achieve by the ordinary asynchronous motor.

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


Due to the cancellation of the reducer, the motor output speed is low, low mechanical noise, small mechanical vibration, low failure rate, and the whole drive system is almost maintenance-free.



It causes vibration, heating, high failure rate, large consumption of lubricating oil, high cost of manual maintenance; it will cause certain shutdown loss.


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 stop 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 motor 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 multiples is 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 power amplification required. During normal operation state, the motor is in light load operation, with relatively low efficiency and power factor.


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 motor are less affected by load and can keep extremely high efficiency and power factor within 20% ~ 120% of load rate.