CKD - Sưu tầm - Simplex Motion servo motor test run

[nhatson]

cái này là họ hàng gần của ac servo mà ah
nếu là Brushless dc thì nó ko êm bằng Brushless AC , và moment quay BLDC bị giảm tại điểm chuyển pha nhiều hơn loại BLAC

Motor:
The motor type that is used in the SimplexMotion range of integrated motor drives is a brushless DC motor with sinusoidal back EMF. This type of motor is often called ‘Permanent Magnet Synchronous Motor’, or PMSM for short, and is commonly used as servo motors. The SimplexMotion products utilize an outer rotor version of this motor type. This means that the motor has the stationary part (the stator) in the central position, while the rotating part (the rotor) is on the outside and encloses the stator. Since todays advanced materials allow the permanent magnets to be both very strong and small, it is possible to make the rotor thin and this allows the air gap between the stator core and the rotor magnets to have a large diameter. A large diameter of the air gap results in a high motor torque. The large volume inside the air gap allows a lot of copper in the windings, which minimizes conduction losses and allows the motor efficiency to be high.
But there are also drawbacks to an outer rotor motor. The larger diameter of the rotor increases the moment of inertia, which is especially harmful for fast dynamic positioning applications. But this effect is to a large degree compensated by the higher motor torque. Especially after considering the added moment of inertia of the application load the mechanical time constant (The ratio of torque to moment of inertia) is often advantageous for the outer rotor configuration.
Another drawback is the more difficult cooling of the motor windings. Having the windings in the center of the motor requires a more careful design of thermal issues. But by using both radiation, convection and conduction mechanisms for heat removal makes it possible to obtain a high ratio of power to weight of the final system. In the SimplexMotion concept there is also a thermal monitoring of the motor and the electronics to provide warnings or motor shutdown in case of over temperature.
The motors used are available from established manufacturers in many different sizes to allow rapid development of integrated motor drive products.

http://simplexmotion.com/technology/