High Speed Small BLDC Motor for Robot Joint

The robot joint needs to use the drive motor, and the high speed brushless DC motor has fully met the requirements of robot joint characteristics. So, what are the characteristics of the robot joints for the brushless DC motor?
BLDC motor for robot joint

Starting torque inertia ratio of motor is large. In the case of driving load requires the robot's driving motor starting torque is large, small moment of inertia.
Quick responsiveness. The time from the acquisition of the instruction signal to the completion of the working state required by the instruction of the brushless DC motor should be short. The shorter the response time to the instruction signal, the higher the sensitivity of the motor system and the better the quick response performance. Generally, the size of the electromechanical time constant of the motor is used to illustrate the quick response performance of the motor.
Wide speed range. BLDC motor can be used in 1:100 ~ 10000 speed range.
The continuity and linearity of control characteristics. With the change of the control signal, the speed of brushless DC motor can change continuously, sometimes the speed and control signal is directly proportional or approximately proportional.
High speed BLDC motor with small size, small mass, fuselage length and axle diameter size is very short, which is one of the characteristics of brushless motor, suitable for the robot space installation position is small characteristic requirements.
Brushless DC motor can carry out very frequent forward and backward and acceleration and deceleration operation, withstand overload in a short time, can also run under harsh conditions.

According to statistics, high starting torque, large torque, low inertia ac brushed motor, brushless dc motor, stepper motor, DC servo motor have been widely used in industrial robots. Most industrial robots with a general load of less than 1000N (equivalent to 100 kg.f) adopt dc motor drive system. The joint driving motor used in robot joint mainly includes BLDC motor, stepper motor and DC servo motor. Stepper motor drive system is mostly applicable to the precision, speed requirements of small simple robot open loop system, brushless DC motor because of the use of commutation, no commutation spark, in the flammable and explosive environment has been widely used. The power range of robot joint drive motor is generally 0.01 ~ 10kW.

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