Servo Motor Torque – An Overview

Motor torque refers to the rotational force of a motor that keeps it moving and operative. It is often referred to as the rotational equivalent of the linear force. In linear forces, the mechanism attached is push and pull. Similarly, for motor torque, the source of force remains the twist of a substance. The servo motor torque is a specialized form of torque that helps in gaining momentum for the motor and generates smooth and rapid rotation.  To know more about the salient features of the servo motor torque, look here

Special Features

  • The servo motor torque generates high response capacity which makes the motors efficient and high-performing in their peers. Speed control and accurate rotation angles are maintained through this variety of torque. 
  • The servo motors come specially equipped with the ability to respond and adjust to the external disturbances when combined with the servo amplifier feedback device, and error-correcting control loops.
  • Servo motors are efficient enough t generate torque for a range of speed. 
  • Servo motor can maintain a steady torque throughout the range of speed f the motor, unlike the stepper motors for which the torques starts dropping immediately after crossing the speed limits. 

Measuring the torque

The torque remains operative through two separate zones which are intermittent and continuous. Within the continuous zone, a combination of torque and speed is relentlessly produced by the motor. To judge if an application is a part of the continuous zone, RMS (root mean square) of the motor is used. Constant velocity, acceleration, dwell and deceleration are some of the parameters that are kept under consideration when measuring the same. The quantity of time involved in producing the torque required for a full duty cycle of a motor is also taken into account while calculating RMS.

Impact of Temperature

The servo motor torque functions depending on the ambient temperature as well. The higher the ambient temperature, the faster the motor reaches its thermal limits as well as the continuous torque rating.  Manufacturers of the servo motors always specify a higher limit for the temperature over which the performance of motor torque will vary. If the motor is operated amidst an ambient temperature that is greater than the specified limit, the servo motor curve will have to go under an adjustment. On the flip side, the ambient temperature is maintained below the specifications given by the manufacturer, the torque rating is likely to increase for the motor. 

Safety Measures

To keep the health of the motor fine, there exist certain conditions that are needed to be followed. When the motor is operating under the intermittent zone, the period of highest torque must remain within the time zone specified by the manufacturer of the motor and both the maximum speed and maximum torque should remain within the intermittent zone. If any of these two conditions get violated, the motor might incur substantial damage. 

Servo motor is an electrically run device and the torque it generates is substantial for multiple operations related to commercial use. 

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