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A torque/speed curve plots the torque of a motor against the speed that it is going at. The relationship between the torque and the speed is critical to choosing the right motor for your application.
The most important point to consider is the relationship between the torque and the speed as the amount of torque available changes with a change in speed. A common mistake is to buy a motor based on its rated or holding torque (thinking this is perfect for your application) only to find that this torque is not available at the required speed.
Consider the torque/speed curve opposite for a typical stepper motor.
The ZD Series of Stepper Motor Controllers can be run using a range of external inputs, offers 25600 potential positions (on a standard 200 step stepper motor) and can be programmed to do virtually anything!
WHAT HAPPENS TO THE AVAILABLE TORQUE AS THE SPEED INCREASES CAN BE VERY DIFFERENT FROM MOTOR TO MOTOR
As you can see in the example above the torque at lower rpm is very high but as the speed builds within the motor, the torque begins to drop away. In many respects this can be seen as a resultant trade-
It is important to bear in mind that different motors will have unique torque speed curves and also that with stepper and bldc motors, the controller used will also directly affect the torque speed curve. The key to using torque/speed curves is therefore to understand the exact or minimum requirements that you need from a motor and therefore use the torque speed curve to make a much more accurate assessment of the motor and controller that you need.
THE IMPORTANCE OF THE STEPPER MOTOR DRIVER OR STEPPER MOTOR CONTROLLER WHEN USING A STEPPER MOTOR TORQUE SPEED CURVE
When viewing a stepper motor torque speed curve such as the one above it is common to see an explanation at the top of the diagram which will explain what controller was used in the measuring of that particular curve. Different stepper motor controllers can output different levels of power and it may be the case that the motor you are looking at could output more power if it was used with a higher powered stepper motor controller. Equally it is also important to bear in mind that a stepper motor controller set on full step will typically generate a higher torque than a stepper motor controller running a microstepping sequence so if you are thinking of utilising a microstepping programme then it is worth contacting us first to discuss.
The torque speed is a fundamental guide to what you can expect to get in terms of mechanical performance but it is important to understand the specific situation in which a torque speed curve was created in order to ensure it meets your expectations. If you have any questions at all about torque speed curves and how they might affect your choice of motor then please don’t hesitate to CONTACT US via online chat or telephone and we will be more than happy to help.
To browse our existing range of motors and controller please CLICK HERE. To find out more about how to choose the right motor for your project you can CLICK HERE. If you have any additional questions or issues that you would like to discuss you can do so by calling us on 0333 123 7130, using online chat (see bottom right of screen) or visiting the CONTACT PAGE.
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