Question

Why is the torque-frequency characteristic of stepper motor a reference diagram? Why can the torque and input signal frequency diagram of the stepper motor only be used as a reference? Nema 17 stepper motor torque curve

Answer 1

The torque-frequency characteristic of the stepper motor is used as a reference graph mainly because the characteristic curve reveals the torque performance of the motor at different input signal frequencies.

This characteristic curve is an important reference for stepper motor design and application for the following reasons:

1. Precision control requirements: Stepper motors are often used in applications that require precise position control and motion control, such as robots, CNC machine tools, etc. The torque-frequency characteristic graph helps engineers understand the performance of the motor at different operating frequencies and select appropriate control parameters.

2. Explanation of the out-of-step phenomenon: As the input signal frequency increases, the torque of the stepper motor will decrease, which may cause out-of-step phenomenon. The torque-frequency characteristic graph can intuitively display this phenomenon and help engineers predict and avoid out-of-step.

3. Motor selection and optimization: During the selection process, the torque-frequency characteristic graph helps users select the appropriate stepper motor according to specific application requirements. At the same time, in the motor optimization design, this characteristic graph is also an important reference data.

4. Drive and control strategy formulation: According to the torque-frequency characteristic graph, appropriate drive and control strategies can be formulated to maximize the performance of the stepper motor and ensure the stability and reliability of the system.

Therefore, the torque and input signal frequency diagram of the stepper motor is used as a reference diagram, which is of great significance for the application, selection, optimization and formulation of drive and control strategies of the motor.

Answer 2

1. Different drives, different subdivisions and excitation methods will affect the output torque of the stepper motor, at the same time, the starting torque curve is also very related to the size of the moment of inertia of the load, so when referring to the distance frequency diagram, pay attention to confirm the test conditions of the distance frequency diagram.

2. The stepper motor also has a certain amplitude fluctuation within the specification value, for example, the general resistance value has a ±10% tolerance, the inductance has a ±20% tolerance, the results of the sample test and the actual use of the motor even if the same model produced by the same manufacturer has a certain difference, so there is enough margin when choosing a stepper motor.

Answer 3

The Load Characteristics Are Working Speed 300rpm, Torque 2nm, If You Choose A Working Speed Of 1200rpm, The Torque Output Of 0.5nm Stepper Motor Is Likely Not To Meet The Requirements, Although They Have The Same Power. 

The Former Should Consider The Use Of 60mm Series Stepper Motor, While The Latter Can Meet The Requirements With Only 56mm Series Stepper Motor. 

This Is Because The Range-frequency Characteristic Of Stepper Motors Is Not Linear In Relation To Speed And Torque.

The Stepper Motor With Matching The Parameters Of The Non-synchronous Progressive Motor Is Suitable For Different Speeds, The Stepper Motor With High Current And Low Inductance Is Suitable For Running High Speed, And The Stepper Motor With Low Current And High Inductance Is Suitable For Running Low Speed.

Another Important Reason Is That After The Driving Conditions Of The Same Stepper Motor Change, The Distance Frequency Characteristics Will Change Greatly, For Example: The Driving Voltage Is Increased From 24v To 48v, The Output Power Of The Stepper Motor Working At Low Speed Does Not Change Much, But The Output Power Will Increase A Lot At High Speed.