The working state of the stepper motor can be divided into three kinds of static, steady state and transition state. What are the differences between the three states? For details, follow the editor of Dalan Motors.
1. Static:
Static refers to the instantaneous locked state of the rotor, that is, a DC current (pulse frequency f = 0) is passed through the motor control winding, and the rotor is in a state where the locking is not understood. In this state, the motor winding phase current is the largest, and the winding is not replaced, so the motor emits uneven heat in the switching phase (not all). Fever is one of the most serious conditions.
2. Steady state:
(1) The stable synchronization state occurs when the frequency of the control pulse is constant. At this time, the rotor is rotating at a constant speed, which can also be considered as periodic fluctuations relative to the synchronous speed. This state can be divided into two types: limit (ie, continuous frequency) and non-limit.
(2) The maximum pulse frequency fmax of the motor output shaft under a certain load and the corresponding maximum speed nmax of the rotor are the limit synchronization state. In this state, the rotor actually rotates uniformly without wobbling. This state can only be achieved under certain startup procedures. When the pulse frequency is higher than fmax, the rotor is out of synchronization (ie, out of step).
(3) When the control frequency is less than fmax, the motor is in a non-limiting stable state. This state often includes stable sway of the rotor, which is particularly dangerous in the resonance frequency region.
3. Basic transition state:
(1) When the frequency changes from zero to start fq, the speed of the motor rotor accelerates from zero to start at the limit speed (usually the motion limit frequency is called the no-load maximum emotional frequency). Above this maximum mutation frequency fq (commonly referred to as starting frequency or sensitivity frequency) it is impossible for the motor to start without losing steps.
(2) When the control pulse is interrupted abruptly, the motor decelerates rapidly from the stable synchronous state to the parking lock. The frequency in this stable synchronous state is called the stable limit braking frequency fs. Above this frequency, it is impossible to apply a non-slip brake. Only by gradually reducing the frequency and then braking can the overshoot be guaranteed.
(3) The motor is reversed. When the alternating sequence of winding replacement is suddenly changed, the rotor changes from a stable synchronous turntable in one rotation direction to another stable synchronous state of the opposite special item. There is also a limit reversal frequency ft. Above this frequency, the rotor is out of step, that is, there is an error with the given program information.
Starting, braking and reversing can be achieved under various (non-zero) initial conditions (angle θ and speed η).
However, the initial conditions strongly affect the specific values ​​of fq, fs, and ft, and drag calculation is therefore difficult. Therefore, the initial conditions should be negative when studying the frequency characteristics of the motor, and the initial conditions of the hard-opening rate in the design program. Similarly, when selecting a motor, you should also understand the experimental conditions of these frequency characteristics in detail, as well as the status of data acquisition (including initial conditions).
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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