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Customers often see the stepper motor will be lost step, why is there such a situation? The following by Dongguan Peng Xin Electrical and mechanical equipment Co., Ltd. and we come together to discuss this problem.
First of all, we come to understand the meaning and classification of stepper motor;
Stepping motor is an open loop control element which transforms an electric pulse signal into angular displacement or linear displacement. In the case of non overloading, the motor speed, stop position depends only on the frequency of the pulse signal and the number of pulses. Without the influence of load change, when the stepper driver receives a pulse signal, it drives the stepper motor to rotate in a fixed direction, a fixed angle, called &ldquo, step angle ”. Its rotation is running step by step at a fixed angle, and the angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning. At the same time, the speed and acceleration of the motor can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation.
Stepper motor is divided into permanent magnet stepper motor, reaction stepping motor, hybrid stepping motor. The Japanese stepper motor is a hybrid stepping motor, mainly a two-phase hybrid stepping motor. Hybrid stepping motor combines the advantages of the reaction and permanent magnet, the stator winding, a multiphase rotor with permanent magnets, rotor and stator are provided with a plurality of teeth to improve the step precision. It is characterized by large output torque, good dynamic performance and small step angle, but the structure is complex and the cost is relatively high.
Hybrid stepping motor is the most widely used in the non-standard automation industry. So why do you use hybrid stepping motors instead of permanent magnet stepper motors and reactive stepping motors?. Hybrid stepping is the advantage of mixing permanent magnet and reaction. It is divided into two phase and five phase: two-phase step angle of 1.8 degrees while the general five phase step angle of 0.72 degrees, the hybrid stepping motor with phase (energized winding number) increases, the step angle and improve the accuracy of.
Then, what are the reasons for the hybrid stepper motor failure?
First, the voltage is unstable when running at high speed, so that the input current is not up to the rated current. Thus, the output torque is decreased, resulting in Miss step;
Second, the external resistance is too large;
Third, the speed setting is too high, resulting in torque is not enough.
Fourth, the temperature of the stepper motor is too high, resulting in demagnetization of the magnetic material of the motor, resulting in failure to step;
Fifth, speed rise or fall too fast, resulting in lost step;
Improvement methods:
Calculates the mechanism load, selects the big torque torque stepping motor;
The inertia is reduced, because the external position accuracy is not high, causes the unnecessary resistance;
It is suggested that the lift curve should be set at high speed. After, Dongguan Peng Xin mechanical and electrical professional engineers suggest that friends in the selection, as far as possible to choose a larger than the actual load stepper motor, speed is not set too high. If you have any difficulty in selecting the stepper motor, please feel free to contact us. We will provide you with the most suitable program.
