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The operation form of the stepper motor The basic operation form of the stepper motor is called 'excitation form', which can make the stepper motor work in the full step form, half step form and micro step form, during which the micro step form can effectively reduce the step The noise of the phase current into the motor can improve the inherent noise and vibration problems of the stepper motor. The following three types of excitation will be introduced. The full-step form is called the full-step form, which is a fixed step angle operation based on the inherent structure of the motor. An electrical pulse The stepping motor travels a step angle. This step angle is determined by the motor planning structure, and it can be understood that the motor rotates at the maximum step angle.

The half-step form The half-step form is a step determined by the inherent structure of the motor Half of the angle of view performs step rotation. As shown in the figure below, the total number of poles of the stepper motor is 4 levels, and the corresponding step angle is 90 degrees. In the half-step form, each pulse of the step motor rotates 45 degrees. . Microstep form The microstep form is similar to the half-step form, with a smaller step angle, which is 1/4 step, 1/8 step, 1/16 step, which can reach a high degree of subdivision. Fan system The corresponding step perspective is at Step by step The distance angle is multiplied by the micro-step coefficient. The smaller the step angle of the stepper motor, the higher the processing accuracy required, and the larger the error of the step viewpoint at the corresponding microstep. The motor-driven driver stepper motor cannot be directly connected. To work on industrial frequency communication or DC power supply, it is necessary to use a dedicated stepper motor driver, which consists of a pulse generation control unit, a power drive unit, a maintenance unit, etc. As shown in the figure below. The drive unit is directly coupled to the stepper motor It can also be understood as the power interface of the stepper motor microcomputer controller.

The following will use the MCU and the separation device system as an example. The MCU is suitable for controlling the brain of the motor. It sends the step angle of the motor and the rolling direction to the discrete equipment. And the number of repetitions, and according to the signal announced by the MCU, discrete equipment will expand the voltage and current and send it to the motor, and then drive the motor to roll. As shown in the figure above, the system uses the MCU and motor to control the driver IC. From the input control Stepper motor controller IC can be divided into phase input type and clock input type. Phase input type refers to each excitation of the motor. The current direction of the phase is controlled by the input signal, and the clock input type means that the driving of the motor is controlled by the pulse signal. The phase input force type phase input force type motor driver requires two phases of control signals, A and B, only the clock signal and the control signal. MCUs do more transport operations. The control interface of the clock-in type clock-in type motor driver requires a clock signal (single pulse signal) input. Its control signal is relatively simple and the MCU occupies less resources. Motor drive safety skills are powered on Reset function (POR) The power-on reset function will monitor the power of the motor driver and the motor drive controller. To avoid motor operation problems, it will forcibly close the output signal until the power supply voltage remains stable. As shown in the figure below. Overcurrent detection function ( ISD) The over-current shutdown function will monitor the current of the output unit. If the current exceeds the specified value, the output will be forcibly closed. The function is to temporarily stop the IC output when a short circuit occurs. As shown below. Thermal Shutdown Function (TSD) The thermal shutdown function is to close the output when the temperature of the driver chip of the driver controlled by the motor exceeds the specified value, and maintain the condition until the temperature drops.

The data on the nameplate of the DC motor is an extra value, which is used as the basis for selecting and using the DC motor. 1. Type The type contains the motor series, frame number, core length, planning times, poles, etc. 2. Extra power (capacity) The idea of ​​direct current refers to the mechanical power allowed on the shaft during durable use. KW is usually used to imply a unit. 3. Extra voltage About DC power idea refers to the input voltage applied to the electric idea from both ends of the brush when operating under extra conditions. Units are implied by V. 4. Extra current About electric idea refers to the working current that is allowed to be input for durable work when extra power is output under extra voltage. Units are implied with A. 5. Extra speed When the motor works under extra working conditions (extra power, extra voltage, extra Fan system current), the rotor speed is extra speed. Units are indicated in r / min (revolutions / minute). DC motor nameplates often have low and high speeds. Low speed is the basic speed and high speed is the highest speed. 6.

Excitation method refers to the power supply method of the excitation winding. There are three types of self-excitation, self-excitation and re-excitation. 7. Excitation voltage refers to the voltage value of the power supplied by the excitation winding. Generally there are 110V, 220V and so on. The unit is V. 8.Excitation current Under the additional excitation voltage, the current cleared and circulated in the excitation winding is small. The unit is A. 9. Quota (working system)

This is the working method of the electric idea, which refers to the continuous time of the electric idea in normal use. Generally divided into continuous system (S1), intermittent system (S2-S10). 10. The level of end point refers to the heat resistance level of the end point data used in the manufacture of DC motors. Generally there are B grade F grade H grade C grade. 11. Extra temperature rise refers to the value of the allowable operating temperature of the motor reduced to the temperature of the winding when the motor is operating under additional operating conditions. The unit is implied by K. 12. Skill conditions ((standard number) national standards such as the type of small and medium-sized DC motors Z4-112 / 2-1 Z: DC idea 4: Fourth series planning 112: base height of the base, unit is mm 1: Code of armature core length.