1. Overview:

BH-2H042 driver driverTwo phase hybrid stepper motorThe driver is selected from the original imported model, which performs high-frequency chopping and constant current driving. It has strong anti-interference ability, good high-frequency characteristics, high starting frequency, photoelectric isolation between control signals and internal signals, current selection, simple and clear structure, stable operation, good reliability, and low noise. It can drive any 35BYG, 39 BYG, 42BYG, 57BYG series stepper motor within 1.7A.

Since its launch on the market, it has been widely loved by customers, especially in industries such as stage lighting, intelligence, instrumentation, POS machines, engraving machines, bill printers, industrial marking printers, semiconductor diffusion furnaces, etc.

BH-2H042 two-phase hybrid stepper motor driver features:

1.1 Driver wiring structure diagram.

1.2Chopping frequency f=30KHZ. 1.3 Select imported power electronic components from overseas.

The phase current of the motor is a sine wave.

1.5 The AC power for each phase of the larger driver is 1.7 amperes.

1.6 All input signals are optically isolated.

1.7 Select non overcurrent technology achievements.

1.8 fine points can be selected1/1，1/2，1/4，1/8，1/16,1/32,1/64,1/128.

2. Technical specifications

2.1Drive mode: constant current chopper.

2.2Net weight: 0.2kg.

2.3Power supply: AC 24V.

2.4Controller compatible with electric motors: 35BYG, 39BYG, 42BYG, 57BYG.

3. Detail score setting：

BH-2H042Two phase hybrid stepper motor driverIt is adjusted by using the dial switch on the controller to adjust the fine fraction, just follow the citation settings on the panel; Please use high granularity as much as possible when the controller frequency allows; Please refer to the following figure for specific setting methods:

Unplug settings:

4. Control signal input connection diagram：
Note:The input current on the input circuit is 5mA~20mA, usually using an input current of 15mA
The resistance of the external resistor (R) on the input circuit of the pulse signal (CP -) and direction signal (CW -) in Figure 1 is determined by the input voltage

4.1 Input signal parameters:
Pulse signal amplitude: 'H' -4.0~5.5V, 'L' -0~0.5V.
Pulse signal working state, i.e. duty cycle: 50% or below
Some users have raised concerns that my control system cannot drive the driver, mainly due to insufficient driving current or incorrect polarity. The commonly used correct driving circuit is shown in the following figure

5. Instructions for wiring terminals:

5.1 Electrical wiring: VDD: positive terminal of DC power supply (less than or equal to 24VDC).

GND: DC power ground wire (not shared with input signals CW -, CP -).

5.2 Motor wiring: A+and A - are connected to motor wire A phase, and B+and B - are connected to motor wire B phase.

5.3 Signal adjustment:.

CP+, CW+: The common positive terminal for input regulation signals.

CW -: Directional control signal input terminal (When this terminal is set to a low level, the motor immediately rotates in the opposite direction.).

CP -: Pulse signal input terminal (When CP is terminated, i.e. when the motor is locked, ensure that CP is at a high level to turn off the internal optocoupler. ）.

pourAdjust the signal input AC to 5mA~20mA, usually using an input AC of 15mA.

5.4 Indicator light: When powered on, the power indicator light is on, indicating that there is power.

6. Frequently Asked Questions and Answers：

6.1 How to change the direction of operation of the stepper motor that is opposite to what I have specified?

The direction signal of the control system can be changed, and the direction can also be switched according to the wiring of the motor, as follows:.

For motors with two phases and four wires, simply swap the motor wires of one phase and connect them to the driver, such as swapping A+and A -.

6.2 Electric motors have two phases, four phases, six wires, and eight wires, while drivers only need to connect four wires. How should they be used?

A four phase hybrid motor, also known as a two-phase hybrid motor, has multiple ways of connecting the winding leads. For a two-phase four wire motor, it can be immediately connected to the driver. For a four phase six wire motor, the two wires at the center tap are suspended and not connected, while the other four wires are connected to the driver. For a four phase eight wire motor, the winding leads are generally connected in parallel to the driver.

How to calculate the step angle of the segmented electric motor?

For two-phase and four phase motors, the segmented step angle is equivalent to dividing the entire step angle of the motor by the number of subdivisions. For example, if the subdivision number is set to 2 subdivisions of 0.9 degrees/1.8 degrees for a motor, the subdivision step angle is 1.8 degrees/2=0.9 degrees; If the subdivision score is set to 8, driving a 0.9 degree/1.8 degree motor, the subdivision step angle is 1.8/8=0.225 degrees.

6.4 The noise of the electric motor is very loud; And there is no force, the electric motor itself is vibrating?

When encountering this situation, since the stepper motor operates in the oscillation zone, usually changing the input signal frequency CP can solve this problem.

When the motor operates at low speed, there is no problem. However, when the frequency is slightly higher, there may be a problem of stalling?

This situation is often caused by insufficient power supply voltage applied to the driver; Increasing the input voltage slightly can solve this problem, but it should not exceed the maximum voltage marked on the power supply end of the driver; Otherwise, it may cause damage to the driver. For example, the original power supply voltage was 12V DC; now it could have been connected to 24V.

After connecting the driver to the power supply, the motor vibrates; Cannot run?

When encountering this situation, first check whether the winding of the motor and the connection of the driver are connected incorrectly; If there are no errors, check if the input frequency CP is too high; You can refer to 8.7. Introduction to the design of electric motor speed regulation to address this challenge; If it cannot be handled, it may be due to drive damage. Please contact our company!

6.7 Introduction to Lift Speed Design:.

The speed control of a stepper motor is changed by the transformation of the input pulse signal. In theory, only a pulse signal needs to be given to the driver. For every one pulse (CP) given to the driver, the stepper motor rotates by one step angle (1 subdivision step angle during subdivision). However, in fact, if the pulse CP signal changes too quickly, the stepper motor will not be able to follow the changes in the power signal due to inertia; At this time, it will cause stalling and step loss, so the stepper motor must have an acceleration process when starting; At the termination, there will be a necessary downshifting process, and usually the acceleration and deceleration rules are the same. The following is an example of acceleration: the acceleration process is composed of a sudden jump frequency and an acceleration curve (the deceleration process is the opposite). Sudden jump frequency refers to the pulse starting frequency suddenly applied to a stepper motor when it is in a stationary state. This frequency should not be too high, otherwise it will also cause stalling and step loss. The acceleration and deceleration curve is generally an exponential curve or a modified exponential curve, but of course, a straight line or sine curve can also be used. Customers need to select the appropriate jump frequency and acceleration/deceleration curve according to their own load. Finding an ideal curve is not easy and usually requires multiple iterations; Test machine # 39; That's enough. The exponential curve is more complicated in specific software programming, usually with a pre calculated time constant stored in computer memory and selected during the working process.

The setting of the lifting speed of the stepper motor is the specific task quantity of the control software, and its setting level will directly affect the smoothness of the motor operation, the speed of lifting, the sound of the motor operation, the maximum speed, and the positioning accuracy (our company's products will ensure a precision of 100% under appropriate use conditions). A special case is that the operating speed of the stepper motor does not exceed the jump frequency, and the lifting speed problem will not be found at this time.

7. Sales principle:

Bohong Electric adheres to the standard of 'customer first, reputation first', and cooperates with customers to resolve common problems in the application process of this product. Help customers make good use of our product and be willing to discuss the technical aspects of using the system device of this product for customers. This product comes with a 1-year warranty and lifetime maintenance.