Find the stepper motor model, and the choice of driver IC

Recently, many customers have been inquiring about the replacement of THB6032, including customers in the textile industry, and it is said that the new product is preparing for mass production ......, The feedback information is that THB6032 will be out of stock in the future, and it is very likely that this chip will no longer be sold in the future. So look for alternatives. If you have netizens who are using THB6032, you can confirm with the purchase.

Regarding the THB6032, the prototype is a bare chip of Toshiba's TB67S109A, and two packages were selected, packaged in two models, THB6032S and THB6032MQ. So to replace, the first choice is: TB67S109AFT (QFN48), TB67S109AFNAG (HSSOP36) (package for high-current applications).

Although the function of the chip is the same, the package is different, so it is still necessary to modify the PCB circuit diagram.

Or choose TB5128 with better parameters to replace, up to 128 subdivision, withstand voltage 50V, peak current 5A, QFN48 package.

TB67S109A (same functional parameters as THB6032, but different closures).

Information about the TB5128 (better performance parameters than THB6032, QFN48 package).

There are many domestic manufacturers of stepper motors, such as Mingzhi, Fuxing, Baolong, Innex and other manufacturers, and the naming rules of Innex stepper motors are as follows:

57HS22-30 - 57 means that the mounting base of the motor is 57mm; hs represents two-phase stepper motor, 3s represents three-phase stepper motor; 22 means that the output static moment of the motor is; 30 means that the shaft length of the motor is 30mm.

When selecting a stepper drive system, there are the following steps:

1. Determine the output torque of the stepper motor according to the transmission structure, load size, operating status, etc., and the moment frequency curve of the stepper motor must be considered to make the stepper motor have enough output torque;

2. According to the size of the output torque and the installation structure, determine the model of the motor;

3. Select the appropriate stepper driver according to the motor model;

4. Choose the appropriate power supply system, the stepper drive system is generally low-voltage power supply;

It depends on your drive mode and requirements. And you have the love to play monolithic!

The ULN2003 is only a controllable power device with no other functions, and is no different from a discrete component. Now I'm ignoring factors such as its maximum operating voltage and maximum output current.

Let's take the drive two-phase stepper motor as an example:

1. There should be no problem with the bottom-driven cylinder driving the two-phase five-wire stepper motor. However, the stepper motor drive also needs to brake, half-flow brake and other functions, to have these functions, the program and internal operation of the single-chip microcomputer are complicated.

2. If the bridge drive mode is used to drive the two-phase four-wire stepper motor, the driving voltage of the upper bridge should be very high (VGS), and the output voltage of the single-chip microcomputer cannot open the upper bridge circuit.

4. The special chips for stepper motors are generally fully functional, and many of them also have limited current function (or constant current). Each motor only needs two input signals to drive: one for the step pulse and one for the forward and reverse signals. In this way, the program of the microcontroller is simple.

Stepper motors.

Classification: Copy-reactive stepper motor (

VR), permanent magnet BAI stepper motor (PM), hybrid stepper motor (HB) and single-phase WU stepper motor, etc.

The permanent magnet DAO stepper motor is generally two-phase, the torque and volume are small, and the stepping angle is generally 15 degrees or 15 degrees;

Reactive stepper motors are generally three-phase, which can achieve large torque output, and the stepping angle is generally degrees, but the noise and vibration are very large. The rotor magnetic circuit of the reactive stepper motor is made of soft magnetic material, and the stator has a multiphase excitation winding, which uses the change in magnetic conductance to generate torque.

Hybrid stepper motor refers to a mixture of the advantages of permanent magnet and reactive type. It is further divided into two phases and five phases: the two-phase stepping angle is generally degrees, while the five-phase stepping angle is generally degrees. This kind of stepper motor is the most widely used, and it is also the stepper motor selected for this subdivision drive scheme.

The inherent step angle of the motor, the number of phases of the stepper motor, torque, detent torque, etc.

Four-phase stepper motor line sequence identification.

Judgment: The resistance between a multimeter and the other four wires is basically equal, and it is a common wire.

Judgment of phase sequence: the public wire is connected to the positive voltage of the power supply, and the negative pole of the power supply touches the other four wires in turn, and can be stepped in one direction, which can be identified as A-B-C-D.

A stepper motor driver is an actuator that converts electrical impulses into angular displacements. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate at a fixed angle (called the "step angle") in a set direction, and its rotation is to run step by step at a fixed angle. 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 and positioning.

Hello, there are three types:

1. PM (permanent magnet) type, the stator is magnetized after the current is turned on the upper line and magnetizes to attract the rotor to determine the position of the rotor, which is actually a synchronous motor.

2. VR (variable reluctance) type, which is a motor with soft iron for the stator.

3. HB type is a hybrid motor of PM and VR.

Parameters of the stepper motor:

1. The inherent step angle of the motor: it represents the angle of rotation of the motor for each step pulse signal sent by the control system. The value of a step angle is given when the motor leaves the factory, such as the value given by the 86BYG250A motor is to indicate that the half-step work is the whole step work, this step angle can be called the 'inherent step angle of the motor', it is not necessarily the real step angle when the motor is actually working, the real step angle is related to the driver.

2. The number of phases of the stepper motor: refers to the number of coil groups inside the motor, and the commonly used ones are two-phase, three-phase, four-phase, and five-phase stepper motors. The number of phases of the motor is different, and its step angle is also different, generally the step angle of the two-phase motor is three-phase, and the five-phase is three.

In the absence of a subdivision driver, the user mainly relies on choosing a stepper motor with different phases to meet his step angle requirements. If you use a subdivision drive, the 'number of phases' becomes meaningless, and the user can change the step angle by simply changing the number of subdivisions on the drive.

3. Holdingtorque: refers to the torque of the stator locking the rotor when the stepper motor is energized but does not rotate. It is one of the most important parameters of a stepper motor, and usually the torque of the stepper motor at low speeds is close to the holding torque.

Since the output torque of the stepper motor continues to decay with the increase of speed, and the output power also changes with the increase of speed, maintaining torque has become one of the most important parameters to measure the stepper motor. For example, when people talk about a stepper motor, they mean a stepper motor that maintains torque unless otherwise specified.

4. Detenttorque: refers to the moment when the stator locks the rotor when the stepper motor is not energized. There is no unified translation method for detenttorque in China, which is easy to misunderstand; Since the rotor of a reactive stepper motor is not a permanent magnet material, it does not have a detenttorque.

A stepper motor is an actuator that converts electrical impulses into angular displacements. When the stepper driver receives a pulse signal, the stepper motor drives the stepper motor to rotate at a fixed angle (called "step angle") in the set direction, and the rotation of the stepper motor runs step by step at a fixed angle.

Inkjet printers mostly use this kind of stepper motor drive (X, Y axis):

There are two ways to drive it:

1. The bottom edge drive --- black and white wires are connected to the power supply (+12V), and the remaining four wires are grounded with switch tubes, and the timing pulse can be driven by entering the sequence pulse on the base (or control gate) of the four switch tubes. (e.g., driver chip SLA7076).

2. Two-phase drive--- black and white lines are not used in the air, (Zong, powder are one phase; Red and yellow are one phase, when the color line is wrong, the two wires that are connected with the multimeter R file are one phase), each phase adopts an H-bridge drive (that is, a double H-bridge drive. such as driver chip L297).

There is no separate description of the two drive circuits.