supply ac brushless servo motor, dc

Stepper Drive Modes

This chapter has explained how to operate steppers by energizing one or two winding pairs at a tiem, but tere are a number of different ways to drive a Nema 23 stepper motor, and this discussion touches on four of them:

* Full-step (one phase on) mode – Each control signal energizes on winding.

* Full-step (two phases on) mode – Each control signal energizes two windings.

* Half-step mode – Each control signal alternates between energizing one and two windings.

* Microstep mode – The controller delivers sinusoidal signals to the stepper’s windings.

Full-Step (One Phase On) Mode

The simplest way to control a stepper is to energize one winding at a time. This is the method discussed at the start of this chapter. Figure 4.15 shows what the signaling sequence looks lide when controlling a stepper motor drive in this mode.

With each control signal, the rotor truns to align itself with the energized winding. The rotor always turns through the stepper’s rated step angle. That is, if a PM motor is rated for 7.5, each control signal causes it to turn 7.5.

Full-Step (Two Phase On) Mode

In the full-step (two phase on) mode, the controller energizes two windings at once. This turns the rotor through the stepper’s rated angle, and the rotor always aligns itself between two windings. Figure 4.16 illustrates one rotation of a stepper motor driven in this mode.

Figure 4.17 shows what the corresponding drive sequence looks like.

The main advantage of this mode over full-step (one phase on) is that it improves the motor’s torque. Because two windings are always on, torque increases by approximately 30%-40%. The disadvantage is that the power supply has to provide twice as much current to turn the stepper.

Half-Step Mode

The half-step mode is like a combination of the two full-step modes. That is, the controller alternates between energizing one winding and two windings. Figure 4.18 depicts three rotations of a stepper in half-step mode.

Figure 4.19 illustrates a control signal for a stepper motor driven in half-step mode.

In this mode, the rotor aligns itself with windings (when one winding is energized) and between windings (when two windings are energized). This effectively reduces the motor’s step angle by half. That is, if the stepper’s step angle is 1.8, it will trun at 0.9 in half-step mode.

The disadvantage of this mode is that, when a single winding is energized, the rotor turns with approximately 20% less toruqe. This can be compenstated for by increasing the current.

Microstep Mode

The purpose of microstep mode is to have the stepper turn as smoothly as possible. This requires dividing the energizing pulse into potentially hundreds of control signals. Common numbers of division are 8,64,and 256. If the energizing pulse is divided into 256 signals, a 1.8 stepper will turn at 1.8/256=0.007 per control signal.

In this mode, the controller delivers current in a sinusoidal pattern. Successive windings receive a delayed version of this sinusoid. Figure 4.20 gives an idea of what this looks like.

Using this mode reduces torque by nearly 30%, but another disadvantage involes speed. As the width of a control signal decrease, the ability of the motor to respond also decrease. Therefore, if the controller delivers rapid pulses to the stepper in microstep mode, the motor may not turn in a reliable fashion.

Sychronous type AC Servo Motor

The stator consists of a cylindrical frame and a stator core. The stator core is located in the frame and an armature coil is wound around the stator core. The end of the coil is connected with a lead wire and current is provide from the lead wire. The rotor consists of a shaft and a permanent magnet and the permanent magnet is attached to the outside of the shaft. In a synchronous type AC Leadshine servo motor, the magnet is attached to a rotor and an armature coil is wound around the stator unlike the DC servo motor. Therefore, the supply of current is possible from the outside without a stator and a synchronous type AC servo motor is called a ”brushless servo motor” because of this structural characteristic. Because this structure makes it possible to cool down a stator core directly from the outside, it is possible to resist an increase in temeprature. Also, because a synchronous type AC servo motor does not have the limitation of maximum velocity due to recification spark, a good characteristic of torque in the high-speed range can be obtained. In additon, because this type of motor has no brush, it can be operated for a long time without maintenace.

Like a DC servo motor, this type of AC servo motor drive uses an optical encoder or a resolver as a detector of rotation velocity. Also, a ferrite magnet or a rate earth magnet is used for the magnet which is built into the rotor and plays the role of a field system.

In this type of AC Servo Motor, because an armature contribution is linearly proportional to torque. Stop is easy and dynamic brake wordks during emergency stop. However, because a permanent magnet is use, the structure is very complex and the detection of position of the rotor is needed. The current from the armature includes high frequency current and the high frequecy current is the source of toruqe ripple and vibration.

The Input/Outpout System – Discrete Devices

In the first module, you learned about the basic architecture and operation of the Allen-Bradley Micrologix 1000, including a brief introduction to its I/O system. This second module goes into more detail about the I/O system of the Micrologix 1000 Omron PLC. It includes four sections:

1. Types of input/output devices
2. Input interfaces
3. Output interfaces
4. System and I/O power distribution wiring

Types of Input/Output Devices

A MicroLogix 1000 PLC uses its input and output interfaces to connect with field input/output devices. To review, all input devices provide a signal to the PLC, and all output devices receive a signal from the PLC. All I/O devices, however, do not send and receive the same type of signal. There are two different types of I/O signals and two types of I/O devices that use them. The two types of I/O devices are discrete devices and analog devices.

At the end of this section, you will know:

• the difference between the two types of I/O devices
• which type works with the MicroLogix 1000

Discrete Devices

Discrete devices are input or output devices that provide or receive discrete digital signals. A discrete digital signal is one that can report only two states, such as ON/OFF or open/closed.

A limit switch is an example of a discrete input device because,1at any given time, it is either open or closed. It sends a discretePLdigital signal to a PLC. This signal can have one of only two values, 0 or 1, indicating that the device is either OFF or ON, respectively (see Figure 2-1).

A pilot light is an example of a discrete output device (see Figure 2-2). It can only be ON or OFF. A discrete output deviceOFFDiscrete0receives a discrete digital signal from a PLC telling it to be in either one state or the other. A discrete output can never be in a state in between ON and OFF.Figure 2-2. A pilot light receives a discrete signal from a PLC.

Next article we will continue introducing Analog Devices. The following products are some hot sale OMRON PLC on our store.

cp1e e20sdr a OMRON PLC, CP1E CPU AC 100-240V input, 24DI 16DO Relay, USB port, Original brand new

OMRON PLCCP1E series offers all functionality you need to control relatively simple applications, including outstanding positioning capability. All CP1E CPUs offer high-speed USB for quick programming. The “Easy Input Editor” software feature allows faster programming by using an intuitive ladder editor to create an organized application program. The CP1E series comes in two different types: CP1E-E is the most economical, while the CP1E-N has a built-in real-time clock, motion control capabilities, and a serial port to connect an HMI, barcode reader, or other serial device. Several optional units are available to increase the functionality. As the CP1E series shares the same architecture as the CP1L, CP1H, CJ, and CS series, programs are compatible for memory allocations and instructions.


★ New CP1E CPU Units now available.
-Lineup including CPU Units with built-in three ports: USB, RS-232C, RS-485.
-The depth of CPU Units with RS-232C connectors is reduced by 20 mm. (N30/40/60S(1))
★ Easy connection with computers using commercially available USB cables.
★ With E30/40/60(S), N30/40/60 or NA20 CPU Units, Add I/O, Analog I/O or Temperature Inputs by Connecting Expansion Units or Expansion I/O Units.
★ Input interrupts
★ Complete High-speed Counter Functionality.
★ Versatile pulse control for Transistor Output for N14/20/30/40/60 or NA20 CPU Units.
★ PWM Outputs for Transistor Output for N14/20/30/40/60([email protected]) or NA20 CPU Units.
★ Mounting Serial Option Boards or Ethernet Option Board to N30/40/60 or NA20 CPU Units.
★ Built-in analog I/O, two inputs and one output, for NA-type CPU Units.

CP1H-XA40DT-D PLC OMRON, CPU 24VDC, input 24 point transistor output 16 point Original brand new


Pulse output for 4 axes. Advanced power for high-precision positioning control
High-speed counters. Differential phases for 4 axes
Easily handles multi-axis control with a single unit
Eight interrupt inputs are built in. Faster processing of approximately 500 instructions speeds up the entire system
Serial communications. Two ports. Select option boards for either RS-232C or RS-485 communications
EtherNet communications, enabled by using an option board, two ports can be used as an EtherNet port to perform, EtherNet communications between the CP1H and a host computer
USB peripheral port
The structured text (ST) language, makes math operations even easier
LCD displays and settings, enabled using option board
Transistor output (sinking)

CJ1W-ID211 PLC OMRON I/O 16 input point 24VDC Original brand new


High-speed input models are available, meeting versatile applications.
ON Response Time: 15μs, OFF Response Time: 90μs
Use 24-VDC, 100-VAC, and 200-VAC models to connect to devices with different types of outputs.
The 24-VDC models can be connected to devices with either NPN or PNP outputs. There is no need to select the polarity. *1
A digital filter in the Unit can be set from 0 to 32 ms to reduce the influence of external noise.
Either a Fujitsu or MIL connector interface can be used. *2
Several models of Terminal Block Conversion Units are available, making it easy to connect to external devices.

How Does an AC motor work

AC motors are powered with alternating present and convert electrical power into mechanical power. You will find 3 kinds of alternating present motors with three-phases. AC induction motors probably the most generally utilized, for AC voltage, the voltage on which they run, is readily accessible at any outlet. All AC motors, regardless of their kind, are comprised of a stator, which produces the magnetic field, along with a rotor, that is produced to rotate by the magnetic field that’s induced in the present generated by the stator.

When selecting the proper stepper motor drive for the application you will find two important elements to bear in mind; the operating speed, or how quick the motor will turn as measured in RPMS, and also the beginning torque, or just how much force is required (if any) to begin the motor. By supplying these specifications to an skilled engineer, you are able to make sure you’ll obtain probably the most efficient and price effective AC motor for the application.

In contrast to toys and flashlights, most houses, offices, factories, as well as other buildings are not powered by small batteries: they are not supplied with DC present, but with alternating present (AC), which reverses its path about 50 occasions per second (having a frequency of 50 Hz). If you would like to run a motor out of your household AC electrical energy provide, rather than from a DC battery, you’ll need a various style of motor.

In an AC motor, there is a ring of electromagnets arranged about the outdoors (creating up the stator), that are developed to create a rotating magnetic field. Inside the stator, there is a strong metal axle, a loop of wire, a coil, a squirrel cage produced of metal bars and interconnections (just like the rotating cages individuals occasionally get to amuse pet mice), or some other freely rotating metal component that may conduct electrical energy. In contrast to inside a nema 17 stepper, exactly where you send energy towards the inner rotor, in an AC motor you send energy towards the outer coils that make up the stator. The coils are energized in pairs, in sequence, creating a magnetic field that rotates about the outdoors from the motor.

How does this rotating field make the motor move? Keep in mind that the rotor, suspended inside the magnetic field, is definitely an electrical conductor. The magnetic field is continuously altering (simply because it is rotating) so, based on the laws of electromagnetism (Faraday’s law, to become precise), the magnetic field produces (or induces, to make use of Faraday’s personal term) an electric present inside the rotor. When the conductor is really a ring or perhaps a wire, the present flows about it inside a loop. When the conductor is merely a strong piece of metal, eddy currents swirl about it rather. Either way, the induced present produces its personal magnetic field and, based on an additional law of electromagnetism (Lenz’s law) tries to quit what ever it’s that causes it’s the rotating magnetic field by rotating also. (You are able to believe from the rotor frantically attempting to ”catch up” using the rotating magnetic field in an work to get rid of the distinction in motion in between them.) Electromagnetic induction will be the important to why a motor like this spins and that is why it is known as an induction motor.

Inserting Parametric PLC Modules

A programmable logic controller (PLC) or programmable controller is a digital computer that is used to automatically regulate the industrial process. For example, comtrolling machinery on assembly lines of factor. This controller is designed to meet a range of industrial activities such as multiple inputs and output arrangements, extended temperature ranges, giving immunity to electrical noise, and providing resistance to vibration. The programs, designed to regulate the machine operation, are usually stored in a battery-backed or non-volatile memory. A PLC is an instance of a real time system becuase output results are needed to be produced in response to input conditions within a time-bound period; else, it will result in an unintended operation. Over the years, the functionality of PLC has evolvoed to accommodate sequential relay control, motion control, process control, distributed control systems, and networking. In PLC, microprocessor controlled interface is inbuilt and is designed to control or monitor some other I/O functions. Being an industrial computer control system, it always monitors the state of input devices and makes decisions on the basis of custom program for controlling the state of devices connected as outputs.


Inserting Parametric PLC Modules

AutoCAD Electrical can generate PLC I/O modules in different graphical styles through parametric generation technique on demand. These modules are generate by a database file and a library of symbol blocks. PLC I/O modules can be inserted as independent symbols. PLC modules behave like other schematic components. These modules are AutoCAD blocks containing attributes for connection points, tagging and so on.

The Insert PLC (Parametric) tool is used to insert a PLC module parametrically. To do so, choose the Insert PLC (PLarametric) button from the Insert Components panel of the Schematic tab; the PLC Parametric Selection dialog box will be displayed, as shown in Figure 10-1. Using this dialog box, you can select the PLC Module and its graphics that you want to insert in a drawing. The different options and areas in this dialog box are discussed next.

Manufacture Catalog Tree

The Manufacture Catalog tree, shown in Figure 10-2, displays a list of PLC modules. This list can be filtered by selecting the manufacturer, series, and type of PLC. The data displayed in the Manufacturer Catalog tree is stored in the ace_plc.mdb database file.

You can selet a PLC module from the Manufacturer Catalog tree. To do so, click on the + sign on the requried manfacturers module; PLC modules of the selected manafacturer will be displayed. Select the requried module from the module list; the detailed information of the selected module will be displayed at the lower part of the PLC Parametric Selection dialog box, as shown in Figure 10-3.

After specifying the required values in the I/O Point dialog box, choose the OK button from this dialog box; the I/O Address dialog box will be displayed, as shown in Figure 10-6. Using this dialog box, you can specify the address for the first I/O point. Fasttobuy offers different brands of PLC modules such as Siemens PLC, Omron PLC, Mitsubishi PLC, Delta PLC, SIEMENS PLC, Omron PLC, Fatek PLC, ect.

The values in the Quick picks drop-down list are based on the values that you have specified in the I/O Point dialog box in the Rack and SLOT edit boxes. Select the required value from the Quick picks drop-down list; the value will be displayed in the Beginning address edit box. Alternatively, enter a required value for the first I/0 address of a PLC module in the Beginning address edit box. Note that the other I/O points of a module will be incremented based on the value specified in the Beginning address edit box.

Choose the List button in the I/O Address dialog box; the Report Generator dialog box will be displayed. This dialog box display the information of the selected PLC module.

After specifying the required options in the I/O Address dialog box, choose the OK button in this dialog box; the selected PLC module will be inserted into the drawing.

The Structure of Hybrid Stepper Motor

Hybrid stepper motors provide excellent performance in areas of torque, speed, and step resolution. Typically, step angles for a hybrid stepper motor range from 200 to 400 steps per revolution. This type of CNC stepper motor provides a combination of the best features available on both the PM and VR types of stepper motors.

Figure 8.1 shows a simplified construction of a unipolar hybrid stepper motor.The rotor of this machine consists of two star-shaped milled steel pieces with three teeth on each. A cylindrical, axially magnetized PM is placed between the milledpieces making the end of each rotor either a north or a south pole. The teeth areoffset at the north and south ends as shown in Fig. 8.1. The stator has four poles, each of which has a center-tapped winding. Since all the windings have the commonconnection V+, only five wires, A, B, C, D, and V+, leave the motor. A winding is excited by sending current into the V+ wire and out one of the other wires. Thewindings are wound in the stator teeth in such a way so that the Closed Loop Stepper motor behaves in the following way:

If winding A or C is excited, pole 1 or pole 3 is energized as south.
If winding B or D is excited, pole 2 or pole 4 is energized as

Stepper motors are also classified with respect to the stator windings as being either bipolar or unipolar.Bipolar stepper motors have two windings with anopposing magnetizing effect in each pole, while unipolar stepper motors use only one winding per pole.

High Quality Hybrid Stepper Motor Recommend

Leadshine NEMA34 3 phase Hybrid Stepper motor Drive kits 863HBM80H-1000+HBS2206

leadshine-stepper-motorThe HBS series offers an alternative for applications requiring high performance and high reliability when the servo was the only choice, while it remains cost-effective. The system includes a 2-phase stepper motor combined with a fully digital, high performance drive and an internal encoder which is used to close the position, velocity and current loops in real time, just like servo systems. It combines the best of servo and stepper motor technologies, and delivers unique capabilities and enhancements over both, while at a fraction of the cost of a servo system.

Stepper based servo control
Direct 120 / 220 / 230 AC input, or DC to 100V
Closed position loop to eliminate loss of synchronization
No torque reservation
Load based output current for extra low motor heating
Smooth motor movement and low motor noise
Quick response and no hunting
No overshooting and almost zero settling time
High starting torque, high inertial loads
Capable of driving NEMA 23, 24, 34, and 42 easy servo motors (stepper motors with encoders)
Plug-and-play, no tuning for most of applications

2 Phase Encoder closed loop Stepper Motor+Drive Kit Engraving Machine

stepper-motor2HSS two phase hybrid stepper servo drive system integrated servo control technology into the digital step driver. It adopts typical tricyclic control method which include current loop,speed loop and position loop.This product has the advantage of both step and servo system, is a highly cost-effective motion control products.

Full closed loop

1.Accurate position and speed control can achieve the most strict request of the application.
2. High robustness’s servo control adapt to wide range change of inertial load and friction load.
3.The motor with 1000 CPR encoder,support vector closed loop control. Compare with traditional step motor, it solved the problem of lose step.

Low heat/high efficiency

1.Adjust the current according to actual load,the heat is much lower compare with traditional step motor.
2.The current is almost 0, and without heat under stop condition.
3.It save energy and can achieve nearly 100% torque output. Working smoothly and accurate.

About Fasttobuy:

Fasttobuy Co .,Ltd . was established with the vision of developing motion control product for the industry .Our company has accumulated several years of experience in this field , integrating research and development, manufacture and marketing. We are always striving to understand the needs of customers, and to develop further in this field.

Our main products are stepper motor drives, step motor, AC servo motor systems, DC brushes and brushless motors and drive systems, and intelligent step motors .we also provide complimentary mechanical products, such as motor couplings, gearboxes, and linear motions.

Sida 3 av 812345...Sista »