一体化步进电机驱动器反馈系统选型

现代社会分工日益细化。不论企业还是用户，只有专注于最擅长的工作才能使利益最大化。步进电机的用户多数不研究电机的控制和优化，而是将其应用于某个场合。基于这点，国外开始盛行一体化步进系统，即将步进电机、反馈装置、驱动放大器、运动控制器组合成一个整体。其优势为:体积小、故障率低、无需匹配电机和驱动控制器，使用简单，系统设计和维护方便，大大减少产品开发时间。

然而国外的一体化步进系统售价高昂，一般在200到1000美金一台/轴。鉴于国内实际情况，上海优爱宝公司从美国引进了一体化步进系统全面技术，以适合中国的价格为国内用户提供一体化步进电机驱动控制系统。其低端产品比国内同类售价略低，其高端产品国内尚无类似，其价格是国外产品的1/10。关键元器件全部由美国合作公司在美国本土采购。

针对目前步进电机用户选型一体化步进电机微型驱动控制器的一些疑问特撰文如下。

高管根据老板意思，作出详细工作计划通知手下的技工。技工根据高管的计划开机床完成生产任务。同时由于该机床(步进电机)质量很好，一般不出次品。但是为保证质量，可以增加质检人员(即反馈系统)，在发生质量问题时通知高管和老板以决定对策。老板不会开机床，也不懂生产，但是由于有高管和技工的帮助，老板照样能统领多个高管完成复杂的任务。高管+技工+机床就是一个一体化的步进电机系统，而用户则是老板。

以下对各子系统选型时的基本考量分别作简单介绍。

VIX步进电机驱动器

ViX微步进驱动器

功率单元具有全PWM控制使用正弦转换。用户可选择解角器或编码器反馈。标准RS-232界面，同时现场总线模块提供CANopen 和 RS-485通讯。Compumotor. ViX驱动器适合在高动态、多轴应用中使用，而不需要独立电源供给，在分布式控制中，它可作为一个独立的驱动器/控制器使用。

VIX Series

Small, Intelligent and Powerful Digital Servo/Stepper Drives and Drive/Controllers

With its all-digital, DC-powered design, the ViX family of awardwinning

drives and drive/controllers offers a new level of

economical servo performance. Available in both drive-only

and intelligent-drive/controller platforms, the ViX family gives

users a robust and cost-effective DC product, particularly in

multi-axis applications.

Designed for easy set-up and tuning, the ViX uses wizardsbased

software that enables users to implement a fully

configured system within minutes of unpacking the unit. Its

small size–just 4.9 x 1.65 x 3.35 inches–makes it ideal for

narrow applications and for direct-panel mounting, or for

attachment to a standard DIN rail using an optional adapter.

ViX General Features

· Up to 80VDC bus voltage

· Compact size: 4.9 x 1.65 x 3.35 inches

· Standard RS232C ASCII interface

· 5 digital inputs and 3 digital outputs (software configurable)

· CE (EMC & LVD), UL compliant

· Auto-correction of motor phase/feedback wiring (servo

only)

Servo-Specific Features

· Accepts analog (±10V), step/direction, CW/CCW signals

· Encoder following

· Current outputs of 2.5A RMS continuous and 5A RMS

continuous

· Resolver or encoder feedback

Stepper-Specific Features

· Integer selectable resolution from 200 to 51,200 steps/rev

· Anti-resonance circuitry suppresses mid-range instability

· Recommended motor inductance range of 0.5 mH to

20 mH

Servo and Stepper Optional

Controller-Specific Features

· Storage of up to 16 sequences

· Encoder following, registration, feed-rate override

· 5 digital inputs, 3 digital outputs, 1 analog input

· Conditional statements

· Optional RS485/CANbus interface

ViX Common Specifications

Drive Input Power

Voltage

ViX500 48-80VDC +5%, -15%

ViX250 24-80VDC +5%, -15%

Controller input power 24VDC, 250mA (no outputs loaded)

Drive Output Current Servo Stepper

ViX500 5A RMS continuous, 15A RMS peak* 8.0A pk (5.6 Arms)

ViX250 2.5A RMS continuous, 7.5A RMS peak* 4.0A pk (2.8 Arms)

Physical

Compumotor motors See table on page 3

Motor inductance range 0.5-10mH recommended (speed range reduced if >10mH)

Motor current limit Selectable by software

PWM/Motor ripple frequency 20 KHz/40 KHz

Protection Short-circuit, brownout, over-voltage, under-voltge, drive/motor over-

temperature I2t, feedback fault

Performance

Feedback device (servo only) Resolver or quadrature encoder (selected by software)

Resolver feedback (servo only) 12-bit A-to-D input (gives 4096 counts/rev), absolute

accuracy 30 arc-min

Encoder feedback 5V differential, 400 KHz max. input frequency (pre-quadrature),

resolution 1000, 1024, 2000 or 5000 lines

(i.e., up to 20,000 counts/rev). The H series has fully variable resolution and will support

up to 2.5 MHz

pre-quadrature encoder input.

Encoder supply 5V output for feedback and following encoder, 250mA maximum loading

Drive Command Inputs

(AE, AH models only)

Velocity and Torque modes ±10V differential, 12-bit resolution

Position mode Step/direction, step+/step- or quadrature encoder** input with resolution

equivalent to feedback device

Digital Inputs 5, of which 4 are configurable as Home, Limits and Registration. Operating

range 5V to 24V. Software

configurable 4K7 pull-up/active low or 4K7 pull-down/active high

Encoder following input Compatible with feedback resolution, max. input frequency

2.5MHz. Also configurable as step/direction

or step+/step- input

Outputs

Digital outputs 3 - 1 is configurable as Drive OK. Software-configurable active-low/sinking

(5V-24V) or active-high/

sourcing (24V only). 50mA maximum per output

Encoder output Fixed resolution (dependent on feedback device)

Fault output NPN open-collector output, normally low, active high

Analog output 10-bit filtered PWM monitor output, torque or velocity

Motor brake output 24V, 2A maximum, energized to release

Communication

Communication interface 9-pin D-shell (female) connector for RS232 (standard);

combined RS485 & CANopen option available

High-speed interface Dual RJ45 connectors for CANopen, RS485 option, etc., also

provide daisychain ports for multi-drop

RS232 connections

Diagnostics

LEDs 3 LEDs for feedback, drive and communication status

Environmental

Drive temperature range 32-122°F (0-50°C) local environment fan (fan cooling required

about 104°F (40°C)

Humidity 0-95% non-condensing