Intelligent Motion Systems Motion Detector Motor Selection and Interface, Selecting a Motor

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SECTION 2.3

Motor Selection and Interface

Selecting a Motor

When selecting a stepper motor for your application, there are several factors that need to be taken into consider- ation:

How will the motor be coupled to the load?

How much torque is required to move the load?

How fast does the load need to move or accelerate?

What degree of accuracy is required when positioning the load?

While determining the answers to these and other questions is beyond the scope of this document, they are details that you must know in order to select a motor that is appropriate for your application. These details will affect everything from the power supply voltage to the type and wiring configuration of your stepper motor. The current and microstepping settings of your Microstepping MForce PowerDrive will also be affected.

Types and Construction of Stepping Motors

The stepping motor, while classed as a DC motor, is actually an AC motor that is operated by trains of pulses. Although it is called a “stepping motor”, it is in reality a polyphase synchronous motor. This means it has multiple phases wound in the stator and the rotor is dragged along in synchronism with the rotating magnetic field. The MForce PowerDrive is designed to work with the following types of stepping motors:

1)Permanent Magnet (PM)

2)Hybrid Stepping Motors

Hybrid stepping motors combine the features of the PM stepping motors with the features of another type of stepping motor called a variable reluctance motor (VR). VR motors are low torque and load capacity motors which are typically used in instrumentation. The MForce PowerDrive cannot be used with VR motors as they have no permanent magnet.

On hybrid motors, the phases are wound on toothed segments of the stator assembly. The rotor consists of a permanent magnet with a toothed outer surface which allows precision motion accurate to within ± 3 percent. Hybrid stepping motors are available with step angles varying from 0.45° to 15° with 1.8° being the most com- monly used. Torque capacity in hybrid steppers ranges from 5 - 8000 ounce-inches. Because of their smaller step angles, hybrid motors have a higher degree of suitability in applications where precise load positioning and smooth motion is required.

Sizing a Motor for Your System

The MForce PowerDrive is a bipolar driver which works equally well with both bipolar and unipolar motors (i.e. 8 and 4 lead motors, and 6 lead center tapped motors).

To maintain a given set motor current, the MForce PowerDrive chops the voltage using a variable chopping fre- quency and a varying duty cycle. Duty cycles that exceed 50% can cause unstable chopping. This characteristic is directly related to the motor’s winding inductance. In order to avoid this situation, it is necessary to choose a motor with a low winding inductance. The lower the winding inductance, the higher the step rate possible.

Winding Inductance

Since the MForce PowerDrive is a constant current source, it is not necessary to use a motor that is rated at the same voltage as the supply voltage. What is important is that the MForce PowerDrive is set to the motor’s rated current.

The higher the voltage used the faster the current can flow through the motor windings. This in turn means a higher step rate, or motor speed. Care should be taken not to exceed the maximum voltage of the driver. There- fore, in choosing a motor for a system design, the best performance for a specified torque is a motor with the lowest possible winding inductance used in conjunction with highest possible driver voltage.

The winding inductance will determine the motor type and wiring configuration best suited for your system. While the equation used to size a motor for your system is quite simple, several factors fall into play at this point.

The winding inductance of a motor is rated in milliHenrys (mH) per Phase. The amount of inductance will depend on the wiring configuration of the motor.

Part 2: Interfacing and Configuring

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Contents Forcetm Microstepping MForce PowerDrive Product Manual Important information This page intentionally left blank Table Of Contents Appendices List of Figures List of Tables MForce PowerDrive Front Microstepping MForce PowerDriveStepping Motor Connect Opto Reference and Logic Inputs Connecting the MotorForcetm Intentionally Left Blank Configuring Introduction to the Microstepping MForce PowerDriveFeatures and Benefits General Specifications Microstepping MForce PowerDrive Detailed SpecificationsMechanical Specifications Dimensions in Inches mm Setup ParametersPin # Function Description Pin Assignment and DescriptionP4 Connector Motor P3 Connector DC Power, 2-Pin Locking Wire CrimpParameter Setup Cable and Adapters Options and AccessoriesPrototype Development Cable Intentionally Left Blank Forcetm Microstepping MForce PowerDrive Manual Revision R032008 Mounting Recommendations Mounting and Connection GuidelinesMounting Hole Pattern Securing Power Leads and Logic LeadsLayout and Interface Guidelines Logic and SPI Communications P1 Power P3Motor P4 Intentionally Left Blank Choosing a Power Supply for Your MForce PowerDrive Interfacing DC PowerIP804 Unregulated Linear Supply DC Power Supply RecommendationsISP300-7 Unregulated Switching Supply Recommended IMS Power SuppliesRecommended Power and Cable Configurations Basic DC Power ConnectionExample a DC Power Cabling Under 50 Feet Transformer 10 to 28 VAC RMS for 48 VDC Systems Types and Construction of Stepping Motors Motor Selection and InterfaceSelecting a Motor Winding InductanceRecommended IMS Motors Lead Stepping Motor Parallel ConfigurationFrame Enhanced 6.3A Frame Enhanced 2.4A Not Available with Double ShaftFrame Enhanced 3.0A Frame Enhanced 6.0ALead Motors Phase Connector PinPhase a Example a Motor Cabling Less Than 50 Feet MForce PowerDrive Phase OutputsRecommended Motor Cabling Motor ConnectionsRecommended Motor Cable AWG Sizes Example B Motor Cabling Greater Than 50 FeetMicrostepping MForce PowerDrive Manual Revision R032008 Logic Interface and Connection Isolated Logic Input Pins and ConnectionsIsolated Logic Input Characteristics Enable InputUp/Down Step ClockDirection QuadratureSTEP/DIRECTION Timing Optocoupler Reference Optocoupler ReferenceInput Connection Examples NPN Open Collector Interface SinkingSwitch Interface Example Switch Interface Sinking+V +12 to +48 Minimum Required ConnectionsConnecting SPI Communications Logic Level Shifting and Conditioning Circuit SPI Pins and Connections4 SPI Master with a Single Microstepping MForce PowerDrive SPI Master with Multiple Microstepping MForce PowerDriveConfiguration Parameters and Ranges Using the IMS SPI Motor Interface InstallationColor Coded Parameter Values File IMS SPI Motor Interface Menu OptionsView Recall UpgradeHelp Msel Microstep Resolution Selection Msel Microstep Resolution SelectExit Connected/Disconnected IndicatorFactory SetInput Clock Filter Screen 2 I/O Settings Configuration ScreenEnable Active High/Low Input Clock TypeIMS Part Number/Serial Number Screen Fault IndicationUpgrade Instructions IMS SPI Upgrader ScreenPort Menu Initialization ScreenPWM Mask Motor Settings Screen PWM Current ControlPWM Frequency Range Parameter Maximum PWM Duty Cycle % ParameterPWM Control Bits Example PWM Settings By Motor SpecificationsSPI Timing Notes Using User-Defined SPICheck Sum Calculation for SPI MSB SPI Commands and ParametersSPI Communications Sequence WriteIntentionally Left Blank Appendices Intentionally Left Blank Optional Prototype Development Cables MD-CC300-000 USB to SPI Parameter Setup CableAdapter Cables Installing the Cable/VCP Drivers Installation Procedure for the MD-CC300-000Figure A.5 Hardware Update Wizard Screen Determining the Virtual COM Port VCP Wire Color Code PD12-1434-FL3 Power, I/O and SPIPrototype Development Cable PD04-MF34-FL3 Prototype Development Cable PD02-2300-FL3Warranty Excellence in Motion

Motion Detector specifications

Intelligent Motion Systems (IMS) Motion Detector is a cutting-edge device designed for advanced motion detection and automation applications. This state-of-the-art technology plays a crucial role in enhancing security systems, managing smart homes, and facilitating industrial automation. With a focus on reliability, efficiency, and real-time responsiveness, the IMS Motion Detector brings numerous advantages to users.

One of the main features of the IMS Motion Detector is its high sensitivity and precision in capturing motion. Utilizing advanced infrared (IR) and microwave sensing technologies, the device can detect movement with remarkable accuracy, even in challenging environmental conditions. This dual-sensing approach allows for greater versatility, minimizing false alarms while ensuring reliable detection of genuine movement.

The IMS Motion Detector is designed with energy efficiency in mind. Employing low-power consumption technologies, it is ideal for long-term installations, reducing the need for frequent battery replacements or energy costs. Furthermore, the device offers customizable settings, enabling users to adjust sensitivity levels, detection range, and operational modes according to specific needs. This adaptability makes the IMS Motion Detector suitable for a variety of applications, from residential to commercial settings.

Another notable characteristic of the IMS Motion Detector is its seamless integration capabilities. It can be easily incorporated into existing security systems or smart home networks, allowing users to monitor and control their environments through user-friendly applications. Compatibility with popular home automation platforms further enhances its utility, enabling users to create automated scenarios, such as turning on lights or sending alerts to mobile devices upon detecting motion.

The device is built to withstand various environmental factors, featuring weather-resistant housing for outdoor use. Its robust construction ensures durability while maintaining optimal performance over an extended period.

In summary, the Intelligent Motion Systems Motion Detector is a sophisticated device that stands out for its advanced detection technologies, energy efficiency, customizable settings, and seamless integration capabilities. Whether used for enhancing security or automating daily routines, the IMS Motion Detector represents a significant innovation in the realm of motion detection and management. Perfect for both residential and commercial applications, it ensures users can monitor their environments with confidence and ease.
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