Halbach cylinders are applied to brushless ac servo motors. It is shown that a sinusoidal back-emf waveform and a low cogging torque can be achieved without recourse to conventional design features such as distributed windings and/or stator/rotor skew. A technique for imparting a multipole Halbach magnetization distribution on an ...

Partial Contents: AC Servo Motor 'MINAS' Series; Digital AC Servo Motor for Welding Robots; Low Noise Compact Inverter; Power-Brushless Circuit-Combination Type PPC Scanner Motor; Polygon Mirror Scanner Motors with Fluid Bearings; ...

Partial Contents: Ball Screw Nut Direct Driving AC Servo Motor; Ultralow Speed Servo System; Absolute System (Encoder and Driver); Economy-Type Low Noise Inverter DV-651 Series; Industrial Sewing Machine 'Pana-Servo AC' C Series; Circuit-Combination Type ...

Featuring low maintenance requirements and high durability, a direct-digital-controlled AC servo-motor drive system employing a synchronous motor with a permanent-magnetic rotor as well as an induction motor has been developed. This system attains flexibl...

In the 400 Hz AC systems the probe capacitance is the key factor in producing the necessary 90 degree phase shift for servo motor drive. ...

This paper proposes a speed servo system based on a space voltage vector modulation (SVM) inverter with the mixed voltage limitation method considering acceleration torque and voltage saturation for AC servo motor. The servo system realizes both a quick speed response and a small value of total ...

General-purpose inverters and servo drivers are used for many types of devices, including FA equipment, and the fields of application have been expanding significantly. On the other hand, reducing the motor acoustic noise is one of the major concerns in s...

Results of kinetic and kinematic analyses of the S4ER reflector drum are presented. Application of the resulting theoretical derivations serves as a guide both for design and final specification of components. The analyses include a mathematical description of the a-c servo motor and digital servo ...

... of step servo motor performance, demonstrates that stepper motor transient responses may be ... ANALOG SYSTEMS, TRANSIENTS, RESPONSE ...

"The Electric Motors Reference Center, from Machine Design, is designed to provide design engineers with the information they need to specify or purchase electric motors including: AC motors, DC motors, stepper motors and servo ...

... Title : Induction Motor Servos and Spindle Drives. ... The advantages of each, in both spindle and axis drive applications, are discussed. ...

... Title : Microprocessor Controlled DC Motor for Load Insensitive Position Servo System. ... is imposed on dc servo motor, this control system has the ...

... Accession Number : ADP011864. Title : The Servo Characteristics of Single-Phase Spindle Motor in DVD-ROM. Corporate ...

When the position error becomes small, in a conventional positioning system, its motor cannot obtain enough deceleration torque. Hence, the position response becomes slow. There is the other positioning system that is to design the position reference using a trapezoidal speed reference. When the load torque and the final goal position are known, this positioning system has a ...

The design, realization and testing of a servo drive with an asynchronous machine (an ac servo drive) were studied. The asynchronous machine is described by a mathematical model using space vectors. Based on this model, a digital field-oriented speed cont...

A performance investigation was made of a pneumatic servo motor combined with a 4-way servo valve. The air motor was performance tested as a unit and also in a motor-valve combination. An analysis was also made of the combinations. This pneumatic motor-valve ...

A contactless decentralized power supply is proposed with communication capability through only one transformer. A prototype of wireless transmission system of power and information (WTPI system) was built, and the two-axis position controls of servo motors were achieved by transferring the power and signal through one rotatable high-frequency transformer. ...

This paper presents a novel unipolar magnetic encoder and a new Vector control method of AC servo which can enable the feedback of the rotor position with high accuracy in high speed occasion. The signal generator of encoder consists of three pairs of semiconductor hall elements and a rotor of alnico magnet with one pair of poles. This encoder is featured ...

... If the misalignment is large, the ... by the sense of the misalignment and determines the direction of rotation of the servo motor. ...

... Descriptors : , (*ELECTRIC RELAYS, TRANSISTORS), (*SERVOMECHANISMS, ELECTRIC RELAYS), ELECTRIC MOTORS, DIRECT CURRENT ...

The speed servo system of an AC motor should always have a rapid and smooth response without current ripple. For this purpose, this paper proposes a new mixed modulation method of the PWM inverter by considering acceleration torque and voltage saturation. The rapid and robust speed servo system often has the high ...

In a conventional positioning system, when the position error becomes small, the motor cannot obtain enough deceleration torque. Hence, the position response becomes slow. In order to overcome this problem, this paper proposed a new high speed positioning system of an AC servo-motor considering unknown coulomb friction, inertia ...

FEM is well known as a powerful tool for the analysis of electromagnetic field in electromagnetic devices. MATLAB/Simulink is also well known as a very useful tool for the analysis and design of control systems. This paper proposes a new method, where the MATLAB/Simulink is coupled with FEM. We apply the proposed method to analyze the permanent magnet motor drive system, and ...

... overall gain. (Author). Descriptors : *Patent applications, *Speed regulators, Electric motors, Direct current. Subject Categories ...

... In the servo-disc motor, the ironless armature is constructed from several ... motor. Table ... into an electrical signal which can be evaluated. ...

... The spindle servo controls the disc angular velocity according to the position of the pick-up head so as to maintain CLV of the focusing spot on the ...

... motor control and more particularly to a motor control circuit which will cause a DC motor to run in much the same manner as a synchronous motor. ...

An automatic drilling system is disclosed which includes an electric servo motor operatively coupled to a winch brake control, a servo controller operatively coupled to the servo motor, and a drum position encoder rotationally coupled to a winch drum. The controller is adapted to operate the ...

The application of position servo synchronously tracking system constituted with PLC and general AC servo system in digitalization control intelligence can-body high-speed resistance welding machine is introduced in this paper. By studying the digitalization control system of automatic can-body resistance welding machine, technologic ...

Permanent magnet motors have been used in a wide variety of industrial applications. For the improvement of servo performances in the permanent magnet motors, a closed slot is adopted in the stator and a rare-earth magnet is used in the rotor. Here, the analysis of a permanent magnet type AC ...

The aim of this paper is to investigate the influence of magnetic fluids on the dynamic characteristics of a hydraulic servo-valve torque motor. As a kind of functional materials, magnetic fluids are filled into the working gaps of a hydraulic servo-valve torque motor in this paper. Forces on the torque ...

Abstract: Using the Handyboard or RCX platform and Integrated C programming language, students learn to control DC motors and servo motors. ...

Aug 2, 2007 ... Servo motors, rotary motors, and linear actuators for robotics. ... Photonics Superconductors and Magnetic Testing Facilities ...

In this paper, a novel concept of integrating an active torque balancing mechanism with a planetary gear reducer is presented. This integrated device is composed of a speed reduction unit and a torque compensation unit. The speed reduction unit, which contains a two-stage planetary gear train, can make the device to transform the speed and torque for meeting the needed requirements of the machine. ...

motor speed control, consider the use of alternating current (AC) variable frequency drive ... AC variable frequency systems for motor speed control offer ...

Power dissipation is ac induction motor is reduced by circuit that lowers applied voltage when motor

, and the armature current of the i-th motor, respectively. III. CONTOLLER DESIGN AND ANALYSIS Notice. Longchamp, Modeling and set point control of closed-chain mechanisms: theory and experiment, IEEE

. All measurement data were taken from a linear ironless motor drive, which is used in applications machines. The motor features low electrical and mechanical time constants and is fed by the Servo been accurately validated by measurements that have been carried out with an ironless linear motor

Early in 1993, a servo motor within one of three Fine Guidance Sensors (FGS) aboard the Hubble Space

... Figure 7. Isometric Drawing of Powder Lubricant Feeder ... required by the electronic systems, servo amplifiers ... motors, and the power system for the ...

... driven by a servo motor and controlled by a ... well with traditional Proportional and PID controllers in ... As expected, a type-0 control system has proven ...

Proprioceptive Control. Motor servoing, Pose maintenance, Gait .... Proprioception Layer. Tight feedback loops within the machine; No direct environmental ...

A valve system for controlling the flow of hydraulic fluid for opening and closing the main control valve for a turbine system is described. The valve system comprises: first valve means for passing hydraulic fluid to the servo motor to maintain the control valve open during normal operating conditions of the turbine and to interrupt the supply of ...

Nov 24, 2008 ... Real-time control is applied to an electric servo-motor to provide resistance and aerobic exercise in a lightweight, compact, ...

ACU replacement: New Siemens motors with new wiring had to be installed at the ... The new switchboard cabinet shows its new Siemens servo and Beckhoff ...

... 7his solenoid is controlled by a temperature sensing ... a servo motor driven Glan-Laser Polarizer assembly ... CW visible and near infrared lasers up to ...

... Descriptors : *Centrifuges, *Speed regulators, *Patent applications, Servomechanisms, Phase locked systems, Binary processors, Induction motors ...

ACU replacement: New Siemens motors with new wiring had to be installed at ... The new switchboard cabinet shows its new Siemens servo and Beckho Pro bus ...

A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one contactor and at least one switch ...

The objectives of this program for an improved ac motor controller for battery powered urban electric passenger vehicles were: the design, fabrication, test, evaluation and cost analysis of an engineering model controller for an ac induction motor drive s...

to the servo-motors used to actuate the rudder and the stern plane. The servo-motors command the rotation. A fairing with fixed surfaces is located in front of the rudder and the stern plane. Behind the three the vehicle is connected to the PC by its tether, the interface allows to directly act on the actuators (fins

The patent application relates to a speed control for a direct current motor. A reference frequency is provided to a programmable counter which provides an output divided by a predetermined number. The output from the programmable counter is one input to ...

Many algorithms using nonlinear control ideas have been applied to the induction motor control problem to allow the user to control the torque, speed, or position response of a closed loop servo quite precisely. For many applications, the incremental impr...

... FRACTUBE TOUGHNESS OF D6AC STEEL SHI LLELAGHI PJCKET MOTOR CASE ... The material recommended was D6AC steel. ...

... Adjustable Speed Drives (ASD), AC induction motors, AC synchronous motors, centrifugal pumps, and positive displacement pumps were ...

This book: outlines such new analytical tools as phase segregation and decaying-vector symmetrical component methods, explains new control methods for superior applications of AC motors, details practices that suppress and prevent occurrence of transient phenomena, provides techniques for improving control performance and quickening response, such as ...

An attempt was made to determine the factors causing the load-inertia compensation that has been observed in skeletal muscle. Cat skeletal muscle force output was determined as a function of the two variables, length and stimulus pulse rate. The results were represented in a system diagram from which it becomes apparent that: (a) the length-tension relationship in muscle forms a functional, ...

A variable frequency inverter is described for driving an ac induction motor which varies the frequency and voltage to the motor windings in response to varying torque requirements for the motor so that the applied voltage amplitude and frequency are of o...

This document describes a development program on the use of electroluminescent (EL) and photoconductive (PC) devices for analog computation. AC servo operation has been achieved, based in part on thin film deposited photoconductors. A module had been desi...

Partial Contents: Novel Technologies for Power Conversion Circuits; Large-Capacity, Variable-Speed AC Drive; Present Status and Prospects for General-Purpose Inverters and Servo Systems; Downsizing Technology for General-Purpose Inverters; Applications of...

Test data are presented and the design of a high-efficiency motor/generator controller at NASA-Lewis

... direct simulation of the 2-phase induction motor with and without space harmonics and simulation of a primitive synchronous motor and generator ...

test results of these motors. The hip motor is equipped with a 1:66 planetary gearbox (Faulhaber series 30/1) and both feet motors have a 1:14 planetary gearbox (Faulhaber series 30/1). The hip motor.5 was selected. This concept uses two gears. A small gear is mounted on an rc-servo ...

Phase locked loop (PLL) is a closed loop automatic control system, which can track the phase of input signal. It widely applies in each area of electronic technology. This paper research the phase locked loop in optical memory servo area. This paper introduces the configuration of digital phase locked loop (PLL) and phase locked servo system, the control ...

Commutators? a) Synchronous motor: Connect a solenoid to the screws on the base of a step- down transformer with the reversals in direction of the AC current, this is called a synchronous motor. b) Universal motor are AC, and from a synchronous AC ...

The GTC azimuth and elevation axes control systems employ large custom direct-drive motors operated by means of embedded fully-digital current loops. A high-performance position loop has been developed based on sinusoidal encoder feedback with interpolation error compensation. Real-time servo feedback and trajectory tracking is implemented by ...

This patent describes a summing pressure compensator control for hydraulic loads with at least one of the hydraulic loads being a variable displacement motor having servo means for controlling the displacement thereof, first hydraulic means responsive to the supply of fluid to the variable displacement motor to provide a first pressure ...

Electromagnetic torques of the permanent magnet (PM) synchronous servo motors have been theoretically and experimentally studied. A square wave motor that operates in conjunction with a power electronic converter has been developed. Particular attention is given to the effects of structural parameters on torques, which include the ...

The servo system of a PM motor is required to have a fine torque response and fine speed response. The current controller of the PM motor should have a fine current response. However, when the current sensors of the U phase and V phase have offset values, the servo system of the PM motor shows ...

These model repair specifications list the minimum requirements for repair and overhaul of polyphase AC squireel cage induction motors. All power ranges, voltages, and speeds of squirrel cage motors are covered.

A system is described for controlling the movement in azimuth and elevation of a large number of sun following solar energy collectors from a single central controller. The system utilizes servo signal generators, a modulator and a demodulator for transmitting the servo signals, and stepping motors for controlling remotely located ...

We describe a servo-controlled piston pump driven by a stepping motor. The analogue controller is a single non-linear second-order feedback loop with adjustable speed and acceleration limits. This system, designed to simulate slowly-moving, active and non-linear systems, can be used as a low (0-6.5 litre s-1) flow volume generator in calibration ...

A butterfly vane valve is described for the servo control of a gas or liquid flow. The valve is suitable for reactive species since nearly all wetted parts are Teflon. The valve is operated by a servo motor that is controlled by a dedicated microprocessor programmed in BASIC. The valve offers many other desirable features, including ...

A special winding machine with high accuracy has just been developed and applied to the construction of HT-7U Tokamak. It is one of the critical facilities for R & D of HT-7U construction. The machine mainly consists of five parts, including a CICC pay-off spool, a four-roller correcting assembly, a four-roller forming/bending assembly, a continuous winding structure and a CNC control system ...

The development of 4D imaging, treatment planning and treatment delivery methods for radiation therapy require the use of a high-precision translation stage for testing and validation. These technologies may require spatial resolutions of 1 mm, and temporal resolutions of 2-30 Hz for CT imaging, electromagnetic tracking, and fluoroscopic imaging. A 1D programmable translation stage capable of ...

The single-phase DC motor has the low-cost advantage over 3-phase DC motor owing to its easy-assembling and high yield-rate, however, it has larger torque ripple and clogging torque. Single-phase DC motor is currently applied to low profit margin products...

An ac motor controller for an induction motor electric vehicle drive system was designed, fabricated, tested, evaluated, and cost analyzed. A vehicle performance analysis was done to establish the vehicle tractive effort-speed requirements. These requirem...

This book is divided into: technology of energy-efficient motors, selection and application of energy-efficient motors, efficiency labeling and verification, power factor, single-phase and synchronous motors, adjustable speed drives, and ac motor control and protection. (DLC)