Abstract: A machine motion control system includes a number of moving parts for securing test electronic devices, a machine and an axis control card mounted on the machine. The machine includes a number of servo modules and a number of sensing units. The servo modules drive and control the corresponding moving parts on the machine. Each sensing unit is electrically connected to a corresponding moving part; the sensing units are operable to sense and transmit location information of the moving parts and the machine. The axis control card is electrically connected to the moving parts, the machine, and the sensing units. The axis control card receives location information of each moving part and processes the location information to generate a corresponding command signal, and transmits the generated command signal to the servo modules to control and adjust the moving parts.

Abstract: In the multi-axis driver control method for transmitting a command from an external device to the drive-axis basis controller of the multi-axis driver to set operation and/or parameters of the drive-axis basis controller, the external device is connected to the multi-axis driver on a one-to-one basis, and the external interface is connected to the drive-axis basis controller via a multi-dropped connecting portion. The drive-axis basis controller determines whether the command is self-addressed or not and, if the command is self-addressed, the drive-axis basis controller executes the command and transmits response data corresponding to the command and a transmission permission flag to the multi-dropped connecting portion. The multi-dropped connecting portion opens a transmission port in response to the transmission permission flag and transmits the response data to the external device, and after transmission is finished, the multi-dropped connecting portion closes the transmission port.

Abstract: This invention provides a motor drive circuit, which makes it possible to prevent braking when a power supply voltage is lower than a predetermined voltage while suppressing at a low cost a rise in a voltage on a power supply line when a kickback occurs. The motor drive circuit is formed to include first and second power supply lines connected with and shunted from a power supply, an H-bridge circuit, and a means to control the H-bridge circuit. The means controls the H-bridge circuit so that a regeneration path is not created in the H-bridge circuit when the power supply voltage is lower than a predetermined voltage.

Abstract: A piezoelectric oscillator that generates a travelling wave using two B (1, n) mode (n is a natural number) standing waves that are out of phase with each other by 90°. On a lower surface of an oscillating body, (4/3)n piezoelectric elements are provided in order to generate an n-wave travelling wave by combining the two B (1, n) mode standing waves that are out of phase with each other by 90°. When a wavelength of the travelling wave is given by ?, each of the piezoelectric elements has a dimension in a circumferential direction occupying a central angle corresponding to (1/2)??, and a plurality of piezoelectric elements are spaced apart from each other at intervals each occupies a central angle corresponding to (1/4)??.

Abstract: An electronic protection system for motors is provided that includes electric current (SC1-n) sensor elements, more specifically Hall positioning sensors, and electronic circuits for electric tension reading. The signals are processed by a central processor (2) that executes a set of rules (A, B, C) and makes inferences based on the collected data in order to protect the motor (M, M?) against possible failure. Furthermore, a method to protect motors (M, M?) is provided, based on a set of rules (A, B, C) in order to characterize failures and trends of possible failures, so that the motor does not operate out of its specification for the system to deactivate it.

Abstract: The invention relates to a method for determining the position of a rotor flux vector of an electric motor (M), comprising a step of injecting a first current vector into a first reference frame (x+, y+) rotating at a first frequency (?) relative to a reference frame (d, q) synchronous with the rotation of the motor, and a second current vector into a second injection reference frame (x?, y?) rotating at a second frequency opposite to the first frequency, a step of determining a first stator flux induced voltage delivered at the output of a first integrator module (12) synchronous with the first reference frame (x+, y+) and a second stator voltage delivered at the output of a second integrator module (13) synchronous with the second reference frame (x?, y?), a step of regulating the position of the rotor flux vector by minimizing the error (?) between a real position and an estimated position (?S) of the rotor flux vector, the error being determined based on the second induced voltage.

Abstract: To obtain an inexpensive piezoelectric vibration component having vibration characteristics whose degradation resulting from deposition of moisture due to a temperature change is less likely to occur without increasing the cost of a sealing structure and the number of parts, a piezoelectric vibration component includes a piezoelectric vibrating element accommodated in a package being sealed, and when the volume of the piezoelectric vibrating element is Ve and the volume within the package obtained by subtraction of the volume Ve of the piezoelectric vibrator from the volume of the space of the package is Vp Ve/Vp>(Se×M)/{(Sp+Se)×2.72} where Se is the surface area of the piezoelectric vibrating element, Sp is the surface area of the space inside the package when the piezoelectric vibrating element inside the package is absent, and M is the maximum mass of moisture per unit volume [?g/mm3] at the use temperature and 100% relative humidity.

Abstract: A system for maintaining thermal stability of a motion stage driven by a motor comprises a motion current generator operative to produce a motion current to drive the motion stage to move and a thermal current generator operative to produce a thermal current to dissipate heat in the motion stage for controlling a temperature of the motion stage without producing corresponding movement of the motion stage. A summation controller is operative to combine the motion current with the thermal current, and to produce a combined current output to the motor.

Abstract: A method for determining the position of a rotor in a permanent magnet synchronous motor includes applying voltage pulses to the windings at successive electrical angles while the motor is at a standstill. The resultant current is sampled. The position of a maximum current is determined by identifying an segment of an electrical cycles which includes the maximum current, and using a spline interpolation to model the current flow in this segment. The maximum current is then correlated to the position of the rotor.

Abstract: A rechargeable power tool includes a direct current motor, a switching circuit, at least one speed setting unit, a duty ratio setting unit, a drive unit, an operation amount detecting unit, an abnormality determining unit, and a determination threshold setting unit. The abnormality determining unit compares an operation amount detected by the operation amount detecting unit and a determination threshold set based on the operation amount to thereby determine whether or not an operation state of the rechargeable power tool is abnormal. The determination threshold setting unit sets the determination threshold in a continuous or stepwise manner in accordance with a rotation speed set by the speed setting unit.

Abstract: An inverter apparatus according to the invention includes a heat sink, an inverter that includes a semiconductor device and that is attached to the heat sink, detectors that detect the temperature of the inverter, an estimator that calculates estimated values of the thermal resistance and the thermal capacity of the heat sink on the basis of the temperature detected by the detectors, and a controller that controls driving of the inverter on the basis of the estimated values.

Abstract: A variable-frequency drive that includes a DC power supply bus with a positive line and a negative line, and an inverter module powered by the DC bus for supplying a variable voltage to an electric load. The inverter includes a first DC/DC converter including output terminals connected in series on the positive line of the DC bus, a second DC/DC converter including input terminals connected between the positive line and the negative line of the DC bus, a filtering capacitor connected in parallel to the input terminals of the first converter and to the first output terminals of the second converter, and an electric power storage module connected in parallel to the second output terminals of the second converter.

Abstract: A manipulator, in particular a small robot, has at least two motor mutually movable limbs with a motion axis of both limbs being acted on by an axle drive that has an external rotor motor, a position transmitter and a transmission. The transmission has at least one planetary gear set with a center gear and at least one planet meshing with it that also meshes with a ring gear and is mounted on a planet carrier. One of both limbs of the manipulators is torque proof connected with the ring gear and is mounted by this radial and/or axially, and the other is torque proof connected by both limbs of the manipulator with the planet carrier and is mounted by this radial and/or axially.

Abstract: Provided are an output filter and a power conversion apparatus having such an output filter. The output filter is configured by a neutral point detector with a reduced size and having no common mode inductance occurring by making inductances in coils of respective phases equal.

Abstract: An object is to provide a crystal device in which an influence due to an electroconductive adhesive is reduced, and vibration characteristics of a crystal piece are favorably maintained.

Abstract: A DC-motor (46) actuates a highly-reduced reduction gear of an actuating drive for a flap or valve in order to regulate a gas or liquid volume flow, particularly for heating/ventilation/climatization, or fire or room protection. Current flow in the stator coils (A, B, C) is commutated in a program-controlled manner without integrated position sensors. Algorithms enable counting rotations of rotor (54) of the DC-motor (46). Problems related to the principle of motor rotation speed at low rpm are prevented. The DC-motor (46) includes a stator (44) having three stator coils (A, B, C) which extend over 3n stator poles (52), and an annular-shaped permanent magnet rotor (54) having 2m permanent magnet segments with alternating polarity (N, S), a coaxial cup-shaped external rotor (110) and a coaxial drive shaft (108), whereby n and m are whole multiplication factor numbers (1, 2, 3, 4) and are different from each other.

Abstract: An energy converter includes magnetic coils of N phases (N is an integer of 3 or more), and a PWM drive circuit for driving the magnetic coils of N phases, wherein the magnetic coil of each phase can be independently controlled by the PWM drive circuit.

Abstract: An electrical submersible pumping (ESP) system can include a pump located in a wellbore, a motor attached to the pump, a power source located at the surface, a cable electrically coupling the power source and the motor, and a current sensor. The ESP system can also include a controller communicating with the current sensor to calculate a voltage drop associated with the cable responsive to an impedance of the cable. The controller can also control a power source output voltage responsive to the calculated voltage drop. For example, the controller can adjust the power source output voltage to minimize a cable current while maintaining a minimum motor voltage. The controller can also control a motor shaft speed by changing a power source output voltage frequency to compensate for changing slip and adjust the power source output voltage to minimize the cable current while maintaining a minimum motor voltage.

Abstract: A sensorless motor control device includes a magnetic pole position estimating unit that does not use a sensor to detect a magnetic pole position of a motor having a salient rotor, and overlays a high-frequency current on the motor to estimate the magnetic pole position of the rotor of the motor; and a high-frequency current control unit for changing a magnitude of the high-frequency current based on a magnitude of one of a torque and a current of the motor.

Abstract: The adapting system for a resonant drive appliance includes a circuit for measuring the back EMF induced in the stator coil of the motor following turn-off of the appliance. The frequency of the back EMF signal is determined from the zero crossings of the EMF signal. The determined frequency is then compared with a running average of previous frequency determinations, and the drive frequency of the appliance is adjusted if the difference between the compared frequencies is greater than a threshold value, e.g. 1 Hz.