1195 results about "Motor Drive Unit" patented technology

A rotary sensor that outputs two analog signals, such as one sine wave and one cosine wave and has multiple periods within one period of the electrical angle of a motor is employed. The motor is energized at each position for a specified length of time upon its startup by using multiple electrical angles corresponding to the multiple candidate absolute angles obtained from the rotary sensor signal as the initial position of the motor, and the electrical angle at which the motor acceleration becomes maximum is determined as the absolute angle. While the motor drive is in operation, on the other hand, the phase difference Δθ between the phase of the motor at the counter electromotive voltage and the control phase is directly computed from the parameters of the motor, sensed current, voltage command and angle speed so as to correct the shifted position. A high-efficiency motor drive unit with improved maintainability of rotary sensor and improved accuracy of sensing the magnet pole position of a permanent magnet synchronous motor that accelerates and decelerates very quickly in a wide range of speed is realized.

An apparatus is provided for communicating over a network images captured by a digital camera, such as a digital camera without an on-board network interface. The apparatus includes a housing separate from the digital camera having a processing unit with memory for storage of images, a camera interface card received in a memory card slot of the digital camera, and a cable or wireless connection coupling the camera interface card to the processing unit for data communication. The apparatus emulates a memory card to the digital camera, such that the digital camera's electronics operate with the memory of the processing unit through the camera interface card, as if such memory was on a memory card located in slot of the digital camera. Images captured by the digital camera are transferred, via the camera interface card and cable, to memory of the processing unit, and the digital camera can access images stored in memory of the processing unit. The processing unit has a wireless data network interface and Ethernet communication interface, whereby captured images stored in memory of the processing unit are queued in real-time for network transfer, and subsequently transferred via one of the network communication interfaces, to a computer system, such as an web site or file server, at a network destination address configurable in the processing unit. Data may be inputted by the user before and/or after image capture for association with images prior to their network transfer. The housing for the processing unit may be shaped like a motor drive unit and attached to the bottom of the camera, or worn by the user of the camera in the form of a belt pack or backpack.

In a power drive unit having power modules (three-phase inverter circuits) connected to a control circuit board, bus bars extending from the power modules and a current sensor each installed near the bus bars and including a sensing element that detects currents outputted from the bus bars, there are provided a sensor board on which the sensing element is mounted, and lead pins each connecting the sensor board to the control circuit board and having a bowed shape whose one end is connected to the sensor board and other end once extends away from the circuit board and then turns back toward the circuit board. With this, the circuit board and current sensors can be connected through the lead pins without increasing the distance therebetween and stress produced in the lead pins can be alleviated, thereby enabling the unit to be minimized in size and utilized in a harsh service environment.

A system and method for determining the stator winding resistance of AC motors is provided. The system includes an AC motor drive having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, a pulse width modulation (PWM) converter having switches therein to control current flow and terminal voltages in the AC motor, and a control system connected to the PWM converter. The control system generates a command signal to cause the PWM converter to control an output of the AC motor drive corresponding to an input to the AC motor, selectively generates a modified command signal to cause the PWM converter to inject a DC signal into the output of the AC motor drive, and determines a stator winding resistance of the AC motor based on the DC signal of at least one of the voltage and current.

Systems and apparatus are provided for an inverter system for use in a vehicle. The inverter system comprises a six-phase motor having a first set of three-phase windings and a second set of three-phase windings and a three-phase motor having a third set of three-phase windings, wherein the third set of three-phase windings is coupled to the first set of three-phase windings and the second set of three-phase windings. The system further comprises a first energy source coupled to a first inverter adapted to drive the six-phase motor and the three-phase motor, wherein the first set of three-phase windings is coupled to the first inverter, and a second energy source coupled to a second inverter adapted to drive the six-phase motor and the three-phase motor, wherein the second set of three-phase windings is coupled to the second inverter. A controller is coupled to the first inverter and the second inverter.

The invention relates to a high-precision positioning rotational station, comprising a horizontal rotating platform, a vertical rotating platform, a horizontal driving motor, a vertical driving motor and a controller. The controller comprises a power supply unit, a data communication circuit, a control unit and a motor drive unit. The high-precision positioning rotational station is characterizedin that the control unit comprises a data processing unit, a real-time longitude and latitude memory, a positioning longitude and latitude memory and a comparator. Because of the arrangement of the real-time longitude and latitude memory, the positioning longitude and latitude memory and the comparator, a control center can send out final positioning longitude and latitude information of the horizontal rotating platform and the vertical rotating platform and can continuously send out the information for more than one time for improving the reliability, and the controller of the rotational platform can control the horizontal driving motor and the vertical driving motor to work after the comparison of the comparator to obtain a relative longitude and latitude position only by receiving the final positioning longitude and latitude once, thereby improving the measurement precision and the reliability of the high-precision positioning rotational station.

The switching rectifier and switching inverter on a motor drive unit are modulated to indirectly change the magnitude of current and voltage stored in DC link by controlling the magnetic field of the motor to correct for both power factor lead and power factor lag over a wide range of motor speeds and conditions while maintaining a predetermined motor operating point.

A motor drive unit comprises a DC power source, a plurality of inverter circuits for converting the a power of this DC power source to an AC power, current detectors for detecting an output current of at least one of those plurality of inverter circuits and a controller for performing PWM control of those plurality of inverter circuits. This controller is constructed in a way to synchronize a PWM period of the plurality of inverter circuits, so as to drive a plurality of motors at once by means of those plurality of inverter circuits respectively.

The invention relates to an automatically focused remote iris image acquisition device, an automatically focused remote iris image acquisition method and a recognition system. The device comprises an iris camera, a long-focus lens, a focusing drive unit, a lens converter, a focusing rotating machine, a motor drive unit and a computational processing unit; and the automatic focusing method based on the device comprises the following steps of: initializing focusing equipment; continuously acquiring iris images by the camera; computing the definition and definition change of the acquired images by the computational processing unit; determining the focusing speed and direction according to the current state and state transition condition of the system; and detecting clear eye images from the image sequence for iris recognition. Based on the focusing device and the focusing method, the range of depth of field and speed of acquiring remote iris images can be increased greatly. Furthermore, the remote iris image recognition system using the method and the device is more convenient and easy to use.

An in-wheel motor drive unit (21) comprises a casing (22), a motor part (A), a deceleration part (B), a wheel hub (31), and a wheel hub bearing (33) rotatably supporting the wheel hub (31) with respect to the casing (22). The wheel hub bearing (33) includes first and second outer track surfaces (33a) and (33b) provided on the inner diameter surface of the casing (22), a first inner track surface (33c) provided on the outer diameter surface of a wheel-side rotation member (30) and opposed to the first outer track surface (33a), a second inner track surface (33d) provided on the outer diameter surface of the wheel hub (31) and opposed to the second outer track surface (33b), and a plurality of rolling elements (33e) arranged between the outer track surfaces (33a) and (33b) and the inner track surfaces (33c) and (33d).

A DC motor is connected to diagonal positions of a bridge circuit having of four sides including switching elements and reflux diodes. At least one of two terminals is connected to a power line, and at least the other terminal is grounded. By performing pulse width modulation control of the switching elements, operation of the DC motor is controlled. When the DC motor is in operation, the sum of the terminal voltages of the DC motor is equal to the power voltage. When the DC motor is out of operation, the sum of the voltages is set to a predetermined voltage. If the sum of the voltages has deviated from the power voltage or the predetermined voltage by at least a predetermined value, the occurrence of a malfunction is judged.

An apparatus which selectively increases the size of the wake of a boat with an outboard or sterndrive motor system. The apparatus has one or more plates attached to the boat hull which, when rotated below the bottom of the hull, extend into the flow of water when underway, increasing the size of the wake due to the dynamic displacement of water. A support bar mechanism transmits propulsive force from the motor drive unit to the plates to overcome resistive hydraulic loads. Linkages may be used to locate the support bar mechanism. In one embodiment, the support bar mechanism is comprised of a plurality of members and pivots such that the support bar mechanism can be stowed substantially out of the flow of water until larger wakes are desired. In other embodiments, mechanical cable, fluidic, or electrical control systems are used to control the configuration of the support bar mechanism.

The invention relates to an electric power bicycle driving system capable of recognizing the state of a road. The electric power bicycle driving system comprises a brake control unit, a cadence sensing unit, a gradient sensing unit, a human-computer interaction interface, a logic control unit, a motor driving unit, a motor and a power rate regulating unit. The brake control unit, the cadence sensing unit and the gradient sensing unit are connected to the logic control unit respectively, the logic control unit is connected to the motor driving unit, the power rate regulating unit and the human-computer interaction interface respectively, the motor is simultaneously connected with the motor driving unit and the power rate regulating unit, and the power rate regulating unit is connected with the human-computer interaction interface at the same time. The logic control unit and the human-computer interaction interface mutually conduct feedback regulation, and the human-computer interaction interface and the power rate regulating unit mutually conduct feedback regulation. According to the electric power bicycle driving system, the power rate of the motor can be regulated by manually regulating a control button of the human-computer interaction interface, the gradient of the road can be also monitored at any time through the gradient sensing unit, the power rate of the motor can be increased or decreased according to uphill or downhill, and therefore a cyclist is always in a comfortable state.

A liquid level detection-type self-calibration high-precision water level gauge comprises a controller, a steel wire take-up pulley, a motor, a measurement driving wheel, a rotary encoder, a steel wire rope and a heavy hammer. A rotating shaft of the motor is connected with a rotating shaft of the steel wire take-up pulley; the steel wire take-up pulley is wound with one end of the steel wire rope, and the other end is connected with the heavy hammer through the measurement driving wheel; the rotary encoder is connected with a measurement driving wheel shaft; the controller includes a central processing unit which outputs a motor control signal to a motor driving unit to drive the motor to rotate; a zero position detection signal of a heavy hammer zero position detection unit, a water surface detection signal of the heavy hammer arriving at a water surface detection unit, and an encoding impulse signal of an encoder impulse detection unit are input to the central processing unit; and the data is processed by the central processing unit which also transfers the data to an external data processing unit. By adopting the active liquid level detection method and the zero position self-calibration method, the invention can prevent the heavy hammer from dropping into the water, and eliminate the accumulated error produced by the skidding of the steel wire rope and the impulse loss of the encoder, thereby ensuring high-precision and wide-range measurement of the water level.

The invention discloses a Hall phase sequence detecting method of a brushless direct-current motor, relating to the technical field of the brushless direct-current motor. Based on the operating principle of the brushless direct-current motor and the magnetic potential synthesis principle, the method adopts the magnetic potential of a fixed stator to position a rotor, and obtains the position of the rotor by reading a signal of a Hall position sensor, thus determining the relation of the magnetic potential of a stator and the position of the rotor. The invention also discloses a phase sequence detecting device of the brushless direct-current motor, comprising a computational processing module, a motor-driven module and a man-machine interface module, wherein the man-machine interface module comprises an input unit and an output display unit; a motor-driven unit is in a three-phase inverse bridge-type structure; and the calculated processing module is respectively connected with the motor-driven module, the input unit and the output display unit by signals. Compared with the prior art, the detecting device has the advantages that the structure is simple, the use is convenient, the cost is low and the like.

The invention relates to an in-situ micro-nano indentation/scratch test platform and a test method, and belongs to the field of electromechanical integrated precision scientific instruments. An X axis precision scratch unit and a Y axis large-stroke stick-slip drive scratch assembly are assembled at the tail of a base, a Z axis macro-movement adjusting mechanism is assembled at the middle of the base, a motor driving unit is assembled at the head of the base, a precision pressing driving and displacement signal detecting unit is installed on the Z axis macro-movement adjusting mechanism, and a precision three-axis force sensor used for detecting an indentation pressing force and a normal force and a tangential force of a scratch is installed on the X axis precision scratch unit. The in-situ micro-nano indentation/scratch test platform has the advantages of compact structure, miniaturization, integration, and capability of better ensuring the assembly precision, effectively improving the overall rigidity and dynamic properties and improving the overall test precision while overcoming the defect that an existing test platform cannot be used for quantitatively detecting the normal force and the tangential force in a scratch process.

A modular drive assembly for a sliding door, comprising: a guide track having a hinge slidably received therein; a pair of pulleys disposed on either end of the guide track; a pair of cables each having an end that is secured to the hinge and the other end is secured to a cable drum of a motor drive unit mounted to the guide track, the motor drive unit being configured to rotate the cable drum, wherein the cable drum is also capable of freely rotating within the motor drive unit when the motor drive unit is not rotating the cable drum, wherein rotation of the cable drum causes the hinge to move in the guide track as one of the cables wraps onto the cable drum while the other one of the cables wraps off of the cable drum.

A control mechanism for a hybrid vehicle having a motor driving means enabling its running through an output of an electric motor, and an engine driving means enabling its running through an output of an engine, includes a throttle sensor and a driving change-over control unit having a mode map for determining each of working regions M, E of the motor driving unit and the engine driving unit in response to a sensing signal θ of the throttle sensor. The mode map is provided with a critical region Ma adjacent to the working region E of the engine driving unit in the working region M of the motor driving unit and an informing unit (display device) to inform a driver of a fact that the motor driving unit is being operated in the critical region Ma. The display device also indicates a battery residual amount.

The invention discloses an MPPT photovoltaic inverter control system. A power inverter unit is connected to a solar cell panel, a main processing unit is connected to the power inverter unit, and the main processing unit is used for processing data through an MPPT algorithm and giving out a control instruction. A real-time clock chip unit and a signal real-time detection unit are connected to the main processing unit. An X-axis motor driving unit is connected between the main processing unit and an X-axis motor and is used for executing the control instruction of the main processing unit to drive the X-axis motor to rotate. A Y-axis motor driving unit is connected between the main processing unit and a Y-axis motor and is used for executing the control instruction of the main processing unit to drive the Y-axis motor to rotate. Tracking to the maximum power to photovoltaic solar energy of the control system achieves the purposes of real time, comprehensiveness, quickness and stability, so that the real-time application efficiency of the solar cell panel is improved, and the advantages such as high efficiency and energy saving are achieved.