8 results about "Ac machine" patented technology

An inductance measurement device (1) for measuring the inductance of a plurality of sets of multiphase AC machines (2) is provided with: a voltage application means (10) for applying a voltage to the plurality of sets of multiphase AC machines (2) by using one of a plurality of sets of windings as a self-measurement set and using a set of windings other than the self-measurement set as an interference measurement set; applying a measurement voltage based on the measurement voltage command value and not driving the multi-group multi-phase AC machine (2) to the self-measurement group; a voltage application means (20) that applies, to the interference measurement group, an interference measurement voltage that does not drive the multi-group multi-phase AC machine (2) on the basis of an interference measurement voltage command value for controlling the current of the interference measurement group to zero; and an inductance calculation means (30) for calculating the self-inductance of the self-test group and the mutual inductance from the self-test group to the interference measurement group on the basis of the current of the self-test group and the interference measurement voltage command value.

A method for controlling the tool face angle of a rotary steerable system inside a well. The tool face angle is mainly controlled through the determination of the duty cycle of an AC Machine, producing its torque. The controlling duty cycle of the AC Machine is determined through the summing of a duty cycle set point with one or more duty cycle corrective values, using a Pulse Width Modulation technique. The duty cycle corrective values use different cut-off frequencies and update frequencies to accommodate the non-linearity and asymmetry of the system response. The method can also be used for controlling the angular rate of the rotary steerable system.

The application relates to the technical field of computer-aided design and manufacturing, and provides a numerical control machining track post-processing calculation method and device and a storage medium, which are aimed at post-processing calculation of a support end track of a numerical control machining track of a whole box bottom hybrid parallel-serial mechanism mirror milling device, consider mechanical structures and rotary limiting ranges of a five-axis AC machining end and a virtual five-axis BA support end of the hybrid parallel-serial mechanism, and can realize the synchronism of the support end numerical control track; according to the requirement of angle calculation of existing five-axis program post-processing, the method is provided for incremental angle calculation by using a projection algorithm, the calculation efficiency and angle judgment accuracy can be effectively improved, and the program synchronism of the parallel mirror image device is ensured.

FPGA based Current controller for AC machine drives

The invention discloses a data center equipment racking method and system based on dynamic load balancing, and the method comprises the steps: S1, obtaining the resource information of cabinets, and determining the available space and available power of each cabinet; when the cabinet is an alternating current cabinet, the cabinet resource information further comprises a three-phase unbalance degree; s2, acquiring a required U bit and power of equipment to be loaded into a cabinet, and generating a candidate cabinet list meeting the loading requirement based on the cabinet resource information; s3, setting a first weight parameter and a second weight parameter for the direct current cabinet and the alternating current cabinet respectively, and performing comprehensive scoring on the candidate cabinet list according to a preset scoring weight; for the direct current cabinet, according to the available space and the available electric quantity, carrying out weighted summation by combining a preset first weight parameter; for the AC cabinet, according to the available space, the available electric quantity and the three-phase unbalance degree, performing weight summation by combining a preset second weight parameter; and S4, forming a descending recommendation sequence according to a weighted summation result, and recommending an optimal cabinet.

An AC electric machine (31) comprising: a stator (20) having a plurality of teeth (101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112) and a plurality of slots (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) distributed along a circumferential direction (X); a rotor (30) rotatable in opposition to the stator (20); a concentrated winding layout (100) comprising a plurality of coils (201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212) wound respectively on the plurality of teeth (101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112) and belonging to at least six phases (A1, A2, B1, B2, C1, C2), the coils being wound so that, when considering three adjacent coils, the middle coil is interposed between one coil wound in the same direction of the middle coil and another coil wound in the opposite direction of the middle coil, wherein the plurality of slots (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) comprises a first odd / even slots set (1, 3, 5, 7, 9, 11) and a second even / odd slots set (2, 4, 6, 8, 10, 12), each coil (201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212) in the first slots set (1, 3, 5, 7, 9, 11) being connected to an input conductor (401, 402, 403, 404, 405, 406) or to a neutral conductor (N1, N2) of one phase (A1, A2, B1, B2, C1, C2), each interconnection (301, 302, 303, 304, 305, 306) extending between two respective slots of the second slots set (2, 4, 6, 8, 10, 12).