13 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.

To provide a design method of an AC machine capable of uniquely determining a structure without depending on a designer with respect to a stator slot.SOLUTION: A design method of an AC machine comprises a first step of performing approximating an absolute value of a sine wave function changing in a circumferential direction in a magnetic pole period of stators in the AC machine by a pulse function having a pulse width corresponding to an absolute value of a sine wave function to determine an area where the pulse function becomes on-pulse in a winding arrangement area; a second step of arranging a plurality of fine cross-sectional windings at equal intervals in the determined winding arrangement area; a third step of enlarging a cross-sectional area of each winding to produce a winding aggregate by synthesizing windings closest to each other when windings adjacent to each other are overlapped, or when a ratio of a portion where a winding out of a length in a circumferential direction of the stators; and a fourth step of determining an arrangement position of each winding aggregate at a position of a slot for storing each winding aggregate thereof, when the number of the resulting winding aggregates as a result obtained by enlarging the cross-sectional area of each winding reaches the desired number.SELECTED DRAWING: Figure 6

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.

To achieve both effective heating and loss reduction.SOLUTION: In a three phase alternating current machine which operates in a fluid and has a stator 110 with at least three coils 111, etc., and a rotor 120 with at least one magnet 125, the rotor is surrounded by the at least three coils in a cross-sectional plane perpendicular to a rotation axis R of the rotor. The three phase machine includes a control device 130, which is configured to selectively energize the three coils with three alternating currents, to trigger a working mode, in which the three alternating currents generate a torque about the axis of rotation on the rotor, and to trigger a heating mode, in which the three alternating currents generate an increased power loss in comparison to the working mode due to a faster polarity reversal in at least one of the three alternating currents.SELECTED DRAWING: Figure 1A

The application relates to the field of alternating current motors, and particularly provides a brushless doubly-fed alternating current motor and a design method thereof, which comprises the following steps: configuring the winding proportion of a high-voltage winding and a low-voltage winding in the brushless doubly-fed alternating current motor in advance; connecting the high-voltage winding with a power grid and supplying power to the low-voltage winding through a low-voltage frequency converter; constructing a motor constant-flux model, a motor constant-power factor model and a motor efficiency control model according to the winding proportion; determining a first control strategy of rotor-side current according to the motor constant-flux model; determining the phase of synchronous current on the stator side and the rotor side according to the motor constant-power factor model, and constructing a second control strategy under the constant power factor; loading the first control strategy and the second control strategy into the motor efficiency control model, determining a topology equation under the maximum power efficiency, and determining design parameters according to the topology equation.

FPGA based Current controller for AC machine drives

A method includes determining a vector state of an alternating current (AC) machine. The method includes obtaining a plurality of phase current samples of the AC machine when the vector state is a zero vector state, determining a decay time constant based on the plurality of phase current samples, and determining a resistance of a winding of the AC machine based on the decay time constant.

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).

The examples described here provide a method for current correction of a vehicle's electric motor operating at a given temperature. The method includes locating an operating point (Is-β) for a nominal temperature. It further includes identifying a corresponding torque (Te) and flux (λs) at the nominal temperature and an estimated rotor temperature (Trotor). Finally, the method includes controlling the motor using current correction based on this solution to improve its operation at the operating temperature.