17results about "Motor control for low load efficiency" patented technology

A control method and apparatus (100) for a single-phase permanent magnet synchronous motor (10), a household appliance (200), and a storage medium. The control method comprises: acquiring voltage characteristics of a power frequency voltage applied to the single-phase permanent magnet synchronous motor (10) (01); acquiring a position trend of a rotor of the single-phase permanent magnet synchronous motor (10) (02); and controlling on / off of a switch (11) on the basis of the voltage trend and the position trend of the rotor, so that the position trend of the rotor matches the voltage characteristic, wherein the switch (11) is used for controlling on / off of the current of the single-phase permanent magnet synchronous motor (10) (03).

The invention relates to a dual motor unit (1) for a flywheel mass storage, having at least two electric machines (3a, 3b) coupled to a common rotor (2); wherein the electric machines (3a, 3b) each have a power characteristic curve (Pa, Pb) which is different from one another; and the dual motor unit (1) is configured to generate a total operating power in an operating speed range (Ω) by interaction of the electric machines (3a, 3b), wherein the total operating power is predefined by a total power characteristic curve (P max ) resulting from the different power characteristic curves (Pa, Pb) of the electric machines (3a, 3b), and the total power characteristic curve (P max ) depends non-linearly on the rotational speed (ω) of the common rotor (2), in order to improve a known flywheel mass storage such that the flywheel mass storage can receive and output a constant power with improved efficiency in an as large as possible operating speed range (Ω).

Energy conversion device and vehicle. The energy conversion device comprises an electric motor (10), an electronic control unit (20), a traction battery (30), and a controller (40). The controller (40) controls all bridge arms (21) corresponding to the windings of the electric motor (10) so that coordination of drive and battery self-heating is achieved, and is configured to control the peaks and troughs of the real N-line current flowing through the N-line of the electric motor to cancel out or superimpose on the peaks and troughs of the real-phase current flowing through each phase of the windings of the electric motor (10), thereby decreasing or increasing the amplitude of the real-phase current of each phase of the windings at the peaks and troughs, thereby providing the electric motor (10) with a larger phase current to drive the electric motor (10). Thus, the torque output from the electric motor (10) is increased, thereby improving the overall dynamic performance of the vehicle or increasing the heat output of the electric drive system.

This motor control device comprises: an assist torque command value generation unit which uses a steering torque to generate an assist torque command value; a manual steering command value generation unit which uses the steering torque and the assist torque command value to generate a manual steering command value; an integrated angle command value calculation unit which adds the manual steering command value to an automatic steering command value and calculates an integrated angle command value; and a switching unit which switches, in response to a switching signal, between first control for controlling an electric motor on the basis of the assist torque command value and second control for controlling the electric motor on the basis of the integrated angle command value.

To provide an electric working machine that is capable of detecting an unloaded condition of a motor with high accuracy.SOLUTION: An electric working machine comprises: a motor; a driving circuit; a physical quantity acquisition unitt; a change amount deriving unit; a total value calculation unit; and a driving control unit. The physical quantity acquisition unit acquires a physical quantity related to an operation state of the motor at each detection timing. The change amount deriving unit derives a change amount of the physical quantity at each detection timing. The total value calculation unit calculates, for each detection timing, a total value of change amounts that have been derived in a first period up to that detection timing. The driving control unit controls the motor on the basis of a first control scheme in response to the total value satisfying an unloaded detection requirement.SELECTED DRAWING: Figure 2

An inverter control device is capable of reducing an inverter junction temperature by minimizing a maximum value of a phase current flowing through an inverter. The inverter control device includes a current command output module configured to output a current command corresponding to an input torque command, a current command conversion module configured to receive the current command and a zero sequence current command, and phase-shift the current command to output a phase-shifted current command, a switching determination module configured to output a control signal based on an input motor rotation speed and the torque command, and a switching module configured to selectively output one of the current command and the phase-shifted current command in response to the control signal.

This invention provides a magnetic energy-controlled power supply system for power generation that reduces energy consumption during power generation and significantly improves power generation efficiency. [Solution] The system includes a base 10 on which a magnetic control unit 20 is mounted above, three energy storage devices 30, three controllers 40, and a crankshaft 50. The crankshaft is connected to a generator 60 and a drive unit 70. The magnetic control unit has three upright tubes 21 fixed to the base, each with a magnetic core 22 fitted inside, and each with an electromagnetic coil 23 wound around it. After energizing the electromagnetic coils, the magnetic pole direction is changed to push the magnetic cores upward and make them protrude, or push them upward and then pull them back. The crankshaft is pivotally mounted horizontally on the base, and three link rods 51 are joined to the crankshaft. The three link rods are pivotally connected to the three magnetic cores, and the crankshaft can be moved and rotated by the link rods using the protrusion or retraction of the magnetic cores.

The present invention relates to a control unit configured for controlling a motor driving a piston compressor pump below a selected rotational speed value. The motor is driven by a frequency converter comprising a rectifier unit being operatively connected to an inverter unit via an intermediate DC circuit. According to the present invention the control unit comprises a motor speed calculation unit for calculating, in the digital domain, the rotational speed of the motor based on measured BEMF voltages from the motor, a speed controller unit for calculating, in the digital domain, a stator current reference based on the calculated rotational speed and a rotational speed reference, a D / A converter unit for converting the calculated stator current reference from the speed controller unit to an analog stator current reference, a comparator unit for comparing, in the analog domain, the analog stator current reference and a measured current in the intermediate DC circuit of the frequency converter, and providing a comparator unit output in response to this comparison, and a PWM unit for providing PWM control signals to a phase commutation unit in response to the comparator unit output, said phase commutation unit providing a switch pattern to the inverter unit based on the measured BEMF voltages from the motor. The present invention further relates to an associated method.

The invention relates to an inverter control apparatus, an inverter control method, and a vehicle including the inverter control apparatus. Specifically, the inverter control device can reduce the junction temperature of the inverter by minimizing the maximum value of the phase current flowing through the inverter. The inverter control device comprises a current command output module, a current command conversion module, a switching determination module and a switching module, wherein the current command output module is configured to output a current command corresponding to an input torque command; the current instruction conversion module is configured to receive a current instruction and a zero-sequence current instruction, and perform phase shift on the current instruction to output a phase-shifted current instruction; the switching determination module is configured to output a control signal based on an input motor rotating speed and a torque instruction; the switching module is configured to selectively output one of a current command and a phase shifted current command in response to a control signal.

The invention provides a motor step-down power-saving device and an intelligent AC induction motor system, line voltage real-time monitoring data, line current real-time monitoring data and motor environment real-time monitoring data of a target AC induction motor are monitored and collected through a motor monitoring module, and a motor control module, such as a microcontroller, is used for controlling the voltage of the target AC induction motor. When it is judged that the target AC induction motor meets the voltage reduction and power saving conditions, a target line voltage effective value of the target AC induction motor is calculated based on a pre-trained motor voltage regulation parameter prediction model, and a voltage regulation control signal is generated according to the target line voltage effective value so as to control a motor voltage regulation module to adjust the terminal voltage of the target AC induction motor to the target line voltage effective value; therefore, the terminal voltage and the stator current input into the target alternating-current induction motor are adjusted in time by applying the optimal control principle, so that the target alternating-current induction motor is always in the optimal working state, the motor energy consumption is reduced, and the motor efficiency and the power saving rate are improved.

This disclosure generally relates to systems and methods for controlling electrical systems. A method for controlling an inverter circuit (820) is disclosed, comprising: receiving a first signal indicating a vertical flight mode; implementing a first switching sequence to control the inverter circuit (820) during the vertical flight mode, wherein the first switching sequence includes two zero vectors and six active vectors; receiving a second signal indicating a propeller stow mode; and implementing a second switching sequence to control the inverter circuit (820) during the propeller stow mode, wherein the second switching sequence includes fewer switching vectors than the first switching sequence.

A boost circuit is arranged to reduce rise and fall times of pulsed power used for pulsed control operation of electric machines. Magnetic energy present in the electric machine at the end of a pulse is extracted by the boost circuit to reduce the pulse fall time. The energy is stored by the boost circuit and then applied at the beginning of a subsequent pulse to reduce the rise time. By reducing rise and fall times compared to not using such a boost circuit, machine efficiency is improved.

A machine arrangement (20) comprises an electric machine (31), a first pulse inverter (41) and a second pulse inverter (42), wherein the electric machine (31) comprises a stator arrangement (33) and a rotor arrangement (34), wherein the stator arrangement (33) comprises a stator core (35), a first winding arrangement (36) and a second winding arrangement (37), wherein the first winding arrangement (36) is configured as a multiphase winding arrangement with at least three first windings (361, 362, 363) and with at least three first winding terminals (3611, 3621, 3631), wherein the second winding arrangement (37) is configured as a multiphase winding arrangement with at least three second windings (371, 372, 373) and with at least three second winding terminals (3711, 3721, 3731).wherein the first pulse inverter (41) is a multi-phase pulse inverter and wherein the second pulse inverter (42) is configured as a two-phase pulse inverter. The first winding arrangement (36) and the second winding arrangement (37) do not include a common winding.

An inverter control device is capable of reducing the junction temperature of an inverter by minimizing the maximum value of a phase current flowing through the inverter. The inverter control device comprises a current command output module configured to output a current command corresponding to an input torque command; a current command conversion module configured to receive the current command and a zero-sequence current command and output the current command phase-shifted to produce a phase-shifted current command; a switching determination module configured to output a control signal based on an input motor speed and the torque command; and a switching module configured to selectively output either the current command or the phase-shifted current command in response to the control signal.

This application discloses a powertrain and a vehicle. The powertrain includes a motor and a motor controller. The motor includes a first winding and a second winding, and the motor controller includes a control unit, a first drive circuit, and a second drive circuit. The control unit is used to control the first drive circuit to stop working and control the second drive circuit to work when the motor load is less than a preset load; it is also used to control both the first and second drive circuits to work when the motor load is greater than or equal to the preset load. In the first drive circuit, each phase's power device is an insulated-gate bipolar transistor (IGBT); in the second drive circuit, each phase's power device is a wide-bandgap semiconductor device. Furthermore, the current density of the first winding is greater than the current density of the second winding. This powertrain can improve the working efficiency of the motor controller and the motor, thereby increasing the driving range of the electric vehicle.

The invention discloses a control method and device of a single-phase permanent magnet synchronous motor, a household appliance and a computer readable storage medium. The control method comprises the following steps: acquiring voltage characteristics of power frequency voltage applied to the single-phase permanent magnet synchronous motor; acquiring a position trend of a rotor of the single-phase permanent magnet synchronous motor; and on-off of a switch is controlled according to the voltage trend and the position trend of the rotor, so that the position trend of the rotor is matched with the voltage characteristics, and the switch is used for controlling current on-off of the single-phase permanent magnet synchronous motor. According to the control method and device of the single-phase permanent magnet synchronous motor, the household appliance and the storage medium, the on-off of the switch is controlled according to the voltage trend and the position trend of the rotor, so that the position trend of the rotor is matched with the voltage characteristic, and when the single-phase permanent magnet synchronous motor is in light-load operation, the on-off of the switch is controlled. The influence of too fast rotation caused by too large power of the single-phase permanent magnet synchronous motor is reduced, so that the power consumption of the motor is reduced.