4results about How to "Reduce electromagnetic torque ripple" patented technology

The application relates to the technical field of motor control and discloses a servo drive control system based on DSP, ARM and FPGA multi-platform cooperation, which comprises FPGA, DSP and ARM modules connected through a parallel data bus, a dual-port storage module, an analog-digital conversion module and an inverter module, the FPGA is connected with the DSP and the ARM through a hardware control bus, the maximum transmission delay window is calculated by the DSP based on motor electrical angular velocity, bus arbitration is performed by the FPGA according to the window and burst access prediction duration, sampling data and carrier relative time stamps are encapsulated and stored into the dual-port storage module, phase dynamic compensation is performed by the DSP by reading data in combination with real total delay time, space vector pulse width modulation duty cycle parameters are generated, and the FPGA outputs a plurality of switch tube driving signals based on the parameters. The application eliminates rotor magnetic field phase deviation caused by bus competition suspension, guarantees closed-loop current decoupling accuracy and maintains communication throughput.

This invention relates to the field of electric motors, and more particularly to an electric motor rotor. The electric motor rotor includes: a trapezoidal slot formed on the outer circumferential surface of the motor rotor, the trapezoidal slot having a base edge; a magnet slot, the axis of symmetry of the magnet slot passing through the center of the inner diameter of the motor rotor, the trapezoidal slot being formed on at least one side of the axis of symmetry of the magnet slot, the magnet slot having a first side line; and a magnetic stabilizing hole formed between the outer circumferential surface of the motor rotor and the magnet slot, the longitudinal axis of the magnetic stabilizing hole being perpendicular to the first side line, the magnetic stabilizing hole and the trapezoidal slot being on the same side of the axis of symmetry of the magnet slot, the axis of symmetry of the trapezoidal slot passing through the center of the inner diameter of the motor rotor, an angle α1 between the longitudinal axis of the magnetic stabilizing hole and the axis of symmetry of the trapezoidal slot, and an angle α2 between the longitudinal axis of the magnetic stabilizing hole and the axis of symmetry of the magnet slot, α1 and α2 satisfying 0.701≤(α1-α2) / α1≤0.958. This invention also relates to an electric motor. This invention can effectively reduce the no-load back EMF harmonics of the motor, improving motor efficiency and operational smoothness.

This invention relates to the field of motor control technology, specifically to a method and system for mitigating open-circuit faults in a three-phase induction motor. The method includes: obtaining a speed setpoint and the actual speed to form a speed deviation; inputting the speed deviation into a composite speed controller in a closed-loop V / f control structure to generate a frequency adjustment quantity; determining a target frequency command based on the frequency adjustment quantity and pole number conversion relationship, and generating a stator voltage amplitude command under a constant V / f ratio; obtaining the synchronous electrical angle through integration and generating a modulation signal; performing pulse width modulation based on the modulation signal to drive the three-phase inverter to output three-phase drive voltage; and when a stator phase open circuit causes a double-frequency disturbance in the dq coordinate system, using a resonant adjustment branch for tracking compensation to reduce speed fluctuations and electromagnetic torque pulsation, maintaining continuous motor rotation. This invention solves the problem of high control system complexity in existing induction motors due to reliance on independent fault detection and complex fault-tolerant switching mechanisms.

The utility model relates to a sine wave surface magnetic steel structure capable of reducing electromagnetic torque pulsation, which comprises a rotor and a stator, the rotor comprises a rotor core, a shaft core and magnetic steel, the shaft core is fixedly installed inside the rotor core, the magnetic steel is fixedly installed outside the rotor core, and the shaft core is fixedly installed outside the rotor core. The stator comprises a rotor iron core, an enameled wire armature winding and an air gap, the air gap is arranged outside the magnetic steel, the enameled wire armature winding is fixedly installed inside the rotor iron core, and the rotor is rotatably connected inside the rotor iron core. According to the sine wave surface magnetic steel structure capable of reducing the electromagnetic torque pulsation, the outer surface of the magnetic steel is made into an arc-shaped structure, so that the air gap flux density waveform of the motor is in a sine wave state, the electromagnetic torque pulsation of the motor can be effectively reduced when the inner rotor permanent magnet direct current brushless motor rotates, and therefore vibration and noise are effectively reduced; the stability and the overall performance of the motor are improved.