35 results about "Switched reluctance drive" patented technology

A switched reluctance drive, operating either as a motor or a generator, is controlled in a stable manner in the continuous current mode in the presence of supply voltage or electrical load variation. The use of a current control parameter Ix in addition to the conventional on- and off-angles θon, θoff gives the ability to operate smoothly in the continuous current mode and to transition smoothly between operating modes. Once the phase current reaches a pre-determined level Ix, the phase winding may be placed in a freewheel state, thereby controlling the standing current in the phase winding and / or the output voltage.

A switched reluctance drive is controlled without using a physical rotor position detector. The control method causes current to flow continuously in a single winding when the rotor is turning and detects position by finding either the peak of the current waveform or some other feature which can be uniquely related to the position of the rotor.

The invention relates to a method of detecting rotor position in a reluctance machine which has at least one phase winding with an inductor periodically varied along with the rotor position. The method comprises deriving a value for the flux linkage at a first point is relevant to the at least one phase winding of the reluctance machine; tracking a parameter indicative of flux linkage; pushing the rotor to a second point where a positive voltage is applied to the phase winding; deriving a phase current value and the parameter at a subsequent third point; estimating the flux linkage value of the third point based on the parameter of the third point; and deriving the rotor position from the phase current value and the flux linkage valve of the third point. The invention also relates to a rotor position detector used for the reluctance machine.

The present invention relates to variable voltage compensation in which a switched reluctance driver is powered by a voltage source that is different from the voltage determined for the driver control rules. The control system compensates for these differences by simultaneously correcting the speed and torque values, which are used to determine the correct firing angle for the load required to drive. The system can operate in environments where a wide voltage variation range occurs and is independent of the shape of the drive's torque / speed curve.

The invention discloses a control method of a switched reluctance driving system for a pumping unit, belongs to the field of electric engineering, and relates to a stable, efficient and energy-saving control method of a switched reluctance motor drive system for the pumping unit, in particular to an automatic identification method for a load characteristic of the pumping unit and a load characteristic-based adaptive control method for a switched reluctance motor. A load torque switching point detection method is characterized in that any sensor or circuit is not added while the pulse number of a built-in position sensor of the switched reluctance motor is detected; meanwhile, a three-phase current detected by a current detection circuit is sampled; and counting and judging are carried out through a microcontroller. A control system finishes quantification of a torque switching point position in a stroke of the pumping unit through a self-learning mode, automatically enters a load self-adaptive control state, and changes PI parameters of a rotating speed regulator and a current regulator according to the load characteristic of the pumping unit, so that an output torque of the switched reluctance motor is matched with the load torque of the pumping unit.

A current loop reconfiguration method for controlling a four-phase switched reluctance motor belongs to the technical field of switched reluctance motor control. The switched reluctance drive system is a speed and current double closed-loop control system. The outer loop is the speed loop control; the inner loop is the current loop control. Usually, the four-phase switched reluctance motor needs four independent current sampling loops, which will increase the control circuit. cost and volume. For this reason, in some applications that have strict requirements on volume and cost, four phases share one sampling loop to detect current. When the four phases share a current sampling loop, in order to allow the four-phase switched reluctance motor to accurately feed back the current of each phase, the shape function of the current waveform is constructed, and the current distribution function of each phase is obtained through the current shape function of each phase. The collected current is then multiplied by the distribution function for each phase. In this way, a four-phase feedback current is reconstructed from a feedback current loop. Get the actual and accurate current of each phase of the motor. To achieve the purpose of precise and stable operation of the motor.

A switched reluctance machine has salient poles on the stator and rotor. The windings of the machine are supplied from a converter which provides energisation at a chosen rate. The windings of the machine may be energised at the rate at which the rotor poles pass the stator poles, or it may be operated at a fraction of that rate by energising the windings to cooperate with every second, third or fourth rotor pole. This can extend the output of the machine.