35 results about "Switched reluctance drive" patented technology

A switched reluctance drive is controlled without using a physical rotor position detector. The control method estimates the standing flux-linkage associated with the phase and uses this estimate to improve its subsequent estimate of rotor position. The method works robustly regardless of whether the current is continuous or is discontinuous.

A switched reluctance drive is supplied from a voltage source which varies from the voltage at which the control laws for the drive were determined. The control system compensates for this by modifying both the speed and torque values used to determine the correct firing angles for the demanded load. The system works over a very wide range of voltage variation and is independent of the shape of the torque/speed curve of the drive.

A switched reluctance drive is controlled without using a physical rotor position detector. The control method estimates the standing flux-linkage associated with the phase and uses this estimate to improve its estimate of rotor position. The method works robustly regardless of whether the current is continuous or discontinuous.

A switched reluctance machine has a stator which has an array of alternate wide and narrow poles around its inner circumference. Coils are wound around the wide poles only. The rotor includes segments of soft magnetic material carried on a non-magnetic core. The segments are so proportioned at the air gap that the flux produced by one stator coil passes through two or more segments and returns through the adjacent narrow poles. The machine is capable of producing a high output.

A switched reluctance drive is supplied from a power source. The phases of the machine are controlled by a current controller which uses an excitation strategy to minimize the supply current drawn for a particular output. The strategy alternates the excitation between two phases for a given time until the rotor moves to a desired position. A method of starting a switched reluctance motor having a stator with at least two phases, a moveable part, and a position transducer includes determining from transducer output a plurality of phases that are available to produce force in a desired direction, energizing a first phase of the available phases for a predetermined time period that is independent of the transducer output, and energizing a second phase of the available phases after energization of the first phase is initiated.

The invention discloses a five-degree-of-freedom co-excited bearing-less switched reluctance motor system and a control method. The system is composed of a switch reluctance motor, a hybrid magnetic bearing and a radial magnetic bearing, wherein bias windings of the two bearings and an m-phase armature winding of the switch reluctance motor share the same set of power converter; with the adoptionof a co-excited manner, biased magnetic flux is generated in the two bearings when torque is generated in the switch reluctance motor; the m-phase armature winding adopts the traditional switch reluctance drive mode; and the current of the bias winding is only related to working conditions of the switch reluctance motor, and no control is performed. In addition, current of five suspending windingsis reasonably controlled by combining with the current of the bias winding collected in real time, so that five-degree-of-freedom suspension operation can be realized. According to the system disclosed by the invention, suspension force is decoupled, the suspension force and the torque are also decoupled, the control variable is less, the suspension control is simple, the integration level is high, the reliability is high, no permanent magnet exists in the system, the environmental suitability is high, and the system has unique advantages in high-speed or ultra-high-speed application occasions.

A switched reluctance drive is supplied from a power source. The phases of the machine are controlled by a current chopping controller which uses an excitation strategy to minimise the supply current drawn for a particular output. The strategy is to allow an out-going phase to freewheel as long as it produces positive torque while the incoming phase is excited.

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 I_x in addition to the conventional on- and off-angles θ_on, θ_off 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 I_x, the phase winding may be placed in a freewheel state, thereby controlling the standing current in the phase winding and/or the output voltage.

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.

The invention discloses an electromagnetic bearing switch magnetic resistance motor system and a control method. The motor system comprises a switch magnetic resistance motor, a three-DOF magnetic bearing and a radial magnetic bearing. Bias windings of the two magnetic bearings are connected in series and are then connected with DC buses of asymmetric half-bridge power converters of m phase armature windings of a switch magnetic resistance motor through four diodes, the m phase armature windings employ a traditional switch magnetic resistance driving mode, under the rectification effect of thefour diodes, a continuous invariant current is generated in a bias winding to provide bias magnetic flux for the two magnetic bearings; through reasonable control on currents of the five suspension windings, five-DOF suspension operation can be realized, mutual decoupling among five suspension forces is carried out, and decoupling between the suspension forces and torques is carried out. The motor system is advantaged in that the integration degree is high, the dynamo-electric energy conversion utilization rate is high, control variables are in a small quantity, suspension control is simple,reliability is high, the motor system has no permanent magnet, so working environment adaptability is strong, and the motor system is especially suitable for high-speed or super-speed application occasions.

The invention discloses a new green energy carry-scraper and belongs to the technical field of underground mining. According to the new green energy carry-scraper, a battery device provides power fora microprocessor center through a direct-current power adapter, the battery device is connected with a switched reluctance drive (SRD) through a switch circuit, and the SRD is connected with a workingmechanism; the microprocessor center controls the switch circuit and the SRD; and a battery managing circuit receives the data of a battery pack, the microprocessor center reads the battery pack datareceived by the battery managing circuit, the battery pack data is displayed on a display screen, and the microprocessor center controls a battery charging mechanism to act. The new green energy carry-scraper has the beneficial effects of being simple in structure, high in stability, free of distance limitation and wide in view and cannot pollute the environment, meanwhile according to the new green energy carry-scraper system, the hydraulic loss can be reduced, the mechanical abrasion is reduced, the replacement period of hydraulic oil is prolonged, and the production cost is reduced.

A switched reluctance drive is operated as a generator on a high voltage supply which has no long-term energy storage capability. A low voltage supply is used to start the generator through the use of a dedicated priming winding, which provides sufficient energy to allow the generator to build up charge in DC link capacitor(s). Once sufficient charge has built up, the priming winding is de-energized and the generator continues in a steady-state operation.

The invention relates to a switched reluctance driving system and a control method. The switched reluctance driving system and the control method of the invention are based on the two physical quantities torque and speed output by the motor based on accurate current and rotor position detection to realize a real closed-loop vector control, making current, torque and speed control with high precision. High precision current control, which effectively suppresses the generation of large current peaks, and also reduces motor noise; high precision torque control, greatly reduces torque ripple, has little impact on the power module, and improves reliability during operation; High speed control accuracy ensures the stability of overall control performance; high efficiency and low heat generation under frequent startup and overload conditions, and cooperates with internal temperature and power adjustment curves to optimize the performance of the switched reluctance drive system. In view of the above reasons, the present invention can be widely used in the field of motor driving.

The invention discloses a switched reluctance driving device with efficient heat dissipation, and relates to the technical field of switched reluctance driving. The switched reluctance driving devicewith an efficient heat dissipation function comprises a buffer pad, a fixing plate, a supporting rod, a protective shell, a buffer spring, a driving motor, a ventilation shell, a first ventilation device, a water circulation device, a second ventilation device, heat dissipation shells, cooling fins, heat dissipation holes, a placement shell, fixing grooves, bolts, nuts, a rotor, a stator, positioning holes and a dust filter screen. The number of the heat dissipation holes formed in the front face of the heat dissipation shell is half of the number of the heat dissipation holes formed in the back face of the heat dissipation shell, the heat dissipation function of the device can be improved due to the fact that the heat dissipation holes are formed in the heat dissipation shell, heat can overflow from the lower portion and can also overflow from the front face and the back face of the heat dissipation shell, heat dissipation of the cooling fins is facilitated, the placement shell is arranged at the front surface of the device, in order to avoid temperature rise of the placement shell, no heat dissipation holes are formed in the heat dissipation shell on the back face of the placement shell, the safety performance of the device is improved, and the heat dissipation function is added.

The invention discloses an improved current prediction control method of a switched reluctance motor, and belongs to the technical field of switched reluctance motor control. A system for completing the control method comprises a microcontroller, a three-phase switched reluctance motor, a power converter, a PWM driving unit, a current sensor, a current detection filter circuit and a position detection unit; the main circuit of the PWM driving unit is of a three-phase asymmetric half-bridge structure; According to a switched reluctance driving system, a double-closed-loop control system is adopted, an outer loop employs rotating speed loop control, an actual rotating speed is calculated through a position detection unit, and a reference current is obtained through a PI controller after the difference between a reference rotating speed and the actual rotating speed is obtained; an inner loop employscurrent loop control, the relation among inductance, current and a rotor position angle is obtained through finite element analysis, and corresponding phase inductance values and control frequency of the motor are obtained through phase current and the rotor position angle through a two-dimensional look-up table method. A corresponding predicted current interval is obtained through the above conditions, and then the precise time of each switching state is calculated to serve as a PWM conduction signal of a conduction phase to be used for driving the motor.

The invention relates to a locomotive drive technology driven by an in-wheel motor using switched reluctance motor (SRD) technology. Usually, this SRD in-wheel motor drive technology is applied in the wheel hub of gasoline-electric hybrid locomotives and pure electric locomotives. The invention can drive and actively brake the locomotive by setting an SRD (switched reluctance motor) drive in the wheel hub without changing the existing wheel hub of the locomotive, and can recover the braking energy. Compared with the current mainstream new energy vehicles, the motors are connected in parallel or in series at the engine side of the vehicle, without major changes to the vehicle itself, and can be applied to most locomotives. The cost of development and transformation is low, and the structure is simple. Since the active control ensures that the engine of the locomotive works under better working conditions most of the time, the fuel economy of the locomotive is improved.

The invention discloses a simplified flux method-based fault tolerance operation method for a switched reluctance motor speed adjusting system, aiming at faults of current sensors or voltage sensors. The fault tolerance operation method comprises the following steps: selecting a target position, measuring flux-current characteristic data, acquiring phase current voltage, calculating dynamic flux and a different value of dynamic fluxes at any two moments, calculating fault flux, judging whether the difference value of the dynamic fluxes is identical to a fault flux value or not, if the difference value of the dynamic fluxes is identical to the fault flux value, confirming that a sensor has faults, and transmitting an instruction for delaying fault phase control according to electromagnetic signals of a normal phase winding, if the difference value of the dynamic fluxes is not identical to the fault flux value, confirming that the sensor has not fault, and transmitting an instruction for delaying on/off control on the phase winding according to the electromagnetic signals of the phase winding. By adopting the fault tolerance operation method, a switched reluctance motor without a position sensor can still correctly estimate the position of a rotor under the situation that certain current sensors or voltage sensors have faults, and the operation stability of a switched reluctance motor system is improved.

A switched reluctance drive is supplied from a power source and has a DC link, across which is a DC link capacitor. The phases of the machine are controlled by a controller which controls the switches connecting each phase winding to the DC link. The controller switches off the switches of each phase in a sequence which minimises the peak voltage appearing on the DC link capacitor, thereby allowing a reduction in the voltage rating of the capacitor.