36results about "Reluctance motor starters" patented technology

A power converter for a switched reluctance motor or a permanent magnet brushless direct current (dc) motor may include first and second partial circuits for forming multiple conduction circuits in cooperation with first and second phase windings of the motor. The controller also includes a switch operable to open and close a first conduction circuit, which includes the first phase winding, and to regulate energization of the first and second phase windings of the motor through opening and closing the first conduction circuit. Control of the switch provides four-quadrant operation of the motor through regulated energization of the first and second phase windings.

Disclosed is a method and device for controlling the startup of a synchronous reluctance motor. The device includes: a voltage injector which generates injection voltages to estimate an initial position of the rotor; a motor drive voltage generator which converts stationary-coordinate-system voltages including the injection voltages to three-phase motor drive voltages and applies the three-phase motor drive voltages to the motor; a current extractor which extracts response current components iα-inj, iβ-inj in respect to the injection voltages from two-phase stationary-coordinate-system currents converted from three-phase currents detected upon rotation of the motor; and a position / speed estimator which extracts response current components related to a rotor position from the response current components iα-inj, iβ-inj in respect to the injection voltages to calculate a rotor position error (e), and estimates the speed and position {tilde over (ω)},{tilde over (θ)} of the rotor from the calculated rotor position error (e).

A starting system and method for starting a salient-poled-rotor electric motor having a stator with a plurality of spaced salient poles, a plurality of field coils of unchanging polarity, and a plurality of armature coils, wherein each field coil of the plurality of field coils at least partially overlaps an armature coil of the plurality of armature coils, and wherein variable excitement of the armature coils alternately creates a magnetic pole force in every other pole of the plurality of spaced salient poles of the stator. In such motors, the stator has a first position, wherein the rotor is in stasis with respect to the stator and torque between the rotor and the stator is substantially minimized, and a second position, wherein torque between the rotor and the stator is substantially maximized. A drive circuit provides current to the field coils and the armature coils. A start circuit is provided for regulating the drive circuit to vibrate the rotor to the second position. A current source is connectable to the drive circuit for variably exciting the armature coils to produce substantially continuous rotation of the rotor. A switch is provided for electrically engaging the start circuit with the drive circuit while the rotor moves from the first position to the second position, and for electrically engaging the current source with the drive circuit when the rotor reaches the second position.

Disclosed herein are a motor acceleration apparatus and a motor acceleration method. The motor acceleration apparatus includes: a rectifying unit converting household power into direct current (DC) voltage to output the converted DC voltage; a switching converter switching the DC voltage output from the rectifying unit in an alternating current manner so as to drive a two-phase switched reluctance motor (SRM) ; and a microprocessor controlling the switching converter at the time of initial acceleration of the two-phase SRM so that an initially set dwell angle is changed to a dwell angle in a normal operation state and starting advanced-angle control.

The invention discloses a multi-level power topology structure of a switch reluctance motor. A boost circuit part is additionally arranged between a traditional asymmetric power conversion circuit and a DC power supply and comprises a capacitor C1, a boost capacitor C2, a switching tube T1 and a diode D1, a switching tube T3, a diode D3 and a bidirectional switch, wherein the switching tube T1 and the diode D1are reversely connected in parallel, the switching tube T3 and the diode D3 are reversely connected in parallel, and the bidirectional switch comprises a switching tube T2 and diodes D21, D22, D23 and D24. By controlling the switch-on and the switch-off of the switching tubes in the power topology, the switch reluctance motor can run by switching among five states of rapid excitation (+2), rapid demagnetization (-2), normal excitation (+1), normal demagnetization (-1) and follow current (0). The rapid excitation and the rapid demagnetization of the switch reluctance motor are achieved, the problems of slow excitation current rise and reduction, low system efficiency, low dynamic performance and the like during motor running are solved, and the multi-level power topology structure has high robustness, high reliability and intelligence and has huge application prospect.

A motor control apparatus which is applied to an actuator provided with a motor and an encoder, and drives the motor is provided. The motor control apparatus comprises: a controller that learns an initial position of a rotor, and also decides an energized phase; and a drive circuit that performs switching operation to energize an energized phase. The controller learns that, in learning the initial position, the initial position of the rotor is a two-phase facing position in which two adjacent salient poles of the rotor face salient poles of two energized phases of a stator, and the initial position of the rotor is a one-phase facing position in which one salient pole of the rotor faces a salient pole of one non-energized phase of the stator.

The invention discloses a rheostat structure based on an electro-hydraulic starter rheostat. The rheostat structure comprises a water tank, three pairs of electrode bars inserted into the water tank and an electrode bar lifting structure capable of changing water resistance. A standby water tank, locating columns, a float, a magnetic material arranged on the float and a reed pipe are further included, the standby water tank is arranged adjacent to the water tank, the water tank and the adjacent water tank are separated only through a common plate, a water pump is arranged in the standby water tank, and the water pump can inject water of the standby water tank into the water tank through an inlet in the upper portion of the water tank. The locating columns are fixed in the water tank. The locating columns are sleeved with the float, and the float can vertically move along the water level. The reed pipe is arranged in a sealing pipe of the non-magnetic-conducting material. When the water level of the water tank is reduced, the reed pipe is triggered by the magnetic material to be closed, and the water pump works. A water tank cover is provided with holes allowing the electrode bars to be inserted, sealing rings and housings fixing the sealing rings on the inner face of the water tank cover, and the electrode bars are sleeved with the sealing rings. The rheostat structure has the advantages of reducing the temperature of the water tank, automatically adding water, preventing water losses, and prolonging the maintenance period.