44results about "Synchronous motors starters" patented technology

A method for detecting movement of a vehicle body component moveable by an electric motor having a rotor and a three-phase stator, and a motor vehicle. The method includes: loading two stator phases with a pulse-width-modulated voltage and maintaining a third stator phase at a free-floating state; monitoring the third stator phase as a measuring point for an inductive voltage divider formed using the two stator phases; and detecting movement of the vehicle body component when an electric signal at a measuring point or a variable derived from the electric signal exceeds a specified threshold value. The motor vehicle includes a control device that is operable to perform the method.

The present invention relates to a method for starting a BLDC motor (10) with a trapezoidal shaped induction voltage under high load conditions using a modified two-level discrete fixed-time or fixed-frequency hysteresis current controller, the BLDC motor (10) being driven by an inverter bridge (30) with only one current sensor (20) placed on the busbar and controlled by a processing unit associated with an analog-to-digital converter, the novelty of which consists essentially in the fact that the intensity of the current (Im) of the BLDC motor is controlled by a two-level discrete fixed-time or fixed-frequency hysteresis current controller.

The present invention refers to a starting method with two-levels modified and discrete fixed-time or fixed-frequency hysteresis current controller, under high load conditions, of a BLDC motor (10) with trapezoidal-shaped induced voltages, wherein the BLDC motor (10) is driven by an inverter bridge (30) with only one current sensor (20) positioned in the busbar, controlled by means of a processing unit associated to an analog-digital converter, wherein the novelty basically comprises the fact that: the intensity of the BLDC motor current (Im) is controlled by means of the two-levels and discrete fixed-time or fixed-frequency hysteresis current controller.

Disclosed is an apparatus for detecting a sensing delay of a sensor provided in an electric motor, the apparatus including: a shaft configured to be axially coupled with the electric motor; a load machine axially coupled with the shaft; a controller configured to control a rotational speed of the load machine; a torque sensor connected to the load machine and configured to measure a torque; and a detector configured to detect a sensing delay of the sensor based on a torque value obtained using the torque sensor.

The invention relates to a method for controlling an electrical converter (10). The electrical converter (10) is configured for converting a DC voltage from a split DC-link (16, 18) into a three-phase output voltage to be supplied to three output phases (a, b, c), wherein for each output phase, the electrical converter (10) has a changeover switch (20, 22, 24) configured for generating three voltage levels. The method comprises: calculating a degraded mode reference current (51) for each of the phases; determining a voltage reference (53) from the degraded mode reference current; and switching the electrical converter (10) to generate the voltage reference in the output phases; wherein the degraded mode reference current is (51) determined as a repeating sequence of six or less options over one fundamental period.

In accordance with various embodiments of the present disclosure, a system for indirectly measuring an angular position and / or a rotational speed of an electrical machine having a rotatable shaft, a wound rotor, and a stator having three or more phases is provided. In some embodiments, the system comprises a switching converter adapted to provide a current to the wound rotor that has a component detectable in the stator, current sensing circuitry adapted to detect a stator current, filtering circuitry adapted to extract the detectable component, and control circuitry for (i) transforming the extracted detectable component into two, 90 degree displaced currents, (ii) demodulating the two, 90 degree displaced currents to obtain an envelope waveform for each of the two, 90 degree displaced currents, and (iii) analyzing the envelope waveforms for the two, 90 degree displaced currents to determine an angular position and / or a rotational speed of the rotatable shaft.

The invention relates to an angular position control method (100) for a motor vehicle, comprising a step (109) of controlling the angular position of a geared motor (x(t)), which comprises: a determination (105) of the angular position of the geared motor (x(t) = Sp(tO) + K*Yr(t)) on the basis of a detection of the angular position of the motor shaft by an angular position sensor of the motor shaft, and / or a determination (113) of the angular position of the geared motor (x(t) = Sp(t)) on the basis of a detection of the angular position of a movable element by a moveable element angular position sensor.

Described is a method of aligning a stationary rotor of a polyphase synchronous motor having a permanent magnet rotor to a configured rotor angle (θ). The method includes determining corresponding polyphase drive voltages for the synchronous motor based on a user-specified value of a two-axis synchronously rotating reference frame vector voltage (V) for a selected one of two axis of the two-axis synchronously rotating reference frame. Then, determining corresponding polyphase drive voltages for the synchronous motor; and applying said polyphase drive voltages for a predetermined, selected, or calculated time period to rotate the stationary rotor to align said rotor with said configured rotor angle (θ).

A motor starting method and a motor starting circuit are disclosed. The motor starting method includes: (1) obtaining the rotor current position; (2) asynchronously driving the motor at the current rotor position and the rotation direction to gradually increase the open-loop angle to a target angle and gradually increase the quadrature-axis reference current, wherein the open-loop angular increment gradually increases with time to implement smooth starting; and (3) motor entering a closed-loop control mode. By introducing the open-loop angle, open-loop angular increment, and angular addition increment, implementing the hardware starting circuit becomes easier, only one adder can complete starting, consuming only a few hardware, thereby releasing the CPU resources. This smooth starting approach reduces the “gear shifting” feeling, speeds up the starting process, and lowers the risk of inversion. The technique can be applied to other motors with shared computational logic to reduce costs.

A method of setting up an electrical motor speed control in a fluidic system including a turbomachine, an electric motor having a number p of pole pairs rotating the turbomachine, a variable speed drive controlling the speed of the electric motor, a sensor measuring a parameter H, Q of the turbomachine, and a system controller receiving the sensor's measurements and controlling the operation of the fluidic system. The method includes driving the electric motor at a predetermined electrical frequency, Fe, such that the turbomachine rotates with a controlled rotational speed N, determining the point of intersection of the system curve of the fluidic system and of the performance curve of the turbomachine to obtain the turbomachine's nominal operating point, and thus the nominal value, Hn, Qn, of the turbomachine parameter, measuring, with the sensor, the current value, H, Q of the turbomachine parameter, calculating the controlled rotational speed N by inputting, into the Affinity Laws, the determined nominal value, Hn, Qn, the measured current value, H, Q, and the known nominal rotational speed, Nn, of the turbomachine, determining the number p of pole pairs of the electric motor based on the ratio of the electrical frequency Fe and the calculated controlled rotational speed N, and adapting the setup of the variable speed drive to match the determined number p of pole pairs.

A thyristor element assembly structure comprises a first radiator (50), a second radiator (70) and a thyristor element (5) sandwiched between the first radiator and the second radiator, wherein the thyristor element (5) is connected with the first radiator (50) and the second radiator (70) that are on both sides of the thyristor element by means of a plurality of insulating fasteners (10), the thyristor element (5) comprises a gate assembly (80) and a chip packaging assembly (60), the chip packaging assembly (60) comprises a first packaging shell (606) and a second packaging shell (601), the first packaging shell and the second packaging shell enclose a packaging cavity, the second packaging shell (601) is provided with a blind hole (608) which is at least partially and fixedly connected to the gate assembly, side walls of the blind hole (608) serve as a portion of cavity walls of the packaging cavity, and the gate assembly (80) is fixedly engaged to the blind hole (608) of the chip packaging assembly.

The invention relates to a method for detecting a movement of a pivotable body part, in particular a flap, of a motor vehicle, the motor vehicle comprising an electric motor having a stator and a rotor, the electric motor being configured for electrically opening and / or closing the pivotable body part, the electric motor being a BLDC motor having a three-phase stator (A, B, C), the two phases of the stators (A, B) are loaded with a pulse width modulated voltage, the third phase (C) remaining free floating, the third phase (C) being monitored as a measurement point for an inductive voltage divider formed using the other two phases (A, B), and if a signal at the measurement point or a variable derived from the signal exceeds a specified threshold value, the third phase (C) is monitored as the measurement point for the inductive voltage divider. If so, an opening movement or a closing movement of the pivotable body part is detected, and a motor vehicle wherein a control device of the motor vehicle is configured to carry out such a method.

The system (100) is used for starting and synchronizing synchronous motors (10) with power electricity of an electric grid (20). The system (100) includes a variable frequency driver (30) for starting the synchronous motors (10), and an electrical diverter (61, 63) for each synchronous motor (10). The electrical diverter (61, 63) has a control input electrically coupled to a control output of the variable frequency driver (30) so to selectively couple stator windings (12) of synchronous motors (10) with a power output (33) of the variable frequency driver (30) or with the electric grid (20) based on signals that are received at a control input of the variable frequency driver (30) and represent a position of the shafts of the synchronous motors (10). Therefore, switching occurs at desired shafts positions.

The present technology relates to soft-starts of alternating current (AC) motors, and particularly, to controlling a soft-start of an AC motor using a configuration of transistors and diodes. A system may include processing circuitry and gating circuitry. The gating circuitry may include a first transistor coupled to an AC voltage supply, a second transistor coupled to the first transistor and to an AC motor, a first diode coupled across current path terminals of the first transistor, and a second diode coupled across current path terminals of the second transistor. The processing circuitry may be configured to monitor voltage and current of the AC voltage supply and provide gating signals to the control terminals of the first and second transistors to control operations of the first and second transistors based at least in part on one or more desired firing angles and the voltage or current of the AC voltage supply.

The present disclosure relates to a method for starting an AC electric motor comprising: applying, in response to receiving a control signal for starting the motor, a first active short profile to the motor during a first period of time; applying, after the first period of time, a first current profile to the motor during a second period of time; applying, after the second period of time, a second active short profile to the motor during a third period of time; optionally, applying, after the third period of time, a second current profile to the motor during a fourth period of time; applying, after the third period of time and / or after the fourth period of time, open-loop control of the motor based on a crank-up profile wherein a speed of the rotor of the motor is increased from essentially zero to a speed threshold during a fifth period of time.

The application belongs to the technical field of beam pumping unit, in particular to a power unit of beam pumping unit, which comprises a main reducer, an auxiliary reducer, a permanent magnet synchronous motor and a motor frequency converter controller, the auxiliary reducer comprises an auxiliary reducer driven large gear and an auxiliary reducer driving small gear which are engaged with each other, the auxiliary reducer driven large gear is installed on the input shaft of the main reducer, and the auxiliary reducer driving small gear is installed on the motor shaft of the permanent magnet synchronous motor; the auxiliary reducer driven large gear comprises a hub, a gear ring and a plurality of shock absorbing springs, the gear ring is sleeved on the hub and is in clearance fit, a plurality of rectangular slots are uniformly distributed in the circumferential direction at the contact position of the hub and the gear, and the shock absorbing springs are installed in the rectangular slots in a compressed state; the auxiliary reducer driven large gear and the auxiliary reducer driving small gear are both herringbone gears. The application has high transmission efficiency, high reliability, continuous adjustable pumping unit stroke, and can meet the needs of matching with full series of beam pumping units.

The present technology relates to soft-starts of alternating current (AC) motors, and particularly, to controlling a soft-start of an AC motor using a configuration of transistors and diodes. A system may include processing circuitry and gating circuitry. The gating circuitry may include a first transistor coupled to an AC voltage supply, a second transistor coupled to the first transistor and to an AC motor, a first diode coupled across current path terminals of the first transistor, and a second diode coupled across current path terminals of the second transistor. The processing circuitry may be configured to monitor voltage and current of the AC voltage supply and provide gating signals to the control terminals of the first and second transistors to control operations of the first and second transistors based at least in part on one or more desired firing angles and the voltage or current of the AC voltage supply.

The application provides a fractional-slot concentrated winding double-cage permanent magnet motor and a variable-pole switching method. The motor comprises a stator and a rotor. The stator comprises a stator winding design and a winding variable-pole switching method. Two groups of conducting bars are arranged on the outer circumferential side of the rotor. The two groups of conducting bars are connected with two end rings respectively to form two independent double-cage structures. Each conducting bar is arranged corresponding to a permanent magnet magnetic pole distributed in the circumferential direction of the rotor. Two groups of conducting bars are arranged on the outer side of the rotor. The two groups of conducting bars are connected with two end rings respectively to form two independent double-cage structures. The independent double-cage structure can not only filter specific harmonic magnetic motive force generated by the stator winding, but also greatly reduce the magnetic leakage phenomenon between the conducting bar and the permanent magnet magnetic pole, so that the blocking effect of the conducting bar on the permanent magnet magnetic circuit is reduced to the minimum, the utilization rate of the permanent magnet is improved, and the cost is reduced.

A method and apparatus for open loop starting of a three phase motor that reduces acoustic noise. During rotor alignment of the motor, a maximum level of phase current to the motor exists. After rotor alignment, open loop motor starting is performed during which the phase current has a first slope. At a selected time, such as when the frequency of the phase current reaches a first threshold, the phase current transitions to a second slope.

A starting method of a motor having a stator and a rotor, in which a field coil of the stator is started as Y-connection, in the case where the speed of the rotor is not within a predetermined range from a rated value within a predetermined time (t2), the field coil is switched to Δ-connection, and in the case where the speed of the rotor is within the predetermined range from the rated value, the field coil is switched to Y-connection.

To provide a motor control device capable of properly driving a motor at disconnection of one phase.SOLUTION: An ECU 40 that controls the drive of a motor having a three-phase motor coil 11, comprises a drive circuit 41 and a control part 50. The drive circuit 41 has switching elements 411 to 413. The control part 50 has: a drive control part 55 that controls on / off-operation of the switching elements 411 to 413 by feedback control based on a detection value of an encoder 13; and an abnormality determination part 52 that determines disconnection failures of the motor coil 11. The drive control part 55, when performing normal two-phase drive of driving a motor 10 by using normal two phases in a case where disconnection failures occur in one of three phases, performs energization by a pattern different from an energization pattern to an energization holding phase which is the energization phase at the start of the normal two-phase drive at least either at system startup and after motor stop, and then, performs a pre-start preparation process of energizing the energization holding phase.SELECTED DRAWING: Figure 2

A method for automatically setting an angular position sensor of a magnet rotor in relation to a stator of a synchronous machine, including an angle error compensator which adjusts the angles measured by the angular position sensor by an angular difference calculated by imposing a direct setpoint current equal to zero and by comparing a setpoint voltage with a quadrature return current, a direct return current resulting from a direct Park transform of current measured at the stator phase outputs and a rotor electrical speed, a predetermined value corresponding to the rotor magnet flux, and a quadrature inductance.

The present disclosure relates to a method for starting an AC motor, the method comprising: during a first time period, in response to receiving a control signal for starting the motor, applying a first active short circuit characteristic curve to the motor; applying a first current characteristic curve to the electric machine during a second time period after the first time period; applying a second active short circuit characteristic curve to the electric machine during a third time period after the second time period; after the third period of time, during a fifth period of time, an open-loop control of the electric machine is applied based on the starting characteristic curve, in which the rotor speed of the electric machine increases from substantially zero to a speed threshold.

A method for starting up a rotor of a single-phase claw-pole motor, wherein the claw-pole motor comprises a permanently excited rotor which executes a movement in a running direction in nominal operation, an electronically commutated stator and a Hall sensor for determining the relative rotor position, wherein the method comprises the steps of generating a pulse for moving the rotor in the direction opposite to the running direction by energizing a stator winding on the basis of an inverted Hall sensor signal; and starting up the rotor for movement in the running direction by energizing a stator winding on the basis of a Hall sensor signal.

Method for starting an inside-pole synchronous motor (10), wherein inductive reactive power is fed into at least one stator winding of the synchronous motor (10), wherein a three-phase current is fed into stator windings of the synchronous machine by means of a converter (24) and switching elements (S1 to S6) of the converter (24) are each switched with a switching angle greater than 180°, wherein the switching elements (S1 to S6) are controlled by a control device (38) in self-commutated operation according to an intermediate circuit clocking.

The utility model discloses a rapid low-power-consumption starting circuit of a permanent magnet AC synchronous motor. The rapid low-power-consumption starting circuit comprises a processing chip U1, first to twentieth resistors R1 to R20, first to third diodes D1 to D3, first to sixth capacitors C1 to C6, a first electrolytic capacitor EC1, a thermal protection module F1, an AC motor coil, a first voltage stabilizing diode ZD1 and a rectifier diode G, the control mode is simple, single-chip microcomputer power supply adopts a non-isolation resistance-capacitance voltage reduction scheme, and a motor control part adopts a single-chip microcomputer to control a conduction angle of a silicon controlled rectifier to realize motor power control. The circuit is simple, low in cost, safe and reliable, and the working state of the motor is known in real time through the simplest detection mode so as to be controlled. The scheme is very high in adaptability, can be matched with a motor with a starting coil, is also compatible with a unipolar motor which is lower in cost and is not provided with a starting coil, and is high in control scheme compatibility.

To reduce the number of parts in the motor drive system. [Solution] The ship's propulsion system comprises an electric motor and a motor drive device that drives the electric motor. The motor drive device has a power input terminal and a ground terminal connected to a ground line, and comprises a drive circuit that supplies power to the electric motor, an electrical resistance element, and a connection device. The connection device performs a first connection pattern in which the power input terminal is electrically connected to the power line via the electrical resistance element, and a second connection pattern in which the power input terminal is electrically connected to the ground line via the electrical resistance element.

A power tool includes a housing, a trigger, a motor coupled to an output member, and a motor drive circuit coupled to the motor. The power tool further includes a motor controller coupled to the motor drive circuit. The motor control circuit is configured to detect an input received from the sensor indicating that a wake-up operation is required. The motor control circuit is further configured to determine whether the power tool is in a sleep state and initiate a wake-up operation in response to receiving the input and determining that the power tool is in the sleep state.