77results about "Synchronous motors starters" patented technology

A method and system for operating a hybrid propulsion system, includes controllably providing a first power to a first bus and a first inverter, electrically coupling a first motor with a second inverter by way of a second bus, operably converting, by the second inverter, the first power received by the first inverter to a starting power adapted for starting the first motor, and increasing, by the second inverter, the starting power to match the first power received.

A power tool including a housing, and a motor drive circuit coupled to a 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 a sensor and determine whether the detected input exceeds a predetermined value. The motor control circuit is also configured to determine whether the power tool is in a sleep condition and initiate the wake-up operation in response determining that the detected input exceeds the predetermined value and determining that the power tool is in the sleep condition.

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.

A system, in one embodiment, may include a system includes a ground fault detection system (36). The ground fault detection system (36) includes a linear filter (72) configured to receive one or more signals from a static starter system (16) during operations of the static starter system (16) and to produce a linear filter output. The ground fault detection system (36) further includes a rectifier (74) configured to rectify the linear filter output and to produce a rectifier output, and a gain system (76) configured to multiply the rectifier output by a factor to produce a gain output. The ground fault detection system (36) additionally includes a fault indicator system (80) configured to indicate a ground fault based on the gain output, wherein the ground fault detection system (36) is configured to command an action based on the ground fault.

A boost circuit and method is described for supplying a boost voltage to a rotor of the electric machine, just as the electric machine is pulsed on, the boost voltage aids the rotor in quickly overcoming its start-up inductance, rapidly turn on the rotor. As a result, much faster transition times are realized each time the electric machine transitions from the off state to the on state at the start of a pulse. By reducing the transition time, the overall efficiency of the electric machine is significantly improved.

A synchronous machine (1) has a stator (3) and a rotor, wherein the rotor has a rotor winding (5), wherein a first power semiconductor (6) is provided for short circuiting the rotor winding (5), wherein the first power semiconductor (6) and the rotor winding form a first mesh (8). In a method for operating a synchronous machine (1), the rotor winding (5) is short circuited when the synchronous machine (1) is in an operating state, wherein a first short circuiter (6) is used for short circuiting, wherein the short circuiter (6) and the rotor winding (5) form a first mesh (8).

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.

A power conversion system includes an inverter and a controller configured to: measure a motor speed of an IPM motor in response to startup of the system; generate an inverter switch control signal to perform high frequency injection (HFI) in response to the motor speed being less than a threshold; determine a measured angle of the IPM motor during HFI; generate an inverter switch control signal to provide an injection current to the IPM motor during HFI; detect acceleration or deceleration of the IPM motor in response to the injection current; selectively determine an electrical angle as half of the measured angle or as 180 degrees plus half of the measured angle based on the detected acceleration or deceleration of the IPM motor; and generate an inverter switch control signal to drive the IPM motor to a reference frequency in a normal operation mode of the inverter in response to determining the electrical angle.

A motor driver having a start-up duty cycle modulation mechanism is provided. The motor driver includes a control circuit, a driver circuit, an output stage circuit and a current detector circuit. The control circuit outputs a start-up control signal having a plurality of waveforms. The driver circuit outputs a start-up driving signal according to the start-up control signal. The output stage circuit operates to output a motor start-up signal to a motor according to the start-up driving signal for starting up the motor. The current detector circuit detects a current of the motor. The control circuit, according to the detected current of the motor, modulates duty cycles of the plurality of waveforms of the start-up control signal.

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 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.