132results about "Synchronous motors starters" patented technology

The invention provides a double-squirrel-cage permanent magnet motor with a fractional slot concentrated winding and a pole-changing switching method, the motor comprises a stator and a rotor, the stator comprises a stator winding design and a winding pole-changing switching method, and two groups of conducting bars are arranged on the outer circumferential side of the rotor. The two groups of conducting bars are respectively connected with the two end rings to form two independent double-squirrel-cage structures, and each conducting bar corresponds to a permanent magnet steel magnetic pole distributed in the circumferential direction of the rotor. Two groups of conducting bars are arranged on the outer side of the rotor, and the two groups of conducting bars are respectively connected with the two end rings to form two independent double-squirrel-cage structures. The independent double-squirrel-cage structure not only can filter specific-order magnetomotive force harmonics generated by a stator winding, but also greatly reduces the magnetic leakage phenomenon due to the position relation between the conducting bars and the magnetic poles of the permanent magnets, so that the blocking effect of the conducting bars on a permanent magnetic circuit is reduced to the minimum, the utilization rate of the permanent magnets is improved, and the cost is reduced.

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 variable frequency starter generator (VFSG) system includes a VFSG having a start mode and a generate mode, a permanent magnet generator (PMG) and a main generator section and an exciter section. The system also includes a controller electrically connected to the VFSG. The controller flow start mode three phase electrical power from aircraft power to the exciter of the VFSG in the start mode and flows single phase electrical power to the exciter of the VFSG in the generate mode. The controller includes: an input active rectifier that receives input AC power and converts it to DC power and provides it to across a positive rail and negative rail; an output inverter coupled to an output of the input active rectifier; and one or more line inductors connected along one or both of the positive rail and negative rail between the input active rectifier and the output inverter.

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.

A current sourced control topology is provided for an AC motor controller that eliminates many of the problems associated with prior art motor controllers that use voltage source inverter (VSI) technologies. By controlling the output of AC current sources such as synchronously controlled down converters to directly drive each motor phase, significant efficiency gains and a reduction in electromagnetic interference is achievable.

The invention relates to a method for starting a speed-controlled electric motor of a centrifugal pump, wherein the centrifugal pump has at least one impeller driven by the electric motor, which in regular pump operation rotates at a positive speed for the intended conveying of a pumped medium from a suction side to a pressure side of the centrifugal pump, and wherein the speed control of the motor operates without a sensor and without means for determining the position of the rotor, characterized in that, before the centrifugal pump is started, it is detected by means of a current measurement whether and in which direction the impeller is set in rotation by an external flow.and, upon detection of a positive rotational speed generated by the external flow, the motor is controlled according to a speed ramp starting with a target speed of zero, and upon detection of a negative rotational speed generated by the external flow, the motor is controlled according to a speed ramp starting with a negative target speed.

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.

The invention relates to a method for starting a rotational speed-controlled electric motor of a centrifugal pump. The centrifugal pump has at least one impeller which is driven by the electric motor and which rotates at a positive rotational speed during a regular pump operation in order to pump a pumped medium from a suction side to a pressure side of the centrifugal pump in an intended manner, and the rotational speed of the motor is controlled in a transmitter-free manner without means for determining the position of the rotor. The invention is characterized in that prior to starting the centrifugal pump, a current measurement is used in order to detect whether the impeller is being rotated by an external flow and if so, in which direction. If a positive rotational speed produced by the external flow is detected, the motor is actuated according to a rotational speed ramp beginning with a rotational speed target value of null, and if a negative rotational speed produced by the external flow is detected, the motor is actuated according to a rotational speed ramp beginning with a negative rotational speed target value.

To provide a controller for a multi-phase AC motor having multiple coils.SOLUTION: A controller has: multiple AC current sources each of which is connected to one of multiple coils to supply sine-wave current to one of the multiple coils; and a control logic which is connected to the multiple AC current sources and forms a sine-wave voltage reference to control the action of an AC induction motor in input to each of the AC current sources driving the coils connected to each of the AC current sources by using the sine-wave AC current of a specified phase, a variable frequency and a variable amplitude.SELECTED DRAWING: Figure 2

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.

To provide a motor start method capable of improving the certainty of starting even when inertia is large.SOLUTION: In a start method of a motor including a stator and a rotor, a field coil of a stator is started as a Y connection, and when the speed of the rotor does not fall within a predetermined range from the rated value within a predetermined time (t2), the field coil is switched to the Δ connection, and when the speed of rotor is within a predetermined range from the rating, the field coil is switched to the Y connection.SELECTED DRAWING: Figure 4

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.