Abstract: A system for protecting an inrush resistor by determining whether an inrush relay connected in parallel with the resistor properly closes. A differential amplifier connected across the resistor produces an output signal that is proportional to the differential voltage. A control circuit determines whether the relay is open based on the output signal, and if the relay is open and the motor is running, takes remedial action to protect the inrush resistor. Alternatively, the amplifier is replaced with a slow response filter that produces an output signal that is a delayed version of a bus voltage. The control circuit determines the difference between the bus voltage and the output signal, and if it exceeds a predetermined value and the motor is running, takes remedial action to protect the inrush resistor. Remedial action may include shutting off the motor or restarting the motor to confirm improper behavior of the relay.

Abstract: A piezoelectric debris sensor and associated signal processor responsive to debris strikes enable an autonomous or non-autonomous cleaning device to detect the presence of debris and in response, to select a behavioral mode, operational condition or pattern of movement, such as spot coverage or the like. Multiple sensor channels (e.g., left and right) can be used to enable the detection or generation of differential left/right debris signals and thereby enable an autonomous device to steer in the direction of debris.

Abstract: A brushless motor includes a rotor, a plurality of sets of stator windings, a position detection assembly, a MOSFET assembly, an inductance detection module and a main control module that controls them. The position detection assembly has a plurality of detection elements for detecting a position of the rotor and a position detection module for receiving signals fed back from the detection elements with the position detection module being electrically connected to the main control module and feeding back the positional information of the rotor thereto. The main control module alternatively switches between the position detection assembly and the inductance detection module to detect the position of the rotor.

Abstract: A system and method are provided for estimating temperature of a rotor of a motor configured to calculate temperature of the rotor using an actual measured data-based thermal model (thermal impedance model) and an energy loss model, and to estimate temperature of the rotor using the calculated temperature variation of the rotor. The method includes calculating, by a controller, an energy loss of the motor using driving conditions of the motor. The controller is also configured to calculate a temperature variation of the rotor in a predetermined reference temperature using the calculated energy loss and thermal resistances of the rotor and a stator of the motor. Further, the controller is configured to estimate a rotor temperature in the predetermined reference temperature using the temperature variation of the rotor.

Abstract: A control device and a control method can improve a voltage utilization ratio of an inverter for a green car, in which an input DC voltage of the inverter is modulated by a maximum amount into an output AC voltage of the inverter by changing the output AC voltage incapable of being linearly output into a voltage capable of being linearly output. The control method includes steps of: generating a two-phase current command having two phases of a first current command and a second current command; generating a two-phase voltage command having two phases of a first voltage command and a second voltage command; generating a three-phase pole voltage command; modulating the three-phase pole voltage command into a linear output voltage capable of being linearly output; and calculating a voltage gain value, using the two-phase voltage command and an input DC voltage of the inverter.

Abstract: A motor drive includes an electromagnetic connector for connecting an alternating current (AC) power source to an AC/DC conversion unit or disconnecting therefrom, a DC link unit, a DC/AC conversion unit for converting smoothed direct current voltage to AC voltage, a DC link voltage detection unit for measuring voltage of the DC link unit, and a control unit. The control unit includes a time measurement unit for measuring elapsed time since switching by the electromagnetic connector, and a welding judgment unit for judging that the electromagnetic connector is welded, provided that the difference between voltage between terminals of the DC link unit after charging the DC link unit and voltage between the terminals of the DC link unit after predetermined time has elapsed since disconnecting the AC power source from the AC/DC conversion unit, after the charge of the DC link unit, is less than a predetermined voltage level.

Abstract: A method for suppressing a speed fluctuation of a permanent magnet synchronous motor is provided in the present disclosure, including: obtaining a target speed ?_ref, a feedback speed, a fluctuation speed ??, a q-axis inductance Lq and a permanent magnet flux linkage ?f of the permanent magnet synchronous motor; performing a PI adjusting on ?? to obtain a q-axis reference current Iq_ref, and obtaining a q-axis target voltage U*q according to Iq_ref, ?_ref, ?? and ?f; performing a PI control on a q-axis actual voltage according to U*q to obtain a q-axis compensation current Iq_add; obtaining a d-axis target voltage U*d according to Iq_ref, Iq_add, ?_ref, ?? and Lq; performing a PI control on a d-axis actual voltage according to U*d to obtain a d-axis compensation current Id_add; superposing Iq_add and Iq_ref to perform a feedforward compensation on a q-axis current and superposing Id_add and the d-axis reference current to perform a feedforward compensation on a d-axis current.

Abstract: A method includes driving a component in an electromagnetic actuator back and forth during one or more cycles of the actuator, where the actuator includes a voice coil. The method also includes identifying a back electromotive force (EMF) voltage of the voice coil during at least one of the one or more cycles. The method further includes determining whether a stroke of the component is substantially centered using the back EMF voltage of the voice coil. In addition, the method includes, based on the determination, adjusting one or more drive signals for the voice coil during one or more additional cycles of the actuator. Determining whether the stroke of the component is centered could include determining whether the back EMF voltage of the voice coil is substantially maximized or determining whether times between extremes in the back EMF voltage are substantially equal.

Abstract: The invention relates to a drive circuit for an electric motor having an aerodynamic bearing of the motor shaft, wherein the drive circuit comprises at least one storage means for storing electrical energy by which the electric motor can be fed with electrical energy on a failure of the supply voltage or DC-link voltage to obtain a minimum speed of the motor shaft required for the air support at least at times.

Abstract: [Object] To effectively improve torque of a motor, the maximum rotation rate in driving with no load, and output at a high rotation rate, while suppressing torque ripple, noise, or vibration of the motor. [Solution] A brushless motor 301 has an armature iron core 310 wound with armature windings including plural winding sets 311 and 312 each of which includes multi-phase windings. Voltage application means 302 applies voltages to the plural winding sets. Control means 303 calculates a voltage command for the plural winding sets, and controls the voltage application means based on the voltage command. The control means 303 controls the voltage application means 302 so that induced voltages generated in the plural winding sets by rotation of the brushless motor have a trapezoidal waveform and a phase difference between the voltages for the plural winding sets becomes a value that reduces torque ripple caused by the induced voltages.

Abstract: There are disclosed herein various implementations of a method and a system enabling operation of a motor in reverse. Such a method includes applying a first drive signal to begin rotating the motor in a reverse direction, the first drive signal being applied for a predetermined period of time. The method also includes using a position sensor signal for the motor to control motor drive in the reverse direction when the motor reaches a predetermined reverse speed, and operating the motor in the reverse direction.

Abstract: A power source device includes a power source body including first and second secondary batteries and an inverter. When the power source connection status is switched from parallel to serial statuses, the motor generator is operated as a motor and the power source connection status is switched to a single second power source status, after switching to the first connection status in which the power source body and the first inverter are connected, the first motor generator operates as a motor, and power source connection status is switched to a single second power source status, and the inverter connection status is switched to a second connection status in which the power source body in the single second power source status and the inverter are connected.

Abstract: Weighing system (FIG. 3, FIG. 6) to weigh items, parcels and the like while they are moving, for example, on a conveyor. A servo amplifier (14) and servo controller (20) are arranged to drive a servo motor in a feedback (15) configuration, and acquire torque sensing signals (17) responsive to commanded acceleration of the conveyor while the item(s) are on board. Preferably, constant acceleration of the item(s) is realized during one or more measurement intervals, and mass is derived by a processor (30) based on the measurement data (FIG. 5). Other embodiments are described for weighing granular and slurry materials (FIG. 7) and for weighing multiple, potentially overlapping, parcels in motion (FIG. 8).

Abstract: The claimed subject matter includes techniques for controlling lines. An example method includes receiving power at a motor to rotate a control surface and a line brace. The method also includes receiving programmed movements at a control circuit. The method further includes receiving a controlled force based on the programmed movements to arrange a skate in a predetermined position along a skate track in a skate surface. The method also includes rotating the control surface to cause a peg ramp on the control surface to move a peg in the skate towards a wedge fixed to a line. The method further includes causing the line to move to a new position along the direction of the skate track via a force of the peg against the wedge.

Abstract: In a driver, a clamping module executes a clamping task that clamps an on-off control terminal voltage to be equal to or lower than a clamp voltage for a predetermined time during charging of the on-off control terminal of the switching element. The clamp voltage is lower than an upper limit of the voltage at the on-off control terminal of the switching element. A measuring module measures a parameter value correlated with a sense current correlated with a current flowing between input and output terminals of the switching element. A limiting module discharges the on-off control terminal to limit flow of the current between the input and output terminals if the value of the parameter exceeds a threshold. A setting module variably sets a length of the predetermined time as a function of the parameter value during charging of the switching element's on-off control terminal.

Abstract: A multi-phase electric circuit including an electric machine and an inverter, wherein machine encompasses a rotor connected to the inverter via at least two brushes for each phase, wherein each of the brushes of each phase is connected to the inverter via a separate brush line.

Abstract: A positioning control device according to an embodiment includes an amplifier that includes a converter that rectifies and outputs an AC power supply to bus-bars; a smoothing capacitor that smoothes an output of the converter and generates a bus voltage; a regenerative resistance and a regenerative transistor; an inverter that supplies a drive current; and a command generation unit that generates a position command value for positioning control of a mechanical load in accordance with a command pattern. The inverter is connected between the bus-bars and supplies the drive current. The command generation unit acquires a regenerative-power-amount estimated value and an energy value storable in the smoothing capacitor; and on the basis of a result of a comparison between these values, it decides whether to use the position command value on the basis of the command pattern.

Abstract: A method and system for computing a motor speed and a rotor position using a hall sensor are provided. The method improves precision for computing the speed of the motor rotating at a high speed and the rotor position using the hall sensor based on configurations, such as the hall sensor mounted in the motor as a position sensor, a motor controller configured to receive a signal of the hall sensor to operate the motor, and a microcomputer configured to store a time when the motor controller senses the timing of a change in the signal of the hall sensor.

Abstract: A control system included in a speed selector connected by output phases to a synchronous electric motor, the synchronous electric motor being controlled according to a control law implemented by the speed selector. A first speed of the synchronous electric motor is determined by a first speed estimator. A second speed estimator is used to determine a second speed of the synchronous electric motor. The system includes a signal generator module configured to apply, to the output phases, voltages taking account of a non-constant current signal. The second speed estimator is configured to recover the current response on the output phases, to deduce therefrom the second speed of the synchronous electric motor.

Abstract: Circuits and methods for driving ERM motors are disclosed herein. An embodiment of the circuit includes an input, wherein an input signal is receivable at the input and a back EMF signal. The circuit operates in a closed loop mode when the back EMF signal is less than a lower threshold value and the difference between the value of the input signal and the back EMF signal indicates that the velocity of the motor needs to increase. The circuit operates in an open loop mode when the back EMF signal is greater than a high threshold value and the difference between the value of the input signal and the back EMF signal indicates that the velocity of the motor needs to increase.