Abstract: An electronic control unit includes: inverter circuits of first and second systems driving a multiphase motor with coil sets on a coil set basis; first and second phase potential detecting circuits detecting potentials of at least one phase of current supply paths from the inverter circuits to the coil set; and a diagnosis apparatus detecting a failure based on potentials detected by the first and second phase potential detecting circuits. Under condition that the inverter circuit of the first system turns ON the upper or lower arm switching element corresponding to one phase of the first coil set and turns OFF the other one so that the inverter circuit of the second system has a high-impedance output, when the potential detected by the second phase potential detecting circuit corresponds to an output potential of the inverter circuit of the first system, the diagnosis apparatus determines that a short-circuit failure occurs.

Abstract: To provide a controller and a control method for an electric motor including plural energization systems each composed of an inverter and coils corresponding to plural phases. The controller performs first diagnosis processing for detecting an abnormality in each system under energization control, and second diagnosis processing for detecting an abnormality in each system not under energization control. When the first diagnosis processing detects an abnormality in one system and the second diagnosis processing detects no abnormality in the one system or when the first diagnosis processing detects an abnormality in one system to thereby stop energization control over the one system and in such a state, an abnormality is detected in another system, the energization control over the one system is restarted to drive the electric motor. It is therefore possible to avoid stopping output from a normal system when some of the systems have an abnormality.

Abstract: The present invention relates to an electric motor drive device where a first inverter and a second inverter both supply power to one electric motor and to a control method for the electric motor drive device. A control unit for controlling an output of each inverter increases an output of the inverter of which a drive control system has first completed an initial diagnosis, ahead of the other inverter. If either inverter is about to overheat, the control unit decreases an output of the inverter that is about to overheat while keeping or increasing an output of the other inverter having the normal temperature.

Abstract: In order to provide a motor driving circuit in which a portion corresponding to a failed phase can be separated while miniaturization and lower costs are achieved, a motor driving circuit for driving a motor includes: a second driver circuit for driving a driver circuit which supplies a drive current corresponding to one phase of a multiphase motor having three or more phases, to the multiphase motor; and an electrical circuit which includes a plurality of electrical components and switches a connecting relation between the electrical components according to an operation mode designated from outside the motor driving circuit, thereby providing a circuit function corresponding to the operation mode.

Abstract: A stress mitigation region is formed in which a predetermined number of stress mitigation holes penetrating through a wiring are disposed is formed in a proximity of a bonding portion of an electronic component via which the electronic component is bonded to the wiring with an electrically conductive bonding agent. Accordingly, even if a stress is generated in the wiring due to a heat, the stress mitigation holes are deformed so that the stress acted upon the electrically conductive bonding agent becomes small and a generation of cracks in the electrically conductive bonding agent can be suppressed. In addition, the stress mitigation holes are made circular so that concentrations of a current and the stress can be reduced and the generation of the cracks in the wiring can be suppressed.

Abstract: The present invention relates to a drive control apparatus for an electric motor and a control method thereof. In the present invention, the generation of electric brake is suppressed while protecting a semiconductor relay from excessive surge voltage. The drive control apparatus is configured to include: a drive circuit for controlling the drive of the electric motor; a semiconductor relay arranged on a drive line between the drive circuit and the electric motor to cut off current supply from the drive circuit to the electric motor; and an active clamp circuit for turning on the semiconductor relay when a potential difference between the drive circuit side and the electric motor side of the semiconductor relay is greater than or equal to a predetermined value.

Abstract: To provide a controller and a control method for a motor equipped with a plurality of energization systems each including a coil set of coils corresponding to a plurality of phases and an inverter for outputting a current to each of the phases in the coil set. The controller stops the inverter of a first energization system if the total phase current in the first energization system is an outlier. During a predetermined period after stopping the inverter of the first energization system, even if the total phase current in any other energization system is an outlier, the controller continues to operate the inverter of the other energization system. This makes it possible to continue to operate the inverter of a normal energization system as required as possible while stopping the inverter of an energization system having an abnormality such as a short-circuit or short-to-ground.

Abstract: Provided is a control device for an electric motor which includes multiple energization systems each including an inverter and coils corresponding to different phases, and which generates a steering assist force in an electric power steering system. Control device diagnoses whether any of inverters 1A and 1B fails, and, when either of the inverters is diagnosed as having failed, reduces the output ratio of the failing inverter to 0% while increasing the output ratio of the normally operating inverter to 100% so as to prevent a drop in the total output from all the inverters after the failure-positive diagnosis. If steering operation is performed after the failure-positive diagnosis, control device performs overheat protection processing for gradually lowering the limit value for the total output from all the inverters in accordance with the sensed temperature of the normally operating inverter.

Abstract: An object of the present invention is to realize a feedback control apparatus and an electrically driven power steering apparatus capable of safely continuing control operation even in the event of the occurrence of a soft error. A controller 202 of the present invention determines a d-axis target voltage Vd and a q-axis target voltage Vq, which are control values for controlling an output value of the electrically driven power steering apparatus on the basis of a d-axis error signal ?Id and a q-axis error signal ?Iq, which are input values. In this processing, in a period before the occurrence of the soft error, the controller 202 determines the d-axis target voltage Vd and the q-axis target voltage Vq by means of PID control that uses a current input value and a past input value. In a period after the occurrence of the soft error, the d-axis target voltage Vd and the q-axis target voltage Vq are determined by means of P control that uses a current input value but does not use a past input value.

Abstract: To provide controller and control method for an electric motor including plural energization systems composed of an inverter and coils corresponding to plural phases. According to the present invention, if any abnormality is detected in one energization system being energized through first diagnosis processing, second diagnosis processing is executed on the energization system having the abnormality detected, which is switched to an unenergized state. Then, if the second diagnosis processing reveals occurrence of a short-circuit, a control gain of a normal energization system is lowered. In addition, a threshold used in the first diagnosis processing on the normal energization system is changed so as to make it difficult to detect an abnormality, hereby keeping the energization control on the normal energization system. Hence, if a short-circuit occurs in at least one of the energization systems, it is possible to avoid stopping the output from the normal energization system.

Abstract: To provide a controller and a control method for a motor equipped with a plurality of energization systems each including a coil set of coils corresponding to a plurality of phases and an inverter for outputting a current to each of the phases in the coil set. The controller stops the inverter of a first energization system if the total phase current in the first energization system is an outlier. During a predetermined period after stopping the inverter of the first energization system, even if the total phase current in any other energization system is an outlier, the controller continues to operate the inverter of the other energization system. This makes it possible to continue to operate the inverter of a normal energization system as required as possible while stopping the inverter of an energization system having an abnormality such as a short-circuit or short-to-ground.

Abstract: To provide drive controller and control method for an electric motor including plural energization systems composed of an inverter and coils corresponding to plural phases. The controller includes: a current detecting unit for detecting currents between the coils and output points of the inverter or between the coils and a connection point between the coils; an inverter setting unit for controlling an inverter of the energization system involving abnormal energization into a predetermined condition; a torque detecting unit for detecting a torque generated in the energization system involving the abnormal energization based on a current in the energization system, which is detected by the current detecting unit; and a control unit for controlling a normal inverter based on the torque detected by the torque detecting unit. This configuration enhances the performance of controlling the electric motor in case a braking torque is generated due to abnormal energization.

Abstract: To provide controller and control method for an electric motor including plural energization systems composed of an inverter and coils corresponding to plural phases. According to the present invention, if any abnormality is detected in one energization system being energized through first diagnosis processing, second diagnosis processing is executed on the energization system having the abnormality detected, which is switched to an unenergized state. Then, if the second diagnosis processing reveals occurrence of a short-circuit, a control gain of a normal energization system is lowered. In addition, a threshold used in the first diagnosis processing on the normal energization system is changed so as to make it difficult to detect an abnormality, hereby keeping the energization control on the normal energization system. Hence, if a short-circuit occurs in at least one of the energization systems, it is possible to avoid stopping the output from the normal energization system.

Abstract: The present invention relates to drive controller and control method for an electric motor equipped with coil sets corresponding to plural phases. The drive controller and control method for an electric motor of the present invention control, in case of abnormal energization that a potential of the coil reaches a power supply potential or a ground potential, at least one of a high-potential side switching element and a low-potential side switching element in a failed energization system involving the abnormal energization into ON state so as to reduce a phase-to-phase impedance and also, detect a braking torque generated in the energization system involving the abnormal energization to control an output of a normal energization system not suffering from the abnormal energization based on the detected braking torque.

Abstract: The present invention relates to an electric motor drive device where a first inverter and a second inverter both supply power to one electric motor and to a control method for the electric motor drive device. A control unit for controlling an output of each inverter increases an output of the inverter of which a drive control system has first completed an initial diagnosis, ahead of the other inverter. If either inverter is about to overheat, the control unit decreases an output of the inverter that is about to overheat while keeping or increasing an output of the other inverter having the normal temperature.

Abstract: An object is to prevent the motor from carrying out a regeneration braking operation even if any of phase output lines is short-circuited to VB or GND in addition to a short-circuit failure occurring in a MOSFET of an inverter. The semiconductor switching devices of a power conversion apparatus each have a diode that is coupled in parallel to each of the semiconductor switching devices. At least one of the diodes are connected in a direction opposite to the direction in which other diodes are oriented on a current path between the power supply and the ground. Further, at least one of diodes is connected in a direction opposite to the direction in which other diodes are oriented on a current path between the output of the motor and the power supply and on a current path between the output of the motor and the ground.

Abstract: The present invention relates to a motor drive device having a drive circuit for driving a power supply relay and a phase relay providing a fail-safe function. The motor drive device includes: an inverter circuit for supplying electric power to an electric motor; a power supply relay provided on a power supply line for supplying electric power from a power supply to the inverter circuit; a phase relay provided on a drive line between the inverter circuit and the electric motor, and constituted by a semiconductor switching element; and a drive circuit connected to the phase relay and the power supply relay. The phase relay and the power supply relay share the same drive circuit, and the phase relay and the power supply relay are driven simultaneously by a drive signal output from the drive circuit.

Abstract: The present invention relates to a drive control apparatus for an electric motor and a control method thereof. In the present invention, the generation of electric brake is suppressed while protecting a semiconductor relay from excessive surge voltage. The drive control apparatus is configured to include: a drive circuit for controlling the drive of the electric motor; a semiconductor relay arranged on a drive line between the drive circuit and the electric motor to cut off current supply from the drive circuit to the electric motor; and an active clamp circuit for turning on the semiconductor relay when a potential difference between the drive circuit side and the electric motor side of the semiconductor relay is greater than or equal to a predetermined value.

Abstract: The objective of the present invention is to improve reliability in a solder connection portion between an electronic component and a wiring pattern. A pair of wiring patterns (31A and 31B) are formed on a circuit wiring board (30) with an insulation layer (37) therebetween. Each wiring pattern (31A and 31B) has a land (33a or 33b) and a wiring portion (34a or 34b) that is narrower than the land. By way of solder (42), a chip component (41) is soldered to the lands (33a and 33b). The x (width) direction center (Xa) of each connection portion (53) where a respective wiring portion (34a or 34b) is connected to a respective land (33a or 33b) is disposed at a position that is outside of both the region in which a region of predetermined width (Wc) of the chip component (41) extends in the x (longitudinal) direction, and the region in which a region of predetermined length (Lc) of the chip component (41) extends in a y (transverse) direction.

Abstract: In order to provide a motor driving circuit in which a portion corresponding to a failed phase can be separated while miniaturization and lower costs are achieved, a motor driving circuit for driving a motor includes: a second driver circuit for driving a driver circuit which supplies a drive current corresponding to one phase of a multiphase motor having three or more phases, to the multiphase motor; and an electrical circuit which includes a plurality of electrical components and switches a connecting relation between the electrical components according to an operation mode designated from outside the motor driving circuit, thereby providing a circuit function corresponding to the operation mode.