Abstract: A power controller alleviating change of braking feeling caused by reduced regenerative braking force is provided. Energy generated by regenerative braking is used for charging a capacitor. The charging power P(C) is calculated and whether P(C) has reached a maximum value WMAX of predetermined limit control value WIN(C) or not is determined. If P(C) is determined to have reached WMAX WIN(C) is regulated to be smaller from that time point.

Abstract: An ECU executes a program including the steps of: calculating regenerative power value P based on a brake pressure (S100); calculating limit charging power WIN(B) to a battery (S102); calculating limit charging power WIN(C) to a capacitor (S104); when it is determined that regenerative power value P is larger than the sum of WIN(B) and WIN(C) (YES at S106), estimating (S108) that a large regenerative energy sufficient to fully charge the capacitor even if the battery is charged with priority would be generated; and transmitting a control signal (S110) to set output voltage of a boost converter to be not higher than the voltage of the capacitor so as to charge the battery with priority.

Abstract: A load-lifting apparatus has one or more prime power sources, one or more energy storage systems and regenerative braking. Regenerative energy is recovered when the load-lifting apparatus lowers its load. The elements of the prime power sources, energy storage devices and electrical components may be distributed to provide stability for the load-lifting apparatus. The general power architecture and energy recovery method can be applied to cranes, rubber-tired gantry cranes, overhead cranes, mobile cranes, ship-to-shore cranes, container cranes, rail-mounted gantry cranes, straddle carrier cranes and elevators. In such an architecture, the energy storage system helps alleviate the power rating requirement of the prime power source with respect to the peak power requirement for lifting a load.

Abstract: A two-phase electric motor includes first and second coil groups and a magnet group. In the magnet group, N poles and S poles are disposed alternatively opposite the first and second coil groups. The first and second coil groups are disposed at positions that are out of phase with each other by an odd multiple of ?/2 in electrical angles. The coils of the first and second coil groups have substantially no magnetic material cores, and the electric motor has substantially no magnetic material yoke for forming a magnetic circuit.

Abstract: An Electric Vehicle is equipped with a plurality of Electric Motors, with at least one motor optimized for operation in one vehicle speed range and at least another motor optimized for operation in a different vehicle speed range. Under acceleration, at any instance in time a majority proportion of power is directed to the motor that is best optimized for the current vehicle speed. Under deceleration, at any instance in time a majority proportion of regenerative braking is drawn from the motor that is best optimized for the current vehicle speed. Motors may be mechanically coupled to the same driven axle or to different driven axles.

Abstract: An upper limit value setting unit of a control device conducts integration on the change in battery power, and determines whether the integrated value is lower than a preset first threshold value (negative value). When determination is made that the integrated value is lower than the first threshold value, and the battery power difference is lower than the second threshold value (negative value), the upper limit value setting unit sets Vup2 that is lower than the general Vup1 as the upper limit value of the inverter input voltage command.

Abstract: An electric powered vehicle according to the present invention comprises a battery, an electric power converting device, an electric motor, a drive wheel, a control part, an accelerator, a brake, and a rotation sensor. The control part detects the velocity using the rotation sensor. When a first velocity threshold is Vt1, and a second velocity threshold is Vt2, and when the thresholds are Vt1<Vt2, regenerative control is permitted in the case where a running velocity increases to or above the second velocity threshold, and the regenerative control is prohibited in the case where the running velocity falls below the first velocity threshold.

Abstract: An electrical device includes a plurality of single-phase power cells electrically connected to receive power from a source and deliver power to a load. The single-phase power cells include a first rank of regenerative power cells and a second rank of non-regenerative power cells. Each non-regenerative power cell may include an inverter bridge, a capacitor set electrically connected across terminals of the inverter bridge, and a three-phase bridge rectifier electrically connected across the terminals. The non-regenerative power cells may provide reactive power when the plurality of cells are used for braking of a motor.

Abstract: The regenerative torque shifter is a system for electric/hybrid electric vehicles that includes a driver-operated control device mounted in the vehicle and a control unit linked to a motor controller. The driver sets a level of regenerative braking desired by manipulating the control device. Based on output from the control device, the control unit directs the motor controller to apply a corresponding level of regenerative braking action by varying the amount of load seen by the motor.

Abstract: An energy recovery system including a device that produces a magnetic field adapted for mounting to a vehicle and a stationary conductor adapted for placing in or adjacent the path of the vehicle wherein the magnetic field induces current to flow through the conductor when the vehicle moves past the conductor. The vehicle may be an automobile, a truck, a train, or other type of vehicle. When used in conjunction with a train, the energy recovery system may be designed to recover energy from non-locomotive train cars in addition to, or in lieu of, the train locomotive. Kinetic energy that would otherwise be lost to heat energy through the application of brakes to the non-locomotive cars can thereby be recovered and re-used.

Abstract: During braking, lower limits are set based on an input limit of a battery and a brake pedal position, and the set lower limits limit regenerative torques output from motors. This prevents an output of an excessive braking force and torque shock caused by a hydraulic brake being not able to follow sudden changes in the regenerative torques output from the motors when the vehicle speed is reduced.

Abstract: A control device includes a drive control unit that performs control for driving the electromagnetic coil, and a regeneration control unit that performs control for regenerating power from the electromagnetic coil. The drive control unit includes an excitation interval setting unit that sets an excitation interval and a non-excitation interval such that voltage is applied to the electromagnetic coil during the excitation interval while not applied to the electromagnetic coil during the non-excitation interval. The excitation interval has a symmetrical shape whose center corresponds to a ?/2 phase point of the induced voltage waveform, and the non-excitation interval has a symmetrical shape whose center corresponds to the ? phase point of the induced voltage waveform.

Abstract: When surplus power not charged to an electric storage is generated at the time of regenerative braking of a vehicle, a voltage is generated across first and second neutral points using a zero-voltage vector each of first and second inverters and the generated surplus power is consumed by a resistance connected across the first and second neutral points. The voltage generated across the first and second neutral points is calculated in accordance with the surplus voltage, using a resistance value of the resistance.

Abstract: A vehicle drive device includes an engine (200), a motor generator (MG1) driven by the engine (200) and generating power, a motor generator (MG2) driving the vehicle and generating electric power at the time of regenerative braking, a battery (B) capable of exchanging power to/from the motor generators (MG1, MG2), a temperature sensor (10) detecting temperature of the battery (B), and a controller (30) controlling the motor generators (MG1, MG2). If reduction in a required driving torque value of the motor generator (MG2) is detected, the controller changes start timing of regenerative braking by the motor generator (MG2) dependent on an output of the temperature sensor (10).

Abstract: A vehicle or watercraft regeneration system includes at least one electric motor capable of generating electricity and a controller for the at least one motor; wherein the controller to optimize the efficiency of the regeneration. The controller can optimize efficiency by including comprises circuitry for biasing the electric motor during regeneration. Also provided is a regeneration system that further comprises an electricity storage device such as a battery, a capacitor, an electrolysis unit that generates hydrogen from water, and a flywheel. In addition, an efficiency enhancing system for a watercraft or vehicle includes at least one electric motor capable of generating electricity; a controller for the at least one motor; and an electrical connection between the at least one motor and the controller, where in the controller adjust one or more magnetic fields of the electric motor during regeneration to optimize the efficiency of the regeneration.

Abstract: A control system and method for a hybrid electric vehicle. One example control system includes a current calculating module to calculate a current, the current being at least one of a current to drive a motor of the vehicle and a current generated by the motor, and a feed controller to selectively implement a first mode when the calculated current is below a predetermined current value and to selectively implement a second mode when the calculated current is more than the predetermined current value, wherein either the first feed circuit or the second feed circuit is used in the first mode and both the first feed circuit and the second feed circuit are used in the second mode.

Abstract: A control apparatus for controlling a rotational electric machine and a driving apparatus for a vehicle that include an AC motor that rotates wheels and is driven by a power supplied from a battery, an instant variation detecting unit provided in a motor controller that detects a instant variation of a current or voltage of the battery, and a current command operating unit that changes a current command to be sent to the AC motor such that an internal loss of the AC motor is increased by using an internal-loss-increase-use Id·Iq table.

Abstract: A system for capturing regenerative energy includes a battery configured to provide power for a traction motor and other operations of a vehicle and a capacitor connected to the battery. An auxiliary motor is configured to operate as a generator during a regenerative energy operation. The system further includes a controller configured to direct the regenerative energy to the capacitor during the regenerative energy operation and discharge the capacitor to provide power to the traction motor or for the other operations of the vehicle.

Abstract: A electric motor is disclosed in which torque ripple is reduced. The electric motor includes a single motor shaft. Rotors are disposed so as to be mutually offset in phase, and the rotors are secured to the motor shaft. Stators are arranged so as to individually correspond to the rotors, and the stators are disposed so as to be matched in phase. The phases of torque ripple generated in each motor unit, which is comprised of a combination of a single rotor and a single stator, are offset.

Abstract: A system and a method that provides fuel cell and energy storage hybrid-electric propulsion and control for a heavy-duty vehicle over 10,000 pounds GVWR. Power output is supplied from a fuel cell system to a high-power intermediate DC bus through a fuel cell DC/DC converter. Power output is supplied from an energy storage system to the high-power intermediate DC bus through a separate energy storage fuel cell DC/DC converter. The received power is combined on the high-power intermediate DC bus to create a stable voltage. The stable voltage from the high-power intermediate DC bus is supplied to one or more electric motors/generators to accelerate the heavy duty vehicle.

Abstract: A method and apparatus are disclosed for controlling a hybrid energy system including a method of storing energy within a hybrid energy system. The hybrid energy system includes a traction load and a first energy consuming system configured to maintain a first criteria within a first operating range. The method includes receiving energy into the hybrid energy system from the traction load and distributing a first energy to the first energy consuming system when the first criteria is within the first operating range.

Abstract: Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control system having a drive source with an electric motor, a drivee, a control circuit having a drive control circuit of the motor and a regenerative control circuit, and a detection unit for detecting the driving status of the drivee, the drive control circuit and regenerative control circuit have a control unit for controlling, linearly or in multiple stages, the duty ratio of the drive or regenerative signal to be supplied to the motor based on the phase difference of the phase of the detection signal from the detection unit and the command value signal to the motor.

Abstract: This method maintains a direct voltage at the input of a DC/AC voltage converter in order to maintain an asynchronous motor in a magnetised state, the input of the converter being connected to a DC supply bus of an electric vehicle, and comprises, in a free wheel mode during which the vehicle coasts and the bus is disconnected from a catenary: a) a step (76) for magnetising the motor, then b) a step (78) for operating the motor as a generator of alternating voltage, then c) a step (72) for stopping the converter when the direct voltage of the bus reaches an upper threshold, then d) a step (74) for maintaining the converter in the idle state as long as the direct voltage of the bus remains higher than a minimum direct magnetisation voltage of the asynchronous motor.

Abstract: Provided is a drive regenerative control system of a drivee with a motor superior in torque and weight balance and suitable for miniaturization as the drive source. In a drive regenerative control system having a drive source with an electric motor, a drivee, a control circuit having a drive control circuit of the motor and a regenerative control circuit, and a detection unit for detecting the driving status of the drivee, the drive control circuit and regenerative control circuit have a control unit for controlling, linearly or in multiple stages, the duty ratio of the drive or regenerative signal to be supplied to the motor based on the phase difference of the phase of the detection signal from the detection unit and the command value signal to the motor.

Abstract: A brake-controllable brushless motor has a rotor and a stator having polyphase coils; a polar position detector whereby electric power is supplied to the coil selected by its phase in response to the polar positions of the rotor detected by the polar position detector; a driver division for controlling the electric supply to the coils; a motor pulse identifier for recognizing motor pulse signals fed from the polar position detector; and a delayed pulse generator for producing phase-delayed pulse signals in response to the pulse signals fed from the motor pulse identifier, thereby ensuring that when the brushless motor is braked, the phase delay of the delayed pulse signals is progressively and continuously enlarged, and that the coils receive a controlled electric supply from the driver division in response to the delayed pulse signals.

Abstract: A rotor is provided with slits each of which serves as a flux barrier blocking a magnetic flux. A direction shown by an arrow is a forward direction along which the rotor rotates when a vehicle moves forward. Each of the slits has a width tapering down from a trailing position toward a leading position with respect to the forward direction. The rotation in a reverse direction opposite to the forward direction shown by the arrow causes larger magnetic flux linkage than the rotation in the forward direction, and hence generates high torque and high counterelectromotive force. Therefore, in the reverse direction, the rotor cannot serve as a motor to produce an output unless high voltage is applied thereto. Accordingly, the torque generated in the reverse direction is used for regenerative operation. It is thereby possible to provide a vehicle drive system capable of exhibiting performance in a well-balanced manner between power running and regenerative operation, and a vehicle provided with the same.

Abstract: The present invention relates to a method of recovering energy from the turntable motor (12) in an optical disc drive comprising a power supply and a circuitry (10) that is capable of selectively feeding a current from the power supply into the motor in a first state and from the motor into the power supply in a second state, the method comprising the steps of: decelerating the motor, during decelerating the motor, repeatedly calculating a ratio between a duration of the first state and a duration of the second state in dependence on an angular velocity of the motor, such that a current integrated over the whole decelerating process is fed from the motor into the power supply, and after calculating the ratio, selecting the duration of the first state and the duration of the second state in accordance with the calculated ratio. The present invention further relates to an optical device.

Abstract: A method for protecting against overcharging a battery of a light-weight utility vehicle during regenerative braking includes controlling a regenerative braking process such that a predetermined activation amount of braking torque is produced by a motor of the vehicle when braking torque within a full braking range is initially requested. The predetermined activation amount of braking torque is less than the full braking range. The method additionally includes reading a voltage across a battery of the vehicle induced by a current generated by the motor as the activation amount of braking torque is produced. The method further includes increasing the amount of braking torque produced by the motor, if the voltage across the battery is less than a specified battery voltage threshold.

Abstract: A regenerative braking system includes a capacitor which is electrically connected to a stack and is charged by the stack, a traction motor, a motor control unit which control electric power input to the traction motor and electric power output from the traction motor, a chopper which is connected to the capacitor so as to be ON and OFF switched thereby limiting charging voltage of the capacitor, a braking resistor which consumes regenerative energy so as to serve as an auxiliary brake, and a hybrid control unit which turns on the chopper in case that a charging voltage limit of capacitor is exceeded so as to control overcharge of the capacitor and turns off the chopper in case that charging voltage of the capacitor descends. The capacitor is preferably a super capacitor.

Abstract: When multiple motors (40) share a common DC power supply (10) via a bus (20), a system and method is provided for managing the effect of regenerative energy caused by a motor. The regenerative energy may be sensed, e.g., by a power electronics controller (50, 50?). In response, one or more of the other motors currently in operation may be controlled to operate according to a reduced power factor. Thus, the excess energy is consumed without adding any new components or increasing the amount of work performed in the system.

Abstract: A control device detects whether or not an up-converter fails, based on a DC voltage from a voltage sensor, an output voltage from a voltage sensor, and a duty ratio in controlling switching of NPN transistors. If a failure in the up-converter is detected, the control device then controls an inverter and an AC motor such that regenerative electric power generation in the AC motor is prohibited.

Abstract: A battery-powered tool indicates to an operator that a torque limit has been reached. The tool comprises a driver circuit for generating motor interface driving signals, a motor interface circuit coupled to a motor to selectively couple power to the motor in accordance with the motor driving signals, a torque limit signal generator for generating a torque limit signal, a motor torque signal generator for generating a torque signal corresponding to a torque generated by the motor, and a microcontroller for comparing the motor torque signal to the torque limit signal and for generating a torque limit indicating signal in response to the torque signal being equal to or greater than the torque limit signal so the driver circuit operates the motor to vibrate to alert an operator that the torque limit has been reached.

Abstract: A method and device for electrically braking an electric drive in a machine for processing printing material, includes a power electronics connected between the electric drive and a DC voltage intermediate circuit. A further electric braking device is switchable between the electric drive and the power electronics. Upon a failure of a power system, a computer initiates a generator-type braking operation through the power electronics. The further electric braking device is switched on upon the failure of the power electronics.

Abstract: Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC power. The system can comprise an inverter adapted to receive DC power from the rectifier and provide power to a traction motor and/or auxiliary devices. Certain exemplary embodiments can comprise a system and method for dissipating excess energy from a machine.

Abstract: A system for storing and recovering energy associated with a machine having ground engaging tracks is disclosed. The system includes a power source configured to supply mechanical energy for operation of the machine, and an electric generator operably coupled to the power source. The electric generator is configured to convert at least a portion of the mechanical energy into electric energy. The system further includes an electric motor operably coupled to the electric generator. The electric motor is configured to supply power to the ground engaging tracks. The system includes an energy storage device configured to store energy associated with the machine, and a controller configured to divert a portion of the energy supplied by the power source to the energy storage device while the machine travels in a first direction, and recover energy stored in the energy storage device for use while the machine travels in a second direction.

Abstract: Certain exemplary embodiments comprise a system comprising a plurality of Active Front End units adapted to be electrically coupled to a direct current (DC) bus. Each of the plurality of Active Front End units can be adapted to be electrically coupled to a separate winding of a transformer of a plurality of transformers. Each of the plurality of Active Front End units can be adapted to convert alternating current (AC) voltage to a DC voltage. Each of the plurality of Active Front End units can be adapted to supply the DC voltage to the DC bus. The DC bus can be adapted to be electrically coupled to a plurality of inverters.

Abstract: In the present invention, several polyphase devices are connected together: an inverter, and electrical rotating machine, and a resistive load or braking resistor. The purpose of the resistive load is to dissipate excess electrical power which may be produced when the inverter acts to slow down the rotating machine, causing the rotating machine to act as a generator. In common art, this resistive load is a single DC resistor coupled to the DC link of the inverter via a separate resistor control transistor. In the present invention, the resistive load is a mesh connected array of resistors, and is electrically connected to the same inverter output terminals that the rotating machine is connected to. When it is desired that the resistors absorb energy, for example from a braking operation, then the harmonic content of the inverter output is adjusted, thus placing voltage differences across the resistor array and causing current to flow in the resistors.

Abstract: A motor control apparatus supplying AC power to a motor having a plurality of motor windings having an inverting part including a bridge circuit having a plurality of switching units, and supplying the AC power to the motor; brake relays short circuiting the motor windings by turning on when the motor brakes; brake resistors, respectively, connected to the motor windings and consuming an overcurrent generated from the motor when the brake relays short circuit the motor windings; and a switching controller turning on and turning off the switching units provided in one of opposite ends of the inverting part so that the overcurrent consumed by the brake resistors is changeable in proportion to a rotation speed of the motor, when the brake relays short circuit the motor windings to improve an effect of a dynamic braking operation and to prevent breakdown thereof.

Abstract: A motor drive circuit (3) includes a plurality of pairs of a power-supply-side drive transistor (15, 16) and a ground-side drive transistor (17, 18) that drive a coil (9) from a midpoint thereof, a drive current detecting unit (19) that detects a drive current of coil (9) on the power supply side, and a control circuit (20) that controls such that in the case where the motor rotating in a positive direction is braked, in order to apply a torque in a negative direction, selects the power-supply-side drive transistor and the other ground-side drive transistor and turns on to flow the drive current, and when the drive current becomes a predetermined value, turns off these selected power-supply-side drive transistor and selected ground-side drive transistor to flow a regenerative current. Accordingly, the motor drive circuit that can control the torque in the case where the torque in the negative direction is applied to the motor rotating in the positive direction to brake can be provided.

Abstract: Several embodiments of electric vehicle control and control apparatus wherein the amount of regenerative braking of the vehicle and the type of braking is determined by current conditions to provide simpler and more effective control regardless of condition of the power source for the vehicle.

Abstract: A motor control apparatus can protect circuit elements in an appropriate manner while preventing an incorrect abnormality determination when a motor is in regeneration operation, etc. The apparatus includes a target current calculation section (51), a drive control section (52) that generates a drive signal based on a current deviation ?I between a target current (IMT) and a detected current (IMS), an abnormality determination section (53) that generates an abnormality determination signal based on the target current (IMT) and the detected current (IMS), and a regeneration operation determination section (59) that determines whether the motor (4) is in a regeneration operation state. When it is determined that the motor (4) is in a regeneration operation, a determination threshold of the abnormality determination section (53) is set to a value larger than a determination threshold during power running operation.

Abstract: A vehicle which uses an internal combustion engine and a motor generator as drive sources is provided with a battery disposed under a seat and a fan for cooling the battery. Power is exchanged between the motor generator and battery via an inverter. An electronic control unit estimates the level of background noise which is noise other than the operating sound of the fan in the passenger compartment based on the vehicle speed and rotation speed, etc., of the internal combustion engine. Then, the electronic control unit calculates an operation command value for the fan based on the estimated background noise level and temperature level of the battery and controls the rotation speed of the fan through the operation command value. As a result, it is possible to effectively cool the battery while reducing sensible noise caused by the operating sound of the fan.

Abstract: [Problem] In a conventional rotating electrical machine to perform starting and power generation, an inverter and a rotating electrical machine body are constructed to be separate bodies, and a three-phase harness is provided between the rotating electrical machine and the inverter, and by a voltage drop or loss in this portion, there have been limitations in the improvement of starting and power generation output, and efficiency at the time of same operating current (determined by thermal limitation of the inverter). [Means for Resolution] Since an inverter unit 22 is integrally attached to a rear bracket 44 and is integrally mounted on the end face of a rotating electrical machine 20 in an axial direction, harnesses to be connected can be made short, and reduction in weight of the harness and improvement in resistance to outer disturbance noise can be realized.

Abstract: Certain exemplary embodiments can comprise a system comprising an electric drive system for a machine. The system can comprise a rectifier adapted to convert AC power from an alternator to DC power. The system can comprise an inverter adapted to receive DC power from the rectifier and provide power to a traction motor and/or auxiliary devices. Certain exemplary embodiments can comprise a system and method for dissipating excess energy from a machine.

Abstract: A drive system with an electric motor is described, which includes an integrated armature short-circuit brake and a mechanical brake. If the electric motor cannot be controllably slowed down, a control signal is applied at an activation time to the integrated armature short-circuit brake and the mechanical brake, and the armature short-circuit brake is switched off when reaching a thermal load limit for the electric motor or the control electronics.

Abstract: A control apparatus for an electrically-powered vehicle that includes an electrical motor, a motor control unit, and a traction control unit that controls a drive force so as to suppress spinning of driving wheels based on an operation request, includes: a driver requesting torque calculation unit that calculates a driver requesting torque; a traction requesting torque calculation unit that calculates a traction requesting torque; a torque command calculation unit that calculates a torque command based on the operation request, the driver requesting torque, and the traction requesting torque, during execution of the drive force control by the traction control unit; and a revolution rate sensor, wherein the torque command calculation unit is adapted to set the torque command to a value greater than zero regardless of the operation request when the revolution rate of the electrical motor is less than or equal to a predetermined value.

Abstract: A motor driving apparatus includes a converter unit that converts alternating-current voltage supplied from an external power source into direct-current voltage, and a motor driving unit that receives direct-current power output from the converter unit and drives a motor. The motor driving apparatus stores direct-current power from the converter unit and regenerated power from the motor, and stores these power in a capacitor bank connected in series to a charging and discharging circuit. The capacitor bank connected in series to the charging and discharging circuit is integrated with a charging and discharging circuit optimum for a total capacitance of plural capacitors within the capacitor bank, thereby forming a module. One or more modules are provided corresponding to the capacitance required in the motor driving apparatus. Based on this configuration, the capability of the charging and discharging circuit and the capacitance of the capacitors are not limited by each other.

Abstract: During normal operation of a hard disk drive, control logic controls a plurality of switching elements to provide electrical power to a spindle motor and head motor of the disk drive from a voltage source coupled to first and second voltage supply nodes (e.g., Vcc and ground), the spindle motor has a set of motor windings to which the electric power is applied to rotate the spindle motor, and the control logic is configured to enter a regenerative braking state during normal operation where the switching elements are controlled to isolate the spindle motor from the first voltage supply node and cause regenerative braking of the spindle motor so that kinetic energy due to rotation of the spindle motor is converted to electrical power that is supplied to the head motor by virtue of inductance of one or more motor windings in the set.

Abstract: An electronic braking and energy recycling system associated with a direct current (DC) brushless motor, characterized in that when an electronic braking task is launched, a phase voltage occurred in an inverse mode is applied onto a motor coil corresponding thereto and a gate voltage signal with positive and negative cycles is used to control an upper-side and lower-side branches to switch as compared to each other in the system, so as to redirect a current flown through the motor back to a power source end. In this invention, a controllable inverse torsion is achieved, enabling an electrical machine to be braked smoothly and reliably when necessary. As such, a dynamic power of the motor can be recycled at a maximum rate and thus the purpose of energy recycling is achieved. In addition, no complex circuitry configuration owing to the multi-phase coils is required.

Abstract: A motor control apparatus can protect circuit elements in an appropriate manner while preventing an incorrect abnormality determination when a motor is in regeneration operation, etc. The apparatus includes a target current calculation section (51), a drive control section (52) that generates a drive signal based on a current deviation ?I between a target current (IMT) and a detected current (IMS), an abnormality determination section (53) that generates an abnormality determination signal based on the target current (IMT) and the detected current (IMS), and a regeneration operation determination section (59) that determines whether the motor (4) is in a regeneration operation state. When it is determined that the motor (4) is in a regeneration operation, a determination threshold of the abnormality determination section (53) is set to a value larger than a determination threshold during power running operation.