Abstract: A proportional integrator for control of a motor drive arranged to be connected in parallel with one or more other motor drives to drive a common load. The proportional integrator includes means to receive an input command signal and to compare with a local measured signal from the motor drive and to output a local control signal for that motor drive. Also includes are a global input signal indicative of the behaviour of the one or more other motor drives, the global input signal being incorporated into the proportional integral function with the input command signal and the local measured signal to provide the local control signal.

Abstract: Techniques are described for implementing automated control systems that repeatedly perform automated modifications to control system actuator components' ongoing operations to improve functionality for target battery systems, such as to reduce power dissipation while performing other battery power use activities to maximize battery life. Controlling a battery's usage may include using a DC-to-DC amplifier, and the repeated automated modifications may include modifying the state of the DC-to-DC amplifier actuator to adjust a level of resistance and/or an amount of time during which power is supplied. The repeated automated modifications may be performed to repeatedly reduce the distance between the current battery performance and an idealized version of the battery performance (e.g., a version with no power dissipation).

Abstract: A vehicle window opening device includes a controller, a change detector, and a drawing detector. The controller configured to control opening and closing of a vehicle window based on a drive force of a motor. The change detector is configured to detect a change in a state of movement of the vehicle window. A drawing detector is configured to detect drawing of a foreign matter by the vehicle window based on a change detected by the change detector. The controller is configured to restrict opening of the vehicle window after the drawing detection.

Abstract: A motor driving apparatus is applied to a fan and motor mechanism and a voltage supply unit. The motor driving apparatus includes a motor driving unit, a voltage division resistor, a first resistor, a first switch unit, a second resistor, a second switch unit, a third resistor, a third switch unit, a transistor switch, and a pulse width modulation unit. The first switch unit, the second switch unit, and the third switch unit are configured to select the rotational speed upper limitation of the fan and motor mechanism for suppressing noise.

Abstract: Disclosed is a multi-speed control apparatus for a fan motor. The apparatus includes a driving member, a motor speed sensing member, a resistor circuit, a voltage-division resistor, and a multi-segment switch. The driving member has a controlled end connected with the multi-segment switch. The driving member has an output end connected with the fan motor. The driving member has a detection end connected with the motor speed sensing member. The resistor circuit includes some resistors with various resistances. The multi-segment switch interconnects the resistor circuit, the voltage-division resistor, the controlled end of the driving member, and a voltage source. This switch is optionally connected to the resistor disposed in the voltage source or voltage-division resistor. An input voltage is created across the resistor by dividing the voltage. The driving member is therefore provided for driving the fan motor to a rotating speed according to the input voltage.

Abstract: A power tool comprises a housing, a direct current motor arranged in the housing, a speed reduction mechanism coupled to a shaft of the motor, a tool head driven by the speed reduction mechanism, a first direct current power source, and a switching device. The motor comprises a common brush, a high speed brush and a low speed brush which are in sliding contact with a commutator. The switching device is configured to selectively connect the common brush and the high speed brush with the power source to operate the motor in a high speed mode and to connect the common brush and the low speed brush with the power source to operate the motor in a low speed mode.

Abstract: A power converter circuit for providing maximum utilization of a DC bus voltage to a two-phase Permanent Magnet Synchronous Motor (PMSM) is disclosed. The circuit includes first, second, and third nodes, each node being the junction between series connected high and low side switches connected across a DC bus; a PMSM having first and second windings and a star point at which the first and second windings are coupled to each other, the first winding having a terminal connected to the first node, the second winding having a terminal connected to the second node, and the star point being connected to the third node; and a controller for performing a three-point Pulse Width Modulation (PWM) coupled to a gate of each switch.

Abstract: The invention teaches a speed control system for a brushless DC motor for a ceiling fan, comprising a power circuit 1, a microprocessor circuit 2, a power drive circuit 3, a speed regulation circuit, and a brushless DC permanent magnetic motor 5, wherein the input terminal of the power circuit 1 is connected to the output terminal 101 of an AC power source, the output terminal of the power circuit 1 serves to power the various circuits, the output terminal of the microprocessor circuit 2 is connected to the input terminal of the power drive circuit 3, the output terminal of the power drive circuit 3 is connected to the coil windings 501 of the brushless DC permanent magnetic motor, and the output terminal of the speed regulation circuit is connected to the input terminal of the microprocessor circuit 2. The speed control system of the invention provides the advantages of low energy consumption, low noise during the operation of the motor, and a stable operation at low speeds.

Abstract: In a method for the detection of the rotational position of the rotor of a DC motor with commutator by evaluating the time development of a rotor current signal of the DC motor, said signal comprising a periodic waviness around an average value and comprising current ripples generated by commutation which are superimposed to said waviness, the rotor current signal of a current ripple detector unit (30) is supplied for detecting the current ripples of the rotor current signal. The rotor current signal is further supplied to a waviness detector unit (34) for detecting a half or full wave of the rotor current signal. The current ripple detector unit (30) is arranged to output a current ripple pulse for each detected current ripple. The waviness detector unit (34) is arranged to output a waviness pulse for each period of the waviness. The output signals of both detector units (30,34) are supplied to a logic OR unit (38) for generating a logic signal.

Abstract: The present invention provides a fan that has a fan motor and two signal lines including a number-of-rotations switching control signal line and a rotational state outputting signal line, makes the fan motor rotate at a number of rotations determined by a number-of-rotations switching control signal input via the number-of-rotations switching control signal line, outputs the rotational state of the fan motor via the rotational state outputting signal line, and can provide notification of detail data without increasing the number of signal lines. The fan retains data in the data storage section in a non-volatile manner and outputs the data via the conventionally existing rotational state outputting signal line.

Abstract: Disclosed is a starting device and method for eliminating a peak current introduced when an inductive circuit such as a motor or a direct-current (DC) motor is actuated, The starting device includes a signal generator electrically connected to the inductive circuit and generating a first signal corresponding to a signal output by the inductive circuit, a comparative circuit electrically connected to the signal generator for converting the first signal to a second signal to be compared with a reference signal to generate a control signal, and a controlling device electrically connected with the inductive circuit and the comparative circuit for receiving the control signal and gradually increasing a current input into the inductive circuit corresponding to the control signal, thereby eliminating the peak current introduced when the inductive circuit is actuated.

Abstract: An apparatus, system, and method are disclosed for controlling fan speed. A power sensing module senses input voltage and current of a power supply. The power supply includes one or more stages and regulates at least one output bus. A power calculation module calculates input power from the input voltage and the input current. A temperature sensing module senses an ambient temperature and/or a temperature at a component cooled by a fan. A fan speed calculation module calculates a fan speed signal for the fan. The fan speed signal is a function of the input power calculated by the power calculation module and the sensed temperature sensed by the temperature sensing module for at least a portion of a fan speed range. A fan speed transmission module transmits the fan speed signal to the fan and adjusts a fan speed based on the fan speed signal.

Abstract: Provided are an apparatus and method for controlling a motor which compensates for a mechanical tolerance of the motor in a case where a feedback sampling frequency increases in order to more precisely control a brushless DC motor. The apparatus for compensating the mechanical tolerance of the brushless DC motor includes: a speed controller calculating a speed error that is a difference between a motor speed measured in control sections and a reference speed using a back electromotive force generated by the motor, and generating a motor control input signal using the speed error of the control section; a moving average calculator calculating a moving average value of the motor control input signals in a predetermined moving average section including recently generated motor control input signal whenever the motor control input signals are generated; and a motor driver generating an electric current for driving the motor corresponding to the moving average value.

Abstract: Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In some implementations, first and second signals indicative of BEMF of different stator windings may be used to determine a speed-related characteristic. The speed related characteristic may be used to determine an error amount, which may be used to determine a correction factor to control the speed of the spindle motor.

Abstract: A low speed region position estimating portion is designed to be suitable for when the motor is operating in a low speed region, and estimates a low speed estimated rotational position ??L. A high speed region position estimating portion is designed to be suitable for when the motor is operating in a high speed region, and estimates a high speed estimated rotational position ??H. A dividing portion obtains a divided estimated rotational position ??M by internally dividing the low speed estimated rotational position ??L and the high speed estimated rotational position ??H. A rotation speed calculating portion obtains a rotation speed ? of a rotor based on an output signal from a steering sensor. The rotational position of the rotor is then obtained by selecting one of i) the low speed estimated rotational position ??L, the high speed estimated rotational position ??H, or the divided estimated rotational position ??M, based on that rotation speed ?.

Abstract: A motor control circuit includes: a detector outputting a detection signal in accordance with the motor rpm; a counter counting the number of clocks in accordance with a rotational cycle represented by the detection signal; a controller counting a DC motor based on the count value; and a divider dividing a frequency of a basic clock based on a preset division value to generate a counting clock. The divider generates a counting clock having a frequency corresponding to a rotational cycle, and the counter counts the number of counting clocks.

Abstract: General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as motor in both direction of possible rotation, and in the second and fourth quadrant like regenerative brake DC generator, recovering the energy towards the DC network supply. To obtain that generalized control for DC machines of any type, the invention subject of this patent, is based on the interaction of two original ideas that they are: (1) Maintaining the direction, of the current in one and only one of the two main windings of the DC machine (7) either field or armature, by means of a rectifier bridge (6). (2) Use a DC controlled power supply (14), with reversible polarity to feed the complete machine.

Abstract: Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In some implementations, first and second signals indicative of BEMF of different stator windings may be used to determine a speed-related characteristic. The speed related characteristic may be used to determine an error amount, which may be used to determine a correction factor to control the speed of the spindle motor.

Abstract: A system for controlling a motor for use in a ventilation system may include a motor, a voltage adjustment system, a user interface, and a motor controller. The voltage adjustment system may be configured to adjust a voltage applied to the motor. The user interface may be configured to receive patient settings input from a user and communicate target ventilation parameters to the motor controller. The motor controller may include a calculation engine configured to calculate motor performance parameters for achieving the target ventilation parameters, and based at least on the calculated motor performance parameters, perform a voltage adjustment analysis for controlling the voltage adjustment system. The motor controller may further include a voltage adjuster controller configured to activate the voltage adjustment system based on a first result of the voltage adjustment analysis and to not activate the voltage adjustment system based on a second result of the voltage adjustment analysis.

Abstract: In one embodiment, a multi-channel power supply controller adjusts the value of an error signal to minimize overshoot and undershoot during load transients.

Abstract: Each connection point of three series circuits formed by connecting two MOSFETs in series between positive and negative terminals of a direct-current power source is connected to a driving coil of a motor. The MOSFET is composed of an FET main body, and a parasitic element group, and its current tolerance is a sum of maximum value of a first current flowing in the FET main body when the MOSFET is turned on, and maximum value of a second current flowing in the parasitic element group upon transition of the MOSFET from on to off state.

Abstract: A method is specified for controlling a polyphase brushless electric motor, wherein the motor phase currents which are associated with the phases are produced by clocked variation of the respectively applied electrical potential. In this case, the motor phase currents flow back from the electric motor via a common return line with the peak current value in the return line being detected and being included in a controlled variable. Furthermore, a circuit configuration is specified, which is provided in a corresponding manner in order to carry out the control method. The control method and the circuit configuration allow the motor phase currents to be taken into account in the control of the electric motor in a simple and cost-effective manner.

Abstract: The invention is directed to a system and method for regulating a load (such as a CPU). A pulse-width-modulation (PWM) regulator calculates the duty cycle of the control pulse from a PWM controller, and then compares the duty cycle to a predetermined threshold. Thereafter, the PWM regulator regulates working conditions, such as clock frequency, supplied voltage, or fan spin speed, based on the above comparison.

Abstract: A low speed driving control device of a DC motor and a control method thereof are provided. The low speed driving control device of a DC motor includes a first speed controller which controls the speed of the DC motor according to a control period, based on a feedback information about current speed of the DC motor, a second speed controller which controls the speed of the DC motor according to a voltage table, and a switching controller which switches between the first and the second speed controllers according to a position change of an encoder which is connected with the DC motor. Accordingly, by using a low resolution encoder, a high quality driving can be provided at a low price.

Abstract: General purpose 100% solid state Direct Current drive for rotary DC machines with four quadrants operation. It is to say that allows the rotary DC machine to act like motor or generator in the two direction of possible rotation. In the first and third quadrant as motor in both direction of possible rotation, and in the second and fourth quadrant like regenerative brake DC generator, recovering the energy towards the DC network supply. To obtain that generalized control for DC machines of any type, the invention subject of this patent, is based on the interaction of two original ideas that they are: (1) Maintaining the direction of the current in one and only one of the two main windings of the DC machine (7) either field or armature, by means of a rectifier bridge (6). (2) Use a DC controlled power supply (14), with reversible polarity to feed the complete machine.

Abstract: An electric motor drives a belt spool of a seatbelt retractor in a vehicle using a micro-controller and a drive circuit that drives the electric motor. A plurality of PWM control signal sources are provided each of which has a trigger input and a control signal output. Each control signal source, upon application of a trigger pulse to its trigger input, provides on its control signal output a control pulse of a duration different from durations of control pulses of all other control signal sources. A set of motor control programs are permanently stored in the micro-controller. A program selection signal is sent to the micro-controller from a central sensor unit in the vehicle. Trigger pulses are sent by the micro-controller to the trigger inputs of the control signal sources. Particular ones of the control signal sources are selected for application of their signal outputs to the drive circuit in a control sequence defined by a selected control program.

Abstract: Provided are an apparatus and method of controlling a motor by compensating for recurring false speed errors generated in a direct current (DC) motor. The apparatus includes a learning control unit adapted to calculate recurring false speed errors related to a mechanical tolerance associated with the motor in each one of a plurality of controlling sections associated with a single rotation of the motor, and generate a corresponding reference speed for each controlling section, and a motor control unit adapted to control the rotational speed of the motor in relation to a speed error defined by a difference between the reference speed for each controlling section and an actual measured speed of the motor for each controlling section.

Abstract: A universal low-power ceiling fan controller includes a brushless DC motor in a ceiling fan casing, a microprocessor connected to a power supply that operates with a remote-control device and has a transmitter and a receiver for transmitting data signals to the microprocessor by wireless transmissions, a driving device installed between the microcontroller and the motor for turning on or off a fan, and a feedback device having at least three Hall components for continuously sending feeding back a position change to the microcontroller for determining the motor speed, such that the microcontroller receives the signals of the remote-control device and the driving device drives the motor to rotate, and sample signals of the feedback device is fed back to the microcontroller to determine and conduct an automatic compensation, so as to maintain a constant speed of the vanes of the ceiling fan and lower the electric power consumption.

Abstract: The invention relates to a circuit and a method for the speed control of a d.c. motor, particularly the speed control of a fan driven by this d.c. motor, which is used as part of an air distribution system in passenger and commercial motor vehicles. The circuit for the speed control of a d.c. motor includes, according to the invention, a d.c. motor and a supply voltage supplying this d.c. motor, a control module for the generation of PWM-signals and registration of measurement currents and measurement voltages, a number n of parallel-connected field effect transistors which are designed suppliable with PWM-signals in a cascade manner to switch the d.c. motor, and a number n?1 resistors which are designed each to be connected with one of the n field effect transistors which are designed each to be connected with one of the n field effect transistors, whereby n is at least 2.

Abstract: A motor driving apparatus includes a power circuit that controls an output voltage via a feedback resistance. The power circuit varies the output voltage by changing a value of the feedback resistance at a time of at least one of activation and termination of a motor, thereby enabling to activate the motor at any one of a high speed and a low speed.

Abstract: A device for correcting a digital estimate of an electric signal is described. The device includes a comparator that generates a current proportional to the difference between an analog estimate signal, which derives from the digital estimate, and the electric signal. The device also includes a capacitor positioned to be charged by the current, a transistor that discharges the capacitor, and a comparator that compares the voltage at the terminal of the capacitor with a reference voltage. The device also includes a controller that drives the transistor in response to the output signal of the comparator and a logic device that generates a correction digital signal to be added to or subtracted from the digital estimate of the electric signal in correspondence of an ascending or descending waveform of the electric signal.

Abstract: Disclosed is a multiphase brushless DC motor of a concentrated winding type having shunt connection, and a control circuit. The brushless DC motor includes a rotor made up of a permanent magnet with M number of poles, and a stator operating in K number of phases by means of windings wound on N number of teeth, wherein the plurality of windings having the same excitation phases wound on the teeth, are each maintained in shunt connection so as to improve driving torque and a rotational speed. A brushless DC motor includes a switching section having a plurality of upper switching devices and a plurality of lower switching devices connected with each other in series. Each of the windings is connected between a common joint between the upper and lower switching devices, and a common joint between a lower power supply voltage and a plurality of upper power supply voltages.

Abstract: The invention relates to a method for regulating an electrical machine (1) with an excitation winding (2) and a stator winding (3). The stator winding (3) is connected at its output terminals (10) to a converter bridge (5). The electrical machine (1) can be operated in the regulation ranges of field-oriented regulation (11), field-weakening operation (12), and diode operation (13). The transition from one of the regulation ranges (11, 12, 13) to a respective adjacent regulation range (11, 12, 13) is achieved through an overmodulation of the pulse-to-width modulation (26) and a limitation of the outputs from current regulators (34, 35) of the stator winding (3) of the electrical machine (1).

Abstract: A motor control system 10 includes an engine cooling module 14 including a DC motor 12. The system includes a switch 18 constructed and arranged to be controlled by a pulse width modulated (PWM) signal 26. The switch 18 is operatively associated with the DC motor to control current to the DC motor and thus control the speed of the DC motor. A controller 20 is operatively associated with the switch. The controller is constructed and arranged to select periods, of a limited-pool of frequencies each being less than 500 Hz, from a pseudo-random sequence of periods and to send the selected periods to the switch, thereby controlling noise and vibration of the module.

Abstract: A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative processing loop being performed n times. The iterative processing loop includes regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current; operating in a closed loop mode to determine a first field firing angle and a second field firing angle; operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle; and determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.

Abstract: Methods and apparatus for controlling performance of electric motors in a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field coils which are independently excited by a source of voltage to generate armature and field currents, the armatures being connected in series to the voltage source include detecting a condition in the system indicating that one of the wheels is slipping, reducing power delivered to one of the motors that is associated with the slipping wheel in response to the detection of the condition, providing power to the one or more motors that are not associated with the slipping wheel after the power delivered to the motor associated with the slipping wheel is reduced, and restoring the power delivered to the one of the motors associated with the slipping wheel in response to a recovery event.

Abstract: In separately excited DC brush motors ML and MR, an armature current control circuit for feeding power to armatures 61 and a field current control circuit for feeding power to a field system 62 form separate systems and are independently controllable except that both the control circuits share a battery B2 between them. When the overrotation of the motors ML and MR is detected from the backflow of an armature current and a rise in the voltage of the battery B2 or when the reverse rotation of the motors ML and MR is detected from an increase in the armature current and a decrease in PWM for the armature current, the generation of counter electromotive force is restrained by reducing the field current of the motors ML and MR so as to prevent the armature current control circuit from being damaged.

Abstract: The invention relates to an electric drive device with a DC motor (2) comprising a control circuit with an electronic commutator (3). The invention is characterized in that a derivation of a control signal (V_i_ref) is obtained from an induced motor voltage (E_sample) detected by a measuring device and from a reference value (V_i_av) which serves to regulate the speed of the DC motor (2), and in that the derived control signal (V_i_ref) serves to achieve a substantially constant torque of the DC motor (2) through adjustment of the motor currents (ia, ib, ic).

Abstract: The DC electrical motor system includes a motor having an armature DC transducer coupled to an armature current controller by a sensor/detector arrangement to control the armature current. A field DC transducer coupled to a field current controller by another sensor/detector arrangement facilitates the control of the field current. An armature-field comparator is coupled to the field current controller to help control the field current when the motor armature windings are short-circuited through windings in the armature field comparator.

Abstract: A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse modulated chopper circuit which varies the width of the pulse in response to the throttle of the golf car. Full control of the input to the field winding is gained by the supply of power to an H bridge circuit. Armature current is continuously sensed to provide an indication of the status and performance of the car during operation. At a predetermined level of armature current the field current is adjusted to provide a higher torque at a specific speed. When armature current indicates a predetermined overspeed condition, field current is adjusted to enhance regeneration and the resultant braking. In addition, the stopped condition is continuously monitored.

Abstract: The present invention utilizes batteries in series addition and through controlled switching maintains current and voltage more constant as the batteries power a consuming device. The invention is described in its application to an electric motor powered wheeled vehicle and includes sensing means at the vehicles accelerator pedal and computer control to automatically control the power from a battery storage system to the electric motor efficiently and extend longevity of a battery powered vehicle.

Abstract: A system is provided for controlling a D-C motor which is constructed to propel a golf car. The motor is controlled to provide performance according to a predetermined field current map which calls for a particular performance response to specified performance events. The performance events are detected by sensing actual speed and armature current and the performance response is triggered by adjustment of the field current. A performance map correlating actual speed to various events and specifying the field current response is designed for the motor used. In addition an armature current performance map is similarly constructed correlating armature current to particular performance events.

Abstract: A motor control apparatus for detecting motor overspeed in an electric car to prevent destruction of the motor and assure the safety of the vehicle. Torque control is applied when the motor speed is less than a specified rotational velocity. When the motor is detected to be operating at greater than the specified rotational velocity, i.e., when motor overspeed is detected, the motor is controlled to coast or regenerate to lower the motor speed to less than the specified rotational velocity, after which normal control is resumed, thereby preventing collision due to sudden braking and preventing damage to the motor.

Abstract: A system is provided for controlling a DC motor which is constructed to propel a golf car. The motor is a shunt wound motor having independently excited armature and field windings. The basic input to the armature of the motor is supplied through a pulse modulated chopper circuit which varies the width of the pulse in response to the throttle of the golf car. Full control of the input to the field winding is gained by the supply of power to an H bridge circuit. Armature current is continuously sensed to provide an indication of the status and performance of the car during operation. At a predetermined level of armature current the field current is adjusted to provide a higher torque at a specific speed. When armature current indicates a predetermined overspeed condition, field current is adjusted to enhance regeneration and the resultant braking. In addition, the stopped condition is continuously monitored.

Abstract: An electric motor (10) particularly a low-voltage collectorless dc motor, has a microprocessor (18, 40) with a reset input (24). Further, it has a device (26) which, during the running of the motor, generates signals (R) which depend upon the rotational position of the rotor (14) of the motor (30). These signals are applied to the reset input (24) and have the effect that the microprocessor is reset to predefined starting states or conditions, at times controlled by the turning of the rotor (14).

Abstract: A control circuit for controlling the excitation current in a compound motor includes a limiting switch connected in series with the shunt field winding of the compound motor. The limiting switch is closed whenever either the speed of the motor is excessive, the armature current is excessive, or there is insufficient back EMF due to a light load.

Abstract: A direct current (DC) electrical motor system includes a DC electrical motor having energy conversion armature windings conducting a first electric current, and an electromagnetic field windings conducting a second electric current. The system also includes means to maintain the magnitude of the second electric current in the electromagnetic field windings at a substantially constant ratio of the magnitude of the first electric current in the energy conversion armature windings. Thus, the magnitude of the ampere-turn strength of the electromagnetic field of the motor is substantially always a ratio of the magnitude of the electric current in the energy conversion armature winding circuit of the motor, and the DC electrical motor of this invention performs substantially the same as a conventional series wound DC electrical motor.

Abstract: A multiple output stepped compound voltage supply includes a field intensity control which enables a DC motor control circuit to provide continuous linear or pulse modulation control among the stepped voltages in relation to the voltage output.

Abstract: A predictor (20) and a learning device (20) are newly provided to a conventional speed controlling system for a rotating body, according to the present invention. The predictor predicts an instantaneous speed error on the basis of a plurality of speed errors to enable elimination of a phase delay due to sampling. The learning device is effective to remove torque ripple components of a motor on the basis of the speed errors. As a result, it is possible to expand a speed controlling region of the motor and to decrease irregularlity in rotation of the motor to a great extent. The predictor solely makes it possible to obtain a present accurate rate of change of data previously sampled from a plurality of sampled data, whereby a phase delay due to digital processes may be prevented.

Abstract: The present invention features a system for optimizing control of separately excited shunt-wound dc motors, where optimization is achieved through microprocessor-based independent PWM control of a chopper (armature) and an H-bridge (field). Connected to the armature is an armature voltage amplifier for varying the applied armature voltage. A field voltage amplifier is also provided for determining the direction of motor rotation and varying the voltage applied to the field winding. A first sensor is connected to the driven wheel(s) of the vehicle in order to determine the wheel rotational speed. A second sensor is connected to the armature circuit in order to determine the armature current. A third sensor is connected to the field circuit in order to determine the field current. A decoupling controller uses the wheel speed and armature current information, and adjusts the armature voltage and the field voltage.