A vehicle control apparatus includes a storage and a processor. The storage holds a first resonance map. The processor calculates a first torque command value and switches a control method of a first driving source. The first driving source includes an electric motor. The first torque command value indicates a value of torque to be outputted by the first driving source. The first resonance map includes, as one or more first resonance points, one or more operating points at which resonance occurs in an operating region of the first driving source under a square wave control. The processor switches the control method of the first driving source from the square wave control to a sine wave control on the condition that a predicted route of transition of an operating point of the first driving source meets the one or more first resonance points.

A method for assisting in operating a PWM driven motor comprising for at least one phase of the PWM driven motor: generating a pulse width modulated phase voltage scheme according to a desired phase profile with a base scaling factor, by time multiplexing a first pulse and at least a further pulse within a pulse width modulation period of the phase the first pulse having a pulse width according to a first profile, for that rotor position, multiplied with a first scaling factor, the first profile being in phase with the desired phase profile, and the at least a further pulse having a pulse width corresponds with a further profile, for that rotor position, multiplied with a further scaling factor, the further profile being not in phase with the desired phase profile, whereby the first pulse and the at least one further pulse are positioned within the pulse width modulation period of the phase in at least partially non-overlapping way.

A motor control device for controlling a brushless motor including a rotor and a three-phase armature coil includes: a position detection unit which detects the rotational position of the rotor; a control unit which outputs, in a first control mode or a second control mode, a first drive signal or a second drive signal to an inverter at a current-supply timing based on the rotational position of the rotor; and the inverter which outputs a first current-supply signal or a second current-supply signal to the three-phase armature coil when the first drive signal or the second drive signal is input. For any two of the three phases, a duty value when the duty of the applied voltages is the same is larger in the second control mode than in the first control mode.

A control system for an electric working vehicle includes a first component associated with a first rotor and a second component associated with a second rotor. In use, the first rotor is associated with a first noise waveform and the second rotor is associated with a second noise waveform. Furthermore, in use, the vehicle is associated with a resultant noise waveform comprising the first and second noise waveforms. The control system is configured to control an angular position of the first and/or second rotor such that a parameter associated with the resultant noise waveform is optimised. In this manner, the noise performance of the vehicle can be improved.

A motor system comprises a motor comprising: a stator with a plurality of subwindings each having a plurality of phase connections for receiving phase voltages, wherein each of the subwindings is electrically insulated from each of the other subwindings; a rotor comprising a plurality of permanent magnets or energisable electromagnets; a controller comprising a plurality of control parts, each control part associated with a respective subwinding, each control part being configured to monitor phase voltages of the associated subwinding, between phase connections. The system further comprises a controller configured to: obtain, from each control part, at set discrete time intervals, a plurality of back measured electromotive force, EMF, readings for each of the respective subwindings; using the plurality of measured back EMF readings and an a priori knowledge of the motor's construction to estimate a commutation event timing.

A motor driver having a startup adjusting mechanism is provided. A steady-state detector circuit detects data for driving a motor to stably rotate to output a steady-state detected signal. A startup waveform pattern circuit selects one of a plurality of startup waveform patterns to output a startup waveform pattern signal according to the steady-state detected signal. A startup waveform generator circuit outputs a startup waveform signal according to the startup waveform pattern signal. A motor controlling circuit controls a motor driving circuit to start up the motor according to the startup waveform signal.

Disclosed is about an apparatus, a system, and a method aligning a position of a rotor by applying a specific current to align the rotor a plurality of times to reduce vibration and noise when starting an operation of the motor to align the position of the rotor.

In certain embodiments, a fluidic pump system includes a brushless slotless direct current (BSDC) motor mechanically coupled to a fluidic pump, and a motor controller communicably coupled to the BSDC motor. The BSDC motor is configured to drive the fluidic pump, and the motor controller is configured to generate command signals to drive the BSDC motor. The fluidic pump system further includes commutation circuitry coupled to the BSDC motor that is configured to provide digital sine-wave commutation of the BSDC motor and to provide an indication of movement of the BSDC motor to the motor controller.

A thyristor starter is configured to accelerate a synchronous machine from a stop state to a predetermined rotation speed by sequentially performing a first mode of performing commutation of an inverter by intermittently setting DC output current of a converter to zero and a second mode of performing commutation of the inverter by induced voltage of the synchronous machine. In a first case in which a first synchronous machine having a first inductance is started, a switching rotation speed for switching from the first mode to the second mode is set to a higher rotation speed, compared with a second case in which a second synchronous machine having a second inductance larger than the first inductance is started.

A method for driving an electric motor includes providing two controllers for driving the electric motor. The two controllers use different control methods to drive the electric motor. The method further includes selecting a first controller of the controllers as a primary controller to drive the electric motor and a second controller of the controllers as a secondary controller, monitoring a control of the electric motor, and switching the control of the electric motor from the primary controller to the secondary controller if an error condition is detected in the control of the electric motor.