The present invention provides a driving voltage generation method of a linear motor, and linear motor driving voltage generation device performing same. The driving voltage voltage generation method of a linear motor includes the following. Define the displacement waveform of the linear motor’s vibrator within a preset period and the displacement waveform is an asymmetrical waveform. Calculate the voltage waveform corresponding to the linear motor in the preset period according to the displacement waveform. The present invention is designed to use the driving voltage generated by the driving voltage generation method to effectively control the linear motor to express the vibration effect in a specific direction.

AC motor rotates independent from power frequency gives advantages in size and controllability. Oscillating and rotating magnetic field is created across airgap by using Amplitude Modulated input. Higher frequency (Carrier) is the power input and the lower frequency (Signal) determines speed of the motor. Stator and Rotor work as primary and secondary of transformer, rotor windings are arranged to keep resultant EMF generated within the winding as zero when rotor aligned with stator magnetic field and increase when deviates. The current generated on deviated rotor winding creates a push back torque keeping the rotor aligned with magnetic field. This interlocks magnetic field and the rotor. Two different frequencies are applied at either end of the stator windings so that the current flow through each winding become amplitude modulated, average of the two frequencies become carrier frequency and control frequency is half of the difference between two frequencies.

A motor driver for driving a single coil motor, the motor driver includes: a bridge driver configured for applying a driving signal to the single coil by commuting a motor voltage (Vmot) or a motor current (Imot), supplied to the bridge driver, between terminals (OUT1, OUT2) of the single coil; a controller configured for controlling the commuting of the bridge driver and for setting a preferred value of the motor voltage in function of a preferred operating point; a first voltage regulator configured for regulating the motor voltage or the motor current to the preferred value.

A motor drive signal generator configured to combine at least a part of a first input waveform with at least a part of a second input waveform to create a compound waveform, wherein the first waveform is a sine wave and the second input waveform is a square wave.

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 commutation waveform generating circuit is provided. The motor commutation waveform generating circuit includes: an edge detection circuit, configured to receive sensing signals of the motor and derive a clock signal indicating a commutation switching point of the motor; an angle cutting circuit, controlled by the clock signal to generate an angle indication pulse indicating a rotation angle of the motor; a synthetic wave generating circuit, using the angle indication pulse to sequentially change waveform voltages corresponding to required angles and output them in segments; and a signal combining circuit, controlled by the clock signal to combine waveform voltage signals generated by the synthetic wave generating circuit, thereby obtaining a plurality of synthetic waveforms provided to a drive control system of the motor for drive control after pulse width modulation.

Circuitry for efficiently operating a three-phase AC motor having three coils, each of which implementing a corresponding phase, comprising four half-bridge inverters having a common bus voltage, for controlling the level and the phase of input voltages supplied to the coils and a control circuitry for operating the four half bridges. A first coil of the motor is being connected between a first half-bridge inverter and a second half-bridge inverter and generating by the control circuitry a desired voltage across the first coil using the first and second half-bridge inverters; A second coil of the motor is being connected between the second half-bridge inverter and a third half-bridge inverter and generating by the control circuitry a desired voltage across the second coil using the second and third half-bridge inverters; A third coil of the motor is being connected between the third half-bridge inverter and a fourth half-bridge inverter and generating by the control circuitry desired voltage across the third coil using the third and fourth half-bridge inverters. The control circuitry, controls the phase of the voltage generated by the fourth half-bridge inverter to be equal to the phase of the voltage generated by the first half-bridge inverter.

The present invention provides a linear motor driving voltage generation method and related devices. It is designed to use the driving voltage generated by the driving voltage generation method to effectively control the linear motor to express the vibration effect in a specific direction. The method of the present invention includes: Define the displacement waveform of the linear motor’s vibrator within a preset period. The displacement waveform is an asymmetrical waveform. Calculate the voltage waveform corresponding to the linear motor in the preset period according to the displacement waveform.

The present invention enables the user to perceive the vibration of the linear motor in a specific direction.

A motor commutation waveform generating circuit is provided. The motor commutation waveform generating circuit includes: an edge detection circuit, configured to receive sensing signals of the motor and derive a clock signal indicating a commutation switching point of the motor; an angle cutting circuit, controlled by the clock signal to generate an angle indication pulse indicating a rotation angle of the motor; a synthetic wave generating circuit, using the angle indication pulse to sequentially change waveform voltages corresponding to required angles and output them in segments; and a signal combining circuit, controlled by the clock signal to combine waveform voltage signals generated by the synthetic wave generating circuit, thereby obtaining a plurality of synthetic waveforms provided to a drive control system of the motor for drive control after pulse width modulation.

A current control method and a motor control circuit are provided. The motor control circuit includes a first rectification circuit and a second rectification circuit connected in parallel between a live wire and a natural wire of a power supply, a sampling resistor, and a controller connected to the second rectification circuit. The first rectification circuit is connected to the motor. The current control method include obtaining a periodic waveform signal of a bus voltage; collecting a bus current value through the sampling resistor; sampling the periodic waveform signal for a plurality of times; linearly fitting multiple voltage values obtained at a plurality of sampling time points to obtain multiple slopes; obtaining a power frequency according to the multiple slopes; calculating a compensation current value according to the power frequency; and generating a control signal according to the compensation current value and the bus current value.