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 multi-phase brushless direct-current motor and a drive method therefor. The motor comprises a motor body and a driving module, and the driving module comprises a controller, a plurality of H-bridge unipolar inverters each of which for a respective phase, and independent phase coil windings (1) which are successively electrically connected. The method comprises: outputting pulse width-modulated sine waves with identical frequency and amplitude from the controller thereby driving respective ones of the plurality of H-bridge unipolar inverters for each phase; wherein the pulse width-modulated sine waves correspond to every two adjacent phase coil windings having a non-zero phase difference, and phase differences of the plurality of phase coil windings are identical; and outputting sine wave driving voltages or sine wave driving currents in their corresponding phases from the respective ones of the plurality of H-bridge unipolar inverters to the corresponding, electrically connected phase coil windings. The multi-phase brushless direct-current motor and the drive method therefor can realize sine-shaped voltage or current driving, thereby improving the efficiency and reducing noise.

An angle shift compensation system and method for controlling a sinusoidally driven motor to achieve efficient motion and reduced noise. The motor controller uses the angle shift compensation method to monitor the angle shift between a sinusoidal motor control signal configured to drive the motor and a feedback signal received from at least one position detector indicating the position of the motor rotor with respect to the motor stator. In response, the motor controller proportionally adjusts the amplitude of the motor control signal based on the monitored angle shift to maintain the angle shift substantially equal to an angle shift threshold.

An angle shift compensation system and method for controlling a sinusoidally driven motor to achieve efficient motion and reduced noise. The motor controller uses the angle shift compensation method to monitor the angle shift between a sinusoidal motor control signal configured to drive the motor and a feedback signal received from at least one position detector indicating the position of the motor rotor with respect to the motor stator. In response, the motor controller proportionally adjusts the amplitude of the motor control signal based on the monitored angle shift to maintain the angle shift substantially equal to an angle shift threshold.

A pulse generation unit is configured to output pulse signals for driving the stepping motor. A control unit is configured to perform acceleration control or deceleration control of the stepping motor via the pulse generation unit. The control unit is configured to calculate a number of the pulse signals to be output from the pulse generation unit to the stepping motor when accelerating or decelerating the stepping motor at constant acceleration in the acceleration control or the deceleration control based on an initial speed of the stepping motor when the acceleration control or the deceleration control starts, a target rotation speed, and time from start control of the stepping motor to time when the stepping motor reaches the target rotation speed, and change a rotation speed of the stepping motor in the acceleration control or the deceleration control along a sinusoidal waveform.

A motor driver having a high success rate starting mechanism is provided. A multi-segment slope pattern circuit connects a plurality of values of waveforms of a starting waveform signal to form a curve. The multi-segment slope pattern circuit determines a plurality of slopes respectively of a plurality of curve segments included in the curve according to a plurality of parameters related to a motor. The multi-segment slope pattern circuit outputs a multi-segment slope pattern signal according to the plurality of slopes of the plurality of curve segments. A startup signal generating circuit outputs a first startup waveform signal according to the multi-segment slope pattern signal. A motor controller circuit controls a motor driving circuit to start up the motor according to the first startup waveform signal.

A multi-phase brushless direct-current motor and a drive method therefor. The motor comprises a motor body and a driving module, and the driving module comprises a controller, a plurality of H-bridge unipolar inverters each of which for a respective phase, and independent phase coil windings (1) which are successively electrically connected. The method comprises: outputting pulse width-modulated sine waves with identical frequency and amplitude from the controller thereby driving respective ones of the plurality of H-bridge unipolar inverters for each phase; wherein the pulse width-modulated sine waves correspond to every two adjacent phase coil windings having a non-zero phase difference, and phase differences of the plurality of phase coil windings are identical; and outputting sine wave driving voltages or sine wave driving currents in their corresponding phases from the respective ones of the plurality of H-bridge unipolar inverters to the corresponding, electrically connected phase coil windings. The multi-phase brushless direct-current motor and the drive method therefor can realize sine-shaped voltage or current driving, thereby improving the efficiency and reducing noise.

A motor drive device includes a detecting unit that detects a rotational position of a rotor, a drive waveform generating circuit that generates a drive waveform, a control unit that synchronizes a phase of the rotational position of the rotor and a phase of the drive waveform, and a phase difference setting unit that sets a phase difference between the rotational position and the drive waveform during synchronization. An Apos generating unit calculates and outputs a position count proportional to a rotation amount of the rotor. A Bpos generating unit acquires the position count from the Apos generating unit and converts the count into a count value with the upper limit value as the maximum value. A Cpos generating unit multiplies the count value acquired from the Bpos generating unit by the conversion ratio, and calculates a count value with a predetermined upper limit value as the maximum value.

The present invention discloses a modulation method for a three-phase multilevel converter. The modulation method comprises the following steps: generating first three-phase sinusoidal modulated wave signals by a control loop in the three-phase multilevel converter; generating second three-phase modulated wave signals by processing the first three-phase sinusoidal modulated wave signals, wherein in proximity to peak values of a line voltage of the second three-phase modulated wave signals, absolute values of any two phases are unequal; generating PWM pulse signals based on the second three-phase modulated wave signals; and generating driving signals for respective power units in the three-phase multilevel converter based on the PWM pulse signals.

The present application relates to a method, circuit, and motor driving system for adaptively adjusting a PWM duty cycle, comprising: sampling a direct current bus voltage and performing a low-pass filtering; determining whether the direct current bus voltage is under-voltage; if yes, entering an under-voltage protection state; and if not, executing the next step; calculating a new duty cycle and a new amplitude; determining whether the new duty cycle is greater than 100%; if yes, applying a weak magnetic control; and if not, adjusting a duty cycle of PWM signals through the new amplitude. Without altering the core current loop, torque loop, or speed loop of the motor driving system, this application adaptively adjusts the PWM duty cycle based on existing sine wave generators and PWM generators, effectively mitigating the impact of direct current bus voltage fluctuations on motor performance, ensuring straightforward operation, and significantly reducing costs.