495results about "Starter arrangements" patented technology

The invention provides a double-squirrel-cage permanent magnet motor with a fractional slot concentrated winding and a pole-changing switching method, the motor comprises a stator and a rotor, the stator comprises a stator winding design and a winding pole-changing switching method, and two groups of conducting bars are arranged on the outer circumferential side of the rotor. The two groups of conducting bars are respectively connected with the two end rings to form two independent double-squirrel-cage structures, and each conducting bar corresponds to a permanent magnet steel magnetic pole distributed in the circumferential direction of the rotor. Two groups of conducting bars are arranged on the outer side of the rotor, and the two groups of conducting bars are respectively connected with the two end rings to form two independent double-squirrel-cage structures. The independent double-squirrel-cage structure not only can filter specific-order magnetomotive force harmonics generated by a stator winding, but also greatly reduces the magnetic leakage phenomenon due to the position relation between the conducting bars and the magnetic poles of the permanent magnets, so that the blocking effect of the conducting bars on a permanent magnetic circuit is reduced to the minimum, the utilization rate of the permanent magnets is improved, and the cost is reduced.

A start up method for an electric motor configured to drive a mechanical load in a reciprocating or oscillating cycle, the method being for use in a power tool and comprising: setting a first target speed ramp for the motor having a first gradient; monitoring a drive parameter indicative of the power and / or torque generated by the motor; detecting a maximum in the drive parameter; and in response to detecting the maximum, setting a second target speed ramp for the motor having a second gradient that is greater than the first gradient.

The invention relates to the technical field of motor current regulation, in particular to a synchronous reluctance motor induction load change automatic regulation output energy-saving current system, which comprises a load control unit for selecting a starting mode according to a load condition by monitoring load data of a motor in real time and predicting a change trend of a load; the compensation isolation unit performs sampling and real-time compensation according to the change trend to obtain accurate data; the dynamic protection unit is connected with the compensation isolation unit, and key components are modularly designed, so that the starting stability of the motor is improved, the high efficiency in the running process of the motor is ensured, the impact on a power grid and the motor during starting can be remarkably reduced through a soft starting mode, the service life of the motor is prolonged, and the running stability of the motor is improved. The sampling precision is improved, it is ensured that current adjustment and load control are more accurate, the reliability of the system is greatly improved through an over-current and over-temperature protection mechanism, and equipment damage or shutdown caused by faults is avoided.

The invention relates to the field of permanent magnet synchronous motor control, in particular to an RANF adaptive harmonic suppression method based on dustpan line optimization, which comprises the following steps: S1, establishing a d-q axis control model for a permanent magnet synchronous motor, listing voltage, current and electromagnetic torque equations, giving a harmonic current equation, and adopting an ANF adaptive notch extraction algorithm to obtain a harmonic current control model for the permanent magnet synchronous motor; obtaining estimated values of specific-order harmonic amplitude and phase, and generating harmonic compensation quantity from the estimated values by adopting a PI regulator so as to realize a steady-state indifference-free harmonic suppression effect; and S2, in order to solve the problem that the ANF adaptive harmonic suppression algorithm is difficult to follow the d-q axis current rapidly changing along with the direct current amount, an RANF adaptive harmonic suppression algorithm adopting an R regulator is proposed, the ANF following performance is greatly accelerated, and the practicability of the ANF is improved. When the motor load or the rotating speed changes, quick response can be achieved, system instability is avoided, the dynamic stability of the system is remarkably improved, and the application scene of ANF adaptive harmonic suppression in the permanent magnet synchronous motor is widened.

The invention discloses a brushless motor starting method and device, and the method comprises the steps: controlling a power controller to drive a rotor of a brushless motor to rotate to a starting position in response to a received starting signal; controlling a power supply controller to drive a rotor of the brushless motor to rotate through an open-loop control strategy, and detecting a back electromotive force signal on a stator of the brushless motor through a back electromotive force sensor; and determining an estimated rotating speed and an estimated position of the brushless motor according to the back electromotive force signal through a closed-loop control strategy, and controlling a power supply controller to drive the rotating speed of a rotor of the brushless motor to reach a preset target rotating speed according to the estimated rotating speed and the estimated position. The precision of rotating speed control of the brushless motor under the low-rotating-speed working condition is guaranteed, the dependence on a high-precision position sensor is reduced, the system cost is reduced, the dynamic response performance is improved, the special requirement of the starting stage can be met, and efficient dynamic adjustment can be achieved in the operation stage.

The invention discloses a permanent magnet motor starting control method and system based on harmonic injection, and aims to improve the harmonic injection precision and the dynamic adaptive capacity in the motor starting process. According to the method, frequency domain features are extracted by adopting CNN of a multi-scale convolution kernel, dynamic changes of a time sequence are captured in combination with Bi-LSTM, and an attention mechanism is introduced to dynamically weight key transient signals, so that comprehensive modeling and optimization of harmonic signals on frequency domain, time domain and transient features are realized; and an efficient closed-loop dynamic optimization system is constructed by further combining the global search capability and the real-time error feedback mechanism of the genetic algorithm. The method can adaptively capture the key change when the working condition suddenly changes, correct the harmonic injection parameters in real time, significantly reduce the power loss caused by torque fluctuation and high-frequency harmonic in millisecond response, and improve the stability of harmonic injection and the energy efficiency optimization effect.

A power tool includes an electric motor; a power supply management device; a driving device driving the electric motor to operate to implement a main function; and an operating device being operated to activate one or more functions and output a function signal. The power tool has the main function and an auxiliary function, and the function signal includes a main function signal and an auxiliary function signal. The power supply management device is configured to output a first enable signal when receiving any function signal and output a third enable signal to the driving device when receiving the main function signal. The power tool further includes a first controller configured to output a first drive signal to the driving device when receiving the first enable signal. The driving device drives the electric motor to operate when receiving the third enable signal and the first drive signal.

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

The invention provides a permanent magnet synchronous motor frequency conversion soft start and grid connection device and a control method. The device comprises a power supply grid (1), a permanent magnet synchronous motor (2), three-phase contactors (3), (4) and (5), a variable frequency controller composed of a rectifier (6), an inverter (7) and a control panel (8), a voltage sampling module (9), a current sampling module (10) and a filter inductor (11) at the output end of the inverter. One end of the three-phase contactor (3) is connected with a three-phase inlet wire of the power supply grid (1), and the other end of the three-phase contactor (3) is connected with the input end of the rectifier (6); one end of the three-phase contactor (4) is connected with the output end of the inverter (7), and the other end of the three-phase contactor (4) is connected with the input end of the motor (2); and one end of the three-phase contactor (5) is connected with a three-phase inlet wire of the power supply grid (1). VF open-loop pre-synchronization control is introduced in advance in vector control, power grid synchronization conditions are simulated, a motor is enabled to actively match power grid magnetic field parameters before grid connection, smooth transition of a control mode is realized, and large impact current and electromechanical oscillation are avoided.

An electrically powered aircraft is configured to check the health of its motors by determining a flux linkage associated with each of the motors. The flux linkage may be determined by measuring the back-EMF of stator coils of the motor. The flux linkage may be measured while the motor is not powered or may be estimated when the motor is in use. The flux linkage of a motor may be compared to a corresponding threshold value to assess whether the magnet(s) of the motor have degraded to a point at which they pose safety concerns. The flux linkage values may also be used to project when the motor needs to be maintained and / or replaced. The flux linkage value of a motor may be displayed, along with historical flux linkage values for that motor, to show a magnitude of demagnetization of the magnet(s) of the motor.

The invention provides an oil pump motor low-temperature starting method, device and equipment and a storage medium, and relates to the technical field of motor control. Whether an oil pump motor reverse rotation instruction is sent to the vehicle or not is judged according to the first oil temperature and a vehicle gear state signal, if yes, the oil pump motor is controlled to conduct reverse rotation, then whether the state of the oil pump motor in the reverse rotation state reaches a preset condition or not is judged, and if yes, the oil pump motor is controlled to stop reverse rotation, and the vehicle is started. And finally, responding to the forward rotation starting instruction of the oil pump motor, and controlling the oil pump motor to start. Therefore, before the forward rotation starting instruction is sent to the oil pump motor, the oil pump motor is controlled to rotate reversely, the oil temperature is increased, and the oil viscous resistance is reduced, so that the probability of successful starting of the oil pump motor is increased. Therefore, the problem that when the temperature of the environment where the vehicle is located is low, motor starting fails due to the fact that the viscous resistance of oil is large is solved.

The invention discloses a filter circuit, a household electrical appliance, a control method and a computer readable storage medium, the filter circuit comprises a first resistor and a first capacitor, two ends of the first resistor are respectively connected with a first live wire end and a second live wire end, the first resistor is connected in series with the first capacitor, and two ends of the first capacitor are respectively connected with the second live wire end and a zero line end. The two ends of the first capacitor form output ends used for being connected with the motor, and the filter circuit is configured to form a charging loop through the first live wire end, the first resistor, the first capacitor and the null line end to charge the first capacitor, and form a power supply loop through the second live wire end, the motor and the null line end to supply power to the motor when the first capacitor meets a preset charging condition. According to the filter circuit, the first resistor connected in series with the first capacitor can reduce the current for charging the first capacitor, when the motor is powered, the current for charging the first capacitor is very small, the first capacitor is not damaged, and the filtering effect is not influenced because the first resistor is not connected.

A power tool includes a housing, a motor, and an actuator configured to be actuated by a user to cause the motor to operate. The power tool includes a depth sensor located adjacent to the output drive device and configured to generate a distance signal. The power tool includes an electronic controller coupled to the actuator and to the depth sensor. The electronic controller determines a first distance between the depth sensor and the workpiece by monitoring the distance signal from the depth sensor during operation of the motor. The electronic controller determines that the first distance has decreased to be less than or equal to the predetermined threshold distance. The electronic controller changes how the motor is controlled to operate in response to determining that the first distance has decreased to be less than or equal to the predetermined threshold distance.

The invention discloses a motor and a control method and device thereof, a fan, an air conditioner, a storage medium and a computer program product, and the method comprises the steps: taking the preset starting current of the motor as the current starting current of the motor in the starting stage of the motor under the condition that the motor is started for the first time; controlling the motor to start with the current starting current of the motor; in the process of starting with the current starting current of the motor, current interference parameters of the motor are obtained; wherein the current interference parameter of the motor is a parameter of a signal which is detected from a power supply side of a three-phase stator winding of the motor and has interference on the current starting current of the motor; and controlling the starting process of the motor according to the current starting current of the motor and the current interference parameter of the motor. According to the scheme, the current starting current of the motor is automatically adjusted by detecting the current interference signal of the motor, interference is reduced, and the motor starting success rate is increased.

A method for detecting movement of a vehicle body component moveable by an electric motor having a rotor and a three-phase stator, and a motor vehicle. The method includes: loading two stator phases with a pulse-width-modulated voltage and maintaining a third stator phase at a free-floating state; monitoring the third stator phase as a measuring point for an inductive voltage divider formed using the two stator phases; and detecting movement of the vehicle body component when an electric signal at a measuring point or a variable derived from the electric signal exceeds a specified threshold value. The motor vehicle includes a control device that is operable to perform the method.

The invention belongs to the technical field of motor control, and discloses a control method for switching an open loop to a closed loop of a permanent magnet synchronous motor, which is used for switching the permanent magnet synchronous motor from speed loop open-loop operation to rotating speed current double-closed-loop operation. Calculating an included angle delta between the shafting of the virtual synchronous rotating coordinate system dvirqvir and the shafting of the real rotor synchronous coordinate system dq; and then instantaneous switching of a command value of a current regulator, instantaneous switching of a current space voltage vector, switching of an angle variable used by coordinate transformation, initialization of a previous value of a low-pass filter, initialization of an integral term of the current regulator and initialization of an integral term of a speed regulator are executed in sequence, and open-loop switching and closed-loop switching of the permanent magnet synchronous motor are completed. According to the invention, the switching time is effectively shortened, and the switching stability and universality are improved.

The motor control device includes: a control signal generation unit 512, generating a motor control signal for supplying drive power to a drive motor 60; an advance angle value setting unit 514, setting a control advance angle value θa for advancing a phase of the motor control signal; and an operation state detection unit 513, detecting an operation state of the opening and closing body. The advance angle value setting unit 514 sets the control advance angle value θa in accordance with the operation state of the opening and closing body detected by the operation state detection unit 513.

The invention relates to the technical field of motor control, in particular to an open-loop control method of a Hall motor, which comprises the following steps of: configuring open-loop control parameters of the Hall motor; recording a closed-loop feedback speed in a closed-loop control process in real time, and judging whether the Hall sensor has a fault or not; when the Hall sensor breaks down, the closed-loop control is switched into open-loop control, and the method comprises the steps that according to the preset open-loop target speed and the open-loop acceleration, the open-loop expected speed is obtained through a ramp function; acquiring an open-loop electrical angle; whether the open-loop electrical angle is larger than 60 degrees or not is judged, if the open-loop electrical angle is larger than 60 degrees, the direction of the Hall sector is switched, and the open-loop electrical angle is reset; and calculating an open-loop output duty ratio according to the open-loop expected speed and the open-loop proportionality coefficient. During application, when the Hall sensor breaks down, closed-loop control is switched into open-loop control, and the rotating speed of the motor is smoothly adjusted to the target rotating speed, so that the motor can still operate normally when the Hall sensor breaks down.

The invention discloses an electric tool and a control method thereof. The electric tool includes: a functional member; the motor assembly comprises a first motor and a second motor, and at least one of the first motor and the second motor drives the functional part to work; the power supply device is connected with the motor assembly and at least supplies power to the motor assembly; a transmission relation exists between the first motor and the second motor, and when the first motor rotates, the second motor is driven to rotate. The electric tool further comprises a controller connected with the motor assembly, and the controller is configured to control the second motor to start based on the back electromotive force of the second motor after the first motor is started; the scheme can effectively improve the starting success rate of the motor of the electric tool and guarantee smooth work of the tool.

The invention discloses a position-sensorless heavy-load starting method for a permanent magnet synchronous motor. The method comprises the following steps: establishing a discrete current model of the permanent magnet synchronous motor in a two-phase static coordinate system under the excitation of a high-frequency square wave signal; injecting the six-pulse voltage into the permanent magnet synchronous motor based on a three-phase static coordinate system to carry out rotor magnetic pole identification so as to correct the initial electrical angle of the rotor, and further obtaining a rotor position error signal in combination with a discrete current model; a rotor position error signal is processed through an improved phase-locked loop control system based on model reference self-adaption, and then the finally estimated rotating speed and electrical angle of the rotor are obtained; and then inputting the signal as a feedback signal into a magnetic field orientation control system to realize position-sensorless closed-loop starting control of the permanent magnet synchronous motor under a heavy load condition. By means of the method, the reliability of the starting process and the stability of a control system can be remarkably improved, and therefore reliable position-free closed-loop control under the low-speed large-load working condition and even within the full-speed domain range is achieved.

A BLDC motor system having a power stage, a hall sensor and a logical control circuit is discussed. The BLDC motor system improves performances by judging an initial rotation direction through the back electromotive force generated by the stator together with the induced signal sensed by the hall sensor.

The present invention discloses an electric control device of a hauling vehicle and a hauling vehicle. A leakage detection module is provided to detect the insulation resistance value of the power supply circuit of the oil pump motor before the oil pump motor of the hauling vehicle is started. When the control module receives a start command and the insulation resistance value is greater than a preset insulation resistance value, the control power supply is controlled to supply power to the oil pump motor to start the oil pump motor and the leakage detection module is controlled to stop working, so as to avoid introducing the power supply current of the oil pump motor into the leakage detection module and causing damage to the leakage detection module. The temperature acquisition module and the current acquisition module are respectively used to detect the temperature and power supply current of the oil pump motor of the hauling vehicle, and when the temperature exceeds the preset temperature or the power supply current is not within the preset current range, the control power supply is controlled to stop supplying power to the oil pump motor to stop the oil pump motor and the leakage detection module is controlled to start working, thereby ensuring the safety and stability of the oil pump motor before and after starting, and protecting the safety of underground workers.

A power converter is configured to measure an output current and to determine a multiphase voltage reference as a function of the output current. Within the same switching period the voltage reference is determined, a modulation routine determines a modulation index for each phase of the output voltage. In some instances, one or more phases must start modulation during the switching period before the new modulation index is determined. The modulation routine stores the value of the modulation index generated from the prior switching period and uses the stored value when a new value is not yet ready. An offset value for the phase voltage which used a modulation index from the prior switching period is determined in order to compensate the phase voltages of the other phases and to maintain a desired line-to-line voltage output from the power converter.

A control method, control apparatus and control system for an electric motor, and a computer-readable storage medium are provided. The control method for an electric motor includes: acquiring an initial rotation speed and an initial rotation direction of an electric motor; determining a target start mode for the electric motor according to the initial rotation speed and the initial rotation direction; and according to the target start mode, controlling the electric motor to start. A target start mode, which most conforms to an initial rotation speed and an initial rotation speed direction of an electric motor, can be determined from a plurality of preset start modes, so as to control the electric motor to start.

A motor starting control method, device, and system, the method including: accumulating electrical parameter to obtain accumulated electrical parameter values, which are alternately assigned to a direct-axis electrical parameter and quadrature-axis electrical parameter; accumulating an angular increment to obtain accumulated values of a forced-driving angle; generating a control signal for a motor based on real-time values of the direct-axis electric parameter, quadrature-axis electrical parameter, and forced-driving angle; the control signal drives the motor; repeating said steps until the direct-axis electrical parameter or the quadrature-axis electrical parameter reaches a target electrical parameter, and then continuing accumulating to obtain the accumulated values of the forced-driving angle while forcibly driving the motor based on the corresponding control signal; when the real-time value of the forced-driving angle stays in sync with the rotor angle, the motor completes the startup; the motor is driven by alternately applying two perpendicular forces to the rotor.

The application provides a direct-current motor, a starting control method and device thereof, an air conditioner and a storage medium. The method comprises the following steps: detecting that the controller of the direct-current motor is powered on, obtaining an initial duty cycle corresponding to the direct-current motor pre-stored in the controller; when the initial duty cycle is zero, self-learning the initial duty cycle to obtain a target duty cycle; and controlling the starting of the direct-current motor according to the target duty cycle. The application obtains the target duty cycle, i.e. the optimal starting voltage of the direct-current motor, by self-learning the initial duty cycle when the initial duty cycle is zero, and controls the starting of the direct-current motor according to the target duty cycle when the starting instruction of the direct-current motor is received, so as to avoid the problems of excessive starting voltage or too small starting voltage, excessive starting vibration of the direct-current motor, speed overshoot and delay in starting of the motor, and the problem of poor control of the motor and the controller caused by replacement of the motor or the controller, thereby improving the stability and reliability of the direct-current motor during starting.

To provide a technique capable of holding energization in an electric motor with a simple configuration even after a manual switch for a reciprocating tool is turned off.SOLUTION: A reciprocating tool includes a reciprocating member, an electric motor, a transmission device, a drive circuit, a first manual switch, a switch element and a control circuit. A first contact point of the first manual switch is connected to a power supply, and a second contact point of the first manual switch is connected to the drive circuit. The first manual switch in its on state connects the first contact point to the second contact point. The switch element (i) is turned on when it receives an electric signal, and (ii) establishes electrical continuity between the first contact point and the second contact point in its on state. In response to at least the first manual switch being turned on, the control circuit continues to output the electric signal to the switch element until the drive of the electric motor is stopped.SELECTED DRAWING: Figure 6

The present invention relates to a method for starting a BLDC motor (10) with a trapezoidal shaped induction voltage under high load conditions using a modified two-level discrete fixed-time or fixed-frequency hysteresis current controller, the BLDC motor (10) being driven by an inverter bridge (30) with only one current sensor (20) placed on the busbar and controlled by a processing unit associated with an analog-to-digital converter, the novelty of which consists essentially in the fact that the intensity of the current (Im) of the BLDC motor is controlled by a two-level discrete fixed-time or fixed-frequency hysteresis current controller.

The embodiment of the invention discloses a control method and a control system of a permanent magnet motor, the permanent magnet motor is controlled to start by applying voltage to the permanent magnet motor in at least two stages, and at least one voltage amplitude in the later stage is higher than the voltage amplitude in the previous stage, that is, in the process of controlling the starting of the permanent magnet motor, the voltage amplitude is lower than the voltage amplitude in the previous stage. The amplitude of the voltage applied to the motor is controlled to be gradually increased by stages, so that the impact current can be reduced, smooth starting is realized, and the service lives of the permanent magnet motor and the traction inverter are prolonged. Under at least partial working conditions of locked-rotor, the switching frequency of a power device in a traction inverter connected with the permanent magnet motor is reduced, the conduction time and thermal stress of the power device are reduced, and effective locked-rotor protection is further provided. According to the technical scheme, the starting smoothness and locked-rotor protection of the permanent magnet motor can be considered at the same time, and the system reliability is improved.