20results about "Single phase motor control" patented technology

An electrical combination, a tool system, an electric motor, a battery pack, and operating and manufacturing methods. The tool may include a tool housing, a motor supported by the tool housing, the motor having a nominal outer diameter of up to about 80 millimeters (mm), the motor being operable to output at least about 2760 watts (W), and a tool terminal electrically connected to the motor; a battery pack including a pack housing defining a volume of the battery pack, the volume being up to about 5.2×106 cubic millimeters (mm3), battery cells supported by the pack housing, the battery cells being electrically connected and having a nominal voltage of up to about 80 volts (V), and a pack terminal electrically connectable to the tool terminal to transfer current between the battery pack and the tool; and a controller operable to control the transfer of current.

An electrical combination, a tool system, an electric motor, a battery pack, and operating and manufacturing methods. The tool may include a tool housing, a motor supported by the tool housing, the motor having a nominal outer diameter of up to about 80 millimeters (mm), the motor being operable to output at least about 2760 watts (W), and a tool terminal electrically connected to the motor; a battery pack including a pack housing defining a volume of the battery pack, the volume being up to about 5.2×106 cubic millimeters (mm3), battery cells supported by the pack housing, the battery cells being electrically connected and having a nominal voltage of up to about 80 volts (V), and a pack terminal electrically connectable to the tool terminal to transfer current between the battery pack and the tool; and a controller operable to control the transfer of current.

The present invention provides a motor brake control system. When a control circuit determines to brake, the control circuit controls a drive circuit to close a first upper bridge switch and a second upper bridge switch, and fully open a first lower bridge switch and a second lower bridge switch. After a period of time, the control circuit controls the drive circuit to close one of the first and second lower bridge switches, while keeping the other fully open. After a period of time, the control circuit controls the drive circuit to close the other of the first and second lower bridge switches, while fully opening one of the first and second lower bridge switches.

A motor drive controller for driving a brushless direct current motor includes a motor drive unit; a magnetic sensor for detecting a magnetic field generated by rotation of the motor and outputting the magnetic field as each of magnetic signals; and a bias adjuster for adjusting and outputting a bias voltage used in magnetic field detection by the magnetic sensor. The bias adjuster adjusts the bias voltage to a second voltage value lower than a first voltage value that allows the magnetic sensor to detect the magnetic field in a first period after a phase change of the magnetic signals. The bias adjuster also adjusts the bias voltage to a first voltage value in a second period from an end of the first period until a subsequent phase change of the magnetic signals.

One embodiment of the present application is a motor drive device including a first drive circuit that controls conduction periods of a first upper arm switch and a first lower arm switch connected to one end of a coil of a single-phase DC motor; a second drive circuit that controls conduction periods of a second upper arm switch and a second lower arm switch connected to the other end of the coil; a current detection circuit that detects a current flowing in the coil and outputs a current detection signal indicating a detection result of the current; a first protection circuit that determines whether an overcurrent occurs on the basis of the current detection signal and outputs a first enable signal indicating a determination result to the first drive circuit; and a second protection circuit that determines whether an overcurrent occurs on the basis of the current detection signal and outputs a second enable signal indicating a determination result to the second drive circuit. A first enable signal line through which the first enable signal is transmitted to the first drive circuit and a second enable signal line through which the second enable signal is transmitted to the second drive circuit are independent wirings from each other.

A magnetic induction yaw motor based on Hall effect comprises a fixing frame, a stator assembly, a rotor assembly, a detection unit and a control unit electrically connected to the detection unit; the rotor assembly comprises a mounting base, a motor shaft and a rotor body; the Hall sensor real-time detects the position of the rotor body and transmits the position information to the control unit; the control unit processes the data detected by the detection unit and controls the current input to the stator coil; the position of the rotor body is real-time detected by using Hall sensors, thereby obtaining the position information of the cutter head of the hair cutter device; the control unit controls the current input to the stator coil for accurately controlling the subsequent actions of the rotor body, so that the closed-loop motor control based on the feedback on the blade position is realized.

The invention relates to a drive system with a three-phase motor (M1), with a single-phase motor (M2) and with a control circuit. with three half-bridges (H1-H3) which are designed and configured to control the three-phase motor (M1), with three measuring resistors (R1-R3), preferably shunts (R1-R3), which are designed and configured to detect the currents of the three half-bridges (H1-H3), with a fourth half-bridge (H4) which is designed and configured to control the single-phase motor (M2), with a fourth measuring resistor (R4), preferably shunt (R4), which is designed and configured to detect the current of the fourth half-bridge (H4), wherein one of the three half-bridges (H1-H3) is designed and configured to control the three-phase motor (M1) and also to control the single-phase motor (M2), and with a control unit (S) which is designed and set up to operate the four half-bridges (H1-H4).

A drive circuit for a brushless motor is described. The drive circuit includes a converter for connection to a phase winding of the motor, and a controller. The converter includes a plurality of switches and the controller controls the states of the switches to configure the converter in one of a plurality of configurations. In a first configuration, current is permitted to flow through the phase winding in a first direction and in a second opposite direction. In a second configuration, current is permitted to flow through the phase winding in the first direction and is prevented from flowing through the phase winding in the second direction. The controller includes an input for receiving a signal indicative of current in the converter, and the controller configures the converter from the first configuration to the second configuration in response to a characteristic of the current.

Described herein is a gradient descent technique for adaptive commutation phase tuning in brushless motors (e.g., such as brushless BLDC motors). In an example embodiment, an integrated circuit (IC) controller for controlling a BLDC motor comprises a first control loop and a second control loop. The first control loop is configured to calculate a duty cycle based on a sensor signal received from a position sensor in the BLDC motor. The second control loop is configured to calculate an updated commutation timing based on a present commutation timing of the BLDC motor and a current measurement representing a current sensed at the BLDC motor. Based on the calculated duty cycle and the updated commutation timing, the IC controller is configured to continuously control commutation in the BLDC motor.

An electrical combination, a tool system, an electric motor, a battery pack, and operating and manufacturing methods. The tool may include a tool housing, a motor supported by the tool housing, the motor having a nominal outer diameter of up to about 80 millimeters (mm), the motor being operable to output at least about 2760 watts (W), and a tool terminal electrically connected to the motor; a battery pack including a pack housing defining a volume of the battery pack, the volume being up to about 5.2×106 cubic millimeters (mm3), battery cells supported by the pack housing, the battery cells being electrically connected and having a nominal voltage of up to about 80 volts (V), and a pack terminal electrically connectable to the tool terminal to transfer current between the battery pack and the tool; and a controller operable to control the transfer of current.

A method of starting a rotor of a single-phase claw-pole motor, wherein the claw-pole motor comprises a permanently excited rotor having a plurality of detent positions, wherein the rotor performs movement in a running direction in nominal operation, comprises an electronically commutated stator, and comprises a Hall sensor for determining relative rotor position is disclosed. The method comprises the steps of starting of the rotor by at least one commutation of a stator winding due to a Hall sensor signal and generating a plurality of commutations by means of pulse width modulated phase voltage based on a Hall sensor signal, wherein the Hall sensor is mounted on the stator or on an electronic circuit board and is arranged offset with respect to a center position of a stator pole in the direction of rotation.

The invention discloses a pre-driving circuit of a single-phase brushless direct current motor, which is characterized in that a pre-driver does not directly output GP1, but directly controls the on and off of a second PMOS (P-channel Metal Oxide Semiconductor) tube through the cooperation of a first driving pin FG and a first resistor between the source electrode and the grid electrode of the second PMOS tube, and meanwhile, the on and off of the second PMOS tube are controlled through the cooperation of the first driving pin FG and the first resistor; on and off of the first PMOS tube are controlled by a first resistor between the source electrode and the grid electrode of the third NMOS tube and the source electrode and the grid electrode of the first PMOS tube, so that a GP1 pin and a corresponding driving circuit on the pre-driver are reduced, and furthermore, GN1 and GN2 drive the two NMOS tubes respectively while the GN1 and GN2 drive the two NMOS tubes respectively. When an upper tube and a lower tube of a preceding stage GN1 / GN2 are both turned off, voltage drop on a third resistor is indirectly sampled through a second resistor between a source electrode and a grid electrode of the preceding stage GN1 / GN2, that is, current sampling is completed by multiplexing GN1 / GN2, so that CS pins on a pre-driver are reduced; therefore, the number of pins of the pre-driver and board-level connecting lines are reduced while the driving and current detection functions are reserved, and then the packaging cost of the pre-driver is optimized.

This invention discloses a voltage overload protection system and method for a motor pre-driver. The overvoltage protection circuit compares a first reference voltage with the shared voltage of the input single-phase motor to output a first comparison signal. When the control circuit determines, based on the first comparison signal, that the shared voltage is greater than the first reference voltage, the control circuit closes the first and second upper bridge switches and opens the first and second lower bridge switches within one phase time of the commutation signal of the single-phase motor. After the phase time ends, the control circuit alternately opens the first and second lower bridge switches according to the level of the commutation signal.

This application discloses the control of a single-coil BLDC motor. A motor driver 100 is provided for driving the rotor 211 of a single-coil motor 210 in a clockwise or counterclockwise rotational direction relative to the stator 212 of the single-coil motor 210. The motor driver 100 is adapted to generate a position signal representing the angular position of the rotor 211 relative to the stator 212 and includes a controller 120, which includes a direction input 150 to define the rotational direction of the rotor 211, and is adapted to generate a drive signal for rotating the rotor in the defined rotational direction, wherein the drive signal is based on the position signal and on a signal indicating an electrical lead angle, wherein the signal indicating the electrical lead angle is set such that the total lead angle is positive in both rotational directions of the rotor.

A commutation circuit (10) comprises a coil (70) connected to an H bridge (20), the H bridge (20) comprising four main switches (30, 40, 50, 60) for reversing polarity and a resulting coil current (IL) in the coil (70). The commutation circuit (10) further comprises a voltage source (110, 111) configured to generate a bypass current,and at least one auxiliary switch (140, 150, 160, 170, 180, 190, 210, 220, 230, 240, 250, 260, 270, 280) for controlling the bypass current to thereby decrease a switch current through at least one of the main switches (30, 40, 50, 60). By generating an appropriate bypass current with help of a voltage source (110, 111), a switch current through a desired main switch (30, 40, 50, 60) in a leading state can be decreased and eventually brought to zero. Zero current in its turn enables the use of thyristors as main switches (30, 40, 50, 60) as it results in the thyristors to be turned off automatically. Furthermore, decreased switch current at the switching moment reduces switching losses even in different types of switches such as GTOs and IGBTs.

A motor control circuit includes a phase adjuster configured to adjust a phase of a targeted position detecting signal that is present after a subsequent cycle of a reference position detecting signal based on (i) a timing at which a drive current detected by a current-zero point detector becomes zero and (ii) the reference position detecting signal; and a drive controller configured to control a timing at which a drive voltage varies such that the timing of the drive voltage varying matches a timing at which a phase of a targeted position detecting signal changes, and to output the drive voltage.

A current limit protection system and method for a motor pre-driver are disclosed. A current limit circuit detects a current of a resistor connected to a motor, and then compares the current of the resistor with a current threshold to output a current comparison signal. When a control circuit determines that the current of the resistor is greater than the current threshold according to the current comparison signal, and a duty cycle of a first signal of a first node or a second signal of a second node of the motor reaches a default value, the first upper bridge switch and the second upper bridge switch are turned off, and the first lower bridge switch and the second lower bridge switch are turned on alternately, so that the temperature of the motor is gradually reduced.

The application discloses a motor driving method and system. In the technical scheme of the application, the state of a bidirectional thyristor is controlled by outputting pulse width modulation signals (a first pulse width modulation signal, a second pulse width modulation signal, a third pulse width modulation signal and a fourth pulse width modulation signal) based on the direction of alternating current and the position signals (a first position signal, a second position signal, a third position signal and a fourth position signal) of a rotor in a single-phase synchronous motor by using a single-chip microcomputer, so as to start and continuously drive the single-phase synchronous motor. Compared with the starting and driving mode of multiple IGBT power devices, the mode of starting and driving the single-phase synchronous motor only by using the bidirectional thyristor can reduce the cost, the required computing power and the requirement for the single-chip microcomputer, and further reduce the cost.

The invention discloses a single-phase motor control method and system, and the method specifically comprises the steps: adjusting the output voltage amplitude and voltage phase of a drive circuit according to the real-time rotor position, and compensating a non-inductive control error of a single-phase motor; according to the commutation phase difference and the follow current duration in the commutation process of the single-phase motor, dynamically adjusting the output moment of the commutation signal through a logical algorithm, and combining the real-time rotating speed and the voltage vector parameter of the single-phase motor to finely adjust the commutation time so as to match the current working condition; according to the real-time rotor position, the commutation phase difference and the basic frequency of the single-phase motor, calculating a target frequency through a dynamic frequency compensation model; and dynamically adjusting the PWM signal slope according to the rotor position change rate of the single-phase motor to output a frequency converter control signal, and smoothly adjusting the working frequency of the single-phase motor to the target frequency. According to the invention, the problems existing in a traditional single-phase motor control method are effectively solved, and the speed regulation performance, the non-inductive control precision, the operation stability and the efficiency of the motor are improved.

The invention discloses an alternating current switch speed regulation method and circuit for a single-phase direct current motor, and relates to the technical field of speed regulation circuits, and the circuit comprises an alternating current switch, a rectifier bridge, a capacitor, a starting resistor, a voltage transformation output module, a special motor speed regulation chip and the single-phase direct current motor. After the alternating current switch is closed, alternating current is rectified and filtered by the rectifier bridge and the capacitor to obtain direct current high voltage, and a power supply capacitor connected with a power supply pin of the special speed regulation chip is charged through the starting resistor; when the voltage of the power supply pin rises to be high enough, the special speed regulation chip generates a pulse width modulation signal to drive the voltage transformation output module, and finally outputs direct current voltage to the single-phase direct current motor. The pulse width modulation signal is generated through the special speed regulation chip to drive the voltage transformation output module, the speed regulation function is achieved through an original alternating current switch, and therefore the integrated small-sized electric fan has the speed regulation function on the basis that the structure of the integrated small-sized electric fan of the single-phase direct current motor is not changed.