53results about "Single phase motor control" patented technology

To suppress power consumption by surely detecting phase switching timing of a magnetic signal and reducing a bias current during an unnecessary period without generating switching noise in a motor drive device.SOLUTION: A motor drive device 1 for driving a brushless DC motor comprises a motor drive section 3 which drives a motor 5, a magnetic sensor 6 by which a magnetic field generated by rotation of the motor 5 is detected and outputted as magnetic signals IN1 and IN2, and a bias adjustment section 4 by which a bias voltage to be used for the magnetic field detection of the magnetic sensor is adjusted and outputted. The bias adjustment section 4 adjusts the bias voltage to a second voltage value (VHB / a) lower than a first voltage value of a value at which the magnetic sensor can detect the magnetic field, during a first period after phase switching of the magnetic signals IN1 and IN2 and adjusts the bias voltage to the first voltage value (VHB) during a second period from the lapse of the first period to the next phase switching of the magnetic signals.SELECTED DRAWING: Figure 1

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 invention discloses a single-phase brushless motor control mechanism without attracting iron powder and a control method, and the mechanism comprises a motor body, a stepless speed change fan, a Hall sensor, a circuit board, a power circuit, a control circuit, a current-limiting protection circuit, a drive circuit, and a serial port. A period is reserved in the operation process of the motor to discharge metal dust, so that the problem of iron powder adsorption in an industrial environment is solved, and the motor has the advantages of high efficiency, durability, low maintenance and the like.

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.

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.

Described is a high-pressure washer (100) comprising:-a pump (40) and an electric motor (50) configured to drive the pump (40), where the pump (40) is connected to an inlet conduit (15) for liquid to be pressurized and to a delivery conduit (20) for liquid pressurized by the pump (40); -an electronic circuit (200) controlling the power supply of the electric motor (50); -wherein the electronic circuit (200) comprises an electronic control unit (60) operably connected to the electric motor (50); characterized in that the electronic circuit (200) is configured to vary the rotational speed of the motor (50) by varying the waveform of the current supplied to the motor (50) in order to vary the flow rate of the liquid pressurized by the pump (40) in the delivery conduit (20).

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.

A motor control system providing at least seventeen speed settings using industry standard control signals and an industry standard five pin speed connector. One speed monitoring pin transmits an output signal for monitoring the speed of the motor, and four speed setting pins receive input signals for setting the speed. One of the speed setting pins receives and decodes two binary states and two frequency states, thereby providing a total of thirty-two speed settings. A non-regulated isolated winding is added to an internal transformer to provide an internal isolated flyback power supply for the motor, thereby liberating a pin on the industry standard five pin speed connector to provide the fourth speed setting input pin. Transmission circuitry is associated with the speed monitoring pin, and the non-regulated isolated winding is used to provide a direct current bias to the transmission circuitry.

The utility model discloses a charge and discharge control circuit, a detection control boost circuit and an AC emergency fan lamp boost control circuit, and relates to the field of voltage regulation and control. The charge and discharge control circuit comprises a detection circuit, a charge and discharge management circuit, a discharge boost control circuit and an AND gate, the detection circuit generates a high-level detection signal if the alternating-current power grid is powered off when the alternating-current power grid needs to supply power; when the charging and discharging management circuit receives a high-level detection signal, if the energy storage element does not have undervoltage, a high-level low-voltage protection signal is generated; the AND gate generates an emergency opening signal according to the high-level detection signal and the high-level low-voltage protection signal; and when receiving the emergency starting signal, the discharge boost control circuit outputs a driving voltage duty ratio signal according to the detected discharge voltage of the energy storage element, so as to adjust the discharge voltage of the energy storage element and enable the discharge voltage to be output constantly. According to the invention, constant discharge voltage output of the energy storage element can be realized.

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.

The utility model discloses a magnetic induction yaw motor based on Hall induction, which comprises a fixing frame, a stator assembly and a rotor assembly, the stator assembly comprises a stator body and a stator coil, the rotor assembly comprises a mounting seat, a motor shaft and a rotor body, and two sides of the rotor assembly are connected with elastic pieces. The rotor assembly provides reset elastic force through the elastic piece when the rotor assembly transversely swings in a reciprocating mode, the detection unit comprises at least one Hall sensor, the Hall sensor is fixedly installed on the fixing frame or the stator body, the Hall sensor detects the position of the rotor body in real time, and the control unit is electrically connected with the detection unit. The current input into the stator coil is controlled through the control unit, the position of the mover body is detected in real time through the Hall sensor, so that the position information of a tool bit of the hair trimming equipment is obtained, and the current input into the stator coil is controlled through the control unit, so that the follow-up action of the mover body is accurately controlled. Therefore, closed-loop motor control based on blade position feedback can be completed.

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.

Systems and methods are provided for protecting a door system from damage by a back electromotive force (EMF) voltage generated when a door coupled to a door actuator is manually closed. The door system may include a driver configured to drive the door actuator to move the door, and a back EMF protection circuit. The back EMF protection circuit detects a back EMF voltage generated by the door actuator when the door is moved, and determines whether the back EMF voltage exceeds an overvoltage threshold. In response to determining that the back EMF voltage exceeds the overvoltage threshold, the back EMF protection circuit causes the driver to transition to an enabled state to short the back EMF voltage to ground.

The invention relates to a household appliance for operation on a fixed-frequency AC power grid (N, L), comprising at least one electric synchronous motor (M1, M2, M3, Mx), a frequency converter (1), a switching device (2) configured to selectively connect the at least one synchronous motor (M1, M2, M3, Mx) either to the frequency converter (1) or to the AC power grid (N, L), and a control unit (3) configured to connect the at least one synchronous motor (M1, M2, M3, Mx) to the frequency converter (1) by means of the switching device (2) in order to start the synchronous motor (M1, M2, M3, Mx), wherein the frequency converter (1) is operated at a frequency lower than the fixed frequency of the AC power grid (N, L), and, after the synchronous motor (M1, M2, M3, Mx) has started, to increase the frequency of the frequency converter (1), and the at least one Synchronous motor (M1, M2, M3,Mx) to be disconnected from the frequency converter (1) by means of the switching device (3) and connected to the AC mains supply (N, L).

A motor control device, according to an embodiment of the present invention, comprises: a switching unit including a first switch unit and a second switch unit; a first resistor connected to an output unit of the switching unit; and a control unit controlling a motor connected with the switching unit, wherein the second switch unit includes a plurality of unit switches and the control unit determines and controls the type of the motor by using at least one switch from among the plurality of unit switches and a current flowing through the first resistor.

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.

A protection circuit for an electric motor with a single phase winding, consisting of two coil sections with central tapping, wherein the two coil ends of the coil sections are each connected to ground via a switching element. The task of the invention is for an electric motor of this type to ensure a thermal relief for the switching elements, improved and smoother running, reduced warming of the printed circuit board, improved EMC characteristics, a more robust design of the overall switching, a focused conduction of the losses and an extra protection against any surge impulses from a mains network.

The invention provides a motor drive device and a motor drive control method, in the motor drive device, the phase switching timing of a magnetic signal is reliably detected, the switching noise is not generated, the bias current in an unnecessary period is reduced, and the power consumption is suppressed. A motor drive device (1) for driving a brushless DC motor is provided with: a motor drive unit (3) for driving a motor (5); a magnetic sensor (6) that detects a magnetic field generated by rotation of the motor and outputs the magnetic field as magnetic signals (IN1, IN2); and a bias adjustment unit (4) for adjusting and outputting a bias voltage used when the magnetic sensor detects the magnetic field, the bias adjustment unit adjusting the bias voltage to a second voltage value (VHB / a) lower than a first voltage value, which is a value at which the magnetic sensor can detect the magnetic field, during a first period after phase switching of the magnetic signals (IN1, IN2). The bias voltage is adjusted to the first voltage value (VHB) during a second period from the elapse of the first period to the next phase switching of the magnetic signal.

The present invention relates to a method and system for generating a single-phase motor drive signal. The method comprises: in the last Hall cycle, predicting the time length of the current Hall cycle in advance according to the output signal of a hysteresis comparator; in the last Hall cycle, determining the time length of each step of the current Hall cycle in advance according to the time length of the current Hall cycle and a preset total number of steps; at each moment of the current Hall cycle, generating a sine wave code value of the current Hall cycle at that moment according to the output signal of the hysteresis comparator, the time length of each step of the current Hall cycle and a preset sine lookup table; at each moment of the current Hall cycle, determining the drive signal at that moment according to the sine wave code value at that moment.

The present invention discloses a motor current control circuit with a voltage detection mechanism. The first end of a first lower-bridge transistor is connected to the second end of a first upper-bridge transistor. A node between the first end of the first lower-bridge transistor and the second end of the first upper-bridge transistor is connected to the first end of the motor. The first end of the second lower-bridge transistor is connected to the second end of the second upper-bridge transistor. A zero-current detection circuit detects the voltage at the node to determine whether the current flowing through the motor is zero, thereby outputting a current detection signal. Based on the current detection signal, a control circuit controls a drive circuit to turn on or off each of the first upper-bridge transistor, the first lower-bridge transistor, the second upper-bridge transistor, and the second lower-bridge transistor.

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 relates to a protective circuit of an electric motor with a single-phase winding (3), consisting of two coil sections (5, 6) with a centre tap (7), wherein the two winding ends of the coil sections (5, 6) are connected to earth (10) via a switching element (8, 9) in each case. The problem addressed by the invention is that of ensuring thermal relief of the switching elements, an improved running smoothness, reduced heating of the printed circuit board, an improved EMC behaviour, a more robust design of the overall circuit, targeted conduction of the losses and additional protection against other overvoltage pulses from a supply network in the case of an electric motor of the generic type. According to the invention, this problem is solved by the features of claims 1, 11 and 14.

The present invention is applicable to a motor driving device, and relates to a device for driving, for example, a direct current motor (DC motor), a method for controlling same, and an electronic device configured to be driven by a motor. The present invention relates to a method for controlling initial driving of a motor. The method may comprise the steps of: checking whether a back electromotive force voltage is detected from the motor; detecting the back electromotive force voltage to check the speed and rotation direction of the motor; determining whether the checked rotation direction of the motor is the same as the rotation direction by a currently input command; and driving the motor on the basis of the determination result. The step of driving the motor may comprise: a forward control mode based on the case in which the checked rotation direction of the motor is the same as the rotation direction by the currently input command; and a backward control mode based on the case in which the checked rotation direction of the motor is opposite to the rotation direction by the currently input command.

A method for controlling the direction of rotation of a fluid machine having an oriented-blade impeller, comprising the following steps:starting (100) a synchronous electric motor which operates said fluid machine until the synchronous state is reached;driving (200) said synchronous electric motor at steady state by applying a phase cutting;applying (300) a phase cutting corresponding to a reference power, wherein said reference power is comprised between a first power required to keep the propeller rotating in a right direction and a second power required to keep the propeller rotating in a wrong direction, which is opposed to the right direction.

The invention discloses a motor driving method and system. The invention relates to a method. Pulse width modulation signals (a first pulse width modulation signal and a second pulse width modulation signal) are output through a single-chip microcomputer based on the direction of alternating current and position signals (a first position signal, a second position signal, a third position signal and a fourth position signal) of a rotor in the single-phase synchronous motor. Compared with a mode of starting and driving a plurality of IGBT power devices, the mode of starting and driving the single-phase synchronous motor only through the bidirectional silicon controlled rectifier has the advantages that the cost is reduced, and the reliability is improved. And moreover, the required computing power is reduced, the requirement on the single chip microcomputer is also reduced, and the cost is further reduced.