21results about "Stopping arrangements" patented technology

The application discloses a kind of permanent magnet synchronous motor electric shovel speed regulation system and motor control method, belong to mining equipment technical field, including: main transformer, rectification feedback unit, several permanent magnet synchronous motors, several frequency converters and voltage suppressor, by using permanent magnet synchronous motor as power source, the efficiency and power factor of motor in low speed area are higher, realize efficient, energy-saving green mining, electric shovel each mechanism can also adopt direct drive or half direct drive mode, reduce mechanism transmission series, further improve transmission efficiency and equipment reliability;Since the rotor of permanent magnet synchronous motor is permanent magnet, when the frequency converter fails and the brake fails at the same time, the motor will generate back electromotive force when being pulled by potential energy load, according to the power generation characteristics of permanent magnet synchronous motor, the stator is short-circuited through energy consumption device, which will generate braking torque in permanent magnet synchronous motor, so as to brake the bucket, avoid the bucket falling rapidly, electric shovel out of control accident.

A method for operating a power tool includes electronically braking a motor shaft of a brushless electric motor using a controller of the power tool. A spindle unit, positioned on the motor shaft, has a known rotational position relative to at least one pole of a plurality of poles of a rotor of the motor shaft. The method further includes stopping the motor shaft, using the controller, in a predetermined rotational position relative to a stator of the electric motor based on a detected position state of a plurality of position states as detected by a plurality of position sensors of the electric motor. The plurality of position states identify a rotational position of the rotor relative to the stator, and at the predetermined rotational position, a spindle lock of the power tool is configured to engage the spindle unit without additional rotation of the motor shaft.

A switching range control device (40) mounted on a vehicle for switching a switching range by controlling a drive actuation of a motor (10), wherein the switching range control device (40) comprises: a feedback control device (60) which performs feedback control based on an actual angle (Cen) of the motor (10) and a motor speed (Msp) corresponding to a rotational speed of the motor (10); a feedback value setting unit (63) which sets a feedback value of the motor speed based on the motor speed (Msp) to advance an excitation phase; a current sensor (81, 82) which detects a motor current (Im) flowing through the motor (10);and a current correction unit (84) which corrects a target motor speed (Msp*) corresponding to a target motor speed (10) determined based on a demand switching range, wherein: a temperature of a coolant used in the vehicle is defined as a coolant temperature (Hc); a temperature of an oil used in the vehicle is defined as an oil temperature (Ho); an outside air temperature is defined as an outside air temperature (Ha); the motor current (Im), which is set based on a preset temperature (Hs), is defined as a normalized motor current (Im_N);The current correction unit (84) corrects the motor current (Im) to match the normalized motor current (Im_N) when at least one quantity from the coolant temperature (Hc) and the oil temperature (Ho) and the outside air temperature (Ha) coincides with the set temperature (Hs), and the current correction unit (84) estimates a temperature of the motor (10) based on the motor current (Im) and the normalized motor current (Im_N).

The utility model discloses a motor electronic brake protection circuit, motor controller and motor equipment relates to electronic technical field. Control switch module's control end connects brake signal end, and control switch module's input end connects the power switch tube control end of upper bridge arm in motor drive circuit, and control switch module's output end is grounded, the input end of first switch tube module connects brake signal end, and the output end of first switch tube module connects the power switch tube control end of lower bridge arm in motor drive circuit, and first switch tube module from brake signal end to the unidirectional conduction of power switch tube control end of lower bridge arm, the power switch tube control end of every phase electric lower bridge arm in motor drive circuit and the drive signal generation end of corresponding connection between setting a second switch tube, and the unidirectional conduction of second switch tube from the drive signal generation end of connection to the power switch tube control end of connected lower bridge arm. Like this, try to avoid the damage of motor drive circuit and electronic brake function circuit.

The invention relates to a method for braking a rotating brushless DC motor (2) of an electrically driven machining device (1), in particular for achieving a standstill of the DC motor (2), wherein the DC motor (2) can be controlled by means of a bridge circuit (3) of the machining device (1) to perform electronic commutation, - wherein the method comprises: - providing a rotational speed variable (nG) representative of a rotational speed (n) of the DC motor (2), in particular repeatedly, and - braking the rotating DC motor (2) by varying a duty cycle (D) of a pulse-duration modulation (PDM) when controlling the bridge circuit (3), wherein the duty cycle (D) has values between 0 and less than 1, depending on the provided rotational speed variable (nG), if the rotational speed (n) is greater than 0.

To provide a motor control device which prevents heat generation from deviating to a specific phase at the time of lock energization of a polyphase motor.SOLUTION: Motor control devices 351 to 354 include: a torque command calculation part 40 for calculating a torque command value Trq*; a current command value calculation part 50 for calculating a current command value I*; an inverter (power converter) 55; and a stop position adjusting device 67. The stop position adjusting device 67 executes "stop position adjusting processing" of adjusting a rotation stop position within a predetermined position adjusting range, at the time of lock energization of performing energization in a state where rotation of a polyphase motor 60 is stopped, except for a case of satisfying a predetermined application exception requirement. In the stop position adjusting processing, the stop position adjusting device 67 adjusts a rotation stop position so that a current is deviated to high heat dissipation phases of one or more phases having a relatively high heat dissipation property among each phase. The torque command calculation part 40 or the current command calculation part 50 calculates the torque command value Trq* or the current command value I* reflecting the rotation stop position after adjustment.SELECTED DRAWING: Figure 5

A method for starting an EC motor having a stator and a rotor, comprising the steps of determining a first position of the rotor when the rotor is stationary by means of discrete signal injection, accelerating the rotor by means of a controlled rotating field, determining a speed of the rotor on the basis of a back EMF after reaching a predetermined rotating field frequency, comparing the speed determined, with a first predetermined speed value, and, if the speed determined is greater than the first predetermined speed value, determining a second position of the rotor on the basis of the back EMF and changing to a closed-loop operation on the basis of the back EMF.

This case relates to a fault-detection system and method for current sensors, including a motor, three current sensors, and a controller. The three current sensors sense the three phase currents of the motor to obtain three current sensing values. The controller controls the three phase currents of the motor. When the sum of the three current sensing values ​​is greater than a threshold, the controller controls the three phase currents to zero and designates the current sensor with the largest difference from zero as the first offset sensor, which has a current offset. When the sum of the three current sensing values ​​equals the current offset, the controller designates the current sensor with the current sensing value closest to zero as the second offset sensor. If the first offset sensor and the second offset sensor are the same current sensor, the controller outputs a warning signal.

The application discloses a safe torque off (STO) function circuit, a safety control device and a method, wherein the safe torque off function circuit comprises a first channel loop and a second channel loop, wherein the first channel loop and the second channel loop independently obtain a safety signal from any safety switch of an elevator safety loop or an elevator control system or any sensor of the elevator control system through software control, and the inverse bridge arm or the lower bridge arm drive signal is unblocked in response to the safety signal state after calculation. The application does not reduce the fault margin and safety of the STO while realizing electronic blocking. In addition, since the STO only blocks the upper bridge arm drive signal, the lower bridge arm can adopt the electrical braking method for improving braking torque disclosed in CN117997175A. In addition, the response time of the STO can be set by software, so as to be suitable for different safety loop forms.

The invention relates to a method for braking a rotating brushless DC motor (2) of an electrically driven processing device (1), in particular for bringing the DC motor (2) to a standstill, wherein the DC motor (2) can be electronically commutated by means of a bridge circuit (3) of the processing device (1), and wherein the method comprises: - providing a speed value (nG) representative of a speed (n) of the DC motor (2), in particular repeatedly, and - braking the rotating DC motor (2) by varying a duty cycle (D) of a pulse duration modulation (PDM) when controlling the bridge circuit (3), wherein the duty cycle (D) has values ​​between 0 and less than 1, depending on the provided speed value (nG), if the speed (n) is greater than 0.

The invention relates to a method for braking a rotating brushless DC motor (2) of an electrically driven machine tool (1), in particular for bringing the DC motor (2) to a standstill, wherein the DC motor (2) can be electronically commutated by means of a bridge circuit (3) of the machine tool (1), wherein the method comprises: braking the rotating DC motor (2) by varying a duty cycle (D) of a pulse duration modulation (PDM) when controlling the bridge circuit (3), wherein the duty cycle (D) has values ​​between 0 and less than 1 if a rotational speed (n) of the DC motor (2) is greater than 0, wherein the control is carried out such that for a minimum of 60%, in particular a minimum of 80%, in particular a minimum of 90% of a braking time (ZDb), in particular until standstill, a value of a field-generating current (Id) is at most twice as large, in particular a maximum of 1,5 times as large, in particular at most equal to or smaller than the value of a torque-generating current (Iq).

Provided are a power tool and a control method therefor. The power tool includes an operating switch; a motor that is connected to the operating switch and capable of starting in response to the conduction of the operating switch and braking in response to the disconnection of the operating switch; and a control circuit configured to control a working state of the motor. The control circuit includes a driver circuit including multiple switching elements; a controller that is coupled to the motor and capable of outputting a first control signal to control the motor to start; and a parameter detection unit for detecting a working parameter of the motor. The controller is configured to, in response to the operating switch being turned on again within a preset time after being turned off, acquire the working parameter and set a duty cycle of a second control signal according to the working parameter to control the motor to restart.

The present invention relates generally to a method for operating a brushless electric motor and a correspondingly designed electric motor. The electric motor can, in particular, be a component of an electromechanical braking device. The method for controlling the electric motor can include a control circuit and an emergency circuit arrangement, wherein in a normal operating mode the electric motor is controlled by the control circuit, and wherein in the event of a failure of the control circuit the control of the electric motor is taken over by the emergency circuit arrangement based on an emergency stop program.

A method for operating a brushless electric motor and a correspondingly designed electric motor is disclosed. The electric motor may be a component part of an electromechanical brake device. The method for controlling the electric motor can comprise an actuation circuit and an emergency circuit arrangement, wherein, in a normal operating mode, the electric motor is controlled by the actuation circuit, and wherein in the case of a failure of the actuation circuit, control of the electric motor is taken over by the emergency circuit arrangement based on an emergency stop program.

This invention provides a program recording device and its current protection detection method. The program recording device is used to read or write to a program recording interface. The program recording device includes a microprocessor, a programming drive circuit, and an overcurrent protection circuit. The microprocessor outputs a first or a second test signal. The programming drive circuit outputs a high drive voltage or a low drive voltage to the program recording interface. After the programming drive circuit outputs a low drive voltage for a predetermined time, it outputs a high drive voltage, causing the program recording interface to form a high impedance. After the program recording interface forms a high impedance, the overcurrent protection circuit receives the first test signal to trigger overcurrent protection, and then receives the second test signal to trigger low current protection. If the overcurrent protection and low current protection fail to trigger consecutively more than a predetermined number of times, the microprocessor determines that the current protection has failed.

This invention discloses a three-phase winding electromagnetic braking system for a brushless DC motor, comprising a DC power supply, a driver, a brake, three position sensors, and three sets of coils. The DC power supply supplies power to phases A, B, and C of the three-phase windings of the brushless DC motor through the driver. The three position sensors are used to monitor the rotor position of the brushless DC motor and are connected to the driver. The three sets of coils are connected in a star configuration, with their tail ends shorted together and connected to the negative terminal of the driver power supply. The starting ends of the three sets of coils are defined as phases A1, B1, and C1, respectively, and phases A1, B1, and C1 are connected to phases A, B, and C of the brushless DC motor, respectively. This invention achieves automatic unlocking upon motor start-up and automatic braking upon motor stop, possessing comprehensive technical advantages such as fast response, stable braking, long lifespan, and high safety. It is a preferred solution for "high-performance braking" in brushless DC motors and can be widely applied in fields with high requirements for braking safety and stability.

The invention provides an electronic circuit for powering a coil or a set of coils of an electromagnetic motor. The electronic circuit comprises a normal operation circuit, which is used during a normal operation mode, a braking circuit, which is used during an emergency mode, and a switching device for switching between the normal operation mode and the emergency mode. In the normal operation mode, the electronic circuit is configured to supply power to the coil or the set of coils. In the emergency mode, the electronic circuit is configured to short-circuit the coil or the set of coils in a way across the braking circuit. The braking circuit is arranged to generate a negative resistance or negative impedance to increase the braking force.

Method for starting an EC motor comprising a stator and a rotor, comprising the steps: a) determining a first position of the rotor at rest by means of discrete signal injection (101); b) accelerating the rotor by means of a controlled rotating field (103); c) determining a rotational speed of the rotor based on a back EMF after reaching a predetermined rotating field frequency in step b) (105); d) comparing the rotational speed determined in step c) with a first predetermined rotational speed value (107); and e) if the rotational speed determined in step c) is greater than the first predetermined rotational speed value: determining a second position of the rotor based on the back EMF and switching to closed-loop operation based on the back EMF (109).

The invention relates to a method for braking a rotating brushless DC motor (2) of an electrically driven processing device (1), in particular for bringing the DC motor (2) to a standstill, wherein the DC motor (2) can be electronically commutated by means of a bridge circuit (3) of the processing device (1), and wherein the method comprises: - detecting a current quantity (IG) representative of a current (I) of the DC motor (2), in particular repeatedly, and - braking the rotating DC motor (2) by varying a duty cycle (D) of a pulse duration modulation (PDM) when controlling the bridge circuit (3), wherein the duty cycle (D) has values ​​between 0 and less than 1, depending on the detected current quantity (IG), if a rotational speed (n) of the DC motor (2) is greater than 0.

This invention relates to a synchronous electric device and its starting method. The device includes at least a control component, a first rotor, and a second rotor. The first rotor has a first working winding for driving the second rotor to rotate. When the first rotor rotates to its rated speed, alternating current is applied to the first working winding, generating a rotating magnetic field. The control component sets the rotational speed of the air gap magnetic field between the first and second rotors to a minimum value. The control component adjusts the speed of the first rotor in a manner that gradually increases the rotational speed of the air gap magnetic field between the first and second rotors from its minimum value. Thus, the first rotor provides electromagnetic torque to the second rotor, synchronizing the speed of the second rotor with the rotational speed of the air gap magnetic field. This invention makes three-phase permanent magnet synchronous motors easier to start, reduces the cost of starting three-phase permanent magnet synchronous motors, and minimizes starting shock.