Abstract: An induced draft fan, including: a housing, a wind wheel, an AC motor, and a controller. The controller includes: an AC-DC conversion circuit, a microprocessor, a Hall sensor, a drive circuit, and a relay. The input end of the AC-DC conversion circuit is connected to an external AC input, and the output end of the AC-DC conversion circuit supplies a DC current to each circuit part. The input end of the relay is connected to the external AC input, and the output end of the relay supplies power for corresponding parts. A magnetic ring is disposed on a rotating shaft of the AC motor. The Hall sensor is disposed close to the magnetic ring for detecting a signal of a rotational speed of the AC motor and inputting the signal of the rotational speed into the microprocessor. The microprocessor controls energization or deenergization of the relay.

Abstract: A motor controller, including: a microprocessor including a signal identification unit; an inverter circuit; a rotation speed detection circuit; a power module; and an isolation circuit. The power module supplies power for the microprocessor, the inverter circuit, the rotation speed detection circuit, and the isolation circuit. The isolation circuit is connected to the microprocessor via a pulse width modulation (PWM) input line, and a PWM signal is transmitted to the isolation circuit and the microprocessor successively via the PWM input line. One rotation speed input signal of a motor is transmitted to the signal identification unit of the microprocessor via the isolation circuit and the PWM input line. The signal identification unit determines whether an input signal of the PWM input line is the PWM signal or the one rotation speed input signal of the motor.

Abstract: A motor controller, including: a Bluetooth communication unit and a motor control unit. The Bluetooth communication unit includes: a power supply part, a Bluetooth module, and an interface circuit. The motor control unit includes an input port of a rotational speed adjusting signal. The power supply part supplies power to the Bluetooth module and the interface circuit. The Bluetooth module enables the motor control unit to communicate with an external device. The Bluetooth module inputs a PWM signal into the input port of the rotational speed adjusting signal of the motor control unit via the interface circuit.

Abstract: A method for acquiring a constant torque of an ECM, the method including: A) acquiring a target torque value T0 input from external; B) when the motor is in a non-use state, operating the motor and acquiring an initial rotational speed rpm by the microprocessor; and when the motor is in an operating state, acquiring a current rotational speed rpm by the microprocessor; C) calculating a corresponding target bus current value Itad by the microprocessor using the function of a DC bus current Itad=F(T, rpm) according to the target torque T0 and acquired rotational speed rpm, in which T represents a torque value output by the motor; and D) comparing the target bus current Itad with a real-time bus current Ibus by the microprocessor in a closed-loop control according to the detected real-time bus current Ibus.

Abstract: A motor controller, including: a control box, a control circuit board, a first press strip, a control chip, and a plurality of plastic press blocks. The control box includes: an inner wall, a bottom, and a cavity formed by the inner wall and the bottom. The control circuit board is disposed on the bottom of the control box. The control chip is disposed on an outer edge of a top face of the control circuit board. The plastic press blocks are disposed in a middle of an end face of the first press strip. Two ends of the first press strip and the inner wall of the control box are assembled together. The control chip is pressed on the inner wall of the control box via the plastic press blocks.

Abstract: A method for controlling a three-phase brushless DC motor including a single hall sensor, the method including: A) measuring a deviation angle ? of a mounting position of the single hall sensor and storing; B) starting the motor: outputting six-path PWM signals by the microprocessor to control the operation of the inverter and allowing the single hall sensor to continuously and stably measure a position signal; C) obtaining a rotating angular velocity ?=360°/T in the last 360° electric angle cycle by the microprocessor; D) calculating a real-time position angle ?=?t+? of a present 360° electric angle cycle by the microprocessor; and E) outputting the six-path PWM signals by the microprocessor to control the operation of the inverter so as to simultaneously energize the three-phase winding (U, V, and W); and switching a current direction of each winding.

Abstract: An interface circuit, including: a micro control unit (MCU), an isolated power supply, and a signal isolating circuit. The MCU, the isolated power supply, and the signal isolating circuit are integrated on a circuit board. The output end of the isolated power supply supplies power for circuits. The input end of the isolated power supply is connected to an external input power supply. The A/D conversion input port of the MCU is connected to the analog voltage signals. The MCU is configured to convert the analog voltage signals into pulse width modulation (PWM) signals or variable frequency signals with certain duty cycles, and output the PWM signals or the variable frequency signals to the input end of the signal isolating circuit. The signal isolating circuit is configured to output the PWM signals or the variable frequency signals with certain duty cycles.

Abstract: A motor controller, including: a Bluetooth communication unit and a motor control unit. The Bluetooth communication unit includes: a power supply part, a Bluetooth module, and an interface circuit. The motor control unit includes an input port of a rotational speed adjusting signal. The power supply part supplies power to the Bluetooth module and the interface circuit. The Bluetooth module enables the motor control unit to communicate with an external device. The Bluetooth module inputs a PWM signal into the input port of the rotational speed adjusting signal of the motor control unit via the interface circuit.

Abstract: A method for acquiring a constant torque of an ECM, the method including: A) acquiring a target torque value T0 input from external; B) when the motor is in a non-use state, operating the motor and acquiring an initial rotational speed rpm by the microprocessor; and when the motor is in an operating state, acquiring a current rotational speed rpm by the microprocessor; C) calculating a corresponding target bus current value Itad by the microprocessor using the function of a DC bus current Itad=F(T, rpm) according to the target torque T0 and acquired rotational speed rpm, in which T represents a torque value output by the motor; and D) comparing the target bus current Itad with a real-time bus current Ibus by the microprocessor in a closed-loop control according to the detected real-time bus current Ibus.

Abstract: An ECM motor, including: a motor controller and a motor body. A microprocessor of the motor controller is connected to a first temperature detecting unit and a second temperature detecting unit disposed at different positions outside the ECM motor for detecting temperatures at the different positions. In operation, when the temperature difference between the first temperature T1 and the second temperature T2 is smaller than or equal to a preset value T0, a first gear at the rotational speed S1 is selected by the microprocessor and the motor is controlled to run constantly in the first gear at the rotational speed S1. When the temperature difference between the first temperature T1 and the second temperature T2 is larger than the preset value T0, a second rotational speed S2 is selected by the microprocessor and the motor is controlled to run constantly in the second gear at the rotational speed S2.

Abstract: A multi-motor system, including a plurality of ECMs. The ECMs include a main ECM and a plurality of subordinate ECMs. A first temperature detection unit and a second temperature detection unit detect a temperature T1 and a temperature T2 at different positions, respectively; the main ECM automatically selects an operation parameter according to temperature differences between the temperature T1 and the temperature T2. The main ECM informs each subordinate ECM of the temperature T1 and the temperature T2, and each subordinate ECM selects an operation parameter according to the temperature T1 and the temperature T2. In operation, the main ECM informs each subordinate ECM of the temperature T1 and the temperature T2, and each subordinate ECM selects an operation parameter in accordance with the temperature T1 and the temperature T2.

Abstract: A DC permanent magnet synchronous motor, including: a motor body including a rotating shaft, a permanent rotor assembly, a stator assembly, and a housing assembly; a motor controller including a first microprocessor for drive control, an inverter circuit, and a detection circuit for detecting operating parameters of the motor; and an external control card including a second microprocessor for application control. The operating parameters of the motor are input into the first microprocessor by the detection circuit. The first microprocessor outputs a PWM signal to control the inverter circuit. An output end of the inverter circuit is connected to a coil winding. The external control card is disposed outside the motor body and is connected to the motor body via an electric wire. The second microprocessor and the first microprocessor are interconnected so that they can communicate.

Abstract: A method for increasing rotational speed range of an ECM motor, including: 1) starting the motor and initializing parameters; 2) reading the rotor position signal from the hall sensor by the microprocessor and updating the rotor angle; 3) reading the DC bus current I and the rotational speed n of the motor; 4) inputting a target rotational speed S from an external device, acquiring the target rotational speed S by the microprocessor, calculating the rotational difference e, and utilizing a rotational speed PI regulator to output a regulating parameter V_D; 5) calculating an advance angle ?=F(I, n) by the microprocessor, and calculating a real-time angle of the rotor ?=?×t by the microprocessor; and 6) calculating a PWM signal input into the inverter circuit, and outputting a PWM chopper voltage U by the inverter circuit, where U=F(V_D, ?+?).

Abstract: An electronically commutated motor, including: a motor body and a motor controller. The motor controller includes a control box and a circuit board disposed in the control box. The circuit board includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply. The gear detection circuit includes a plurality of current sensing units. The output end of the power supply supplies power to each circuit, and a first AC input end of the power supply is connected to a first power input line N. The gear detection circuit is connected to a plurality of gear input lines. At least one of the gear input lines is selected to be in an energized state. Each gear input line is correspondingly connected to a first input end of one of the current sensing units.

Abstract: A method for correcting torque including: presetting rotational speed of each gear by corresponding gear input lines of a microprocessor; providing a mechanism to select one rotational speed set; electing N power points within a range of the rated power, acquiring a set of torque data corresponding to each set of the rotational speed at each power point, and storing a total 2×N sets of torque data; allowing the motor to enter the torque correction mode; recording a steady torque Tadj when the motor operates in a steady state; and comparing the steady torque Tadj with a maximum gear torque Tmax, and selecting the set of torque data to which T[M]max belongs when the steady torque Tadj satisfies the relationship: 110%×T[M?1]max<Tadj?110%×T[M]max, M=1, 2, . . . , N; when M=1, T0max=0.

Abstract: A motor controller including a control box and a control circuit board disposed on the chamber of the control box. A control chip is disposed on the outer edge of the upper surface of the control circuit board. The outer wall of the control box is depressed inward to form a heat dissipation boss. A gap is formed between the bottom of the heat dissipation boss and the inner surface of the bottom of the chamber. The inner surface of the bottom of the chamber is provided with a plurality of supporting bosses. One outer edge of the control circuit board inserts into the gap, which enables the outer side surface of the control chip to cling to the inner side surface of the heat dissipation boss. The control circuit board is supported by upper surfaces of the supporting bosses.

Abstract: An electronically commutated motor, including: a motor body and a motor controller. The motor controller includes a control box and a circuit board disposed in the control box. The circuit board includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply. The gear detection circuit includes a plurality of current sensing units. The output end of the power supply supplies power to each circuit, and a first AC input end of the power supply is connected to a first power input line N. The gear detection circuit is connected to a plurality of gear input lines. At least one of the gear input lines is selected to be in an energized state. Each gear input line is correspondingly connected to a first input end of one of the current sensing units.

Abstract: A motor controller, including: a control box, a control circuit board, a first press strip, a control chip, and a plurality of plastic press blocks. The control box includes: an inner wall, a bottom, and a cavity formed by the inner wall and the bottom. The control circuit board is disposed on the bottom of the control box. The control chip is disposed on an outer edge of a top face of the control circuit board. The plastic press blocks are disposed in a middle of an end face of the first press strip. Two ends of the first press strip and the inner wall of the control box are assembled together. The control chip is pressed on the inner wall of the control box via the plastic press blocks.

Abstract: A brushless DC motor, including: a rotating shaft; a rotor assembly; a stator assembly; a casing; a rear cover; and a control box. The rotating shaft is connected together with the rotor assembly. The stator assembly is sleeved outside the rotor assembly. The casing is connected together with the stator assembly. The rear cover includes a rear bearing seat in the middle for receiving a rear bearing. A plurality of support legs protrudes outwards from a wall surface on the outer side of the rear bearing seat, and is supported and installed on a flanged edge folded outwards from an end surface of the casing. One end of the rotating shaft is supported on the rear bearing. The control box is installed on the casing.

Abstract: A motor controller, including: a control box (1), the control box (1) including a bottom, the bottom including a plurality of first bosses (11); a control panel (2); a plurality of IGBT modules (3); and a heat dissipation boss (12), the heat dissipation boss (12) including an end surface. The control panel (2) is disposed and fixed on the first bosses (11) by screws. The IGBT modules (3) are disposed on the control panel (2). The heat dissipation boss (12) is disposed on the bottom of the control box (1) outside the control panel (2). The IGBT modules (3) are attached to and fixed on the end surface of the heat dissipation boss (12) by a locking device.