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: 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 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 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 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.