Abstract: A fan coil unit, including: a blower including a volute, a wind wheel, and a motor; a fan housing; a heat exchanger; and a hydrostatic plate. The volute includes a first chamber, a first air inlet, and a first air outlet. The wind wheel is disposed in the first chamber of the volute. The motor includes an output shaft which extends into the first chamber and is connected to the wind wheel. The fan housing includes a second chamber, a second air inlet, and a second air outlet. The heat exchanger is disposed in the second chamber and is located between the second air inlet and the second air outlet. The volute further includes a volute tongue which is close to the first air outlet. The hydrostatic plate is connected to the volute tongue. The hydrostatic plate includes an upper end and a lower end.

Abstract: A constant torque control method for a permanent magnet synchronous motor. The method includes: 1) starting a motor; setting a torque T of the motor; calculating a given current iq_limit on a q-axis based on the torque T; setting a target current iq_A on the q-axis to be equal to the given current iq_limit; and allowing the motor to operate in a constant torque control mode by a current-based proportional integral (PI) controller on the q-axis; 2) presetting a reference speed Vref1 of the motor; measuring a real-time speed V of the motor; when the real-time speed V is less than the reference speed Vref1, increasing an extra current delta_iq to the given current iq_limit to intervene the real-time speed V of the motor; and 3) measuring the real-time speed V of the motor; and calculating a speed difference Err=V?Vref2.

Abstract: A method of starting a sensorless BLDC motor. The method includes: providing a stator flux rotating coordinate system including a ds-axis and a qs-axis, selecting a voltage Vds on the ds-axis, allowing a voltage Vqs on the qs-axis to be 0, and resetting a to-be-started motor to a preset position; providing a flux ? to the motor, allowing the current Iqs on the qs-axis to rise, maintaining the flux constant, calculating a real-time torque T1 according to the torque/current closed loop on the qs-axis, comparing a preset starting torque T0 with the real-time torque T1, performing the torque/current closed-loop control until the real-time torque T1 reaches the preset starting torque T0; and continuously raising the real-time torque according to the torque/current closed loop to operate a load, measuring a real-time rotation speed V1, comparing a preset starting rotation speed V0 with the measured real-time rotation speed V1.

Abstract: A method for outputting constant air volume by a fan system including at least two brushless DC (BLDC) motors, the method including: storing a constant air volume control function Q=F (n, C) in a data processor, where Q indicates an air volume, n indicates a rotational speed of the BLDC motors, and C indicates an operating parameter of the BLDC motors; transmitting, by the data processor, identical speed signal commands to the BLDC motors, and allowing the BLDC motors to operate at equal or approximately equal rotational speeds; and feedbacking, by the BLDC motors, motor operating parameters C to the data processor, calculating, by the data processor, a motor speed n for outputting and maintaining a constant air volume, and transmitting the motor speed to the BLDC motors.

Abstract: A method for correcting a compensation item of a PMSM motor, the method including: offline measuring an error data of a parameter of a PMSM motor in a control process; providing a series of current commands and calculating compensation values of the parameter corresponding to the series of current commands; establishing a lookup table with regard to the series of current commands and the compensation values of the parameter corresponding to the series of current commands; storing the lookup table in a memory of a motor controller; starting and allowing the motor to work at a normal state; and online correcting the error data of the parameter by using the lookup table.

Abstract: An external rotor motor, including: a rotary shaft; a plastic-packaged stator including a sleeve base, a stator core, a terminal insulator, coil windings, and a plastic-packaged body; and an external rotor sleeving on the plastic-packaged stator. The terminal insulator is disposed on the end face of the stator core. The coil windings are coiled on the terminal insulator. The sleeve base is disposed in an axle hole in the center of the stator core. The rotary shaft is disposed in the sleeve base. Two ends of the rotary shaft are supported by the bearing. One end of the rotary shaft protrudes out from the sleeve base and is connected to the external rotor. The top of the sleeve base extends outwards to form a plurality of arms, and the plurality of arms each includes an outer end which is provided with a bolt.

Abstract: A blower, including: a volute including air inlets and an air outlet; a wind wheel disposed in the volute; and air collectors. Each air collector includes a curved air guide. The air inlets are disposed at two sides of the wind wheel, respectively. The air collectors correspond to the air inlets. The curved air guide extends into the volute, and the inner diameter of the curved air guide decreases stepwise. The relationship between a minimum inner diameter D0 of the curved air guide and an inner diameter D1, an outer diameter D2 of the wind wheel fulfills the following formula: D1+?(D2?D1)?D0?D1+?(D2?D1). An exhaust fan that includes the blower is also provided.

Abstract: A method for controlling air volume of an electric device to be constant, the device being adapted to exhaust or supply air, the method including: A) establishing M constant air volume control functions Qi=F(n) corresponding to M air volume points CFMi in the microprocessor of the system controller; B) allowing the microprocessor to receive or preset a target air volume IN-CFM; C) starting the motor, when the motor operates in a stable state, comparing M air volume points CFMi with the target air volume IN-CFM, and ensuring that the target air volume IN-CFM falls within two known air volume points CFMi and CFMi?1; D) using the two known air volume points CFMi and CFMi?1 to calculate a constant air volume control function Q0=F(n) corresponding to the target air volume IN-CFM by interpolation method; and E) controlling a motor parameter Q0 and a rotational speed n.

Abstract: An external rotor motor, including a rotary shaft, a plastic-packaged stator, and an external rotor. The plastic-packaged stator includes a sleeve base, a stator core, a terminal insulator, coil windings, and a plastic-packaged body. The plastic-packaged stator is disposed in the chamber of the external rotor. The terminal insulator is disposed on the end surface of the stator core. The coil windings are coiled on the terminal insulator. The sleeve base is disposed in an axle hole of the stator core. The plastic-packaged body integrates the sleeve base, the stator core, the terminal insulator, and the coil windings. A plastic-packaged end plate is disposed on the plastic-packaged body on one side of the stator core. Bearing housings are disposed on two ends of the sleeve base. The rotary shaft is disposed in the sleeve base, and two ends of the rotary shaft are supported by bearings.

Abstract: An induced draft fan, including a volute including a chamber and an air discharge pipe; and a wind wheel disposed in the chamber of the volute. The wind wheel is connected to and operationally driven by a rotation shaft of a motor. The air discharge pipe is disposed on one side of the volute, and includes an inner pipe and an outer pipe surrounding the inner pipe. The inner pipe of the air discharge pipe communicates with the chamber, to form an air discharge passage. An annular groove is disposed between the inner pipe and the outer pipe; and the outer end of the outer pipe is provided with a curved groove, the curved groove extends axially and circumferentially to divide the outer pipe into a fixed part and a flexible part.

Abstract: A brushless direct current (DC) motor, including a motor body and a motor controller. The motor controller includes a control box and a control circuit board. The motor body is a plastic-packaged body including a rotary shaft, a rotor assembly, a plastic-packaged stator, a front cover, and a rear cover. The rotor assembly is disposed on the rotary shaft. The plastic-packaged stator is sleeved on the outer side of the rotor assembly. The front cover is disposed on the front part of the plastic-packaged stator. The plastic-packaged stator includes a stator core, a terminal insulator, coil windings, and a plastic-packaged shell. The terminal insulator is disposed on one end of the stator core. The coil windings are coiled on the terminal insulator. The plastic-packaged shell is adapted to connect the stator core, the terminal insulator, and the coil windings together.

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 permanent magnet DC (PMDC) motor, including: a motor body including a revolving shaft; a Hall sensing module; a gear reducer; and a gear assembly including an output shaft; and a magnet ring. The gear assembly is disposed in the gear reducer. The gear assembly is connected to and driven by the revolving shaft of the motor body. The magnet ring is disposed on the revolving shaft or on the output shaft of the gear assembly. The Hall sensing module is disposed on the gear reducer. The Hall sensing module is adapted to sense a signal of the magnet ring to detect the revolving speed of the revolving shaft or the output shaft, and transmit detected data with regard to the revolving speed.

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 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: An external rotor motor, including: a front end cover; a rear end cover; a sleeve casing; a rotary shaft; a stator assembly; and an external rotor assembly. The front end cover includes a first bearing chamber in which a front bearing is disposed. The front end cover and the rear end cover are disposed at two ends of the sleeve casing, respectively. The external rotor assembly is disposed on and integrated with the rotary shaft. The rear end cover includes a cover body and a sleeve base. The sleeve base includes a second bearing chamber in which a rear bearing is disposed. The external rotor assembly is disposed in the sleeve casing and sleeves the stator assembly. The rotary shaft includes a head, a middle part, and a tail. The tail of the rotary shaft is supported by the rear bearing on the rear end cover.

Abstract: A wiring terminal and a motor including the wiring terminal are provided. The wiring terminal includes: a mounting subassembly adapted to embed in a slot of an end insulator of a motor, a connection subassembly configured to support a wire stock having a lead wire, and a winding subassembly configure to receive an enameled wire wound on the winding subassembly. The connection subassembly and the winding subassembly are disposed on the top surface of the mounting subassembly. The lead wire of the wire stock is electrically connected to the enameled wire wound on the winding subassembly.

Abstract: A punching sheet used for manufacturing a rotor, including an axle hole, an outer edge, and a plurality of mounting grooves for receiving permanent magnets. The axle hole is disposed at the center of the punching sheet, and the plurality of mounting grooves are disposed in the proximity of the outer edge of the punching sheet. The outer edge of the punching sheet includes a plurality of arcs which have equal length and are connected to one another, and a center of a circle corresponding to each arc deviates from the center of the axle hole.

Abstract: A motor, including: a rotational shaft, a rotor, a stator, a housing, a first end cover, and a second end cover. The first end cover includes: a cover body including a bottom surface and a top surface, a bearing cavity, and a plurality of first bosses. The rotor is mounted on the rotational shaft; the stator is nested and installed inside the housing. The rotor is nested inside the stator; the first end cover and the second end cover are disposed on a rear end and a front end of the housing, respectively. The bearing cavity is disposed in the middle of the bottom surface of the cover body. The first bosses are circumferentially disposed at intervals on the top surface of the cover body. Outer side surfaces of the first bosses are located on a circle having a circle center coincident with the center of the cover body.

Abstract: A blower system, including a permanent magnet motor and a wind wheel. The permanent magnet motor includes a stator assembly, a rotor assembly, and a motor controller. The rotor assembly includes a salient pole rotor including a rotor core and magnets embedded in the rotor core. The motor controller includes a microprocessor, a frequency inverter, and a sensor unit. The sensor unit inputs a phase current or phase currents, a phase voltage, and a DC bus voltage into the microprocessor. The microprocessor outputs a signal to control the frequency inverter which is connected to a winding of the stator assembly. The ratio between an air gap of the motor and the thickness of the magnets ranges from 0.03 to 0.065, and the ratio between the length of a pole arc and the length of the magnets ranges from 0.8 to 1.0.