Abstract: A motor controller includes a tap position selection circuit, a micro control unit (MCU), and an inverter circuit. The tap position selection circuit is configured to process a plurality of tap position signals transmit processed tap position signals to the MCU. The MCU is configured to output signals to control the operation of the inverter circuit. The inverter circuit includes an output terminal connected to a plurality of coil windings of a stator module of a motor. The tap position selection circuit includes a plurality of first signal input circuits for motor start and a plurality of second signal input circuits for motor stop; each tap position signal is split into a first part and a second part. The first part is input into one first signal input circuit for motor start and the second part is input into one second signal input circuit for motor stop.

Abstract: A method for controlling operation of a permanent-magnet synchronous motor includes: during operation of the permanent-magnet synchronous motor, receiving, by the permanent-magnet synchronous motor, a shutdown signal from an external device; uninterruptedly outputting, by a microcontroller unit (MCU), a deceleration pulse to an inverter, instead of directly blocking a PWM pulse to the inverter, and constantly monitoring a control signal sent by the external device; during a deceleration process, when the MCU receives a new startup signal and a real-time speed Vi of the permanent-magnet synchronous motor is greater than or equal to a reference speed Vref, controlling the permanent-magnet synchronous motor to rotate at a parameter approaching to a target torque T or a target speed V corresponding to the new startup signal; and blocking, by the MCU, the PWM pulse when the real-time speed Vi of the permanent-magnet synchronous motor is lower than the reference speed Vref.

Abstract: A combined motor controller, including: a first function module, including at least one power module powered by the mains supply to output a VDC power supply to power other modules; a second function module, including at least one motor control module including a microprocessor control unit (MCU) and an IGBT inverter; and a third function module, including at least one I/O module configured to transmit signals between a system main control board or a peripheral device and the motor control module. Each function module is provided with an independent metal or plastic shell and a first circuit board located in the shell, and the first function module, the second function module and the third function module are connected by mutually matched connectors for power supply or control signal transmission between the function modules.

Abstract: A method for constant torque control of an EC motor of a ventilation system includes: defining a maximum speed spd_max_ref and a minimum speed spd_min_ref of an electronically commutated motor (ECM) within a constant-torque operation range; by using a proportional integral (PI) controller, calculating an upper reference torque T_ref_up with the maximum speed spd_max_ref as a first reference speed, and calculating a lower reference torque T_ref_low with the minimum speed spd_min_ref as a second reference speed; and T_ref_up>T_ref_low; receiving an externally input torque command Tcom; comparing the torque command Tcom, the upper reference torque T_ref_up, and the lower reference torque T_ref_low to determine a target torque Tact; and controlling the ECM to operate in a constant torque mode under the target torque Tact.

Abstract: An ECM including a motor body and a motor controller. The motor body includes a stator assembly. The stator assembly includes a stator winding. The motor controller includes a control circuit board, and the control circuit board includes a power source, a microprocessor, an insulated-gate bipolar transistor (IGBT) inverter circuit, and a plurality of universal interface modules. The motor controller is configured to be connected to a main control board of a heating, ventilation, and air conditioning (HVAC) system, to receive a command from the HVAC system, and to control the operation of the motor body based on the command. The power source is configured to supply power to each electric circuit of the motor controller. The IGBT inverter circuit includes an output terminal; the stator winding includes a coil winding; and the output terminal is connected to the coil winding.

Abstract: A combined motor controller, including: a first function module, including at least one power module powered by the mains supply to output a VDC power supply to power other modules; a second function module, including at least one motor control module including a microprocessor control unit (MCU) and an IGBT inverter; and a third function module, including at least one I/O module configured to transmit signals between a system main control board or a peripheral device and the motor control module. Each function module is provided with an independent metal or plastic shell and a first circuit board located in the shell, and the first function module, the second function module and the third function module are connected by mutually matched connectors for power supply or control signal transmission between the function modules.

Abstract: A method for controlling the start-up phase of a sensorless permanent magnet synchronous motor, the method including: 1) according to the formula T=K×Iq where T is a torque, K is a coefficient, and Iq is a current on a q-axis of a coordinate system of a motor mathematical model, based on a maximum output torque Tmax of a motor, calculating a maximum current Iq_max on the q-axis, setting the maximum current Iq_max as an upper limit of current on the q-axis, and controlling the motor to run in an open-loop control mode; and 2) when an actual running speed V of the motor reaches a first target speed V_ref1, reducing the maximum current Iq_max to a target current Iq0 on the q-axis corresponding to a target torque T0 set by users, and controlling the motor to run in a closed-loop control mode under the first target speed V_ref1.

Abstract: An ECM including a motor body and a motor controller. The motor body includes a stator assembly. The stator assembly includes a stator winding. The motor controller includes a control circuit board, and the control circuit board includes a power source, a microprocessor, an insulated-gate bipolar transistor (IGBT) inverter circuit, and a plurality of universal interface modules. The motor controller is configured to be connected to a main control board of a heating, ventilation, and air conditioning (HVAC) system, to receive a command from the HVAC system, and to control the operation of the motor body based on the command. The power source is configured to supply power to each electric circuit of the motor controller. The IGBT inverter circuit includes an output terminal; the stator winding includes a coil winding; and the output terminal is connected to the coil winding.

Abstract: A signal converter, including: a power circuit, a microprocessor, a plurality of input signal interface circuits, a first multiplexer switch, and an output signal interface circuit. The power circuit supplies power for each circuit of the signal converter. The plurality of input signal interface circuits is disposed side by side, and in operation, one of the plurality of input signal interface circuits is connected to the first multiplexer switch to work. The plurality of input signal interface circuits includes input terminals and output terminals. The input terminals receive corresponding input signals, and the output terminals are connected to the microprocessor. The microprocessor includes an output terminal which is connected to the output signal interface circuit. The microprocessor controls the first multiplexer switch to connect to one of the plurality of input signal interface circuits.

Abstract: A motor assembly including a motor and a control circuit board. The motor includes a housing, a stator assembly, a rotating shaft, and a rotor assembly. The control circuit board includes a first electric wire, a second electric wire, a detection wire, a ground wire, a power supply circuit, a control circuit, and a detection circuit. The first electric wire and the second electric wire are connected to the commercial AC electric supply, and the detection wire detects whether or not a load connected to the motor is electrified. The first electric wire and the second electric wire are connected to the input terminals of the power supply circuit. The detection circuit is disposed between the detection wire and the ground wire. The detection circuit transmits a detection signal to the control circuit, and the control circuit controls the motor to rotate at various rotation speeds.

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 for controlling the start-up phase of a sensorless permanent magnet synchronous motor, the method including: 1) according to the formula T=K×Iq where T is a torque, K is a coefficient, and Iq is a current on a q-axis of a coordinate system of a motor mathematical model, based on a maximum output torque Tmax of a motor, calculating a maximum current Iq_max on the q-axis, setting the maximum current Iq_max as an upper limit of current on the q-axis, and controlling the motor to run in an open-loop control mode; and 2) when an actual running speed V of the motor reaches a first target speed V_ref1, reducing the maximum current Iq_max to a target current Iq0 on the q-axis corresponding to a target torque T0 set by users, and controlling the motor to run in a closed-loop control mode under the first target speed V_ref1.

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 motor assembly including a motor and a control circuit board. The motor includes a housing, a stator assembly, a rotating shaft, and a rotor assembly. The control circuit board includes a first electric wire, a second electric wire, a detection wire, a ground wire, a power supply circuit, a control circuit, and a detection circuit. The first electric wire and the second electric wire are connected to the commercial AC electric supply, and the detection wire detects whether or not a load connected to the motor is electrified. The first electric wire and the second electric wire are connected to the input terminals of the power supply circuit. The detection circuit is disposed between the detection wire and the ground wire. The detection circuit transmits a detection signal to the control circuit, and the control circuit controls the motor to rotate at various rotation speeds.

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 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: A signal converter, including: a power circuit, a microprocessor, a plurality of input signal interface circuits, a first multiplexer switch, and an output signal interface circuit. The power circuit supplies power for each circuit of the signal converter. The plurality of input signal interface circuits is disposed side by side, and in operation, one of the plurality of input signal interface circuits is connected to the first multiplexer switch to work. The plurality of input signal interface circuits includes input terminals and output terminals. The input terminals receive corresponding input signals, and the output terminals are connected to the microprocessor. The microprocessor includes an output terminal which is connected to the output signal interface circuit. The microprocessor controls the first multiplexer switch to connect to one of the plurality of input signal interface circuits.

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 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.