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Zhongshan Broad Ocean Motor : Patent Issued for DC Permanent Magnet Synchronous Motor (USPTO 9571015)

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02/24/2017 | 07:17am CET

By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Zhao, Yong (Zhongshan, CN); Bian, Wenqing (Zhongshan, CN); Lu, Chuping (Zhongshan, CN), filed on July 15, 2014, was published online on February 14, 2017.

The assignee for this patent, patent number 9571015, is ZHONGSHAN BROAD-OCEAN MOTOR CO., LTD. (Zhongshan, CN).

Reporters obtained the following quote from the background information supplied by the inventors: "Field of the Invention

"The invention relates to a DC permanent magnet synchronous motor and a combination of the motor and a heating, ventilation, air-conditioning and cooling (HVAC) control system.

"Description of the Related Art

"A typical integrated permanent magnet synchronous motor includes a motor body and a motor controller which are connected together. The motor body includes a stator assembly, a rotor assembly, and a housing assembly. The stator assembly is mounted on the housing assembly. The rotor assembly is nested within or outside the stator assembly. The motor controller includes: a power supply unit, a detection unit for motor operating parameters, a microprocessor, an inverter unit, and an interface circuit. An output end of the power supply unit supplies power to each circuit part of the motor controller. The detection unit for the operating parameters of the motor detects the motor operating data and sends such signal to the microprocessor. The microprocessor controls the inverter circuit to drive the energization or deenergization of a coil winding arranged on the stator assembly.

"However, the above integrated permanent magnet synchronous motor have the following problems to be solved:

"1) As the integrated permanent magnet synchronous motor is controlled by the control system of an upper level, herein take an HVAC control system as an example, the HVAC control system can be applied in a plurality of control applications, such as, an EGF control function, a constant rotational speed control function, a constant torque control function, and a constant air volume control function, which are all applications of upper level. Once the motor is manufactured, the control program (a control function) has been written into the microprocessor. When the application environment is required to change, the motor cannot be applied, thereby resulting in lots of waste, inflexible replace, and being not conducive for a secondary development.

"2) The application control of the controller is relatively complicated, thereby bringing about troubles in product detection."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "In view of the above-described problems, it is one objective of the invention to provide a DC permanent synchronous motor that comprises an application control part being independent from the motor and integrated on an external control card and that further comprises a basic drive control part disposed on the motor controller. It is only required to displace the external control card with different application control functions to adapt to different application environment, so that the DC permanent synchronous motor has a strong adaptability, reduces the waste caused by change of the environment or the function, and is conducive to the secondary development. The motor body and the motor controller only achieve the drive control function of the basic open loop. The detection and the maintenance of the motor are simple, and the quality thereof is easily ensured.

"To achieve the above objective, in accordance with one embodiment of the invention, there is provided a DC permanent magnet synchronous motor. The DC permanent magnet synchronous motor comprises: a motor body, the motor body comprising a rotating shaft, a permanent rotor assembly, a stator assembly, and a housing assembly; a motor controller, the motor controller comprising 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, the external control card comprising a second microprocessor for application control. The stator assembly comprises a stator core and a coil winding winded on the stator core. The inverter circuit comprises an output end. The permanent rotor assembly and the stator assembly are magnetically coupled and are installed on the housing assembly. The operating parameters of the motor are input into the first microprocessor by the detection circuit. The first microprocessor outputs a PWM (Pulse-Width Modulation) signal to control the inverter circuit. The output end of the inverter circuit is connected to the 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.

"In a class of this embodiment, the detection circuit comprises a rotor position measuring circuit. The rotor position measuring circuit inputs rotor position data into the first microprocessor and determines an occasion for current commutation, and the first microprocessor drives the inverter circuit whereby forming an open loop control mode.

"In a class of this embodiment, the detection circuit comprises a phase current measuring circuit. The phase current measuring circuit inputs current data into the first microprocessor, and the first microprocessor drives the inverter circuit whereby forming an open loop control mode.

"In a class of this embodiment, the second microprocessor and the first microprocessor are interconnected for communication via an R/T serial communication module. The first microprocessor sends operating data of the motor to the second microprocessor, the second microprocessor sends a control command to the first microprocessor according to the operating data of the motor, and the first microprocessor executes the control command and controls the inverter circuit to operate whereby forming a close loop control.

"In a class of this embodiment, a constant air volume control module, a constant rotational speed control module, or a constant torque control module is stored in the second microprocessor.

"In a class of this embodiment, the external control card communicates with the motor controller through four interface lines comprising a ground line, a +5 V power line, an RX communication line, and a TX communication line.

"In a class of this embodiment, the external control card communicates with the motor controller through three interface lines comprising a ground line, a +5 V power line, and an R/T communication line.

"In a class of this embodiment, the motor controller further comprises a power supply circuit. The power supply circuit supplies power to each circuit part. The power supply circuit, the first microprocessor, and the inverter circuit are integrated on a control circuit board. The control circuit board is disposed inside a control box, and the control box is disposed at a bottom of the housing assembly. The external control card is disposed outside the control box. An input end of the power supply circuit is connected to an external AC input. Output ends of the power supply circuit comprise: a first output end for a bus voltage, a second output end for a +5 V voltage, and a third output end for a +15 V voltage. The bus voltage and the +15 V voltage are supplied to the inverter circuit, and the +5 V voltage are supplied to external devices.

"In a class of this embodiment, the detection circuit further comprises a bus current measuring circuit and a bus voltage measuring circuit.

"In a class of this embodiment, the housing assembly comprises: a cylinder housing, a front end cover, and a rear end cover. The permanent rotor assembly is disposed on the rotating shaft. The stator assembly and the cylinder housing are connected together and are nested outside the permanent rotor assembly. The front end cover and the rear end cover are disposed on two ends of the cylinder housing, respectively. The rotating shaft is disposed on bearings of the front end cover and the rear end cover.

"In a class of this embodiment, the motor controller is disposed outside the housing assembly, the control circuit board of the motor controller is disposed inside a casing, and the casing is connected to the rear end cover.

"In accordance with another embodiment of the invention, there is provided a combination of an HVAC control system and the DC permanent magnet synchronous motor. The HVAC control system is directly connected to the DC permanent magnet synchronous motor via a connection socket.

"In accordance with still another embodiment of the invention, there is provided a combination of an HVAC control system and the DC permanent magnet synchronous motor. The HVAC control system is directly connected to the DC permanent magnet synchronous motor via a connection socket, and the external control card is mounted on the HVAC control system.

"Advantages according to embodiments of the invention are summarized as follows:

"1) The DC permanent magnet synchronous motor comprises the motor body and the motor controller. The motor body comprises: the rotating shaft, the permanent rotor assembly, the stator assembly, and the housing assembly. The permanent rotor assembly and the stator assembly are magnetically coupled and are installed on the housing assembly. The stator assembly comprises the stator core and the coil winding winded on the stator core. The motor controller comprises the first microprocessor, the inverter circuit, and the detection circuit. The operating parameters of the motor are input into the first microprocessor by the detection circuit. The PWM signal is output by the first microprocessor to control the inverter circuit. The output end of the inverter circuit is connected to the coil winding. The external control card is disposed outside the motor body and is connected to the motor body via the electric wire. The external control card comprises a second microprocessor for application control. The second microprocessor and the first microprocessor are interconnected so that they can communicate. Thus, the application control is independent from the motor, and all the application control part is centralized inside the external control card. The basic drive control part is disposed on the motor controller. It is only required to displace the external control card with different application control functions to adapt to different application environment, so that the DC permanent synchronous motor has a strong adaptability, reduces the waste caused by change of the environment or the function, and is conducive to the secondary development. The motor body and the motor controller only achieve the drive control function of the basic open loop. The detection and the maintenance of the motor are simple, and the quality thereof is easily ensured.

"2) The external control card communicates with the motor controller through four interface lines comprising the ground line, the +5 V power line, the RX communication line, and the TX communication line. The interface is simple, the production cost is low, and the communication is stable.

"3) The external control card and the motor controller employ three interface lines comprising the ground line, the +5 V power line, and the R/T communication line. Thus, the interface is further simplified, the production cost is much lower, and the communication is much reliable, even the communication between a connecting distance of a dozen meters is relatively reliable.

"4) The first HVAC control system for the above DC permanent magnet synchronous motor is provided. The first HVAC control system is directly connected to the DC permanent magnet synchronous motor via the connection socket. It is only required to displace the external control card with different application control functions to adapt to different application environment, so that the DC permanent synchronous motor has a strong adaptability, reduces the waste caused by change of the environment or the function, and is conducive to the secondary development.

"5) The second HVAC control system for the above DC permanent magnet synchronous motor is provided. The external control card is mounted on the second HVAC control system. Thus, the structure is simplified, and the production cost is saved."

For more information, see this patent: Zhao, Yong; Bian, Wenqing; Lu, Chuping. DC Permanent Magnet Synchronous Motor. U.S. Patent Number 9571015, filed July 15, 2014, and published online on February 14, 2017. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9571015.PN.&OS=PN/9571015RS=PN/9571015

Keywords for this news article include: Electronics, Circuit Board, Microprocessors, ZHONGSHAN BROAD-OCEAN MOTOR CO. LTD.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2017, NewsRx LLC

(c) 2017 NewsRx LLC, source Technology Newsletters

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