Motor and fan having motor

Patent metadata

Field	Value
Publication number	US-10230317-B2
Application number	US-201715611209-A
Country	US
Kind code	B2
Filing date	Jun 1, 2017
Priority date	Jun 1, 2016
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

A fan and a motor thereof are provided. The motor includes a motor drive device. The motor drive device includes a printed circuit board. A control management unit and a voltage converter are arranged on the printed circuit board, the control management unit classifies target rotation speed signals provided by an ECU into multiple rotation speed intervals, with each rotation speed interval corresponding to a fixed duty ratio. The control management unit receives a target rotation speed signal transmitted from the ECU in a real-time manner, and outputs a pulse width modulation signal having a duty ratio corresponding to the rotation speed interval to which the target rotation speed signal transmitted from the ECU belongs. The voltage converter is connected between the power source and the winding, and is configured to regulate a voltage outputted to the winding in response to the pulse width modulation signal having the fixed duty ratio outputted from the control management unit, to control a rotation speed of the motor. The motor drive device performs segment control on the rotation speed of the motor, thereby reducing the cost.

First claim

The invention claimed is:

1. A motor, comprising:
a stator,
a rotor rotatably mounted to the stator, and
a motor drive device, wherein
the rotor comprises a rotary shaft, an iron core fixed on the rotary shaft and a winding arranged on the iron core,
the motor drive device is connected between the winding and a power source,
the motor drive device comprises a printed circuit board,
a control management unit and a voltage converter are arranged on the printed circuit board,
the control management unit is configured to classify target rotation speed signals provided by an ECU into a plurality of rotation speed ranges, each corresponding to a specific output duty ratio, the control management unit is configured to receive a target rotation speed signal transmitted from the ECU in a real-time manner, and output a voltage regulating signal, which is a pulse width modulation signal having a duty ratio corresponding to the rotation speed range to which the target rotation speed signal transmitted from the ECU falls; and
the voltage converter is connected between the power source and the winding, and is configured to regulate a voltage outputted to the winding in response to the voltage regulating signal having the specific duty ratio outputted from the control management unit, to regulate a rotation speed of the motor.

2. The motor of claim 1 , wherein the control management unit is configured to classify the target rotation speed signals provided by the ECU into four rotation speed ranges, which are a stalling range, a low-speed range, a middle-speed range and a full-speed range.

3. The motor of claim 2 , wherein
the target rotation speed signal is in the stalling range in a case that a duty ratio of the target rotation speed signal is less than a ratio value X 1 , which is less than 10%,
the target rotation speed signal is in the low-speed range in a case that the duty ratio of the target rotation speed signal is greater than or equal to the ratio valve X 1 and less than a ratio value X 2 , which is greater than the ratio valve X 1 and less than or equal to 50%,
the target rotation speed signal is in the middle-speed range in a case that the duty ratio of the target rotation speed signal is greater than or equal to the ratio valve X 2 and less than a ratio value X 3 , which is greater than the ratio valve X 2 and less than or equal to 90%, and
the target rotation speed signal is in the full-speed range in a case that the duty ratio of the target rotation speed signal is greater than or equal to the ratio value X 3 and less than 100%.

4. The motor of claim 3 , wherein the ratio value X 1 is less than or equal to 5%.

5. The motor of claim 3 , wherein the ratio value X 2 is less than or equal to 40%.

6. The motor of claim 3 , wherein the ratio value X 3 is less than or equal to 80%.

7. The motor of claim 3 , wherein a duty ratio of the voltage regulating signal corresponding to the stalling range is equal to 0, a duty ratio of the voltage regulating signal corresponding to the low-speed range is equal to a ratio value Y 1 , which is greater than or equal to 20% and is less than or equal to 50%, a duty ratio of the voltage regulating signal corresponding to the middle-speed range is equal to a ratio value Y 2 , which is greater than or equal to 50% and less than or equal to 80%, and a duty ratio of the voltage regulating signal corresponding to the full-speed range is equal to 100%.

8. The motor of claim 1 , wherein the control management unit is configured to classify the target rotation speed signals provided by the ECU into three rotation speed ranges, which are a stalling range, a low-speed range and a full-speed range, and a duty ratio of the voltage regulating signal corresponding to the low-speed range ranges from 20% to 80%.

9. The motor of claim 1 , wherein the control management unit comprises:
a command manager configured to determine the rotation speed range to which the target rotation speed signal transmitted from the ECU falls, and output a target voltage in an analog form based on the duty ratio corresponding to the rotation speed range; and
a PWM generator, in which a triangular wave oscillator for generating a triangular wave is arranged, wherein the target voltage is compared with the triangular wave to output the pulse width modulation signal.

10. The motor of claim 1 , wherein the voltage converter comprises a diode and an MOS transistor connected between a positive electrode of the power source and ground in series, a cathode of the diode is connected to the positive electrode of the power source, an anode of the diode is connected to a drain of the MOS transistor, and a source of the MOS transistor is grounded, a gate of the MOS transistor receives the voltage regulating signal outputted from the control management unit, and the anode and the cathode of the diode are configured to be connected to the motor.

11. The motor of claim 1 , wherein
the stator comprises a cylindrical case, a plurality of permanent magnets arranged at an inner wall of the cylindrical case, and an endcap,
an opening is formed at one end of the cylindrical case in an axial direction, and the endcap is fixed at the opening of the cylindrical case in the axial direction,
the motor further comprises a brush assembly arranged on the endcap, the brush assembly comprises a brush holder and two brushes arranged on the brush holder,
a commutator electrically connected with the winding is arranged on the rotor, the brush is in sliding contact with the commutator, and
the printed circuit board of the motor drive device is arranged on the brush holder.

12. The motor of claim 11 , wherein
the brush holder is in an annular shape with a through hole at the center,
the commutator on the rotor passes through the through hole at the center of the brush holder,
the two brushes are arranged on the brush holder at an interval in a circumferential direction, and
a mounting groove is arranged on the brush holder, and the printed circuit board of the motor drive device is accommodated in the mounting groove.

13. The motor of claim 12 , wherein an arc-shaped hole for dissipating heat is arranged on a bottom wall of the mounting groove, and a heat dissipation hole in communication with the arc-shaped hole is arranged at a position of the endcap corresponding to the arc-shaped hole.

14. The motor of claim 13 , wherein the motor drive device further comprises a filtering unit connected with the voltage converter arranged on the printed circuit board, the filtering unit comprises an inductor, a first capacitor and a second capacitor, the inductor is connected between the power source and the voltage converter, one end of the inductor connected with the power source is grounded via the first capacitor, one end of the inductor connected to the voltage converter is grounded via the second capacitor, and the inductor, the first capacitor and the second capacitor are located at a position of the printed circuit board directly facing the arc-shaped hole.

15. The motor of claim 14 , wherein the motor further comprises a radiator, and the radiator is mounted outside the endcap of the motor and is attached to an outer surface of the endcap of the motor closely.

16. The motor of claim 15 , wherein the radiator comprises a substrate in an annular-sector shape and a side wall perpendicularly extending from an outer edge of the substrate, a projection portion is arranged at a position of the substrate corresponding to the heat dissipation hole and the arc-shaped hole, the projection portion extends into the heat dissipa

Assignees

• Johnson Electric Int Ag

Inventors

• Qin Rui Feng
• Guan Xin Hui
• Tse Kwok Kuen
• Qu Tao
• Wan Zhong
• Xu kai qi
• Xu Bao Yi

Classifications

• H02P7/2805

  whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value · CPC title

• H02M5/458

  using semiconductor devices only · CPC title

• H02P7/2913 Primary

  whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value · CPC title

• H02P7/29

  using pulse modulation · CPC title

• H02J3/34

  Arrangements for transfer of electric power between networks of substantially different frequency · CPC title