Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
  • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
  • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors

Definitions

• the present invention relates to a brushless DC motor, and more particularly to an improvement in the structure of a Hall element of a brushless DC motor. Background technique
• the brushless DC motor has superior speed regulation performance, mainly in the convenience of speed regulation, wide speed regulation range, good low speed performance, stable operation, low noise, high power factor, and no rotor loss, so the efficiency is very high. It is extremely extensive in civilian use. In particular, miniature brushless DC motors are used more widely. In order to improve the performance of the motor, people have conducted long-term exploration and proposed various design schemes. However, due to the limitation of internal space, the micro-motor has a relatively compact structure and is particularly difficult to design the layout of the motor. The controller of the traditional motor is generally external, so that the whole system is divided into two parts, the motor part and the control part, and the degree of integration is poor.
• the conventional Hall elements are generally mounted on the stator of the motor, and the lead wires of the Hall components are connected to the circuit board, so that a plurality of wires are drawn regardless of whether the motor is located outside the motor or inside the motor.
• the operation difficulty in assembly is increased, resulting in low production efficiency.
• the Hall element of this structure is still mounted on the stator, which does not fundamentally solve the process problem and has poor heat dissipation performance.
• the motor body has more connections on the controller, and the operation is more difficult. Not only is the work efficiency low, but the performance is not stable.
• the invention mainly solves the technical problems of the prior art that the structure is complicated, the circuit is disordered, the assembly is difficult, and the production efficiency is low.
• the invention solves the technical problems of the prior art that the debugging is difficult, the degree of integration is not high, and the layout is not reasonable.
• the invention also solves the technical problems of the prior art that the heat dissipation performance is not high, the circuit board is easy to burn out, and the system stability is not high.
• a brushless DC motor external to a Hall element comprising a motor housing, a stator and a rotor disposed in the housing, characterized in that a circuit board is disposed at a rear end of the housing, the circuit board is matched with the control chip on the rear end cover, and a Hall element is disposed on the circuit board; and a Hall element is disposed at a rotor shaft end of the rotor Induction of magnetic steel.
• the present invention modifies the deficiencies of the prior art by creatively removing the Hall sensor from the stator chamber and placing it within the board cavity.
• the Hall sensor is placed directly on the board, without complicated leads, and it is easy to assemble only three winding wires between the circuit board and the stator.
• the Hall sensor moves out of the stator chamber, it is far from the rotor magnet in the stator and cannot sense the rotation of the rotor.
• the rotor shaft is extended to the circuit board chamber adjacent to the stator chamber, and then A small circular magnetic steel is mounted on the shaft of the root extension, and the magnetic steel rotates synchronously with the rotor.
• the small magnetic steel can induce the position signal of the rotor on the Hall sensor, thereby controlling the stator current commutation of the circuit board, and driving the motor to rotate. .
• said housing is divided by a partition into a stator chamber and a circuit board chamber, said rotor shaft passing through the partition into the circuit board chamber.
• the rotor shaft is coupled to a mating hole provided on the partition plate through a bearing
• the bearings are oil-impregnated bearings. Oil-impregnated bearings can effectively reduce energy loss during transmission and improve transmission efficiency.
• the partition plate is provided with a through hole, and the lead wire of the circuit board is connected to the stator winding provided in the stator chamber through the through hole.
• the circuit board and the control chip are mated with the rear end cover by a mating member; the control chip abuts against the rear end cover.
• the contact between the control chip and the back end cover facilitates the heat dissipation of the chip, avoiding the burnout caused by the overheating of the circuit board, thereby causing the entire system to be paralyzed, and effectively improving the stability of the system.
• the cavity wall of the circuit board chamber is provided with a gasket, and the rear end cover abuts against the gasket.
• the magnetic steel is a cylindrical magnetic steel, and an axial line of the rotor shaft is located on a same line as an axial line of the magnetic steel. Since the general cylindrical magnetic induction can not see the boundary between the N pole and the S and the U, the small magnetic sense placed in the circuit board chamber can be installed without regard to the stator magnet in the magnetic steel and the stator chamber.
• the pole type of the steel is one-to-one. As long as the circuit board fixed to the rear end cover is adjusted, the rear end cover with the circuit board can be rotated along the outer casing of the motor. By observing the ammeter, when the current of the ammeter is the smallest, the motor is the highest. Just adjust to the desired position.
• the spacer matching hole is provided with a retaining ring.
• the invention has the following advantages: 1.
• the design is reasonable, the structure is simple, and the effect is remarkable; 2.
• the Hall element is externally placed in an original manner, overcomes the defects of the layout on the original scheme, effectively simplifies the structure, and is easy to assemble; 3.
• the heat dissipation performance is significantly improved, which improves the stability of the system work; 4.
• the debugging process is convenient and easy to operate.
• Figure 1 is a schematic partial cross-sectional view of the present invention. Best way to implement the invention
• a brushless DC motor external to a Hall element includes a motor housing 1, a stator and a rotor disposed in the housing 1.
• the housing 1 is divided by a partition 7 into a stator chamber 8 and a circuit board chamber 9, and the rotor shaft 5 passes through the partition 7 into the circuit board chamber 9.
• a circuit board 2 is disposed at a rear end portion of the casing 1, and the circuit board 2 and the control chip 3 are coupled to the rear end cover 15 through the mating member 14, and the control chip 3 abuts against the rear end cover 15; 2 is provided with a Hall element 4.
• the rotor shaft 5 of the rotor is provided with a magnetic steel 6 that is inductive to the Hall element 4.
• the rotor shaft 5 is coupled to a mating hole 11 provided in the partition plate through a bearing 10, and the bearing 10 is an oil-impregnated bearing.
• a through hole 12 is formed in the partition 7, and the three leads 13 of the circuit board 2 are connected to the stator windings provided in the stator chamber 8 through the through holes 12.
• a gasket 16 is provided on the wall of the circuit board chamber 9, and the rear end cover 15 abuts against the gasket 16.
• the magnetic steel 6 is a cylindrical magnetic steel, and the axial line of the rotor shaft 5 is located on the same line as the axial line of the magnetic steel 6; a retaining ring 17 is provided on the mating hole 11 of the partition.
• the magnet 6 provided at the end of the rotor shaft 5 rotates to sense the Hall element provided on the circuit board, thereby driving the motor to rotate.
• the rear end cover with the circuit board can be rotated along the outer casing of the motor by adjusting the circuit board fixed to the rear end cover. By observing the ammeter, when the ammeter current is minimum, the motor is adjusted to the required position when it is at the highest. .

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Brushless Motors (AREA)

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Citations (4)

• 2004
  • 2004-06-29 CN CN 200410025795 patent/CN1716736A/zh active Pending
  • 2004-08-20 WO PCT/CN2004/000972 patent/WO2006000131A1/zh active Application Filing
  • 2004-08-20 RU RU2006130295/22U patent/RU62750U1/ru not_active IP Right Cessation

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