SPEED CONTROL SYSTEM FOR A CEILING FAN MOTOR

Abstract

The invention teaches a speed control system for a brushless DC motor for a ceiling fan, comprising a power circuit 1, a microprocessor circuit 2, a power drive circuit 3, a speed regulation circuit, and a brushless DC permanent magnetic motor 5, wherein the input terminal of the power circuit 1 is connected to the output terminal 101 of an AC power source, the output terminal of the power circuit 1 serves to power the various circuits, the output terminal of the microprocessor circuit 2 is connected to the input terminal of the power drive circuit 3, the output terminal of the power drive circuit 3 is connected to the coil windings 501 of the brushless DC permanent magnetic motor, and the output terminal of the speed regulation circuit is connected to the input terminal of the microprocessor circuit 2. The speed control system of the invention provides the advantages of low energy consumption, low noise during the operation of the motor, and a stable operation at low speeds.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The objects and advantages of the invention will become more readily apparent after reading the ensuing descriptions of the non-limiting illustrative embodiment and viewing the accompanying drawings, in which

FIG. 1 is a block diagram of a speed control system for a brushless DC motor for a ceiling fan in accordance with one embodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

As shown in FIG. 1, the speed control system for a brushless DC motor for a ceiling fan comprises a power circuit 1, a microprocessor circuit 2, a power drive circuit 3, a speed regulation circuit 4, 7, and a brushless DC permanent magnetic motor 5. The input terminal of the power circuit 1 is connected to the output terminal 101 of an AC power source. The output terminal of the power circuit 1 serves to power the various circuits. The output terminal of the microprocessor circuit 2 is connected to the input terminal of the power drive circuit 3. The output terminal of the power drive circuit 3 is connected to the coil windings 501 of the brushless DC permanent magnetic motor. The output terminal of the speed regulation circuit is connected to the input terminal of the microprocessor circuit 2.

The speed regulation circuit is a wireless speed regulation circuit 4, or a wired speed regulation circuit 7, or comprises the wireless speed regulation circuit 4 and the wired speed regulation circuit 7 simultaneously.

The wireless speed regulation circuit 4 comprises a wireless receiver module 401, a wireless signal processing circuit 402, and a wireless transmission module 403. The wireless transmission module 403 is wirelessly-connected with the wireless receiver module 401. The output terminal of the wireless receiver module 401 is connected to the input terminal of the wireless signal processing circuit 402. The output terminal of the wireless signal processing circuit 402 is connected to the input terminal of the microprocessor circuit 2. The wireless transmission module 403 comprises at least two control buttons serving to power on and off the ceiling fan, or controlling the speed of the ceiling fan etc.

The wired speed regulation circuit 7 comprises a manual control box 701 and an optoelectronic isolating circuit 702. The manual control box 701 is connected to the microprocessor circuit 2 via the optoelectronic isolating circuit. The manual control box 701 comprises at least two control buttons serving to power on and off the ceiling fan, or controlling the speed of the ceiling fan, respectively.

The input terminal of the microprocessor circuit 2 is further connected with a rotor position detection circuit 6. The rotor position detection circuit 6 obtains the rotor position signal from the position sensor 502 installed on the brushless DC motor, or from the position between the output terminal of the power drive circuit 3 and the coil windings 501 of the brushless DC motor.

The power circuit 1 comprises a filtering circuit 102, a rectifying circuit 103, and a voltage converting circuit 104.

While particular embodiments of the invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from the invention in its broader aspects, and therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention.

Claims

1. A speed control system for a brushless permanent magnet DC motor for a ceiling fan comprising a power circuit 1 having an input terminal and an output terminal;a microprocessor circuit 2 having an input terminal and an output terminal;a power drive circuit 3 having an input terminal and an output terminal;a speed regulation circuit 4, 7 having an output terminal; anda brushless DC permanent magnetic motor 5;

2. The speed control system of claim 1, wherein said speed regulation circuit is a wireless speed regulation circuit 4; a wired speed regulation circuit 7; or comprises a wireless speed regulation circuit 4 and a wired speed regulation circuit 7 simultaneously.

3. The speed control system of claim 2, wherein said wireless speed regulation circuit 4 comprises a wireless receiver module 401 having an output terminal, a wireless signal processing circuit 402 having an input terminal and an output terminal, and a wireless transmission module 403;said wireless transmission module 403 is wirelessly connected to said wireless receiver module 401;said output terminal of said wireless receiver module 401 is connected to said input terminal of said wireless signal processing circuit 402, andsaid output terminal of said wireless signal processing circuit 402 is connected to said input terminal of the microprocessor circuit 2.

4. The speed control system of claim 3, wherein said wireless transmission module 403 comprises at least two control buttons for controlling the speed of the ceiling fan, or serving to power on and off the ceiling fan etc.

5. The speed control system of claim 2, wherein said wire speed regulation circuit 7 comprises a manual control box 701 and an optoelectronic isolating circuit 702 having an output terminal and an input terminal and said output terminal of the manual control box 701 is connected to the input terminal of the optoelectronic isolating circuit 702, the output terminal of optoelectronic isolating circuit 702 is connected to the input terminal of the microprocessor circuit 2.

6. The speed control system of claim 5, wherein said manual control box 701 comprises at least two control buttons serving to power on and off the ceiling fan, or controlling the speed of the ceiling fan etc.