CN110798106A

CN110798106A - Driving method of electromagnetic motor

Info

Publication number: CN110798106A
Application number: CN201810870355.4A
Authority: CN
Inventors: 赵立新; 李怀兆
Original assignee: Galaxycore Shanghai Ltd Corp
Current assignee: Galaxycore Shanghai Ltd Corp
Priority date: 2018-08-02
Filing date: 2018-08-02
Publication date: 2020-02-14
Anticipated expiration: 2038-08-02
Also published as: CN110798106B

Abstract

The invention provides a driving method of an electromagnetic motor, the electromagnetic motor comprises a magnetic component, a coil and a driving circuit; the current provided by the driving circuit for the coil comprises pulse current, each pulse current drives the rotor of the electromagnetic motor to move by one step, and the rotor is a magnetic component or a coil; the pulse initial current on the control coil of the drive circuit is more than 20% of the average value of the pulse current, so that the capability of overcoming static friction force when the rotor moves in a single step is improved, the time required by motion starting is shortened, the motion efficiency of the electromagnetic motor is improved, and the performance of an electronic product is improved.

Description

Driving method of electromagnetic motor

Technical Field

The present invention relates to a driving method of an electromagnetic motor.

Background

At present, an electromagnetic motor is widely used in various electronic products, for example, in a camera module of a portable electronic device, the electromagnetic motor is used to realize automatic focusing of a lens unit.

An electromagnetic motor generally includes a magnetic component, a coil, and a drive circuit. As shown in fig. 1, in the stepping motor, the current supplied to the coil by the driving circuit comprises pulse currents 10, and each pulse current 10 drives the mover of the electromagnetic motor to move by one step, wherein the mover may be a magnetic component or a coil. The static friction force needs to be overcome when the rotor moves, so that the movement starting time is long, the movement efficiency of the electromagnetic motor is influenced, and the performance of an electronic product, such as the focusing efficiency of a camera module, is further influenced.

Disclosure of Invention

The invention aims to provide a driving method of an electromagnetic motor, which can improve the motion efficiency of the electromagnetic motor and improve the performance of electronic products.

In order to solve the above technical problem, the present invention provides a driving method of an electromagnetic motor including a magnetic member, a coil, and a driving circuit; the current provided by the driving circuit for the coil comprises pulse current, each pulse current drives the rotor of the electromagnetic motor to move by one step, and the rotor is a magnetic component or a coil; the pulse initial current on the control coil of the drive circuit is more than 20% of the average value of the pulse current, so that the capability of overcoming the static friction force during single-step movement of the rotor is improved.

Preferably, the driving circuit generates an internal high voltage, which is greater than an external input voltage by 20% or more, and generates a pulse start current from the internal high voltage.

Preferably, after the mover starts to move by overcoming the static friction force, the driving circuit generates a pulse driving current by using the external input voltage.

Preferably, the driving circuit generates the internal high voltage by using a charge pump method and stores the internal high voltage on a capacitor.

Preferably, the mover is in a stationary state, and the current supplied to the coil by the driving circuit before the pulse current is input may be a positive current, a negative current or a zero current.

Preferably, the pulsed drive current comprises a plurality of segments of currents of different values.

According to the driving method of the electromagnetic motor, the pulse starting current on the coil is controlled by the driving circuit to be more than 20% of the average value of the pulse current, so that the capability of overcoming static friction force when the rotor moves in a single step is improved, the time required by motion starting is shortened, the motion efficiency of the electromagnetic motor is improved, and the performance of an electronic product is improved.

Drawings

FIG. 1 is a schematic diagram of the current supplied to the coil by the drive circuit in a prior art electromagnetic motor;

FIG. 2 is a schematic diagram of the current supplied to the coil by the drive circuit in an electromagnetic motor according to one embodiment of the present invention;

fig. 3 is a schematic diagram of the current supplied to the coil by the driving circuit in the electromagnetic motor according to another embodiment of the present invention.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather construed as limited to the embodiments set forth herein.

Next, the present invention is described in detail by using schematic diagrams, and when the embodiments of the present invention are described in detail, the schematic diagrams are only examples for convenience of description, and the scope of the present invention should not be limited herein.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Fig. 2 is a schematic diagram of the current supplied to the coil by the driving circuit in the electromagnetic motor according to one embodiment of the present invention. Referring to fig. 2, the present invention provides a driving method of an electromagnetic motor including a magnetic member, a coil, and a driving circuit; the current provided by the driving circuit to the coil comprises pulse currents 110, each pulse current 110 drives a rotor of the electromagnetic motor to move by one step, and the rotor is a magnetic component or a coil; the pulse starting current 111 on the control coil of the driving circuit is more than 20% of the average value of the pulse current 110, so that the capability of overcoming static friction force when the rotor moves in a single step is improved, the time required by motion starting is shortened, the motion efficiency of the electromagnetic motor is improved, and the performance of an electronic product is improved.

Preferably, the driving circuit generates an internal high voltage, for example, by using a charge pump method, and stores the internal high voltage on a capacitor, the internal high voltage is more than 20% larger than an external input voltage, and a pulse starting current 111 is generated by the internal high voltage so as to drive the mover to start moving. When the rotor starts to move by overcoming the static friction force, the driving circuit generates pulse driving current 112 by using the external input voltage, and drives the rotor to continue to move.

Preferably, the mover is in a static state, and the current 120 provided to the coil by the driving circuit before the pulse current 110 is input may be a positive current, a negative current or a zero current.

Fig. 3 is a schematic diagram of the current supplied to the coil by the driving circuit in the electromagnetic motor according to another embodiment of the present invention. Referring to fig. 3, the present invention provides a driving method of an electromagnetic motor including a magnetic member, a coil, and a driving circuit; the current provided by the driving circuit to the coil comprises pulse currents 210, each pulse current 210 drives a rotor of the electromagnetic motor to move by one step, and the rotor is a magnetic component or a coil; the pulse starting current 211 on the control coil of the driving circuit is more than 20% of the average value of the pulse current 210, so that the capability of overcoming static friction force when the rotor moves in a single step is improved, the time required by motion starting is shortened, the motion efficiency of the electromagnetic motor is improved, and the performance of an electronic product is improved.

Preferably, the driving circuit generates an internal high voltage, for example, by using a charge pump method, and stores the internal high voltage on a capacitor, the internal high voltage is more than 20% larger than an external input voltage, and a pulse starting current 211 is generated by the internal high voltage so as to drive the mover to start moving. When the mover starts to move against the static friction, the driving circuit generates a pulse driving current 212 using the external input voltage. Unlike the embodiment of fig. 2, the pulsed driving current 212 in this embodiment may comprise a plurality of different currents to meet different requirements of different phases of the subsequent movement of the mover.

Preferably, the mover is in a stationary state, and the current 220 provided to the coil by the driving circuit may be a positive current, a negative current, or a zero current before the pulse current 210 is input.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims

1. A method for driving an electromagnetic motor,

the electromagnetic motor comprises a magnetic component, a coil and a driving circuit;

the current provided by the driving circuit for the coil comprises pulse current, each pulse current drives the rotor of the electromagnetic motor to move by one step, and the rotor is a magnetic component or a coil;

the pulse initial current on the control coil of the drive circuit is more than 20% of the average value of the pulse current, so that the capability of overcoming the static friction force during single-step movement of the rotor is improved.

2. The driving method of an electromagnetic motor according to claim 1, wherein the driving circuit generates an internal high voltage which is greater than an external input voltage by 20% or more, and a pulse start current is generated from the internal high voltage.

3. The driving method of an electromagnetic motor according to claim 2, wherein said driving circuit generates a pulse driving current using said external input voltage after said mover starts moving against a static friction force.

4. The driving method of an electromagnetic motor according to claim 2, wherein said driving circuit generates said internal high voltage by means of a charge pump and stores it in a capacitor.

5. The driving method of an electromagnetic motor according to claim 1, wherein the mover is in a stationary state, and the current supplied to the coil by the driving circuit before the pulse current is input may be a positive current, a negative current, or a zero current.

6. The driving method of an electromagnetic motor according to claim 3, wherein the pulse driving current includes a plurality of pieces of currents having different values.