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参数资料
| 型号： | APEK4979GLP-01-T-DK |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 37/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL MOTOR CONTROL A4979 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电机控制，步进控制器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | A4979 |
| 已供物品： | 板 |
| 其它名称： | 620-1468 |
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A4979
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
Starting at the top, panel (a) in figure A1, the current is flowing
down through the phase A winding from top to bottom and there
is no current in phase B. The result is an N magnetic pole on the
A electromagnets and an S pole on the A-bar electromagnets. The
rotor position is such that that the poles of the permanent magnets
align with the poles of the electromagnets, N to S.
In the next panel, panel (b), the current is flowing down through
the phase B winding from top to bottom and there is no current
in phase A. The result is an N pole on the B electromagnets and
an S pole on the B-bar electromagnets. These magnetic poles will
attract and repel the permanent magnets on the rotor producing a
force that moves the rotor from left to right in the diagram until
the poles of the permanent magnets again align with the poles of
Microstepping
In many applications it is necessary to improve the resolution of
the stepper motor, for more precise positioning control, or simply
to increase the number of steps per revolution to reduce the
torque ripple and therefore the vibration and noise of the motor.
Fortunately this can be achieved by driving both phases at the
same time in order to move the rotor to a position between two
electromagnets. This is known generically as microstepping.
Figure A2 shows the basic principle of microstepping. Panels (a)
and (c) of figure A2 correspond to panels (a) and (b) of figure
A1. Panel (b) shows each phase energized such that there are now
the electromagnets.
In panel (c), the current is flowing up through the phase A wind-
ing from bottom to top and there is no current in phase B. This
A
B
Stator
_
A
_
B
A
reverses the pole orientation from the top panel, such that there
is an S pole on the A electromagnets and an N pole on the A-bar
electromagnets. As before, these magnetic poles will attract and
N
S
S
N
N
S
A
B
(a) Same as
figure A1(a)
repel the permanent magnets on the rotor producing a force that
moves the rotor from left to right in the diagram, until poles of
the permanent magnets again align with the poles of the electro-
N
S
Rotor
N
magnets.
The bottom panel, panel (d), shows the final combination with
current flowing up through the phase B winding from bottom to
A
B
Stator
_
A
_
B
A
top and there is no current in phase A. This produces an N pole
on the B electromagnets and a S pole on the B-bar electromag-
N
N
S
S
N
A
B
(b) Half-step
position
nets. As before, these magnetic poles will attract and repel the
S
N
S
permanent magnets on the rotor producing a force that moves the
rotor from left to right until poles of the permanent magnets again
align with the poles of the electromagnets.
N
S
Rotor
N
Each of the four steps in figure A1 represents a single full
mechanical step of the stepper motor. The four steps together
represent a single electrical cycle.
A
B
Stator
_
A
_
B
A
The step resolution depends entirely on the mechanical construc-
tion of the motor and typically there will be 200 or more full
steps per mechanical revolution of the motor. A 200-step motor
N
N
S
S
N
A
B
(c) Same as
figure A1(b)
will provide a resolution of 360 / 200 = 1.8° of rotation per step.
Stepping in the opposite direction to that described above is sim-
N
S
Rotor
ply a case of changing the step sequence or inverting one of the
phase current directions.
Figure A2. Half step operation
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-3
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| APEK4984SLP-01-T | 功能描述:BOARD EVAL MOTOR CONTROL A4984 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| APEK4984SLP-01-T-DK | 功能描述:A4984 - Power Management, Motor Control, Stepper Evaluation Board 制造商:allegro microsystems, llc 系列:- 零件状态:有效 主要用途:电源管理，电机控制，步进控制器 嵌入式:否 使用的 IC/零件:A4984 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4985SLP-01-T | 功能描述:Board Eval Motor Control A4985 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
| APEK4985SLP-01-T-DK | 功能描述:A4985 - Power Management, Motor Control, Stepper Evaluation Board 制造商:allegro microsystems, llc 系列:- 零件状态:有效 主要用途:电源管理，电机控制，步进控制器 嵌入式:否 使用的 IC/零件:A4985 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4986SLP-01-T | 功能描述:Board Eval Motor Control A4986 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
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