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Summary of drive circuit of brushed DC motor

Time:2024-04-14 Views:166
    So far, a variety of driving methods for brushed DC motors have been introduced. As a summary of this series of articles on the drive circuit of the brushed DC motor, this article is divided into two tables: "The drive circuit of the brushed DC motor and its characteristics" and "the characteristics of the brushed DC motor and its application examples".


The driving circuit of DC brush motor and its characteristics

Circuit name

Possible rotating support

Speed control

advantage

shortcoming

H-bridge

Forward turn, reverse, stop (Hi-Z), brake

Must not

 

 

H bridge +High side voltage linear control

Forward turn, reverse, stop (Hi-Z), brake

Can be

 

· High power consumption

· Large circuit scale when the power transistor uses MOS

BTL amplifier is driven by linear voltage

Forward turn, reverse, brake

Can be

· Bilinear input, support various actions

· High power consumption

· Large circuit scale

· Output high impedance requires a separate circuit

H-bridge circuit PWM drive OS circuit scale is large

Forward turn, reverse, stop (Hi-Z), brake

Can be

· Low power consumption

· Support DC voltage input

· Need PWM circuit structure

· Noise source

BTL amplifier input form

PWM drive

Forward turn, reverse

immobilize

Can be

· Low power consumption

· Bilinear input, support various actions

· Poor linearity

· Output high impedance requires a separate circuit

· Need PWM circuit structure

· Noise source

Single opening

On/off

One-way rotation,

Stop (Hi-Z)

Must not

· Simple circuit

· Di required

· No emergency stop

PWM drive

One-way rotation,

Stop (Hi-Z)

Can be

· Low power consumption

· Diodes are required, and diode heating needs to be considered

· No emergency stop

· Need PWM circuit structure

· Noise source

Half bridge

On/off

One-way rotation,

Stop (Hi-Z)

Must not

· No diode required

· Emergency stop

· Need to consider the control input structure (single input or double input)

· Need to prevent simultaneous conduction

PWM drive

Can

be

· Low power consumption

· No diode required

· Emergency stop

· Need to consider the control input structure (single input or double input)

· Need PWM circuit structure

· Noise source



Characteristics and application examples of brushed DC motor

Characteristics and application examples of brushed DC motor

advantage

shortcoming

· Easy miniaturization and light weight

· Good efficiency

· Low price

· It can be rotated by applying voltage only

· Low voltage drive (1 battery, 1.5V can work)

· Speed is linearly proportional to the applied voltage

· Speed decreases proportional to load

· Large starting torque

· Torque is proportional to current

· Simple structure, only two wires

· The direction of rotation varies depending on the polarity of the power supply

· There are brushes, so the life is short

· Easy to produce noise

· Easy to generate electrical noise

· Poor uniformity

· Requires DC power supply

· High current when overloading

· There may be sparks

· Friction torque loss caused by brush contact.















Application example of brushed DC motor

ODDOptical Disc Drive

DVD/ Blu-ray drive for computer/game console

Blu-ray recorder/player

Pallet: In/out

Inkjet printer

Multifunction printer

Paper feed

Bracket: Print head moving

scanner

PPC (Plain Paper Copier)

Paper feed

Digital camera

Zoom, IRIS [aperture], lens cap

Mobile phones, tablets

vibrator

plaything

Ordinary action

Model and radio control: Drive, direction control

Game console controller: Vibrating motion

Common household appliance

Hair dryer: Blow the air

Shaver: The blade rotates and reciprocates

Toothbrush: Vibration

Refrigerator: Ice box rotating

other

tool

Drives, drills, chainsaws, etc. : Rotation

Automotive electronics

Power window: Switch

Car mirror: switch, Angle adjustment

Door lock: Lock and unlock

Air conditioner damper: change the wind direction

Corner Pole: Up and down action

Headlight: Light direction adjustment

Car navigation: display retraction

other








   
      
      
   
   


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