Summary of drive circuit of brushed DC motor

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

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

ODD（Optical 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