AC08FSM datasheet(138/223 Pages) TECCOR

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AN1003

Application Notes

http://www.teccor.com

AN1003 - 6

+1 972-580-7777

Thyristor Product Catalog

Permanent Magnet Motor Control

Figure AN1003.16 illustrates a circuit for phase controlling a per-

manent magnet (PM) motor. Since PM motors are also genera-

tors, they have characteristics that make them difficult for a

standard triac to commutate properly. Control of a PM motor is

easily accomplished by using an alternistor triac with enhanced

commutating characteristics.

Figure AN1003.16

Circuit for Phase Controlling a Permanent Magnet

Motor

PM motors normally require full-wave DC rectification. Therefore,

the alternistor triac controller should be connected in series with

the AC input side of the rectifier bridge. The possible alternative

of putting an SCR controller in series with the motor on the DC

side of the rectifier bridge can be a challenge when it comes to

timing and delayed turn-on near the end of the half cycle. The

alternistor triac controller shown in Figure AN1003.16 offers a

wide range control so that the alternistror triac can be triggered at

a small conduction angle or low motor speed; the rectifiers and

alternistors should have similar voltage ratings, with all based on

line voltage and actual motor load requirements.

SCR Phase Control

Figure AN1003.17 shows a very simple variable resistance half-

wave circuit. It provides phase retard from essentially zero (SCR

full on) to 90 electrical degrees of the anode voltage wave (SCR

half on). Diode CR1 blocks reverse gate voltage on the negative

half-cycle of anode supply voltage. This protects the reverse gate

junction of sensitive SCRs and keeps power dissipation low for

gate resistors on the negative half cycle. The diode is rated to

block at least the peak value of the AC supply voltage. The retard

angle cannot be extended beyond the 90-degree point because

the trigger circuit supply voltage and the trigger voltage produc-

ing the gate current to fire are in phase. At the peak of the AC

supply voltage, the SCR can still be triggered with the maximum

value of resistance between anode and gate. Since the SCR will

trigger and latch into conduction the first time IGT is reached, its

conduction cannot be delayed beyond 90 electrical degrees with this

circuit.

Figure AN1003.17

Half-wave Control, 0° to 90° Conduction

Figure AN1003.18 shows a half-wave phase control circuit using

an SCR to control a universal motor. This circuit is better than

simple resistance firing circuits because the phase-shifting char-

acteristics of the RC network permit the firing of the SCR beyond

the peak of the impressed voltage, resulting in small conduction

angles and very slow speed.

Figure AN1003.18

Half-wave Motor Control

MTR

115 V ac

Input

1.5 A

3.3 k

250 k

15 k 1/2 W

0.1

µF

400 V

HT-32

Q4006LH4

100

0.1

µF

100 V

0.1

µF

400 V

MT1

MT2

Input

SCR1

2.2 k

CR1

Load

IN4003

IN4004

120 V ac

60 Hz

120 V ac

60 Hz

240 V ac

60 Hz

240 V ac

60 Hz

240 V ac

50Hz

0.8 A

8.5 A

0.8 A

8.5 A

2.5 A

500 k

100 k

1 M

250 k

1 M

1 k

Not

Required

1 k

Not

Required

1 k

EC103B

S2010F1

EC103D

S4010F1

T106D1

SCR1

CR1

Input

Voltage

Load

Current

SCR1

HT-32

3.3 k

Supply

Universal Motor

CR1

Input

Voltage

120 V ac

60 Hz

240 V ac

60 Hz

240 V ac

50 Hz

Load

Current

8 A

6.5 A

150 k

200 k

IN4003

IN4004

S2015L

S4008L

0.1

µF 200 V

0.1

µF 400 V

0.1

µF 400 V

CR1

SCR1

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