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PDF MSK4364 Data sheet ( Hoja de datos )
| Número de pieza | MSK4364 | |
| Descripción | MOTOR DRIVE POWER HYBRID | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MSK4364 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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ISO 9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
5 AMP, 55V, 3 PHASE
MOSFET BRUSHLESS
MOTOR CONTROLLER
4364
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
55 Volt Motor Supply Voltage
MIL-PRF-38534 QUALIFIED
5 Amp Output Switch Capability
100% Duty Cycle High Side Conduction Capable
Shoot-Through/Cross Conduction Protection
Hall Sensing and Commutation Circuitry on Board
"Real" Four Quadrant Torque Control Capability
Good Accuracy Around the Null Torque Point
Isolated Design for High Voltage Isolation Plus Good Thermal Transfer
60°/ 120º Phasing Selectable
DESCRIPTION:
The MSK 4364 is a complete 3 Phase MOSFET Bridge Brushless Motor Control System in an electrically isolated
hermetic package. The hybrid is capable of 5 amps of output current and 55 volts of DC bus voltage. It has the
normal features for protecting the bridge. Included is all the bridge drive circuitry, hall sensing circuitry, commutation
circuitry and all the current sensing and analog circuitry necessary for closed loop current mode (torque) control.
When PWM'ing, the transistors are modulated in locked anti-phase mode for the tightest control and the most
bandwidth. Provisions for applying different compensation schemes are included. The MSK 4364 has good thermal
conductivity of the MOSFET's due to isolated substrate/package design that allows direct heat sinking of the hybrid
without insulators.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
3 Phase Brushless DC Motor Control
Servo Control
Fin Actuator Control
Gimbal Control
AZ-EL Control
1
Rev. A 1/02
1 page  
APPLICATION NOTES CONTINUED
BUS VOLTAGE FILTER CAPACITORS
The size and placement of the capacitors for the DC bus has a direct bearing on the amount of noise filtered and also on the size
and duration of the voltage spikes seen by the bridge. What is being created is a series RLC tuned circuit with a resonant
frequency that is seen as a damped ringing every time one of the transistors switches. For the resistance, wire resistance, power
supply impedance and capacitor ESR all add up for the equivalent lumped resistance in the circuit. The inductance can be figured
at about 30 nH per inch from the power supply. Any voltage spikes are on top of the bus voltage and the back EMF from the
motor. All this must be taken into account when designing and laying out the system. If everything has been minimized, there is
another solution. A second capacitance between 5 and 10 times the first capacitor and it should either have some ESR or a
resistor can be added in series with the second capacitor to help damp the voltage spikes.
Be careful of the ripple current in all the capacitors. Excessive ripple current, beyond what the capacitors can handle, will
destroy the capacitors.
±15VIN FILTER CAPACITORS
It is recommended that about 10 µF of capacitance (tantalum electrolytic) for bypassing the + and -15V inputs be placed as close
to the module pins as practical. Adding ceramic bypass capacitors of about 0.1 µF or 1 µF will aid in suppressing noise transients.
GENERAL LAYOUT
Good PC layout techniques are important. Ground planes for the analog circuitry must be used and should be tied back to the
small signal grounds, pins 11 and 13. The high power grounds (RTN) pins 19 and 20 get tied back to the small signal ground
internally. DO NOT connect these grounds externally. A ground loop will result.
LOW POWER STARTUP
When starting up a system utilizing the MSK 4364 for the first time, there are a few things to keep in mind. First, because of the
small size of the module, short circuiting the output phases either to ground or the DC bus will destroy the bridge. The current
limiting and control only works for current actually flowing through the bridge. The current sense resistor has to see the current
in order for the electronics to control it. If possible, for startup use a lower voltage and lower current power supply to test out
connections and the low current stability. With a limited current supply, even if the controller locks up, the dissipation will be
limited. By observing the E/A OUT pin which is the error amp output, much can be found out about the health and stability of the
system. An even waveform with some rounded triangle wave should be observed. As current goes up, the DC component of the
waveform should move up or down. At full current (with a regular supply) the waveform should not exceed +4 volts positive
peak, or -4 volts negative peak. Some audible noise will be heard which will be the commutation frequency. If the motor squeals,
there is instability and power should be removed immediately unless power dissipation isn't excessive due to limited supply
current. For compensation calculations, refer to the block diagram for all information to determine the amplifier gain for loop gain
calculations. For the power up sequence, ±15 volts should be powered at the same time or before the V+ voltage is applied.
5 Rev. A 1/02
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MSK4364.PDF ] | |
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