Magnetic Brake Characteristics; Motor With Magnetic Brakes - Mitsubishi MELDAS HS Series Specifications And Instruction Manual

3-2 Magnetic brake characteristics

CAUTION

3-2-1 Motor with magnetic brakes

(1) Types
The motor with magnetic brakes is set for each motor. The "B" following the standard motor type
indicates the motor with brakes.
(2) Applications
When this type of motor is used for the vertical feed axis in a machining center, etc., slipping and
dropping of the spindle head can be prevented even when the hydraulic balancer's hydraulic
pressure reaches zero when the power turns OFF. When used with a robot, deviation of the
posture when the power is turned OFF can be prevented.
When used for the feed axis of a grinding machine, a double safety measures is formed with the
deceleration stop (dynamic brake stop), and the risks of colliding with the grinding stone and
scattering can be prevented.
This motor cannot be used for purposes other than holding and braking during a power failure
(emergency stop). (This cannot be used for normal deceleration, etc.)
(3) Features
1) The magnetic brakes use a DC excitation method, thus:
• The brake mechanism is simple and the reliability is high.
• There is no need to change the brake tap between 50 Hz and 60 Hz.
• There is no rush current when the excitation occurs, and shock does not occur.
• The brake section is not larger than the motor section.
2) The magnetic brakes are built into the motor, and the installation dimensions are the same as
the motor without brakes.
Chapter 3 Characteristics
1. The axis will not be mechanically held even when the dynamic brakes are
used. If the machine could drop when the power fails, use a servomotor
with magnetic brakes or provide an external brake mechanism as holding
means to prevent dropping.
2. The magnetic brakes are used for holding, and must not be used for normal
braking. There may be cases when holding is not possible due to the life or
machine structure (when ball screw and servomotor are coupled with a
timing belt, etc.). Provide a stop device on the machine side to ensure
safety. When releasing the brakes, always confirm that the servo is ON
first. Sequence control considering this condition is possible if the amplifier
motor brake control signal (MBR) is used.
3. When operating the brakes, always turn the servo OFF (or ready OFF).
4. When the vertical axis drop prevention function is used, the drop of the
vertical axis during an emergency stop can be suppressed to the minimum.
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