Motor actuator with torque control
First Claim
1. A motor actuator, comprisinga reversible electrical motor having an input from a mainly fixed voltage and having an output, anda drive circuit providing a stop function, when the torque of the motor exceeds a predetermined maximum torque wherein:
- said drive circuit being constructed as a two-terminal circuit having a first terminal connected in series with the output of the reversible electrical motor, and electrical power being supplied to a second terminal with the mainly fixed voltage (Vcc) and a polarity which provides the desired rotational direction of the motor.
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Accused Products
Abstract
In a motor actuator, e.g., a valve actuator, comprising a reversible electrical motor, a drive circuit is providing a stop function, when the torque of the motor exceeds a predetermined maximum torque. The drive circuit is constructed as a two-terminal circuit connected in series with the reversible electrical motor, and the electrical power is supplied to the series connection with a mainly fixed voltage VCC and a polarity which provides the desired rotational direction of the motor. This provides the possibility of having the drive circuit positioned close to the motor and maintaining full torque control and stop function with two wire connections.
95 Citations
19 Claims
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1. A motor actuator, comprising
a reversible electrical motor having an input from a mainly fixed voltage and having an output, and a drive circuit providing a stop function, when the torque of the motor exceeds a predetermined maximum torque wherein: said drive circuit being constructed as a two-terminal circuit having a first terminal connected in series with the output of the reversible electrical motor, and electrical power being supplied to a second terminal with the mainly fixed voltage (Vcc) and a polarity which provides the desired rotational direction of the motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A motor actuator, comprising:
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a reversible electrical motor, said motor having an input terminal receiving current from a supply voltage and having an output terminal; a drive circuit having a first terminal connected in series with the output terminal of said reversible electrical motor and having a second terminal connected to said supply voltage, said drive circuit comprising a rectifier and an output circuit, current in said drive circuit being controlled by said output circuit based on a measurement of a regulated voltage across said drive circuit and a measured current in said drive circuit; a drive control being connected to said output circuit; a current limiter being connected to said drive control, said current limiter setting a maximum current that can be delivered to said motor; a stop circuit being connected to said drive control, said stop circuit being activated when said regulated voltage reaches a predetermined reference voltage; and said drive control cutting off supply of current to said output circuit and therefore to said drive circuit and said motor upon activation of said stop circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification